From: Andy Polyakov <appro@openssl.org>
Date: Sun, 22 Feb 2015 17:11:28 +0000 (+0100)
Subject: Add ec/asm/ecp_nistz256-sparcv9.pl.
X-Git-Tag: OpenSSL_1_1_0-pre1~1294
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=5557d5f2e27ae8265d0b76227c78f2879d7f80a6;p=oweals%2Fopenssl.git

Add ec/asm/ecp_nistz256-sparcv9.pl.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
---

diff --git a/crypto/ec/Makefile b/crypto/ec/Makefile
index fa2fc4cbb2..423f60bb54 100644
--- a/crypto/ec/Makefile
+++ b/crypto/ec/Makefile
@@ -54,6 +54,9 @@ ecp_nistz256-x86_64.s: asm/ecp_nistz256-x86_64.pl
 ecp_nistz256-avx2.s:   asm/ecp_nistz256-avx2.pl
 	$(PERL) asm/ecp_nistz256-avx2.pl $(PERLASM_SCHEME) > $@
 
+ecp_nistz256-sparcv9.S:	asm/ecp_nistz256-sparcv9.pl
+	$(PERL) asm/ecp_nistz256-sparcv9.pl $(CFLAGS) > $@
+
 ecp_nistz256-%.S:	asm/ecp_nistz256-%.pl;  $(PERL) $< $(PERLASM_SCHEME) $@
 ecp_nistz256-armv4.o:	ecp_nistz256-armv4.S
 ecp_nistz256-armv8.o:	ecp_nistz256-armv8.S
diff --git a/crypto/ec/asm/ecp_nistz256-sparcv9.pl b/crypto/ec/asm/ecp_nistz256-sparcv9.pl
new file mode 100755
index 0000000000..5693b75e5b
--- /dev/null
+++ b/crypto/ec/asm/ecp_nistz256-sparcv9.pl
@@ -0,0 +1,3045 @@
+#!/usr/bin/env perl
+
+# ====================================================================
+# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
+# project. The module is, however, dual licensed under OpenSSL and
+# CRYPTOGAMS licenses depending on where you obtain it. For further
+# details see http://www.openssl.org/~appro/cryptogams/.
+# ====================================================================
+#
+# ECP_NISTZ256 module for SPARCv9.
+#
+# February 2015.
+#
+# Original ECP_NISTZ256 submission targeting x86_64 is detailed in
+# http://eprint.iacr.org/2013/816. In the process of adaptation
+# original .c module was made 32-bit savvy in order to make this
+# implementation possible.
+#
+#			with/without -DECP_NISTZ256_ASM
+# UltraSPARC III	+12-18%
+# SPARC T4		+99-550% (+66-150% on 32-bit Solaris)
+#
+# Ranges denote minimum and maximum improvement coefficients depending
+# on benchmark. Lower coefficients are for ECDSA sign, server-side
+# operation. Keep in mind that +200% means 3x improvement.
+
+$code.=<<___;
+#include "sparc_arch.h"
+
+#define LOCALS	(STACK_BIAS+STACK_FRAME)
+#ifdef	__arch64__
+.register	%g2,#scratch
+.register	%g3,#scratch
+# define STACK64_FRAME	STACK_FRAME
+# define LOCALS64	LOCALS
+#else
+# define STACK64_FRAME	(2047+192)
+# define LOCALS64	STACK64_FRAME
+#endif
+
+.section	".text",#alloc,#execinstr
+___
+########################################################################
+# Convert ecp_nistz256_table.c to layout expected by ecp_nistz_gather_w7
+#
+$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
+open TABLE,"<ecp_nistz256_table.c"		or
+open TABLE,"<${dir}../ecp_nistz256_table.c"	or
+die "failed to open ecp_nistz256_table.c:",$!;
+
+use integer;
+
+foreach(<TABLE>) {
+	s/TOBN\(\s*(0x[0-9a-f]+),\s*(0x[0-9a-f]+)\s*\)/push @arr,hex($2),hex($1)/geo;
+}
+close TABLE;
+
+# See ecp_nistz256_table.c for explanation for why it's 64*16*37.
+# 64*16*37-1 is because $#arr returns last valid index or @arr, not
+# amount of elements.
+die "insane number of elements" if ($#arr != 64*16*37-1);
+
+$code.=<<___;
+.globl	ecp_nistz256_precomputed
+.align	4096
+ecp_nistz256_precomputed:
+___
+########################################################################
+# this conversion smashes P256_POINT_AFFINE by individual bytes with
+# 64 byte interval, similar to
+#	1111222233334444
+#	1234123412341234
+for(1..37) {
+	@tbl = splice(@arr,0,64*16);
+	for($i=0;$i<64;$i++) {
+		undef @line;
+		for($j=0;$j<64;$j++) {
+			push @line,(@tbl[$j*16+$i/4]>>(($i%4)*8))&0xff;
+		}
+		$code.=".byte\t";
+		$code.=join(',',map { sprintf "0x%02x",$_} @line);
+		$code.="\n";
+	}
+}
+
+{{{
+my ($rp,$ap,$bp)=map("%i$_",(0..2));
+my @acc=map("%l$_",(0..7));
+my ($t0,$t1,$t2,$t3,$t4,$t5,$t6,$t7)=(map("%o$_",(0..5)),"%g4","%g5");
+my ($bi,$a0,$mask,$carry)=(map("%i$_",(3..5)),"%g1");
+my ($rp_real,$ap_real)=("%g2","%g3");
+
+$code.=<<___;
+.size	ecp_nistz256_precomputed,.-ecp_nistz256_precomputed
+.align	64
+.LRR:	! 2^512 mod P precomputed for NIST P256 polynomial
+.long	0x00000003, 0x00000000, 0xffffffff, 0xfffffffb
+.long	0xfffffffe, 0xffffffff, 0xfffffffd, 0x00000004
+.Lone:
+.long	1,0,0,0,0,0,0,0
+.asciz	"ECP_NISTZ256 for SPARCv9, CRYPTOGAMS by <appro\@openssl.org>"
+
+! void	ecp_nistz256_to_mont(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_to_mont
+.align	64
+ecp_nistz256_to_mont:
+	save	%sp,-STACK_FRAME,%sp
+	nop
+1:	call	.+8
+	add	%o7,.LRR-1b,$bp
+	call	__ecp_nistz256_mul_mont
+	nop
+	ret
+	restore
+.size	ecp_nistz256_to_mont,.-ecp_nistz256_to_mont
+
+! void	ecp_nistz256_from_mont(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_from_mont
+.align	32
+ecp_nistz256_from_mont:
+	save	%sp,-STACK_FRAME,%sp
+	nop
+1:	call	.+8
+	add	%o7,.Lone-1b,$bp
+	call	__ecp_nistz256_mul_mont
+	nop
+	ret
+	restore
+.size	ecp_nistz256_from_mont,.-ecp_nistz256_from_mont
+
+! void	ecp_nistz256_mul_mont(BN_ULONG %i0[8],const BN_ULONG %i1[8],
+!					      const BN_ULONG %i2[8]);
+.globl	ecp_nistz256_mul_mont
+.align	32
+ecp_nistz256_mul_mont:
+	save	%sp,-STACK_FRAME,%sp
+	nop
+	call	__ecp_nistz256_mul_mont
+	nop
+	ret
+	restore
+.size	ecp_nistz256_mul_mont,.-ecp_nistz256_mul_mont
+
+! void	ecp_nistz256_sqr_mont(BN_ULONG %i0[8],const BN_ULONG %i2[8]);
+.globl	ecp_nistz256_sqr_mont
+.align	32
+ecp_nistz256_sqr_mont:
+	save	%sp,-STACK_FRAME,%sp
+	mov	$ap,$bp
+	call	__ecp_nistz256_mul_mont
+	nop
+	ret
+	restore
+.size	ecp_nistz256_sqr_mont,.-ecp_nistz256_sqr_mont
+___
+
+########################################################################
+# Special thing to keep in mind is that $t0-$t7 hold 64-bit values,
+# while all others are meant to keep 32. "Meant to" means that additions
+# to @acc[0-7] do "contaminate" upper bits, but they are cleared before
+# they can affect outcome (follow 'and' with $mask). Also keep in mind
+# that addition with carry is addition with 32-bit carry, even though
+# CPU is 64-bit. [Addition with 64-bit carry was introduced in T3, see
+# below for VIS3 code paths.]
+
+$code.=<<___;
+.align	32
+__ecp_nistz256_mul_mont:
+	ld	[$bp+0],$bi		! b[0]
+	mov	-1,$mask
+	ld	[$ap+0],$a0
+	srl	$mask,0,$mask		! 0xffffffff
+	ld	[$ap+4],$t1
+	ld	[$ap+8],$t2
+	ld	[$ap+12],$t3
+	ld	[$ap+16],$t4
+	ld	[$ap+20],$t5
+	ld	[$ap+24],$t6
+	ld	[$ap+28],$t7
+	mulx	$a0,$bi,$t0		! a[0-7]*b[0], 64-bit results
+	mulx	$t1,$bi,$t1
+	mulx	$t2,$bi,$t2
+	mulx	$t3,$bi,$t3
+	mulx	$t4,$bi,$t4
+	mulx	$t5,$bi,$t5
+	mulx	$t6,$bi,$t6
+	mulx	$t7,$bi,$t7
+	srlx	$t0,32,@acc[1]		! extract high parts
+	srlx	$t1,32,@acc[2]
+	srlx	$t2,32,@acc[3]
+	srlx	$t3,32,@acc[4]
+	srlx	$t4,32,@acc[5]
+	srlx	$t5,32,@acc[6]
+	srlx	$t6,32,@acc[7]
+	srlx	$t7,32,@acc[0]		! "@acc[8]"
+	mov	0,$carry
+___
+for($i=1;$i<8;$i++) {
+$code.=<<___;
+	addcc	@acc[1],$t1,@acc[1]	! accumulate high parts
+	ld	[$bp+4*$i],$bi		! b[$i]
+	ld	[$ap+4],$t1		! re-load a[1-7]
+	addccc	@acc[2],$t2,@acc[2]
+	addccc	@acc[3],$t3,@acc[3]
+	ld	[$ap+8],$t2
+	ld	[$ap+12],$t3
+	addccc	@acc[4],$t4,@acc[4]
+	addccc	@acc[5],$t5,@acc[5]
+	ld	[$ap+16],$t4
+	ld	[$ap+20],$t5
+	addccc	@acc[6],$t6,@acc[6]
+	addccc	@acc[7],$t7,@acc[7]
+	ld	[$ap+24],$t6
+	ld	[$ap+28],$t7
+	addccc	@acc[0],$carry,@acc[0]	! "@acc[8]"
+	addc	%g0,%g0,$carry
+___
+	# Reduction iteration is normally performed by accumulating
+	# result of multiplication of modulus by "magic" digit [and
+	# omitting least significant word, which is guaranteed to
+	# be 0], but thanks to special form of modulus and "magic"
+	# digit being equal to least significant word, it can be
+	# performed with additions and subtractions alone. Indeed:
+	#
+	#        ffff.0001.0000.0000.0000.ffff.ffff.ffff
+	# *                                         abcd
+	# + xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.abcd
+	#
+	# Now observing that ff..ff*x = (2^n-1)*x = 2^n*x-x, we
+	# rewrite above as:
+	#
+	#   xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.abcd
+	# + abcd.0000.abcd.0000.0000.abcd.0000.0000.0000
+	# -      abcd.0000.0000.0000.0000.0000.0000.abcd
+	#
+	# or marking redundant operations:
+	#
+	#   xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.----
+	# + abcd.0000.abcd.0000.0000.abcd.----.----.----
+	# -      abcd.----.----.----.----.----.----.----
+
+$code.=<<___;
+	! multiplication-less reduction
+	addcc	@acc[3],$t0,@acc[3]	! r[3]+=r[0]
+	addccc	@acc[4],%g0,@acc[4]	! r[4]+=0
+	 and	@acc[1],$mask,@acc[1]
+	 and	@acc[2],$mask,@acc[2]
+	addccc	@acc[5],%g0,@acc[5]	! r[5]+=0
+	addccc	@acc[6],$t0,@acc[6]	! r[6]+=r[0]
+	 and	@acc[3],$mask,@acc[3]
+	 and	@acc[4],$mask,@acc[4]
+	addccc	@acc[7],%g0,@acc[7]	! r[7]+=0
+	addccc	@acc[0],$t0,@acc[0]	! r[8]+=r[0]	"@acc[8]"
+	 and	@acc[5],$mask,@acc[5]
+	 and	@acc[6],$mask,@acc[6]
+	addc	$carry,%g0,$carry	! top-most carry
+	subcc	@acc[7],$t0,@acc[7]	! r[7]-=r[0]
+	subccc	@acc[0],%g0,@acc[0]	! r[8]-=0	"@acc[8]"
+	subc	$carry,%g0,$carry	! top-most carry
+	 and	@acc[7],$mask,@acc[7]
+	 and	@acc[0],$mask,@acc[0]	! "@acc[8]"
+___
+	push(@acc,shift(@acc));		# rotate registers to "omit" acc[0]
+$code.=<<___;
+	mulx	$a0,$bi,$t0		! a[0-7]*b[$i], 64-bit results
+	mulx	$t1,$bi,$t1
+	mulx	$t2,$bi,$t2
+	mulx	$t3,$bi,$t3
+	mulx	$t4,$bi,$t4
+	mulx	$t5,$bi,$t5
+	mulx	$t6,$bi,$t6
+	mulx	$t7,$bi,$t7
+	add	@acc[0],$t0,$t0		! accumulate low parts, can't overflow
+	add	@acc[1],$t1,$t1
+	srlx	$t0,32,@acc[1]		! extract high parts
+	add	@acc[2],$t2,$t2
+	srlx	$t1,32,@acc[2]
+	add	@acc[3],$t3,$t3
+	srlx	$t2,32,@acc[3]
+	add	@acc[4],$t4,$t4
+	srlx	$t3,32,@acc[4]
+	add	@acc[5],$t5,$t5
+	srlx	$t4,32,@acc[5]
+	add	@acc[6],$t6,$t6
+	srlx	$t5,32,@acc[6]
+	add	@acc[7],$t7,$t7
+	srlx	$t6,32,@acc[7]
+	srlx	$t7,32,@acc[0]		! "@acc[8]"
+___
+}
+$code.=<<___;
+	addcc	@acc[1],$t1,@acc[1]	! accumulate high parts
+	addccc	@acc[2],$t2,@acc[2]
+	addccc	@acc[3],$t3,@acc[3]
+	addccc	@acc[4],$t4,@acc[4]
+	addccc	@acc[5],$t5,@acc[5]
+	addccc	@acc[6],$t6,@acc[6]
+	addccc	@acc[7],$t7,@acc[7]
+	addccc	@acc[0],$carry,@acc[0]	! "@acc[8]"
+	addc	%g0,%g0,$carry
+
+	addcc	@acc[3],$t0,@acc[3]	! multiplication-less reduction
+	addccc	@acc[4],%g0,@acc[4]
+	addccc	@acc[5],%g0,@acc[5]
+	addccc	@acc[6],$t0,@acc[6]
+	addccc	@acc[7],%g0,@acc[7]
+	addccc	@acc[0],$t0,@acc[0]	! "@acc[8]"
+	addc	$carry,%g0,$carry
+	subcc	@acc[7],$t0,@acc[7]
+	subccc	@acc[0],%g0,@acc[0]	! "@acc[8]"
+	subc	$carry,%g0,$carry	! top-most carry
+___
+	push(@acc,shift(@acc));		# rotate registers to omit acc[0]
+$code.=<<___;
+	! Final step is "if result > mod, subtract mod", but we do it
+	! "other way around", namely subtract modulus from result
+	! and if it borrowed, add modulus back.
+
+	subcc	@acc[0],-1,@acc[0]	! subtract modulus
+	subccc	@acc[1],-1,@acc[1]
+	subccc	@acc[2],-1,@acc[2]
+	subccc	@acc[3],0,@acc[3]
+	subccc	@acc[4],0,@acc[4]
+	subccc	@acc[5],0,@acc[5]
+	subccc	@acc[6],1,@acc[6]
+	subccc	@acc[7],-1,@acc[7]
+	subc	$carry,0,$carry		! broadcast borrow bit
+
+	! Note that because mod has special form, i.e. consists of
+	! 0xffffffff, 1 and 0s, we can conditionally synthesize it by
+	! using value of broadcasted borrow and the borrow bit itself.
+	! To minimize dependency chain we first broadcast and then
+	! extract the bit by negating (follow $bi).
+
+	addcc	@acc[0],$carry,@acc[0]	! add modulus or zero
+	addccc	@acc[1],$carry,@acc[1]
+	neg	$carry,$bi
+	st	@acc[0],[$rp]
+	addccc	@acc[2],$carry,@acc[2]
+	st	@acc[1],[$rp+4]
+	addccc	@acc[3],0,@acc[3]
+	st	@acc[2],[$rp+8]
+	addccc	@acc[4],0,@acc[4]
+	st	@acc[3],[$rp+12]
+	addccc	@acc[5],0,@acc[5]
+	st	@acc[4],[$rp+16]
+	addccc	@acc[6],$bi,@acc[6]
+	st	@acc[5],[$rp+20]
+	addc	@acc[7],$carry,@acc[7]
+	st	@acc[6],[$rp+24]
+	retl
+	st	@acc[7],[$rp+28]
+.size	__ecp_nistz256_mul_mont,.-__ecp_nistz256_mul_mont
+
+! void	ecp_nistz256_add(BN_ULONG %i0[8],const BN_ULONG %i1[8],
+!					 const BN_ULONG %i2[8]);
+.globl	ecp_nistz256_add
+.align	32
+ecp_nistz256_add:
+	save	%sp,-STACK_FRAME,%sp
+	ld	[$ap],@acc[0]
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	call	__ecp_nistz256_add
+	ld	[$ap+28],@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_add,.-ecp_nistz256_add
+
+.align	32
+__ecp_nistz256_add:
+	ld	[$bp+0],$t0		! b[0]
+	ld	[$bp+4],$t1
+	ld	[$bp+8],$t2
+	ld	[$bp+12],$t3
+	addcc	@acc[0],$t0,@acc[0]
+	ld	[$bp+16],$t4
+	ld	[$bp+20],$t5
+	addccc	@acc[1],$t1,@acc[1]
+	ld	[$bp+24],$t6
+	ld	[$bp+28],$t7
+	addccc	@acc[2],$t2,@acc[2]
+	addccc	@acc[3],$t3,@acc[3]
+	addccc	@acc[4],$t4,@acc[4]
+	addccc	@acc[5],$t5,@acc[5]
+	addccc	@acc[6],$t6,@acc[6]
+	addccc	@acc[7],$t7,@acc[7]
+	subc	%g0,%g0,$carry		! broadcast carry bit
+
+.Lreduce_by_sub:
+
+	! if a+b carries, subtract modulus.
+	!
+	! Note that because mod has special form, i.e. consists of
+	! 0xffffffff, 1 and 0s, we can conditionally synthesize it by
+	! using value of broadcasted borrow and the borrow bit itself.
+	! To minimize dependency chain we first broadcast and then
+	! extract the bit by negating (follow $bi).
+
+	subcc	@acc[0],$carry,@acc[0]	! subtract synthesized modulus
+	subccc	@acc[1],$carry,@acc[1]
+	neg	$carry,$bi
+	st	@acc[0],[$rp]
+	subccc	@acc[2],$carry,@acc[2]
+	st	@acc[1],[$rp+4]
+	subccc	@acc[3],0,@acc[3]
+	st	@acc[2],[$rp+8]
+	subccc	@acc[4],0,@acc[4]
+	st	@acc[3],[$rp+12]
+	subccc	@acc[5],0,@acc[5]
+	st	@acc[4],[$rp+16]
+	subccc	@acc[6],$bi,@acc[6]
+	st	@acc[5],[$rp+20]
+	subc	@acc[7],$carry,@acc[7]
+	st	@acc[6],[$rp+24]
+	retl
+	st	@acc[7],[$rp+28]
+.size	__ecp_nistz256_add,.-__ecp_nistz256_add
+
+! void	ecp_nistz256_mul_by_2(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_mul_by_2
+.align	32
+ecp_nistz256_mul_by_2:
+	save	%sp,-STACK_FRAME,%sp
+	ld	[$ap],@acc[0]
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	call	__ecp_nistz256_mul_by_2
+	ld	[$ap+28],@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_mul_by_2,.-ecp_nistz256_mul_by_2
+
+.align	32
+__ecp_nistz256_mul_by_2:
+	addcc	@acc[0],@acc[0],@acc[0]	! a+a=2*a
+	addccc	@acc[1],@acc[1],@acc[1]
+	addccc	@acc[2],@acc[2],@acc[2]
+	addccc	@acc[3],@acc[3],@acc[3]
+	addccc	@acc[4],@acc[4],@acc[4]
+	addccc	@acc[5],@acc[5],@acc[5]
+	addccc	@acc[6],@acc[6],@acc[6]
+	addccc	@acc[7],@acc[7],@acc[7]
+	b	.Lreduce_by_sub
+	subc	%g0,%g0,$carry		! broadcast carry bit
+.size	__ecp_nistz256_mul_by_2,.-__ecp_nistz256_mul_by_2
+
+! void	ecp_nistz256_mul_by_3(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_mul_by_3
+.align	32
+ecp_nistz256_mul_by_3:
+	save	%sp,-STACK_FRAME,%sp
+	ld	[$ap],@acc[0]
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	call	__ecp_nistz256_mul_by_3
+	ld	[$ap+28],@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_mul_by_3,.-ecp_nistz256_mul_by_3
+
+.align	32
+__ecp_nistz256_mul_by_3:
+	addcc	@acc[0],@acc[0],$t0	! a+a=2*a
+	addccc	@acc[1],@acc[1],$t1
+	addccc	@acc[2],@acc[2],$t2
+	addccc	@acc[3],@acc[3],$t3
+	addccc	@acc[4],@acc[4],$t4
+	addccc	@acc[5],@acc[5],$t5
+	addccc	@acc[6],@acc[6],$t6
+	addccc	@acc[7],@acc[7],$t7
+	subc	%g0,%g0,$carry		! broadcast carry bit
+
+	subcc	$t0,$carry,$t0		! .Lreduce_by_sub but without stores
+	neg	$carry,$bi
+	subccc	$t1,$carry,$t1
+	subccc	$t2,$carry,$t2
+	subccc	$t3,0,$t3
+	subccc	$t4,0,$t4
+	subccc	$t5,0,$t5
+	subccc	$t6,$bi,$t6
+	subc	$t7,$carry,$t7
+
+	addcc	$t0,@acc[0],@acc[0]	! 2*a+a=3*a
+	addccc	$t1,@acc[1],@acc[1]
+	addccc	$t2,@acc[2],@acc[2]
+	addccc	$t3,@acc[3],@acc[3]
+	addccc	$t4,@acc[4],@acc[4]
+	addccc	$t5,@acc[5],@acc[5]
+	addccc	$t6,@acc[6],@acc[6]
+	addccc	$t7,@acc[7],@acc[7]
+	b	.Lreduce_by_sub
+	subc	%g0,%g0,$carry		! broadcast carry bit
+.size	__ecp_nistz256_mul_by_3,.-__ecp_nistz256_mul_by_3
+
+! void	ecp_nistz256_sub(BN_ULONG %i0[8],const BN_ULONG %i1[8],
+!				         const BN_ULONG %i2[8]);
+.globl	ecp_nistz256_sub
+.align	32
+ecp_nistz256_sub:
+	save	%sp,-STACK_FRAME,%sp
+	ld	[$ap],@acc[0]
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	call	__ecp_nistz256_sub_from
+	ld	[$ap+28],@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_sub,.-ecp_nistz256_sub
+
+! void	ecp_nistz256_neg(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_neg
+.align	32
+ecp_nistz256_neg:
+	save	%sp,-STACK_FRAME,%sp
+	mov	$ap,$bp
+	mov	0,@acc[0]
+	mov	0,@acc[1]
+	mov	0,@acc[2]
+	mov	0,@acc[3]
+	mov	0,@acc[4]
+	mov	0,@acc[5]
+	mov	0,@acc[6]
+	call	__ecp_nistz256_sub_from
+	mov	0,@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_neg,.-ecp_nistz256_neg
+
+.align	32
+__ecp_nistz256_sub_from:
+	ld	[$bp+0],$t0		! b[0]
+	ld	[$bp+4],$t1
+	ld	[$bp+8],$t2
+	ld	[$bp+12],$t3
+	subcc	@acc[0],$t0,@acc[0]
+	ld	[$bp+16],$t4
+	ld	[$bp+20],$t5
+	subccc	@acc[1],$t1,@acc[1]
+	subccc	@acc[2],$t2,@acc[2]
+	ld	[$bp+24],$t6
+	ld	[$bp+28],$t7
+	subccc	@acc[3],$t3,@acc[3]
+	subccc	@acc[4],$t4,@acc[4]
+	subccc	@acc[5],$t5,@acc[5]
+	subccc	@acc[6],$t6,@acc[6]
+	subccc	@acc[7],$t7,@acc[7]
+	subc	%g0,%g0,$carry		! broadcast borrow bit
+
+.Lreduce_by_add:
+
+	! if a-b borrows, add modulus.
+	!
+	! Note that because mod has special form, i.e. consists of
+	! 0xffffffff, 1 and 0s, we can conditionally synthesize it by
+	! using value of broadcasted borrow and the borrow bit itself.
+	! To minimize dependency chain we first broadcast and then
+	! extract the bit by negating (follow $bi).
+
+	addcc	@acc[0],$carry,@acc[0]	! add synthesized modulus
+	addccc	@acc[1],$carry,@acc[1]
+	neg	$carry,$bi
+	st	@acc[0],[$rp]
+	addccc	@acc[2],$carry,@acc[2]
+	st	@acc[1],[$rp+4]
+	addccc	@acc[3],0,@acc[3]
+	st	@acc[2],[$rp+8]
+	addccc	@acc[4],0,@acc[4]
+	st	@acc[3],[$rp+12]
+	addccc	@acc[5],0,@acc[5]
+	st	@acc[4],[$rp+16]
+	addccc	@acc[6],$bi,@acc[6]
+	st	@acc[5],[$rp+20]
+	addc	@acc[7],$carry,@acc[7]
+	st	@acc[6],[$rp+24]
+	retl
+	st	@acc[7],[$rp+28]
+.size	__ecp_nistz256_sub_from,.-__ecp_nistz256_sub_from
+
+.align	32
+__ecp_nistz256_sub_morf:
+	ld	[$bp+0],$t0		! b[0]
+	ld	[$bp+4],$t1
+	ld	[$bp+8],$t2
+	ld	[$bp+12],$t3
+	subcc	$t0,@acc[0],@acc[0]
+	ld	[$bp+16],$t4
+	ld	[$bp+20],$t5
+	subccc	$t1,@acc[1],@acc[1]
+	subccc	$t2,@acc[2],@acc[2]
+	ld	[$bp+24],$t6
+	ld	[$bp+28],$t7
+	subccc	$t3,@acc[3],@acc[3]
+	subccc	$t4,@acc[4],@acc[4]
+	subccc	$t5,@acc[5],@acc[5]
+	subccc	$t6,@acc[6],@acc[6]
+	subccc	$t7,@acc[7],@acc[7]
+	b	.Lreduce_by_add
+	subc	%g0,%g0,$carry		! broadcast borrow bit
+.size	__ecp_nistz256_sub_morf,.-__ecp_nistz256_sub_morf
+
+! void	ecp_nistz256_div_by_2(BN_ULONG %i0[8],const BN_ULONG %i1[8]);
+.globl	ecp_nistz256_div_by_2
+.align	32
+ecp_nistz256_div_by_2:
+	save	%sp,-STACK_FRAME,%sp
+	ld	[$ap],@acc[0]
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	call	__ecp_nistz256_div_by_2
+	ld	[$ap+28],@acc[7]
+	ret
+	restore
+.size	ecp_nistz256_div_by_2,.-ecp_nistz256_div_by_2
+
+.align	32
+__ecp_nistz256_div_by_2:
+	! ret = (a is odd ? a+mod : a) >> 1
+
+	and	@acc[0],1,$bi
+	neg	$bi,$carry
+	addcc	@acc[0],$carry,@acc[0]
+	addccc	@acc[1],$carry,@acc[1]
+	addccc	@acc[2],$carry,@acc[2]
+	addccc	@acc[3],0,@acc[3]
+	addccc	@acc[4],0,@acc[4]
+	addccc	@acc[5],0,@acc[5]
+	addccc	@acc[6],$bi,@acc[6]
+	addccc	@acc[7],$carry,@acc[7]
+	addc	%g0,%g0,$carry
+
+	! ret >>= 1
+
+	srl	@acc[0],1,@acc[0]
+	sll	@acc[1],31,$t0
+	srl	@acc[1],1,@acc[1]
+	or	@acc[0],$t0,@acc[0]
+	sll	@acc[2],31,$t1
+	srl	@acc[2],1,@acc[2]
+	or	@acc[1],$t1,@acc[1]
+	sll	@acc[3],31,$t2
+	st	@acc[0],[$rp]
+	srl	@acc[3],1,@acc[3]
+	or	@acc[2],$t2,@acc[2]
+	sll	@acc[4],31,$t3
+	st	@acc[1],[$rp+4]
+	srl	@acc[4],1,@acc[4]
+	or	@acc[3],$t3,@acc[3]
+	sll	@acc[5],31,$t4
+	st	@acc[2],[$rp+8]
+	srl	@acc[5],1,@acc[5]
+	or	@acc[4],$t4,@acc[4]
+	sll	@acc[6],31,$t5
+	st	@acc[3],[$rp+12]
+	srl	@acc[6],1,@acc[6]
+	or	@acc[5],$t5,@acc[5]
+	sll	@acc[7],31,$t6
+	st	@acc[4],[$rp+16]
+	srl	@acc[7],1,@acc[7]
+	or	@acc[6],$t6,@acc[6]
+	sll	$carry,31,$t7
+	st	@acc[5],[$rp+20]
+	or	@acc[7],$t7,@acc[7]
+	st	@acc[6],[$rp+24]
+	retl
+	st	@acc[7],[$rp+28]
+.size	__ecp_nistz256_div_by_2,.-__ecp_nistz256_div_by_2
+___
+
+########################################################################
+# following subroutines are "literal" implemetation of those found in
+# ecp_nistz256.c
+#
+########################################################################
+# void ecp_nistz256_point_double(P256_POINT *out,const P256_POINT *inp);
+#
+{
+my ($S,$M,$Zsqr,$tmp0)=map(32*$_,(0..3));
+# above map() describes stack layout with 4 temporary
+# 256-bit vectors on top.
+
+$code.=<<___;
+#ifdef __PIC__
+SPARC_PIC_THUNK(%g1)
+#endif
+
+.globl	ecp_nistz256_point_double
+.align	32
+ecp_nistz256_point_double:
+	SPARC_LOAD_ADDRESS_LEAF(OPENSSL_sparcv9cap_P,%g1,%g5)
+	ld	[%g1],%g1		! OPENSSL_sparcv9cap_P[0]
+	and	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK),%g1
+	cmp	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK)
+	be	ecp_nistz256_point_double_vis3
+	nop
+
+	save	%sp,-STACK_FRAME-32*4,%sp
+
+	mov	$rp,$rp_real
+	mov	$ap,$ap_real
+
+	ld	[$ap+32],@acc[0]
+	ld	[$ap+32+4],@acc[1]
+	ld	[$ap+32+8],@acc[2]
+	ld	[$ap+32+12],@acc[3]
+	ld	[$ap+32+16],@acc[4]
+	ld	[$ap+32+20],@acc[5]
+	ld	[$ap+32+24],@acc[6]
+	ld	[$ap+32+28],@acc[7]
+	call	__ecp_nistz256_mul_by_2	! p256_mul_by_2(S, in_y);
+	add	%sp,LOCALS+$S,$rp
+
+	add	$ap_real,64,$bp
+	add	$ap_real,64,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Zsqr, in_z);
+	add	%sp,LOCALS+$Zsqr,$rp
+
+	add	$ap_real,0,$bp
+	call	__ecp_nistz256_add	! p256_add(M, Zsqr, in_x);
+	add	%sp,LOCALS+$M,$rp
+
+	add	%sp,LOCALS+$S,$bp
+	add	%sp,LOCALS+$S,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(S, S);
+	add	%sp,LOCALS+$S,$rp
+
+	ld	[$ap_real],@acc[0]
+	add	%sp,LOCALS+$Zsqr,$bp
+	ld	[$ap_real+4],@acc[1]
+	ld	[$ap_real+8],@acc[2]
+	ld	[$ap_real+12],@acc[3]
+	ld	[$ap_real+16],@acc[4]
+	ld	[$ap_real+20],@acc[5]
+	ld	[$ap_real+24],@acc[6]
+	ld	[$ap_real+28],@acc[7]
+	call	__ecp_nistz256_sub_from	! p256_sub(Zsqr, in_x, Zsqr);
+	add	%sp,LOCALS+$Zsqr,$rp
+
+	add	$ap_real,32,$bp
+	add	$ap_real,64,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(tmp0, in_z, in_y);
+	add	%sp,LOCALS+$tmp0,$rp
+
+	call	__ecp_nistz256_mul_by_2	! p256_mul_by_2(res_z, tmp0);
+	add	$rp_real,64,$rp
+
+	add	%sp,LOCALS+$Zsqr,$bp
+	add	%sp,LOCALS+$M,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(M, M, Zsqr);
+	add	%sp,LOCALS+$M,$rp
+
+	call	__ecp_nistz256_mul_by_3	! p256_mul_by_3(M, M);
+	add	%sp,LOCALS+$M,$rp
+
+	add	%sp,LOCALS+$S,$bp
+	add	%sp,LOCALS+$S,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(tmp0, S);
+	add	%sp,LOCALS+$tmp0,$rp
+
+	call	__ecp_nistz256_div_by_2	! p256_div_by_2(res_y, tmp0);
+	add	$rp_real,32,$rp
+
+	add	$ap_real,0,$bp
+	add	%sp,LOCALS+$S,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S, S, in_x);
+	add	%sp,LOCALS+$S,$rp
+
+	call	__ecp_nistz256_mul_by_2	! p256_mul_by_2(tmp0, S);
+	add	%sp,LOCALS+$tmp0,$rp
+
+	add	%sp,LOCALS+$M,$bp
+	add	%sp,LOCALS+$M,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(res_x, M);
+	add	$rp_real,0,$rp
+
+	add	%sp,LOCALS+$tmp0,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(res_x, res_x, tmp0);
+	add	$rp_real,0,$rp
+
+	add	%sp,LOCALS+$S,$bp
+	call	__ecp_nistz256_sub_morf	! p256_sub(S, S, res_x);
+	add	%sp,LOCALS+$S,$rp
+
+	add	%sp,LOCALS+$M,$bp
+	add	%sp,LOCALS+$S,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S, S, M);
+	add	%sp,LOCALS+$S,$rp
+
+	add	$rp_real,32,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(res_y, S, res_y);
+	add	$rp_real,32,$rp
+
+	ret
+	restore
+.size	ecp_nistz256_point_double,.-ecp_nistz256_point_double
+___
+}
+
+########################################################################
+# void ecp_nistz256_point_add(P256_POINT *out,const P256_POINT *in1,
+#			      const P256_POINT *in2);
+{
+my ($res_x,$res_y,$res_z,
+    $H,$Hsqr,$R,$Rsqr,$Hcub,
+    $U1,$U2,$S1,$S2)=map(32*$_,(0..11));
+my ($Z1sqr, $Z2sqr) = ($Hsqr, $Rsqr);
+
+# above map() describes stack layout with 12 temporary
+# 256-bit vectors on top. Then we reserve some space for
+# !in1infty, !in2infty, result of check for zero and return pointer.
+
+my $bp_real=$rp_real;
+
+$code.=<<___;
+.globl	ecp_nistz256_point_add
+.align	32
+ecp_nistz256_point_add:
+	SPARC_LOAD_ADDRESS_LEAF(OPENSSL_sparcv9cap_P,%g1,%g5)
+	ld	[%g1],%g1		! OPENSSL_sparcv9cap_P[0]
+	and	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK),%g1
+	cmp	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK)
+	be	ecp_nistz256_point_add_vis3
+	nop
+
+	save	%sp,-STACK_FRAME-32*12-32,%sp
+
+	stx	$rp,[%fp+STACK_BIAS-8]	! off-load $rp
+	mov	$ap,$ap_real
+	mov	$bp,$bp_real
+
+	ld	[$bp],@acc[0]		! in2_x
+	ld	[$bp+4],@acc[1]
+	ld	[$bp+8],@acc[2]
+	ld	[$bp+12],@acc[3]
+	ld	[$bp+16],@acc[4]
+	ld	[$bp+20],@acc[5]
+	ld	[$bp+24],@acc[6]
+	ld	[$bp+28],@acc[7]
+	ld	[$bp+32],$t0		! in2_y
+	ld	[$bp+32+4],$t1
+	ld	[$bp+32+8],$t2
+	ld	[$bp+32+12],$t3
+	ld	[$bp+32+16],$t4
+	ld	[$bp+32+20],$t5
+	ld	[$bp+32+24],$t6
+	ld	[$bp+32+28],$t7
+	or	@acc[1],@acc[0],@acc[0]
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	or	@acc[4],@acc[0],@acc[0]
+	or	$t1,$t0,$t0
+	or	$t3,$t2,$t2
+	or	$t5,$t4,$t4
+	or	$t7,$t6,$t6
+	or	$t2,$t0,$t0
+	or	$t6,$t4,$t4
+	or	$t4,$t0,$t0
+	or	@acc[0],$t0,$t0		! !in2infty
+	movrnz	$t0,-1,$t0
+	st	$t0,[%fp+STACK_BIAS-12]
+
+	ld	[$ap],@acc[0]		! in1_x
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	ld	[$ap+28],@acc[7]
+	ld	[$ap+32],$t0		! in1_y
+	ld	[$ap+32+4],$t1
+	ld	[$ap+32+8],$t2
+	ld	[$ap+32+12],$t3
+	ld	[$ap+32+16],$t4
+	ld	[$ap+32+20],$t5
+	ld	[$ap+32+24],$t6
+	ld	[$ap+32+28],$t7
+	or	@acc[1],@acc[0],@acc[0]
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	or	@acc[4],@acc[0],@acc[0]
+	or	$t1,$t0,$t0
+	or	$t3,$t2,$t2
+	or	$t5,$t4,$t4
+	or	$t7,$t6,$t6
+	or	$t2,$t0,$t0
+	or	$t6,$t4,$t4
+	or	$t4,$t0,$t0
+	or	@acc[0],$t0,$t0		! !in1infty
+	movrnz	$t0,-1,$t0
+	st	$t0,[%fp+STACK_BIAS-16]
+
+	add	$bp_real,64,$bp
+	add	$bp_real,64,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Z2sqr, in2_z);
+	add	%sp,LOCALS+$Z2sqr,$rp
+
+	add	$ap_real,64,$bp
+	add	$ap_real,64,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Z1sqr, in1_z);
+	add	%sp,LOCALS+$Z1sqr,$rp
+
+	add	$bp_real,64,$bp
+	add	%sp,LOCALS+$Z2sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S1, Z2sqr, in2_z);
+	add	%sp,LOCALS+$S1,$rp
+
+	add	$ap_real,64,$bp
+	add	%sp,LOCALS+$Z1sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, Z1sqr, in1_z);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	$ap_real,32,$bp
+	add	%sp,LOCALS+$S1,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S1, S1, in1_y);
+	add	%sp,LOCALS+$S1,$rp
+
+	add	$bp_real,32,$bp
+	add	%sp,LOCALS+$S2,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, S2, in2_y);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	%sp,LOCALS+$S1,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(R, S2, S1);
+	add	%sp,LOCALS+$R,$rp
+
+	or	@acc[1],@acc[0],@acc[0]	! see if result is zero
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	or	@acc[4],@acc[0],@acc[0]
+	st	@acc[0],[%fp+STACK_BIAS-20]
+
+	add	$ap_real,0,$bp
+	add	%sp,LOCALS+$Z2sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(U1, in1_x, Z2sqr);
+	add	%sp,LOCALS+$U1,$rp
+
+	add	$bp_real,0,$bp
+	add	%sp,LOCALS+$Z1sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(U2, in2_x, Z1sqr);
+	add	%sp,LOCALS+$U2,$rp
+
+	add	%sp,LOCALS+$U1,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(H, U2, U1);
+	add	%sp,LOCALS+$H,$rp
+
+	or	@acc[1],@acc[0],@acc[0]	! see if result is zero
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	orcc	@acc[4],@acc[0],@acc[0]
+
+	bne,pt	%icc,.Ladd_proceed	! is_equal(U1,U2)?
+	nop
+
+	ld	[%fp+STACK_BIAS-12],$t0
+	ld	[%fp+STACK_BIAS-16],$t1
+	ld	[%fp+STACK_BIAS-20],$t2
+	andcc	$t0,$t1,%g0
+	be,pt	%icc,.Ladd_proceed	! (in1infty || in2infty)?
+	nop
+	andcc	$t2,$t2,%g0
+	be,pt	%icc,.Ladd_proceed	! is_equal(S1,S2)?
+	nop
+
+	ldx	[%fp+STACK_BIAS-8],$rp
+	st	%g0,[$rp]
+	st	%g0,[$rp+4]
+	st	%g0,[$rp+8]
+	st	%g0,[$rp+12]
+	st	%g0,[$rp+16]
+	st	%g0,[$rp+20]
+	st	%g0,[$rp+24]
+	st	%g0,[$rp+28]
+	st	%g0,[$rp+32]
+	st	%g0,[$rp+32+4]
+	st	%g0,[$rp+32+8]
+	st	%g0,[$rp+32+12]
+	st	%g0,[$rp+32+16]
+	st	%g0,[$rp+32+20]
+	st	%g0,[$rp+32+24]
+	st	%g0,[$rp+32+28]
+	st	%g0,[$rp+64]
+	st	%g0,[$rp+64+4]
+	st	%g0,[$rp+64+8]
+	st	%g0,[$rp+64+12]
+	st	%g0,[$rp+64+16]
+	st	%g0,[$rp+64+20]
+	st	%g0,[$rp+64+24]
+	st	%g0,[$rp+64+28]
+	b	.Ladd_done
+	nop
+
+.align	16
+.Ladd_proceed:
+	add	%sp,LOCALS+$R,$bp
+	add	%sp,LOCALS+$R,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Rsqr, R);
+	add	%sp,LOCALS+$Rsqr,$rp
+
+	add	$ap_real,64,$bp
+	add	%sp,LOCALS+$H,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(res_z, H, in1_z);
+	add	%sp,LOCALS+$res_z,$rp
+
+	add	%sp,LOCALS+$H,$bp
+	add	%sp,LOCALS+$H,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Hsqr, H);
+	add	%sp,LOCALS+$Hsqr,$rp
+
+	add	$bp_real,64,$bp
+	add	%sp,LOCALS+$res_z,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(res_z, res_z, in2_z);
+	add	%sp,LOCALS+$res_z,$rp
+
+	add	%sp,LOCALS+$H,$bp
+	add	%sp,LOCALS+$Hsqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(Hcub, Hsqr, H);
+	add	%sp,LOCALS+$Hcub,$rp
+
+	add	%sp,LOCALS+$U1,$bp
+	add	%sp,LOCALS+$Hsqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(U2, U1, Hsqr);
+	add	%sp,LOCALS+$U2,$rp
+
+	call	__ecp_nistz256_mul_by_2	! p256_mul_by_2(Hsqr, U2);
+	add	%sp,LOCALS+$Hsqr,$rp
+
+	add	%sp,LOCALS+$Rsqr,$bp
+	call	__ecp_nistz256_sub_morf	! p256_sub(res_x, Rsqr, Hsqr);
+	add	%sp,LOCALS+$res_x,$rp
+
+	add	%sp,LOCALS+$Hcub,$bp
+	call	__ecp_nistz256_sub_from	!  p256_sub(res_x, res_x, Hcub);
+	add	%sp,LOCALS+$res_x,$rp
+
+	add	%sp,LOCALS+$U2,$bp
+	call	__ecp_nistz256_sub_morf	! p256_sub(res_y, U2, res_x);
+	add	%sp,LOCALS+$res_y,$rp
+
+	add	%sp,LOCALS+$Hcub,$bp
+	add	%sp,LOCALS+$S1,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, S1, Hcub);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	%sp,LOCALS+$R,$bp
+	add	%sp,LOCALS+$res_y,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(res_y, res_y, R);
+	add	%sp,LOCALS+$res_y,$rp
+
+	add	%sp,LOCALS+$S2,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(res_y, res_y, S2);
+	add	%sp,LOCALS+$res_y,$rp
+
+	ld	[%fp+STACK_BIAS-16],$t1	! !in1infty
+	ld	[%fp+STACK_BIAS-12],$t2	! !in2infty
+	ldx	[%fp+STACK_BIAS-8],$rp
+___
+for($i=0;$i<96;$i+=8) {			# conditional moves
+$code.=<<___;
+	ld	[%sp+LOCALS+$i],@acc[0]		! res
+	ld	[%sp+LOCALS+$i+4],@acc[1]
+	ld	[$bp_real+$i],@acc[2]		! in2
+	ld	[$bp_real+$i+4],@acc[3]
+	ld	[$ap_real+$i],@acc[4]		! in1
+	ld	[$ap_real+$i+4],@acc[5]
+	movrz	$t1,@acc[2],@acc[0]
+	movrz	$t1,@acc[3],@acc[1]
+	movrz	$t2,@acc[4],@acc[0]
+	movrz	$t2,@acc[5],@acc[1]
+	st	@acc[0],[$rp+$i]
+	st	@acc[1],[$rp+$i+4]
+___
+}
+$code.=<<___;
+.Ladd_done:
+	ret
+	restore
+.size	ecp_nistz256_point_add,.-ecp_nistz256_point_add
+___
+}
+
+########################################################################
+# void ecp_nistz256_point_add_affine(P256_POINT *out,const P256_POINT *in1,
+#				     const P256_POINT_AFFINE *in2);
+{
+my ($res_x,$res_y,$res_z,
+    $U2,$S2,$H,$R,$Hsqr,$Hcub,$Rsqr)=map(32*$_,(0..9));
+my $Z1sqr = $S2;
+# above map() describes stack layout with 10 temporary
+# 256-bit vectors on top. Then we reserve some space for
+# !in1infty, !in2infty, result of check for zero and return pointer.
+
+my @ONE_mont=(1,0,0,-1,-1,-1,-2,0);
+my $bp_real=$rp_real;
+
+$code.=<<___;
+.globl	ecp_nistz256_point_add_affine
+.align	32
+ecp_nistz256_point_add_affine:
+	SPARC_LOAD_ADDRESS_LEAF(OPENSSL_sparcv9cap_P,%g1,%g5)
+	ld	[%g1],%g1		! OPENSSL_sparcv9cap_P[0]
+	and	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK),%g1
+	cmp	%g1,(SPARCV9_VIS3|SPARCV9_64BIT_STACK)
+	be	ecp_nistz256_point_add_affine_vis3
+	nop
+
+	save	%sp,-STACK_FRAME-32*10-32,%sp
+
+	stx	$rp,[%fp+STACK_BIAS-8]	! off-load $rp
+	mov	$ap,$ap_real
+	mov	$bp,$bp_real
+
+	ld	[$ap],@acc[0]		! in1_x
+	ld	[$ap+4],@acc[1]
+	ld	[$ap+8],@acc[2]
+	ld	[$ap+12],@acc[3]
+	ld	[$ap+16],@acc[4]
+	ld	[$ap+20],@acc[5]
+	ld	[$ap+24],@acc[6]
+	ld	[$ap+28],@acc[7]
+	ld	[$ap+32],$t0		! in1_y
+	ld	[$ap+32+4],$t1
+	ld	[$ap+32+8],$t2
+	ld	[$ap+32+12],$t3
+	ld	[$ap+32+16],$t4
+	ld	[$ap+32+20],$t5
+	ld	[$ap+32+24],$t6
+	ld	[$ap+32+28],$t7
+	or	@acc[1],@acc[0],@acc[0]
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	or	@acc[4],@acc[0],@acc[0]
+	or	$t1,$t0,$t0
+	or	$t3,$t2,$t2
+	or	$t5,$t4,$t4
+	or	$t7,$t6,$t6
+	or	$t2,$t0,$t0
+	or	$t6,$t4,$t4
+	or	$t4,$t0,$t0
+	or	@acc[0],$t0,$t0		! !in1infty
+	movrnz	$t0,-1,$t0
+	st	$t0,[%fp+STACK_BIAS-16]
+
+	ld	[$bp],@acc[0]		! in2_x
+	ld	[$bp+4],@acc[1]
+	ld	[$bp+8],@acc[2]
+	ld	[$bp+12],@acc[3]
+	ld	[$bp+16],@acc[4]
+	ld	[$bp+20],@acc[5]
+	ld	[$bp+24],@acc[6]
+	ld	[$bp+28],@acc[7]
+	ld	[$bp+32],$t0		! in2_y
+	ld	[$bp+32+4],$t1
+	ld	[$bp+32+8],$t2
+	ld	[$bp+32+12],$t3
+	ld	[$bp+32+16],$t4
+	ld	[$bp+32+20],$t5
+	ld	[$bp+32+24],$t6
+	ld	[$bp+32+28],$t7
+	or	@acc[1],@acc[0],@acc[0]
+	or	@acc[3],@acc[2],@acc[2]
+	or	@acc[5],@acc[4],@acc[4]
+	or	@acc[7],@acc[6],@acc[6]
+	or	@acc[2],@acc[0],@acc[0]
+	or	@acc[6],@acc[4],@acc[4]
+	or	@acc[4],@acc[0],@acc[0]
+	or	$t1,$t0,$t0
+	or	$t3,$t2,$t2
+	or	$t5,$t4,$t4
+	or	$t7,$t6,$t6
+	or	$t2,$t0,$t0
+	or	$t6,$t4,$t4
+	or	$t4,$t0,$t0
+	or	@acc[0],$t0,$t0		! !in2infty
+	movrnz	$t0,-1,$t0
+	st	$t0,[%fp+STACK_BIAS-12]
+
+	add	$ap_real,64,$bp
+	add	$ap_real,64,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Z1sqr, in1_z);
+	add	%sp,LOCALS+$Z1sqr,$rp
+
+	add	$bp_real,0,$bp
+	add	%sp,LOCALS+$Z1sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(U2, Z1sqr, in2_x);
+	add	%sp,LOCALS+$U2,$rp
+
+	add	$ap_real,0,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(H, U2, in1_x);
+	add	%sp,LOCALS+$H,$rp
+
+	add	$ap_real,64,$bp
+	add	%sp,LOCALS+$Z1sqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, Z1sqr, in1_z);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	$ap_real,64,$bp
+	add	%sp,LOCALS+$H,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(res_z, H, in1_z);
+	add	%sp,LOCALS+$res_z,$rp
+
+	add	$bp_real,32,$bp
+	add	%sp,LOCALS+$S2,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, S2, in2_y);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	$ap_real,32,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(R, S2, in1_y);
+	add	%sp,LOCALS+$R,$rp
+
+	add	%sp,LOCALS+$H,$bp
+	add	%sp,LOCALS+$H,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Hsqr, H);
+	add	%sp,LOCALS+$Hsqr,$rp
+
+	add	%sp,LOCALS+$R,$bp
+	add	%sp,LOCALS+$R,$ap
+	call	__ecp_nistz256_mul_mont	! p256_sqr_mont(Rsqr, R);
+	add	%sp,LOCALS+$Rsqr,$rp
+
+	add	%sp,LOCALS+$H,$bp
+	add	%sp,LOCALS+$Hsqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(Hcub, Hsqr, H);
+	add	%sp,LOCALS+$Hcub,$rp
+
+	add	$ap_real,0,$bp
+	add	%sp,LOCALS+$Hsqr,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(U2, in1_x, Hsqr);
+	add	%sp,LOCALS+$U2,$rp
+
+	call	__ecp_nistz256_mul_by_2	! p256_mul_by_2(Hsqr, U2);
+	add	%sp,LOCALS+$Hsqr,$rp
+
+	add	%sp,LOCALS+$Rsqr,$bp
+	call	__ecp_nistz256_sub_morf	! p256_sub(res_x, Rsqr, Hsqr);
+	add	%sp,LOCALS+$res_x,$rp
+
+	add	%sp,LOCALS+$Hcub,$bp
+	call	__ecp_nistz256_sub_from	!  p256_sub(res_x, res_x, Hcub);
+	add	%sp,LOCALS+$res_x,$rp
+
+	add	%sp,LOCALS+$U2,$bp
+	call	__ecp_nistz256_sub_morf	! p256_sub(res_y, U2, res_x);
+	add	%sp,LOCALS+$res_y,$rp
+
+	add	$ap_real,32,$bp
+	add	%sp,LOCALS+$Hcub,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(S2, in1_y, Hcub);
+	add	%sp,LOCALS+$S2,$rp
+
+	add	%sp,LOCALS+$R,$bp
+	add	%sp,LOCALS+$res_y,$ap
+	call	__ecp_nistz256_mul_mont	! p256_mul_mont(res_y, res_y, R);
+	add	%sp,LOCALS+$res_y,$rp
+
+	add	%sp,LOCALS+$S2,$bp
+	call	__ecp_nistz256_sub_from	! p256_sub(res_y, res_y, S2);
+	add	%sp,LOCALS+$res_y,$rp
+
+	ld	[%fp+STACK_BIAS-16],$t1	! !in1infty
+	ld	[%fp+STACK_BIAS-12],$t2	! !in2infty
+	ldx	[%fp+STACK_BIAS-8],$rp
+___
+for($i=0;$i<64;$i+=8) {			# conditional moves
+$code.=<<___;
+	ld	[%sp+LOCALS+$i],@acc[0]		! res
+	ld	[%sp+LOCALS+$i+4],@acc[1]
+	ld	[$bp_real+$i],@acc[2]		! in2
+	ld	[$bp_real+$i+4],@acc[3]
+	ld	[$ap_real+$i],@acc[4]		! in1
+	ld	[$ap_real+$i+4],@acc[5]
+	movrz	$t1,@acc[2],@acc[0]
+	movrz	$t1,@acc[3],@acc[1]
+	movrz	$t2,@acc[4],@acc[0]
+	movrz	$t2,@acc[5],@acc[1]
+	st	@acc[0],[$rp+$i]
+	st	@acc[1],[$rp+$i+4]
+___
+}
+for(;$i<96;$i+=8) {
+my $j=($i-64)/4;
+$code.=<<___;
+	ld	[%sp+LOCALS+$i],@acc[0]		! res
+	ld	[%sp+LOCALS+$i+4],@acc[1]
+	ld	[$ap_real+$i],@acc[4]		! in1
+	ld	[$ap_real+$i+4],@acc[5]
+	movrz	$t1,@ONE_mont[$j],@acc[0]
+	movrz	$t1,@ONE_mont[$j+1],@acc[1]
+	movrz	$t2,@acc[4],@acc[0]
+	movrz	$t2,@acc[5],@acc[1]
+	st	@acc[0],[$rp+$i]
+	st	@acc[1],[$rp+$i+4]
+___
+}
+$code.=<<___;
+	ret
+	restore
+.size	ecp_nistz256_point_add_affine,.-ecp_nistz256_point_add_affine
+___
+}								}}}
+{{{
+my ($out,$inp,$index)=map("%i$_",(0..2));
+my $mask="%o0";
+
+$code.=<<___;
+! void	ecp_nistz256_scatter_w5(void *%i0,const P256_POINT *%i1,
+!					  int %i2);
+.globl	ecp_nistz256_scatter_w5
+.align	32
+ecp_nistz256_scatter_w5:
+	save	%sp,-STACK_FRAME,%sp
+
+	sll	$index,2,$index
+	add	$out,$index,$out
+
+	ld	[$inp],%l0		! X
+	ld	[$inp+4],%l1
+	ld	[$inp+8],%l2
+	ld	[$inp+12],%l3
+	ld	[$inp+16],%l4
+	ld	[$inp+20],%l5
+	ld	[$inp+24],%l6
+	ld	[$inp+28],%l7
+	add	$inp,32,$inp
+	st	%l0,[$out+64*0-4]
+	st	%l1,[$out+64*1-4]
+	st	%l2,[$out+64*2-4]
+	st	%l3,[$out+64*3-4]
+	st	%l4,[$out+64*4-4]
+	st	%l5,[$out+64*5-4]
+	st	%l6,[$out+64*6-4]
+	st	%l7,[$out+64*7-4]
+	add	$out,64*8,$out
+
+	ld	[$inp],%l0		! Y
+	ld	[$inp+4],%l1
+	ld	[$inp+8],%l2
+	ld	[$inp+12],%l3
+	ld	[$inp+16],%l4
+	ld	[$inp+20],%l5
+	ld	[$inp+24],%l6
+	ld	[$inp+28],%l7
+	add	$inp,32,$inp
+	st	%l0,[$out+64*0-4]
+	st	%l1,[$out+64*1-4]
+	st	%l2,[$out+64*2-4]
+	st	%l3,[$out+64*3-4]
+	st	%l4,[$out+64*4-4]
+	st	%l5,[$out+64*5-4]
+	st	%l6,[$out+64*6-4]
+	st	%l7,[$out+64*7-4]
+	add	$out,64*8,$out
+
+	ld	[$inp],%l0		! Z
+	ld	[$inp+4],%l1
+	ld	[$inp+8],%l2
+	ld	[$inp+12],%l3
+	ld	[$inp+16],%l4
+	ld	[$inp+20],%l5
+	ld	[$inp+24],%l6
+	ld	[$inp+28],%l7
+	st	%l0,[$out+64*0-4]
+	st	%l1,[$out+64*1-4]
+	st	%l2,[$out+64*2-4]
+	st	%l3,[$out+64*3-4]
+	st	%l4,[$out+64*4-4]
+	st	%l5,[$out+64*5-4]
+	st	%l6,[$out+64*6-4]
+	st	%l7,[$out+64*7-4]
+
+	ret
+	restore
+.size	ecp_nistz256_scatter_w5,.-ecp_nistz256_scatter_w5
+
+! void	ecp_nistz256_gather_w5(P256_POINT *%i0,const void *%i1,
+!					       int %i2);
+.globl	ecp_nistz256_gather_w5
+.align	32
+ecp_nistz256_gather_w5:
+	save	%sp,-STACK_FRAME,%sp
+
+	neg	$index,$mask
+	srax	$mask,63,$mask
+
+	add	$index,$mask,$index
+	sll	$index,2,$index
+	add	$inp,$index,$inp
+
+	ld	[$inp+64*0],%l0
+	ld	[$inp+64*1],%l1
+	ld	[$inp+64*2],%l2
+	ld	[$inp+64*3],%l3
+	ld	[$inp+64*4],%l4
+	ld	[$inp+64*5],%l5
+	ld	[$inp+64*6],%l6
+	ld	[$inp+64*7],%l7
+	add	$inp,64*8,$inp
+	and	%l0,$mask,%l0
+	and	%l1,$mask,%l1
+	st	%l0,[$out]		! X
+	and	%l2,$mask,%l2
+	st	%l1,[$out+4]
+	and	%l3,$mask,%l3
+	st	%l2,[$out+8]
+	and	%l4,$mask,%l4
+	st	%l3,[$out+12]
+	and	%l5,$mask,%l5
+	st	%l4,[$out+16]
+	and	%l6,$mask,%l6
+	st	%l5,[$out+20]
+	and	%l7,$mask,%l7
+	st	%l6,[$out+24]
+	st	%l7,[$out+28]
+	add	$out,32,$out
+
+	ld	[$inp+64*0],%l0
+	ld	[$inp+64*1],%l1
+	ld	[$inp+64*2],%l2
+	ld	[$inp+64*3],%l3
+	ld	[$inp+64*4],%l4
+	ld	[$inp+64*5],%l5
+	ld	[$inp+64*6],%l6
+	ld	[$inp+64*7],%l7
+	add	$inp,64*8,$inp
+	and	%l0,$mask,%l0
+	and	%l1,$mask,%l1
+	st	%l0,[$out]		! Y
+	and	%l2,$mask,%l2
+	st	%l1,[$out+4]
+	and	%l3,$mask,%l3
+	st	%l2,[$out+8]
+	and	%l4,$mask,%l4
+	st	%l3,[$out+12]
+	and	%l5,$mask,%l5
+	st	%l4,[$out+16]
+	and	%l6,$mask,%l6
+	st	%l5,[$out+20]
+	and	%l7,$mask,%l7
+	st	%l6,[$out+24]
+	st	%l7,[$out+28]
+	add	$out,32,$out
+
+	ld	[$inp+64*0],%l0
+	ld	[$inp+64*1],%l1
+	ld	[$inp+64*2],%l2
+	ld	[$inp+64*3],%l3
+	ld	[$inp+64*4],%l4
+	ld	[$inp+64*5],%l5
+	ld	[$inp+64*6],%l6
+	ld	[$inp+64*7],%l7
+	and	%l0,$mask,%l0
+	and	%l1,$mask,%l1
+	st	%l0,[$out]		! Z
+	and	%l2,$mask,%l2
+	st	%l1,[$out+4]
+	and	%l3,$mask,%l3
+	st	%l2,[$out+8]
+	and	%l4,$mask,%l4
+	st	%l3,[$out+12]
+	and	%l5,$mask,%l5
+	st	%l4,[$out+16]
+	and	%l6,$mask,%l6
+	st	%l5,[$out+20]
+	and	%l7,$mask,%l7
+	st	%l6,[$out+24]
+	st	%l7,[$out+28]
+
+	ret
+	restore
+.size	ecp_nistz256_gather_w5,.-ecp_nistz256_gather_w5
+
+! void	ecp_nistz256_scatter_w7(void *%i0,const P256_POINT_AFFINE *%i1,
+!					  int %i2);
+.globl	ecp_nistz256_scatter_w7
+.align	32
+ecp_nistz256_scatter_w7:
+	save	%sp,-STACK_FRAME,%sp
+	nop
+	add	$out,$index,$out
+	mov	64/4,$index
+.Loop_scatter_w7:
+	ld	[$inp],%l0
+	add	$inp,4,$inp
+	subcc	$index,1,$index
+	stb	%l0,[$out+64*0-1]
+	srl	%l0,8,%l1
+	stb	%l1,[$out+64*1-1]
+	srl	%l0,16,%l2
+	stb	%l2,[$out+64*2-1]
+	srl	%l0,24,%l3
+	stb	%l3,[$out+64*3-1]
+	bne	.Loop_scatter_w7
+	add	$out,64*4,$out
+
+	ret
+	restore
+.size	ecp_nistz256_scatter_w7,.-ecp_nistz256_scatter_w7
+
+! void	ecp_nistz256_gather_w7(P256_POINT_AFFINE *%i0,const void *%i1,
+!						      int %i2);
+.globl	ecp_nistz256_gather_w7
+.align	32
+ecp_nistz256_gather_w7:
+	save	%sp,-STACK_FRAME,%sp
+
+	neg	$index,$mask
+	srax	$mask,63,$mask
+
+	add	$index,$mask,$index
+	add	$inp,$index,$inp
+	mov	64/4,$index
+
+.Loop_gather_w7:
+	ldub	[$inp+64*0],%l0
+	prefetch [$inp+3840+64*0],1
+	subcc	$index,1,$index
+	ldub	[$inp+64*1],%l1
+	prefetch [$inp+3840+64*1],1
+	ldub	[$inp+64*2],%l2
+	prefetch [$inp+3840+64*2],1
+	ldub	[$inp+64*3],%l3
+	prefetch [$inp+3840+64*3],1
+	add	$inp,64*4,$inp
+	sll	%l1,8,%l1
+	sll	%l2,16,%l2
+	or	%l0,%l1,%l0
+	sll	%l3,24,%l3
+	or	%l0,%l2,%l0
+	or	%l0,%l3,%l0
+	and	%l0,$mask,%l0
+	st	%l0,[$out]
+	bne	.Loop_gather_w7
+	add	$out,4,$out
+
+	ret
+	restore
+.size	ecp_nistz256_gather_w7,.-ecp_nistz256_gather_w7
+___
+}}}
+{{{
+########################################################################
+# Following subroutines are VIS3 counterparts of those above that
+# implement ones found in ecp_nistz256.c. Key difference is that they
+# use 128-bit muliplication and addition with 64-bit carry, and in order
+# to do that they perform conversion from uin32_t[8] to uint64_t[4] upon
+# entry and vice versa on return.
+#
+my ($rp,$ap,$bp)=map("%i$_",(0..2));
+my ($t0,$t1,$t2,$t3,$a0,$a1,$a2,$a3)=map("%l$_",(0..7));
+my ($acc0,$acc1,$acc2,$acc3,$acc4,$acc5)=map("%o$_",(0..5));
+my ($bi,$poly1,$poly3,$minus1)=(map("%i$_",(3..5)),"%g1");
+my ($rp_real,$ap_real)=("%g2","%g3");
+my ($acc6,$acc7)=($bp,$bi);	# used in squaring
+
+$code.=<<___;
+.align	32
+__ecp_nistz256_mul_by_2_vis3:
+	addcc	$acc0,$acc0,$acc0
+	addxccc	$acc1,$acc1,$acc1
+	addxccc	$acc2,$acc2,$acc2
+	addxccc	$acc3,$acc3,$acc3
+	b	.Lreduce_by_sub_vis3
+	addxc	%g0,%g0,$acc4		! did it carry?
+.size	__ecp_nistz256_mul_by_2_vis3,.-__ecp_nistz256_mul_by_2_vis3
+
+.align	32
+__ecp_nistz256_add_vis3:
+	ldx	[$bp+0],$t0
+	ldx	[$bp+8],$t1
+	ldx	[$bp+16],$t2
+	ldx	[$bp+24],$t3
+
+__ecp_nistz256_add_noload_vis3:
+
+	addcc	$t0,$acc0,$acc0
+	addxccc	$t1,$acc1,$acc1
+	addxccc	$t2,$acc2,$acc2
+	addxccc	$t3,$acc3,$acc3
+	addxc	%g0,%g0,$acc4		! did it carry?
+
+.Lreduce_by_sub_vis3:
+
+	addcc	$acc0,1,$t0		! add -modulus, i.e. subtract
+	addxccc	$acc1,$poly1,$t1
+	addxccc	$acc2,$minus1,$t2
+	addxc	$acc3,$poly3,$t3
+
+	movrnz	$acc4,$t0,$acc0		! if a+b carried, ret = ret-mod
+	movrnz	$acc4,$t1,$acc1
+	stx	$acc0,[$rp]
+	movrnz	$acc4,$t2,$acc2
+	stx	$acc1,[$rp+8]
+	movrnz	$acc4,$t3,$acc3
+	stx	$acc2,[$rp+16]
+	retl
+	stx	$acc3,[$rp+24]
+.size	__ecp_nistz256_add_vis3,.-__ecp_nistz256_add_vis3
+
+! Trouble with subtraction is that there is no subtraction with 64-bit
+! borrow, only with 32-bit one. For this reason we "decompose" 64-bit
+! $acc0-$acc3 to 32-bit values and pick b[4] in 32-bit pieces. But
+! recall that SPARC is big-endian, which is why you'll observe that
+! b[4] is accessed as 4-0-12-8-20-16-28-24. And prior reduction we
+! "collect" result back to 64-bit $acc0-$acc3.
+.align	32
+__ecp_nistz256_sub_from_vis3:
+	ld	[$bp+4],$t0
+	ld	[$bp+0],$t1
+	ld	[$bp+12],$t2
+	ld	[$bp+8],$t3
+
+	srlx	$acc0,32,$acc4
+	not	$poly1,$poly1
+	srlx	$acc1,32,$acc5
+	subcc	$acc0,$t0,$acc0
+	ld	[$bp+20],$t0
+	subccc	$acc4,$t1,$acc4
+	ld	[$bp+16],$t1
+	subccc	$acc1,$t2,$acc1
+	ld	[$bp+28],$t2
+	and	$acc0,$poly1,$acc0
+	subccc	$acc5,$t3,$acc5
+	ld	[$bp+24],$t3
+	sllx	$acc4,32,$acc4
+	and	$acc1,$poly1,$acc1
+	sllx	$acc5,32,$acc5
+	or	$acc0,$acc4,$acc0
+	srlx	$acc2,32,$acc4
+	or	$acc1,$acc5,$acc1
+	srlx	$acc3,32,$acc5
+	subccc	$acc2,$t0,$acc2
+	subccc	$acc4,$t1,$acc4
+	subccc	$acc3,$t2,$acc3
+	and	$acc2,$poly1,$acc2
+	subccc	$acc5,$t3,$acc5
+	sllx	$acc4,32,$acc4
+	and	$acc3,$poly1,$acc3
+	sllx	$acc5,32,$acc5
+	or	$acc2,$acc4,$acc2
+	subc	%g0,%g0,$acc4		! did it borrow?
+	b	.Lreduce_by_add_vis3
+	or	$acc3,$acc5,$acc3
+.size	__ecp_nistz256_sub_from_vis3,.-__ecp_nistz256_sub_from_vis3
+
+.align	32
+__ecp_nistz256_sub_morf_vis3:
+	ld	[$bp+4],$t0
+	ld	[$bp+0],$t1
+	ld	[$bp+12],$t2
+	ld	[$bp+8],$t3
+
+	srlx	$acc0,32,$acc4
+	not	$poly1,$poly1
+	srlx	$acc1,32,$acc5
+	subcc	$t0,$acc0,$acc0
+	ld	[$bp+20],$t0
+	subccc	$t1,$acc4,$acc4
+	ld	[$bp+16],$t1
+	subccc	$t2,$acc1,$acc1
+	ld	[$bp+28],$t2
+	and	$acc0,$poly1,$acc0
+	subccc	$t3,$acc5,$acc5
+	ld	[$bp+24],$t3
+	sllx	$acc4,32,$acc4
+	and	$acc1,$poly1,$acc1
+	sllx	$acc5,32,$acc5
+	or	$acc0,$acc4,$acc0
+	srlx	$acc2,32,$acc4
+	or	$acc1,$acc5,$acc1
+	srlx	$acc3,32,$acc5
+	subccc	$t0,$acc2,$acc2
+	subccc	$t1,$acc4,$acc4
+	subccc	$t2,$acc3,$acc3
+	and	$acc2,$poly1,$acc2
+	subccc	$t3,$acc5,$acc5
+	sllx	$acc4,32,$acc4
+	and	$acc3,$poly1,$acc3
+	sllx	$acc5,32,$acc5
+	or	$acc2,$acc4,$acc2
+	subc	%g0,%g0,$acc4		! did it borrow?
+	or	$acc3,$acc5,$acc3
+
+.Lreduce_by_add_vis3:
+
+	addcc	$acc0,-1,$t0		! add modulus
+	not	$poly3,$t3
+	addxccc	$acc1,$poly1,$t1
+	not	$poly1,$poly1		! restore $poly1
+	addxccc	$acc2,%g0,$t2
+	addxc	$acc3,$t3,$t3
+
+	movrnz	$acc4,$t0,$acc0		! if a-b borrowed, ret = ret+mod
+	movrnz	$acc4,$t1,$acc1
+	stx	$acc0,[$rp]
+	movrnz	$acc4,$t2,$acc2
+	stx	$acc1,[$rp+8]
+	movrnz	$acc4,$t3,$acc3
+	stx	$acc2,[$rp+16]
+	retl
+	stx	$acc3,[$rp+24]
+.size	__ecp_nistz256_sub_morf_vis3,.-__ecp_nistz256_sub_morf_vis3
+
+.align	32
+__ecp_nistz256_div_by_2_vis3:
+	! ret = (a is odd ? a+mod : a) >> 1
+
+	not	$poly1,$t1
+	not	$poly3,$t3
+	and	$acc0,1,$acc5
+	addcc	$acc0,-1,$t0		! add modulus
+	addxccc	$acc1,$t1,$t1
+	addxccc	$acc2,%g0,$t2
+	addxccc	$acc3,$t3,$t3
+	addxc	%g0,%g0,$acc4		! carry bit
+
+	movrnz	$acc5,$t0,$acc0
+	movrnz	$acc5,$t1,$acc1
+	movrnz	$acc5,$t2,$acc2
+	movrnz	$acc5,$t3,$acc3
+	movrz	$acc5,%g0,$acc4
+
+	! ret >>= 1
+
+	srlx	$acc0,1,$acc0
+	sllx	$acc1,63,$t0
+	srlx	$acc1,1,$acc1
+	or	$acc0,$t0,$acc0
+	sllx	$acc2,63,$t1
+	srlx	$acc2,1,$acc2
+	or	$acc1,$t1,$acc1
+	sllx	$acc3,63,$t2
+	stx	$acc0,[$rp]
+	srlx	$acc3,1,$acc3
+	or	$acc2,$t2,$acc2
+	sllx	$acc4,63,$t3		! don't forget carry bit
+	stx	$acc1,[$rp+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[$rp+16]
+	retl
+	stx	$acc3,[$rp+24]
+.size	__ecp_nistz256_div_by_2_vis3,.-__ecp_nistz256_div_by_2_vis3
+
+! compared to __ecp_nistz256_mul_mont it's almost 4x smaller and
+! 4x faster [on T4]...
+.align	32
+__ecp_nistz256_mul_mont_vis3:
+	mulx	$a0,$bi,$acc0
+	not	$poly3,$poly3		! 0xFFFFFFFF00000001
+	umulxhi	$a0,$bi,$t0
+	mulx	$a1,$bi,$acc1
+	umulxhi	$a1,$bi,$t1
+	mulx	$a2,$bi,$acc2
+	umulxhi	$a2,$bi,$t2
+	mulx	$a3,$bi,$acc3
+	umulxhi	$a3,$bi,$t3
+	ldx	[$bp+8],$bi		! b[1]
+
+	addcc	$acc1,$t0,$acc1		! accumulate high parts of multiplication
+	 sllx	$acc0,32,$t0
+	addxccc	$acc2,$t1,$acc2
+	 srlx	$acc0,32,$t1
+	addxccc	$acc3,$t2,$acc3
+	addxc	%g0,$t3,$acc4
+	mov	0,$acc5
+___
+for($i=1;$i<4;$i++) {
+	# Reduction iteration is normally performed by accumulating
+	# result of multiplication of modulus by "magic" digit [and
+	# omitting least significant word, which is guaranteed to
+	# be 0], but thanks to special form of modulus and "magic"
+	# digit being equal to least significant word, it can be
+	# performed with additions and subtractions alone. Indeed:
+	#
+	#            ffff0001.00000000.0000ffff.ffffffff
+	# *                                     abcdefgh
+	# + xxxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx.abcdefgh
+	#
+	# Now observing that ff..ff*x = (2^n-1)*x = 2^n*x-x, we
+	# rewrite above as:
+	#
+	#   xxxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx.abcdefgh
+	# + abcdefgh.abcdefgh.0000abcd.efgh0000.00000000
+	# - 0000abcd.efgh0000.00000000.00000000.abcdefgh
+	#
+	# or marking redundant operations:
+	#
+	#   xxxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx.--------
+	# + abcdefgh.abcdefgh.0000abcd.efgh0000.--------
+	# - 0000abcd.efgh0000.--------.--------.--------
+	#   ^^^^^^^^ but this word is calculated with umulxhi, because
+	#            there is no subtract with 64-bit borrow:-(
+
+$code.=<<___;
+	sub	$acc0,$t0,$t2		! acc0*0xFFFFFFFF00000001, low part
+	umulxhi	$acc0,$poly3,$t3	! acc0*0xFFFFFFFF00000001, high part
+	addcc	$acc1,$t0,$acc0		! +=acc[0]<<96 and omit acc[0]
+	mulx	$a0,$bi,$t0
+	addxccc	$acc2,$t1,$acc1
+	mulx	$a1,$bi,$t1
+	addxccc	$acc3,$t2,$acc2		! +=acc[0]*0xFFFFFFFF00000001
+	mulx	$a2,$bi,$t2
+	addxccc	$acc4,$t3,$acc3
+	mulx	$a3,$bi,$t3
+	addxc	$acc5,%g0,$acc4
+
+	addcc	$acc0,$t0,$acc0		! accumulate low parts of multiplication
+	umulxhi	$a0,$bi,$t0
+	addxccc	$acc1,$t1,$acc1
+	umulxhi	$a1,$bi,$t1
+	addxccc	$acc2,$t2,$acc2
+	umulxhi	$a2,$bi,$t2
+	addxccc	$acc3,$t3,$acc3
+	umulxhi	$a3,$bi,$t3
+	addxc	$acc4,%g0,$acc4
+___
+$code.=<<___	if ($i<3);
+	ldx	[$bp+8*($i+1)],$bi	! bp[$i+1]
+___
+$code.=<<___;
+	addcc	$acc1,$t0,$acc1		! accumulate high parts of multiplication 
+	 sllx	$acc0,32,$t0
+	addxccc	$acc2,$t1,$acc2
+	 srlx	$acc0,32,$t1
+	addxccc	$acc3,$t2,$acc3
+	addxccc	$acc4,$t3,$acc4
+	addxc	%g0,%g0,$acc5
+___
+}
+$code.=<<___;
+	sub	$acc0,$t0,$t2		! acc0*0xFFFFFFFF00000001, low part
+	umulxhi	$acc0,$poly3,$t3	! acc0*0xFFFFFFFF00000001, high part
+	addcc	$acc1,$t0,$acc0		! +=acc[0]<<96 and omit acc[0]
+	addxccc	$acc2,$t1,$acc1
+	addxccc	$acc3,$t2,$acc2		! +=acc[0]*0xFFFFFFFF00000001
+	addxccc	$acc4,$t3,$acc3
+	b	.Lmul_final_vis3	! see below
+	addxc	$acc5,%g0,$acc4
+.size	__ecp_nistz256_mul_mont_vis3,.-__ecp_nistz256_mul_mont_vis3
+
+! compared to above __ecp_nistz256_mul_mont_vis3 it's 21% less
+! instructions, but only 14% faster [on T4]...
+.align	32
+__ecp_nistz256_sqr_mont_vis3:
+	!  |  |  |  |  |  |a1*a0|  |
+	!  |  |  |  |  |a2*a0|  |  |
+	!  |  |a3*a2|a3*a0|  |  |  |
+	!  |  |  |  |a2*a1|  |  |  |
+	!  |  |  |a3*a1|  |  |  |  |
+	! *|  |  |  |  |  |  |  | 2|
+	! +|a3*a3|a2*a2|a1*a1|a0*a0|
+	!  |--+--+--+--+--+--+--+--|
+	!  |A7|A6|A5|A4|A3|A2|A1|A0|, where Ax is $accx, i.e. follow $accx
+	!
+	!  "can't overflow" below mark carrying into high part of
+	!  multiplication result, which can't overflow, because it
+	!  can never be all ones.
+
+	mulx	$a1,$a0,$acc1		! a[1]*a[0]
+	umulxhi	$a1,$a0,$t1
+	mulx	$a2,$a0,$acc2		! a[2]*a[0]
+	umulxhi	$a2,$a0,$t2
+	mulx	$a3,$a0,$acc3		! a[3]*a[0]
+	umulxhi	$a3,$a0,$acc4
+
+	addcc	$acc2,$t1,$acc2		! accumulate high parts of multiplication
+	mulx	$a2,$a1,$t0		! a[2]*a[1]
+	umulxhi	$a2,$a1,$t1
+	addxccc	$acc3,$t2,$acc3
+	mulx	$a3,$a1,$t2		! a[3]*a[1]
+	umulxhi	$a3,$a1,$t3
+	addxc	$acc4,%g0,$acc4		! can't overflow
+
+	mulx	$a3,$a2,$acc5		! a[3]*a[2]
+	not	$poly3,$poly3		! 0xFFFFFFFF00000001
+	umulxhi	$a3,$a2,$acc6
+
+	addcc	$t2,$t1,$t1		! accumulate high parts of multiplication
+	mulx	$a0,$a0,$acc0		! a[0]*a[0]
+	addxc	$t3,%g0,$t2		! can't overflow
+
+	addcc	$acc3,$t0,$acc3		! accumulate low parts of multiplication
+	umulxhi	$a0,$a0,$a0
+	addxccc	$acc4,$t1,$acc4
+	mulx	$a1,$a1,$t1		! a[1]*a[1]
+	addxccc	$acc5,$t2,$acc5
+	umulxhi	$a1,$a1,$a1
+	addxc	$acc6,%g0,$acc6		! can't overflow
+
+	addcc	$acc1,$acc1,$acc1	! acc[1-6]*=2
+	mulx	$a2,$a2,$t2		! a[2]*a[2]
+	addxccc	$acc2,$acc2,$acc2
+	umulxhi	$a2,$a2,$a2
+	addxccc	$acc3,$acc3,$acc3
+	mulx	$a3,$a3,$t3		! a[3]*a[3]
+	addxccc	$acc4,$acc4,$acc4
+	umulxhi	$a3,$a3,$a3
+	addxccc	$acc5,$acc5,$acc5
+	addxccc	$acc6,$acc6,$acc6
+	addxc	%g0,%g0,$acc7
+
+	addcc	$acc1,$a0,$acc1		! +a[i]*a[i]
+	addxccc	$acc2,$t1,$acc2
+	addxccc	$acc3,$a1,$acc3
+	addxccc	$acc4,$t2,$acc4
+	 sllx	$acc0,32,$t0
+	addxccc	$acc5,$a2,$acc5
+	 srlx	$acc0,32,$t1
+	addxccc	$acc6,$t3,$acc6
+	 sub	$acc0,$t0,$t2		! acc0*0xFFFFFFFF00000001, low part
+	addxc	$acc7,$a3,$acc7
+___
+for($i=0;$i<3;$i++) {			# reductions, see commentary
+					# in multiplication for details
+$code.=<<___;
+	umulxhi	$acc0,$poly3,$t3	! acc0*0xFFFFFFFF00000001, high part
+	addcc	$acc1,$t0,$acc0		! +=acc[0]<<96 and omit acc[0]
+	 sllx	$acc0,32,$t0
+	addxccc	$acc2,$t1,$acc1
+	 srlx	$acc0,32,$t1
+	addxccc	$acc3,$t2,$acc2		! +=acc[0]*0xFFFFFFFF00000001
+	 sub	$acc0,$t0,$t2		! acc0*0xFFFFFFFF00000001, low part
+	addxc	%g0,$t3,$acc3		! cant't overflow
+___
+}
+$code.=<<___;
+	umulxhi	$acc0,$poly3,$t3	! acc0*0xFFFFFFFF00000001, high part
+	addcc	$acc1,$t0,$acc0		! +=acc[0]<<96 and omit acc[0]
+	addxccc	$acc2,$t1,$acc1
+	addxccc	$acc3,$t2,$acc2		! +=acc[0]*0xFFFFFFFF00000001
+	addxc	%g0,$t3,$acc3		! can't overflow
+
+	addcc	$acc0,$acc4,$acc0	! accumulate upper half
+	addxccc	$acc1,$acc5,$acc1
+	addxccc	$acc2,$acc6,$acc2
+	addxccc	$acc3,$acc7,$acc3
+	addxc	%g0,%g0,$acc4
+
+.Lmul_final_vis3:
+
+	! Final step is "if result > mod, subtract mod", but as comparison
+	! means subtraction, we do the subtraction and then copy outcome
+	! if it didn't borrow. But note that as we [have to] replace
+	! subtraction with addition with negative, carry/borrow logic is
+	! inverse.
+
+	addcc	$acc0,1,$t0		! add -modulus, i.e. subtract
+	not	$poly3,$poly3		! restore 0x00000000FFFFFFFE
+	addxccc	$acc1,$poly1,$t1
+	addxccc	$acc2,$minus1,$t2
+	addxccc	$acc3,$poly3,$t3
+	addxccc	$acc4,$minus1,%g0	! did it carry?
+
+	movcs	%xcc,$t0,$acc0
+	movcs	%xcc,$t1,$acc1
+	stx	$acc0,[$rp]
+	movcs	%xcc,$t2,$acc2
+	stx	$acc1,[$rp+8]
+	movcs	%xcc,$t3,$acc3
+	stx	$acc2,[$rp+16]
+	retl
+	stx	$acc3,[$rp+24]
+.size	__ecp_nistz256_sqr_mont_vis3,.-__ecp_nistz256_sqr_mont_vis3
+___
+
+########################################################################
+# void ecp_nistz256_point_double(P256_POINT *out,const P256_POINT *inp);
+#
+{
+my ($res_x,$res_y,$res_z,
+    $in_x,$in_y,$in_z,
+    $S,$M,$Zsqr,$tmp0)=map(32*$_,(0..9));
+# above map() describes stack layout with 10 temporary
+# 256-bit vectors on top.
+
+$code.=<<___;
+.align	32
+ecp_nistz256_point_double_vis3:
+	save	%sp,-STACK64_FRAME-32*10,%sp
+
+	mov	$rp,$rp_real
+	mov	-1,$minus1
+	mov	-2,$poly3
+	sllx	$minus1,32,$poly1		! 0xFFFFFFFF00000000
+	srl	$poly3,0,$poly3			! 0x00000000FFFFFFFE
+
+	! convert input to uint64_t[4]
+	ld	[$ap],$a0			! in_x
+	ld	[$ap+4],$t0
+	ld	[$ap+8],$a1
+	ld	[$ap+12],$t1
+	ld	[$ap+16],$a2
+	ld	[$ap+20],$t2
+	ld	[$ap+24],$a3
+	ld	[$ap+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	ld	[$ap+32],$acc0			! in_y
+	or	$a0,$t0,$a0
+	ld	[$ap+32+4],$t0
+	sllx	$t2,32,$t2
+	ld	[$ap+32+8],$acc1
+	or	$a1,$t1,$a1
+	ld	[$ap+32+12],$t1
+	sllx	$t3,32,$t3
+	ld	[$ap+32+16],$acc2
+	or	$a2,$t2,$a2
+	ld	[$ap+32+20],$t2
+	or	$a3,$t3,$a3
+	ld	[$ap+32+24],$acc3
+	sllx	$t0,32,$t0
+	ld	[$ap+32+28],$t3
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in_x]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in_x+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in_x+16]
+	or	$acc0,$t0,$acc0
+	stx	$a3,[%sp+LOCALS64+$in_x+24]
+	or	$acc1,$t1,$acc1
+	stx	$acc0,[%sp+LOCALS64+$in_y]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in_y+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in_y+16]
+	stx	$acc3,[%sp+LOCALS64+$in_y+24]
+
+	ld	[$ap+64],$a0			! in_z
+	ld	[$ap+64+4],$t0
+	ld	[$ap+64+8],$a1
+	ld	[$ap+64+12],$t1
+	ld	[$ap+64+16],$a2
+	ld	[$ap+64+20],$t2
+	ld	[$ap+64+24],$a3
+	ld	[$ap+64+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	or	$a0,$t0,$a0
+	sllx	$t2,32,$t2
+	or	$a1,$t1,$a1
+	sllx	$t3,32,$t3
+	or	$a2,$t2,$a2
+	or	$a3,$t3,$a3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in_z]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in_z+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in_z+16]
+	stx	$a3,[%sp+LOCALS64+$in_z+24]
+
+	! in_y is still in $acc0-$acc3
+	call	__ecp_nistz256_mul_by_2_vis3	! p256_mul_by_2(S, in_y);
+	add	%sp,LOCALS64+$S,$rp
+
+	! in_z is still in $a0-$a3
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Zsqr, in_z);
+	add	%sp,LOCALS64+$Zsqr,$rp
+
+	mov	$acc0,$a0			! put Zsqr aside
+	mov	$acc1,$a1
+	mov	$acc2,$a2
+	mov	$acc3,$a3
+
+	add	%sp,LOCALS64+$in_x,$bp
+	call	__ecp_nistz256_add_vis3		! p256_add(M, Zsqr, in_x);
+	add	%sp,LOCALS64+$M,$rp
+
+	mov	$a0,$acc0			! restore Zsqr
+	ldx	[%sp+LOCALS64+$S],$a0		! forward load
+	mov	$a1,$acc1
+	ldx	[%sp+LOCALS64+$S+8],$a1
+	mov	$a2,$acc2
+	ldx	[%sp+LOCALS64+$S+16],$a2
+	mov	$a3,$acc3
+	ldx	[%sp+LOCALS64+$S+24],$a3
+
+	add	%sp,LOCALS64+$in_x,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(Zsqr, in_x, Zsqr);
+	add	%sp,LOCALS64+$Zsqr,$rp
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(S, S);
+	add	%sp,LOCALS64+$S,$rp
+
+	ldx	[%sp+LOCALS64+$in_z],$bi
+	ldx	[%sp+LOCALS64+$in_y],$a0
+	ldx	[%sp+LOCALS64+$in_y+8],$a1
+	ldx	[%sp+LOCALS64+$in_y+16],$a2
+	ldx	[%sp+LOCALS64+$in_y+24],$a3
+	add	%sp,LOCALS64+$in_z,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(tmp0, in_z, in_y);
+	add	%sp,LOCALS64+$tmp0,$rp
+
+	ldx	[%sp+LOCALS64+$M],$bi		! forward load
+	ldx	[%sp+LOCALS64+$Zsqr],$a0
+	ldx	[%sp+LOCALS64+$Zsqr+8],$a1
+	ldx	[%sp+LOCALS64+$Zsqr+16],$a2
+	ldx	[%sp+LOCALS64+$Zsqr+24],$a3
+
+	call	__ecp_nistz256_mul_by_2_vis3	! p256_mul_by_2(res_z, tmp0);
+	add	%sp,LOCALS64+$res_z,$rp
+
+	add	%sp,LOCALS64+$M,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(M, M, Zsqr);
+	add	%sp,LOCALS64+$M,$rp
+
+	mov	$acc0,$a0			! put aside M
+	mov	$acc1,$a1
+	mov	$acc2,$a2
+	mov	$acc3,$a3
+	call	__ecp_nistz256_mul_by_2_vis3
+	add	%sp,LOCALS64+$M,$rp
+	mov	$a0,$t0				! copy M
+	ldx	[%sp+LOCALS64+$S],$a0		! forward load
+	mov	$a1,$t1
+	ldx	[%sp+LOCALS64+$S+8],$a1
+	mov	$a2,$t2
+	ldx	[%sp+LOCALS64+$S+16],$a2
+	mov	$a3,$t3
+	ldx	[%sp+LOCALS64+$S+24],$a3
+	call	__ecp_nistz256_add_noload_vis3	! p256_mul_by_3(M, M);
+	add	%sp,LOCALS64+$M,$rp
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(tmp0, S);
+	add	%sp,LOCALS64+$tmp0,$rp
+
+	ldx	[%sp+LOCALS64+$S],$bi		! forward load
+	ldx	[%sp+LOCALS64+$in_x],$a0
+	ldx	[%sp+LOCALS64+$in_x+8],$a1
+	ldx	[%sp+LOCALS64+$in_x+16],$a2
+	ldx	[%sp+LOCALS64+$in_x+24],$a3
+
+	call	__ecp_nistz256_div_by_2_vis3	! p256_div_by_2(res_y, tmp0);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	add	%sp,LOCALS64+$S,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S, S, in_x);
+	add	%sp,LOCALS64+$S,$rp
+
+	ldx	[%sp+LOCALS64+$M],$a0		! forward load
+	ldx	[%sp+LOCALS64+$M+8],$a1
+	ldx	[%sp+LOCALS64+$M+16],$a2
+	ldx	[%sp+LOCALS64+$M+24],$a3
+
+	call	__ecp_nistz256_mul_by_2_vis3	! p256_mul_by_2(tmp0, S);
+	add	%sp,LOCALS64+$tmp0,$rp
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(res_x, M);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	add	%sp,LOCALS64+$tmp0,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(res_x, res_x, tmp0);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	ldx	[%sp+LOCALS64+$M],$a0		! forward load
+	ldx	[%sp+LOCALS64+$M+8],$a1
+	ldx	[%sp+LOCALS64+$M+16],$a2
+	ldx	[%sp+LOCALS64+$M+24],$a3
+
+	add	%sp,LOCALS64+$S,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(S, S, res_x);
+	add	%sp,LOCALS64+$S,$rp
+
+	mov	$acc0,$bi
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S, S, M);
+	add	%sp,LOCALS64+$S,$rp
+
+	ldx	[%sp+LOCALS64+$res_x],$a0	! forward load
+	ldx	[%sp+LOCALS64+$res_x+8],$a1
+	ldx	[%sp+LOCALS64+$res_x+16],$a2
+	ldx	[%sp+LOCALS64+$res_x+24],$a3
+
+	add	%sp,LOCALS64+$res_y,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(res_y, S, res_y);
+	add	%sp,LOCALS64+$res_y,$bp
+
+	! convert output to uint_32[8]
+	srlx	$a0,32,$t0
+	srlx	$a1,32,$t1
+	st	$a0,[$rp_real]			! res_x
+	srlx	$a2,32,$t2
+	st	$t0,[$rp_real+4]
+	srlx	$a3,32,$t3
+	st	$a1,[$rp_real+8]
+	st	$t1,[$rp_real+12]
+	st	$a2,[$rp_real+16]
+	st	$t2,[$rp_real+20]
+	st	$a3,[$rp_real+24]
+	st	$t3,[$rp_real+28]
+
+	ldx	[%sp+LOCALS64+$res_z],$a0	! forward load
+	srlx	$acc0,32,$t0
+	ldx	[%sp+LOCALS64+$res_z+8],$a1
+	srlx	$acc1,32,$t1
+	ldx	[%sp+LOCALS64+$res_z+16],$a2
+	srlx	$acc2,32,$t2
+	ldx	[%sp+LOCALS64+$res_z+24],$a3
+	srlx	$acc3,32,$t3
+	st	$acc0,[$rp_real+32]		! res_y
+	st	$t0,  [$rp_real+32+4]
+	st	$acc1,[$rp_real+32+8]
+	st	$t1,  [$rp_real+32+12]
+	st	$acc2,[$rp_real+32+16]
+	st	$t2,  [$rp_real+32+20]
+	st	$acc3,[$rp_real+32+24]
+	st	$t3,  [$rp_real+32+28]
+
+	srlx	$a0,32,$t0
+	srlx	$a1,32,$t1
+	st	$a0,[$rp_real+64]		! res_z
+	srlx	$a2,32,$t2
+	st	$t0,[$rp_real+64+4]
+	srlx	$a3,32,$t3
+	st	$a1,[$rp_real+64+8]
+	st	$t1,[$rp_real+64+12]
+	st	$a2,[$rp_real+64+16]
+	st	$t2,[$rp_real+64+20]
+	st	$a3,[$rp_real+64+24]
+	st	$t3,[$rp_real+64+28]
+
+	ret
+	restore
+.size	ecp_nistz256_point_double_vis3,.-ecp_nistz256_point_double_vis3
+___
+}
+########################################################################
+# void ecp_nistz256_point_add(P256_POINT *out,const P256_POINT *in1,
+#			      const P256_POINT *in2);
+{
+my ($res_x,$res_y,$res_z,
+    $in1_x,$in1_y,$in1_z,
+    $in2_x,$in2_y,$in2_z,
+    $H,$Hsqr,$R,$Rsqr,$Hcub,
+    $U1,$U2,$S1,$S2)=map(32*$_,(0..17));
+my ($Z1sqr, $Z2sqr) = ($Hsqr, $Rsqr);
+
+# above map() describes stack layout with 18 temporary
+# 256-bit vectors on top. Then we reserve some space for
+# !in1infty, !in2infty and result of check for zero.
+
+$code.=<<___;
+.globl	ecp_nistz256_point_add_vis3
+.align	32
+ecp_nistz256_point_add_vis3:
+	save	%sp,-STACK64_FRAME-32*18-32,%sp
+
+	mov	$rp,$rp_real
+	mov	-1,$minus1
+	mov	-2,$poly3
+	sllx	$minus1,32,$poly1		! 0xFFFFFFFF00000000
+	srl	$poly3,0,$poly3			! 0x00000000FFFFFFFE
+
+	! convert input to uint64_t[4]
+	ld	[$bp],$a0			! in2_x
+	ld	[$bp+4],$t0
+	ld	[$bp+8],$a1
+	ld	[$bp+12],$t1
+	ld	[$bp+16],$a2
+	ld	[$bp+20],$t2
+	ld	[$bp+24],$a3
+	ld	[$bp+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	ld	[$bp+32],$acc0			! in2_y
+	or	$a0,$t0,$a0
+	ld	[$bp+32+4],$t0
+	sllx	$t2,32,$t2
+	ld	[$bp+32+8],$acc1
+	or	$a1,$t1,$a1
+	ld	[$bp+32+12],$t1
+	sllx	$t3,32,$t3
+	ld	[$bp+32+16],$acc2
+	or	$a2,$t2,$a2
+	ld	[$bp+32+20],$t2
+	or	$a3,$t3,$a3
+	ld	[$bp+32+24],$acc3
+	sllx	$t0,32,$t0
+	ld	[$bp+32+28],$t3
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in2_x]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in2_x+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in2_x+16]
+	or	$acc0,$t0,$acc0
+	stx	$a3,[%sp+LOCALS64+$in2_x+24]
+	or	$acc1,$t1,$acc1
+	stx	$acc0,[%sp+LOCALS64+$in2_y]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in2_y+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in2_y+16]
+	stx	$acc3,[%sp+LOCALS64+$in2_y+24]
+
+	or	$a1,$a0,$a0
+	or	$a3,$a2,$a2
+	or	$acc1,$acc0,$acc0
+	or	$acc3,$acc2,$acc2
+	or	$a2,$a0,$a0
+	or	$acc2,$acc0,$acc0
+	or	$acc0,$a0,$a0
+	movrnz	$a0,-1,$a0			! !in2infty
+	stx	$a0,[%fp+STACK_BIAS-8]
+
+	ld	[$bp+64],$acc0			! in2_z
+	ld	[$bp+64+4],$t0
+	ld	[$bp+64+8],$acc1
+	ld	[$bp+64+12],$t1
+	ld	[$bp+64+16],$acc2
+	ld	[$bp+64+20],$t2
+	ld	[$bp+64+24],$acc3
+	ld	[$bp+64+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	ld	[$ap],$a0			! in1_x
+	or	$acc0,$t0,$acc0
+	ld	[$ap+4],$t0
+	sllx	$t2,32,$t2
+	ld	[$ap+8],$a1
+	or	$acc1,$t1,$acc1
+	ld	[$ap+12],$t1
+	sllx	$t3,32,$t3
+	ld	[$ap+16],$a2
+	or	$acc2,$t2,$acc2
+	ld	[$ap+20],$t2
+	or	$acc3,$t3,$acc3
+	ld	[$ap+24],$a3
+	sllx	$t0,32,$t0
+	ld	[$ap+28],$t3
+	sllx	$t1,32,$t1
+	stx	$acc0,[%sp+LOCALS64+$in2_z]
+	sllx	$t2,32,$t2
+	stx	$acc1,[%sp+LOCALS64+$in2_z+8]
+	sllx	$t3,32,$t3
+	stx	$acc2,[%sp+LOCALS64+$in2_z+16]
+	stx	$acc3,[%sp+LOCALS64+$in2_z+24]
+
+	or	$a0,$t0,$a0
+	ld	[$ap+32],$acc0			! in1_y
+	or	$a1,$t1,$a1
+	ld	[$ap+32+4],$t0
+	or	$a2,$t2,$a2
+	ld	[$ap+32+8],$acc1
+	or	$a3,$t3,$a3
+	ld	[$ap+32+12],$t1
+	ld	[$ap+32+16],$acc2
+	ld	[$ap+32+20],$t2
+	ld	[$ap+32+24],$acc3
+	sllx	$t0,32,$t0
+	ld	[$ap+32+28],$t3
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in1_x]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in1_x+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in1_x+16]
+	or	$acc0,$t0,$acc0
+	stx	$a3,[%sp+LOCALS64+$in1_x+24]
+	or	$acc1,$t1,$acc1
+	stx	$acc0,[%sp+LOCALS64+$in1_y]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in1_y+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in1_y+16]
+	stx	$acc3,[%sp+LOCALS64+$in1_y+24]
+
+	or	$a1,$a0,$a0
+	or	$a3,$a2,$a2
+	or	$acc1,$acc0,$acc0
+	or	$acc3,$acc2,$acc2
+	or	$a2,$a0,$a0
+	or	$acc2,$acc0,$acc0
+	or	$acc0,$a0,$a0
+	movrnz	$a0,-1,$a0			! !in1infty
+	stx	$a0,[%fp+STACK_BIAS-16]
+
+	ldx	[%sp+LOCALS64+$in2_z],$a0	! forward load
+	ldx	[%sp+LOCALS64+$in2_z+8],$a1
+	ldx	[%sp+LOCALS64+$in2_z+16],$a2
+	ldx	[%sp+LOCALS64+$in2_z+24],$a3
+
+	ld	[$ap+64],$acc0			! in1_z
+	ld	[$ap+64+4],$t0
+	ld	[$ap+64+8],$acc1
+	ld	[$ap+64+12],$t1
+	ld	[$ap+64+16],$acc2
+	ld	[$ap+64+20],$t2
+	ld	[$ap+64+24],$acc3
+	ld	[$ap+64+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	or	$acc0,$t0,$acc0
+	sllx	$t2,32,$t2
+	or	$acc1,$t1,$acc1
+	sllx	$t3,32,$t3
+	stx	$acc0,[%sp+LOCALS64+$in1_z]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in1_z+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in1_z+16]
+	stx	$acc3,[%sp+LOCALS64+$in1_z+24]
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Z2sqr, in2_z);
+	add	%sp,LOCALS64+$Z2sqr,$rp
+
+	ldx	[%sp+LOCALS64+$in1_z],$a0
+	ldx	[%sp+LOCALS64+$in1_z+8],$a1
+	ldx	[%sp+LOCALS64+$in1_z+16],$a2
+	ldx	[%sp+LOCALS64+$in1_z+24],$a3
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Z1sqr, in1_z);
+	add	%sp,LOCALS64+$Z1sqr,$rp
+
+	ldx	[%sp+LOCALS64+$Z2sqr],$bi
+	ldx	[%sp+LOCALS64+$in2_z],$a0
+	ldx	[%sp+LOCALS64+$in2_z+8],$a1
+	ldx	[%sp+LOCALS64+$in2_z+16],$a2
+	ldx	[%sp+LOCALS64+$in2_z+24],$a3
+	add	%sp,LOCALS64+$Z2sqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S1, Z2sqr, in2_z);
+	add	%sp,LOCALS64+$S1,$rp
+
+	ldx	[%sp+LOCALS64+$Z1sqr],$bi
+	ldx	[%sp+LOCALS64+$in1_z],$a0
+	ldx	[%sp+LOCALS64+$in1_z+8],$a1
+	ldx	[%sp+LOCALS64+$in1_z+16],$a2
+	ldx	[%sp+LOCALS64+$in1_z+24],$a3
+	add	%sp,LOCALS64+$Z1sqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, Z1sqr, in1_z);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$S1],$bi
+	ldx	[%sp+LOCALS64+$in1_y],$a0
+	ldx	[%sp+LOCALS64+$in1_y+8],$a1
+	ldx	[%sp+LOCALS64+$in1_y+16],$a2
+	ldx	[%sp+LOCALS64+$in1_y+24],$a3
+	add	%sp,LOCALS64+$S1,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S1, S1, in1_y);
+	add	%sp,LOCALS64+$S1,$rp
+
+	ldx	[%sp+LOCALS64+$S2],$bi
+	ldx	[%sp+LOCALS64+$in2_y],$a0
+	ldx	[%sp+LOCALS64+$in2_y+8],$a1
+	ldx	[%sp+LOCALS64+$in2_y+16],$a2
+	ldx	[%sp+LOCALS64+$in2_y+24],$a3
+	add	%sp,LOCALS64+$S2,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, S2, in2_y);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$Z2sqr],$bi	! forward load
+	ldx	[%sp+LOCALS64+$in1_x],$a0
+	ldx	[%sp+LOCALS64+$in1_x+8],$a1
+	ldx	[%sp+LOCALS64+$in1_x+16],$a2
+	ldx	[%sp+LOCALS64+$in1_x+24],$a3
+
+	add	%sp,LOCALS64+$S1,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(R, S2, S1);
+	add	%sp,LOCALS64+$R,$rp
+
+	or	$acc1,$acc0,$acc0		! see if result is zero
+	or	$acc3,$acc2,$acc2
+	or	$acc2,$acc0,$acc0
+	stx	$acc0,[%fp+STACK_BIAS-24]
+
+	add	%sp,LOCALS64+$Z2sqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(U1, in1_x, Z2sqr);
+	add	%sp,LOCALS64+$U1,$rp
+
+	ldx	[%sp+LOCALS64+$Z1sqr],$bi
+	ldx	[%sp+LOCALS64+$in2_x],$a0
+	ldx	[%sp+LOCALS64+$in2_x+8],$a1
+	ldx	[%sp+LOCALS64+$in2_x+16],$a2
+	ldx	[%sp+LOCALS64+$in2_x+24],$a3
+	add	%sp,LOCALS64+$Z1sqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(U2, in2_x, Z1sqr);
+	add	%sp,LOCALS64+$U2,$rp
+
+	ldx	[%sp+LOCALS64+$R],$a0		! forward load
+	ldx	[%sp+LOCALS64+$R+8],$a1
+	ldx	[%sp+LOCALS64+$R+16],$a2
+	ldx	[%sp+LOCALS64+$R+24],$a3
+
+	add	%sp,LOCALS64+$U1,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(H, U2, U1);
+	add	%sp,LOCALS64+$H,$rp
+
+	or	$acc1,$acc0,$acc0		! see if result is zero
+	or	$acc3,$acc2,$acc2
+	orcc	$acc2,$acc0,$acc0
+
+	bne,pt	%xcc,.Ladd_proceed_vis3		! is_equal(U1,U2)?
+	nop
+
+	ldx	[%fp+STACK_BIAS-8],$t0
+	ldx	[%fp+STACK_BIAS-16],$t1
+	ldx	[%fp+STACK_BIAS-24],$t2
+	andcc	$t0,$t1,%g0
+	be,pt	%xcc,.Ladd_proceed_vis3		! (in1infty || in2infty)?
+	nop
+	andcc	$t2,$t2,%g0
+	be,pt	%xcc,.Ladd_proceed_vis3		! is_equal(S1,S2)?
+	nop
+
+	st	%g0,[$rp_real]
+	st	%g0,[$rp_real+4]
+	st	%g0,[$rp_real+8]
+	st	%g0,[$rp_real+12]
+	st	%g0,[$rp_real+16]
+	st	%g0,[$rp_real+20]
+	st	%g0,[$rp_real+24]
+	st	%g0,[$rp_real+28]
+	st	%g0,[$rp_real+32]
+	st	%g0,[$rp_real+32+4]
+	st	%g0,[$rp_real+32+8]
+	st	%g0,[$rp_real+32+12]
+	st	%g0,[$rp_real+32+16]
+	st	%g0,[$rp_real+32+20]
+	st	%g0,[$rp_real+32+24]
+	st	%g0,[$rp_real+32+28]
+	st	%g0,[$rp_real+64]
+	st	%g0,[$rp_real+64+4]
+	st	%g0,[$rp_real+64+8]
+	st	%g0,[$rp_real+64+12]
+	st	%g0,[$rp_real+64+16]
+	st	%g0,[$rp_real+64+20]
+	st	%g0,[$rp_real+64+24]
+	st	%g0,[$rp_real+64+28]
+	b	.Ladd_done_vis3
+	nop
+
+.align	16
+.Ladd_proceed_vis3:
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Rsqr, R);
+	add	%sp,LOCALS64+$Rsqr,$rp
+
+	ldx	[%sp+LOCALS64+$H],$bi
+	ldx	[%sp+LOCALS64+$in1_z],$a0
+	ldx	[%sp+LOCALS64+$in1_z+8],$a1
+	ldx	[%sp+LOCALS64+$in1_z+16],$a2
+	ldx	[%sp+LOCALS64+$in1_z+24],$a3
+	add	%sp,LOCALS64+$H,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(res_z, H, in1_z);
+	add	%sp,LOCALS64+$res_z,$rp
+
+	ldx	[%sp+LOCALS64+$H],$a0
+	ldx	[%sp+LOCALS64+$H+8],$a1
+	ldx	[%sp+LOCALS64+$H+16],$a2
+	ldx	[%sp+LOCALS64+$H+24],$a3
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Hsqr, H);
+	add	%sp,LOCALS64+$Hsqr,$rp
+
+	ldx	[%sp+LOCALS64+$res_z],$bi
+	ldx	[%sp+LOCALS64+$in2_z],$a0
+	ldx	[%sp+LOCALS64+$in2_z+8],$a1
+	ldx	[%sp+LOCALS64+$in2_z+16],$a2
+	ldx	[%sp+LOCALS64+$in2_z+24],$a3
+	add	%sp,LOCALS64+$res_z,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(res_z, res_z, in2_z);
+	add	%sp,LOCALS64+$res_z,$rp
+
+	ldx	[%sp+LOCALS64+$H],$bi
+	ldx	[%sp+LOCALS64+$Hsqr],$a0
+	ldx	[%sp+LOCALS64+$Hsqr+8],$a1
+	ldx	[%sp+LOCALS64+$Hsqr+16],$a2
+	ldx	[%sp+LOCALS64+$Hsqr+24],$a3
+	add	%sp,LOCALS64+$H,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(Hcub, Hsqr, H);
+	add	%sp,LOCALS64+$Hcub,$rp
+
+	ldx	[%sp+LOCALS64+$U1],$bi
+	ldx	[%sp+LOCALS64+$Hsqr],$a0
+	ldx	[%sp+LOCALS64+$Hsqr+8],$a1
+	ldx	[%sp+LOCALS64+$Hsqr+16],$a2
+	ldx	[%sp+LOCALS64+$Hsqr+24],$a3
+	add	%sp,LOCALS64+$U1,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(U2, U1, Hsqr);
+	add	%sp,LOCALS64+$U2,$rp
+
+	call	__ecp_nistz256_mul_by_2_vis3	! p256_mul_by_2(Hsqr, U2);
+	add	%sp,LOCALS64+$Hsqr,$rp
+
+	add	%sp,LOCALS64+$Rsqr,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(res_x, Rsqr, Hsqr);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	add	%sp,LOCALS64+$Hcub,$bp
+	call	__ecp_nistz256_sub_from_vis3	!  p256_sub(res_x, res_x, Hcub);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	ldx	[%sp+LOCALS64+$S1],$bi		! forward load
+	ldx	[%sp+LOCALS64+$Hcub],$a0
+	ldx	[%sp+LOCALS64+$Hcub+8],$a1
+	ldx	[%sp+LOCALS64+$Hcub+16],$a2
+	ldx	[%sp+LOCALS64+$Hcub+24],$a3
+
+	add	%sp,LOCALS64+$U2,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(res_y, U2, res_x);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	add	%sp,LOCALS64+$S1,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, S1, Hcub);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$R],$bi
+	ldx	[%sp+LOCALS64+$res_y],$a0
+	ldx	[%sp+LOCALS64+$res_y+8],$a1
+	ldx	[%sp+LOCALS64+$res_y+16],$a2
+	ldx	[%sp+LOCALS64+$res_y+24],$a3
+	add	%sp,LOCALS64+$R,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(res_y, res_y, R);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	add	%sp,LOCALS64+$S2,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(res_y, res_y, S2);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	ldx	[%fp+STACK_BIAS-16],$t1		! !in1infty
+	ldx	[%fp+STACK_BIAS-8],$t2		! !in2infty
+___
+for($i=0;$i<96;$i+=16) {			# conditional moves
+$code.=<<___;
+	ldx	[%sp+LOCALS64+$res_x+$i],$acc0	! res
+	ldx	[%sp+LOCALS64+$res_x+$i+8],$acc1
+	ldx	[%sp+LOCALS64+$in2_x+$i],$acc2	! in2
+	ldx	[%sp+LOCALS64+$in2_x+$i+8],$acc3
+	ldx	[%sp+LOCALS64+$in1_x+$i],$acc4	! in1
+	ldx	[%sp+LOCALS64+$in1_x+$i+8],$acc5
+	movrz	$t1,$acc2,$acc0
+	movrz	$t1,$acc3,$acc1
+	movrz	$t2,$acc4,$acc0
+	movrz	$t2,$acc5,$acc1
+	srlx	$acc0,32,$acc2
+	srlx	$acc1,32,$acc3
+	st	$acc0,[$rp_real+$i]
+	st	$acc2,[$rp_real+$i+4]
+	st	$acc1,[$rp_real+$i+8]
+	st	$acc3,[$rp_real+$i+12]
+___
+}
+$code.=<<___;
+.Ladd_done_vis3:
+	ret
+	restore
+.size	ecp_nistz256_point_add_vis3,.-ecp_nistz256_point_add_vis3
+___
+}
+########################################################################
+# void ecp_nistz256_point_add_affine(P256_POINT *out,const P256_POINT *in1,
+#				     const P256_POINT_AFFINE *in2);
+{
+my ($res_x,$res_y,$res_z,
+    $in1_x,$in1_y,$in1_z,
+    $in2_x,$in2_y,
+    $U2,$S2,$H,$R,$Hsqr,$Hcub,$Rsqr)=map(32*$_,(0..14));
+my $Z1sqr = $S2;
+# above map() describes stack layout with 15 temporary
+# 256-bit vectors on top. Then we reserve some space for
+# !in1infty and !in2infty.
+
+$code.=<<___;
+.align	32
+ecp_nistz256_point_add_affine_vis3:
+	save	%sp,-STACK64_FRAME-32*15-32,%sp
+
+	mov	$rp,$rp_real
+	mov	-1,$minus1
+	mov	-2,$poly3
+	sllx	$minus1,32,$poly1		! 0xFFFFFFFF00000000
+	srl	$poly3,0,$poly3			! 0x00000000FFFFFFFE
+
+	! convert input to uint64_t[4]
+	ld	[$bp],$a0			! in2_x
+	ld	[$bp+4],$t0
+	ld	[$bp+8],$a1
+	ld	[$bp+12],$t1
+	ld	[$bp+16],$a2
+	ld	[$bp+20],$t2
+	ld	[$bp+24],$a3
+	ld	[$bp+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	ld	[$bp+32],$acc0			! in2_y
+	or	$a0,$t0,$a0
+	ld	[$bp+32+4],$t0
+	sllx	$t2,32,$t2
+	ld	[$bp+32+8],$acc1
+	or	$a1,$t1,$a1
+	ld	[$bp+32+12],$t1
+	sllx	$t3,32,$t3
+	ld	[$bp+32+16],$acc2
+	or	$a2,$t2,$a2
+	ld	[$bp+32+20],$t2
+	or	$a3,$t3,$a3
+	ld	[$bp+32+24],$acc3
+	sllx	$t0,32,$t0
+	ld	[$bp+32+28],$t3
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in2_x]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in2_x+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in2_x+16]
+	or	$acc0,$t0,$acc0
+	stx	$a3,[%sp+LOCALS64+$in2_x+24]
+	or	$acc1,$t1,$acc1
+	stx	$acc0,[%sp+LOCALS64+$in2_y]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in2_y+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in2_y+16]
+	stx	$acc3,[%sp+LOCALS64+$in2_y+24]
+
+	or	$a1,$a0,$a0
+	or	$a3,$a2,$a2
+	or	$acc1,$acc0,$acc0
+	or	$acc3,$acc2,$acc2
+	or	$a2,$a0,$a0
+	or	$acc2,$acc0,$acc0
+	or	$acc0,$a0,$a0
+	movrnz	$a0,-1,$a0			! !in2infty
+	stx	$a0,[%fp+STACK_BIAS-8]
+
+	ld	[$ap],$a0			! in1_x
+	ld	[$ap+4],$t0
+	ld	[$ap+8],$a1
+	ld	[$ap+12],$t1
+	ld	[$ap+16],$a2
+	ld	[$ap+20],$t2
+	ld	[$ap+24],$a3
+	ld	[$ap+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	ld	[$ap+32],$acc0			! in1_y
+	or	$a0,$t0,$a0
+	ld	[$ap+32+4],$t0
+	sllx	$t2,32,$t2
+	ld	[$ap+32+8],$acc1
+	or	$a1,$t1,$a1
+	ld	[$ap+32+12],$t1
+	sllx	$t3,32,$t3
+	ld	[$ap+32+16],$acc2
+	or	$a2,$t2,$a2
+	ld	[$ap+32+20],$t2
+	or	$a3,$t3,$a3
+	ld	[$ap+32+24],$acc3
+	sllx	$t0,32,$t0
+	ld	[$ap+32+28],$t3
+	sllx	$t1,32,$t1
+	stx	$a0,[%sp+LOCALS64+$in1_x]
+	sllx	$t2,32,$t2
+	stx	$a1,[%sp+LOCALS64+$in1_x+8]
+	sllx	$t3,32,$t3
+	stx	$a2,[%sp+LOCALS64+$in1_x+16]
+	or	$acc0,$t0,$acc0
+	stx	$a3,[%sp+LOCALS64+$in1_x+24]
+	or	$acc1,$t1,$acc1
+	stx	$acc0,[%sp+LOCALS64+$in1_y]
+	or	$acc2,$t2,$acc2
+	stx	$acc1,[%sp+LOCALS64+$in1_y+8]
+	or	$acc3,$t3,$acc3
+	stx	$acc2,[%sp+LOCALS64+$in1_y+16]
+	stx	$acc3,[%sp+LOCALS64+$in1_y+24]
+
+	or	$a1,$a0,$a0
+	or	$a3,$a2,$a2
+	or	$acc1,$acc0,$acc0
+	or	$acc3,$acc2,$acc2
+	or	$a2,$a0,$a0
+	or	$acc2,$acc0,$acc0
+	or	$acc0,$a0,$a0
+	movrnz	$a0,-1,$a0			! !in1infty
+	stx	$a0,[%fp+STACK_BIAS-16]
+
+	ld	[$ap+64],$a0			! in1_z
+	ld	[$ap+64+4],$t0
+	ld	[$ap+64+8],$a1
+	ld	[$ap+64+12],$t1
+	ld	[$ap+64+16],$a2
+	ld	[$ap+64+20],$t2
+	ld	[$ap+64+24],$a3
+	ld	[$ap+64+28],$t3
+	sllx	$t0,32,$t0
+	sllx	$t1,32,$t1
+	or	$a0,$t0,$a0
+	sllx	$t2,32,$t2
+	or	$a1,$t1,$a1
+	sllx	$t3,32,$t3
+	stx	$a0,[%sp+LOCALS64+$in1_z]
+	or	$a2,$t2,$a2
+	stx	$a1,[%sp+LOCALS64+$in1_z+8]
+	or	$a3,$t3,$a3
+	stx	$a2,[%sp+LOCALS64+$in1_z+16]
+	stx	$a3,[%sp+LOCALS64+$in1_z+24]
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Z1sqr, in1_z);
+	add	%sp,LOCALS64+$Z1sqr,$rp
+
+	ldx	[%sp+LOCALS64+$in2_x],$bi
+	mov	$acc0,$a0
+	mov	$acc1,$a1
+	mov	$acc2,$a2
+	mov	$acc3,$a3
+	add	%sp,LOCALS64+$in2_x,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(U2, Z1sqr, in2_x);
+	add	%sp,LOCALS64+$U2,$rp
+
+	ldx	[%sp+LOCALS64+$Z1sqr],$bi	! forward load
+	ldx	[%sp+LOCALS64+$in1_z],$a0
+	ldx	[%sp+LOCALS64+$in1_z+8],$a1
+	ldx	[%sp+LOCALS64+$in1_z+16],$a2
+	ldx	[%sp+LOCALS64+$in1_z+24],$a3
+
+	add	%sp,LOCALS64+$in1_x,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(H, U2, in1_x);
+	add	%sp,LOCALS64+$H,$rp
+
+	add	%sp,LOCALS64+$Z1sqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, Z1sqr, in1_z);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$H],$bi
+	ldx	[%sp+LOCALS64+$in1_z],$a0
+	ldx	[%sp+LOCALS64+$in1_z+8],$a1
+	ldx	[%sp+LOCALS64+$in1_z+16],$a2
+	ldx	[%sp+LOCALS64+$in1_z+24],$a3
+	add	%sp,LOCALS64+$H,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(res_z, H, in1_z);
+	add	%sp,LOCALS64+$res_z,$rp
+
+	ldx	[%sp+LOCALS64+$S2],$bi
+	ldx	[%sp+LOCALS64+$in2_y],$a0
+	ldx	[%sp+LOCALS64+$in2_y+8],$a1
+	ldx	[%sp+LOCALS64+$in2_y+16],$a2
+	ldx	[%sp+LOCALS64+$in2_y+24],$a3
+	add	%sp,LOCALS64+$S2,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, S2, in2_y);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$H],$a0		! forward load
+	ldx	[%sp+LOCALS64+$H+8],$a1
+	ldx	[%sp+LOCALS64+$H+16],$a2
+	ldx	[%sp+LOCALS64+$H+24],$a3
+
+	add	%sp,LOCALS64+$in1_y,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(R, S2, in1_y);
+	add	%sp,LOCALS64+$R,$rp
+
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Hsqr, H);
+	add	%sp,LOCALS64+$Hsqr,$rp
+
+	ldx	[%sp+LOCALS64+$R],$a0
+	ldx	[%sp+LOCALS64+$R+8],$a1
+	ldx	[%sp+LOCALS64+$R+16],$a2
+	ldx	[%sp+LOCALS64+$R+24],$a3
+	call	__ecp_nistz256_sqr_mont_vis3	! p256_sqr_mont(Rsqr, R);
+	add	%sp,LOCALS64+$Rsqr,$rp
+
+	ldx	[%sp+LOCALS64+$H],$bi
+	ldx	[%sp+LOCALS64+$Hsqr],$a0
+	ldx	[%sp+LOCALS64+$Hsqr+8],$a1
+	ldx	[%sp+LOCALS64+$Hsqr+16],$a2
+	ldx	[%sp+LOCALS64+$Hsqr+24],$a3
+	add	%sp,LOCALS64+$H,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(Hcub, Hsqr, H);
+	add	%sp,LOCALS64+$Hcub,$rp
+
+	ldx	[%sp+LOCALS64+$Hsqr],$bi
+	ldx	[%sp+LOCALS64+$in1_x],$a0
+	ldx	[%sp+LOCALS64+$in1_x+8],$a1
+	ldx	[%sp+LOCALS64+$in1_x+16],$a2
+	ldx	[%sp+LOCALS64+$in1_x+24],$a3
+	add	%sp,LOCALS64+$Hsqr,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(U2, in1_x, Hsqr);
+	add	%sp,LOCALS64+$U2,$rp
+
+	call	__ecp_nistz256_mul_by_2_vis3	! p256_mul_by_2(Hsqr, U2);
+	add	%sp,LOCALS64+$Hsqr,$rp
+
+	add	%sp,LOCALS64+$Rsqr,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(res_x, Rsqr, Hsqr);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	add	%sp,LOCALS64+$Hcub,$bp
+	call	__ecp_nistz256_sub_from_vis3	!  p256_sub(res_x, res_x, Hcub);
+	add	%sp,LOCALS64+$res_x,$rp
+
+	ldx	[%sp+LOCALS64+$Hcub],$bi	! forward load
+	ldx	[%sp+LOCALS64+$in1_y],$a0
+	ldx	[%sp+LOCALS64+$in1_y+8],$a1
+	ldx	[%sp+LOCALS64+$in1_y+16],$a2
+	ldx	[%sp+LOCALS64+$in1_y+24],$a3
+
+	add	%sp,LOCALS64+$U2,$bp
+	call	__ecp_nistz256_sub_morf_vis3	! p256_sub(res_y, U2, res_x);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	add	%sp,LOCALS64+$Hcub,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(S2, in1_y, Hcub);
+	add	%sp,LOCALS64+$S2,$rp
+
+	ldx	[%sp+LOCALS64+$R],$bi
+	ldx	[%sp+LOCALS64+$res_y],$a0
+	ldx	[%sp+LOCALS64+$res_y+8],$a1
+	ldx	[%sp+LOCALS64+$res_y+16],$a2
+	ldx	[%sp+LOCALS64+$res_y+24],$a3
+	add	%sp,LOCALS64+$R,$bp
+	call	__ecp_nistz256_mul_mont_vis3	! p256_mul_mont(res_y, res_y, R);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	add	%sp,LOCALS64+$S2,$bp
+	call	__ecp_nistz256_sub_from_vis3	! p256_sub(res_y, res_y, S2);
+	add	%sp,LOCALS64+$res_y,$rp
+
+	ldx	[%fp+STACK_BIAS-16],$t1		! !in1infty
+	ldx	[%fp+STACK_BIAS-8],$t2		! !in2infty
+1:	call	.+8
+	add	%o7,.Lone_mont_vis3-1b,$bp
+___
+for($i=0;$i<64;$i+=16) {			# conditional moves
+$code.=<<___;
+	ldx	[%sp+LOCALS64+$res_x+$i],$acc0	! res
+	ldx	[%sp+LOCALS64+$res_x+$i+8],$acc1
+	ldx	[%sp+LOCALS64+$in2_x+$i],$acc2	! in2
+	ldx	[%sp+LOCALS64+$in2_x+$i+8],$acc3
+	ldx	[%sp+LOCALS64+$in1_x+$i],$acc4	! in1
+	ldx	[%sp+LOCALS64+$in1_x+$i+8],$acc5
+	movrz	$t1,$acc2,$acc0
+	movrz	$t1,$acc3,$acc1
+	movrz	$t2,$acc4,$acc0
+	movrz	$t2,$acc5,$acc1
+	srlx	$acc0,32,$acc2
+	srlx	$acc1,32,$acc3
+	st	$acc0,[$rp_real+$i]
+	st	$acc2,[$rp_real+$i+4]
+	st	$acc1,[$rp_real+$i+8]
+	st	$acc3,[$rp_real+$i+12]
+___
+}
+for(;$i<96;$i+=16) {
+$code.=<<___;
+	ldx	[%sp+LOCALS64+$res_x+$i],$acc0	! res
+	ldx	[%sp+LOCALS64+$res_x+$i+8],$acc1
+	ldx	[$bp+$i-64],$acc2		! "in2"
+	ldx	[$bp+$i-64+8],$acc3
+	ldx	[%sp+LOCALS64+$in1_x+$i],$acc4	! in1
+	ldx	[%sp+LOCALS64+$in1_x+$i+8],$acc5
+	movrz	$t1,$acc2,$acc0
+	movrz	$t1,$acc3,$acc1
+	movrz	$t2,$acc4,$acc0
+	movrz	$t2,$acc5,$acc1
+	srlx	$acc0,32,$acc2
+	srlx	$acc1,32,$acc3
+	st	$acc0,[$rp_real+$i]
+	st	$acc2,[$rp_real+$i+4]
+	st	$acc1,[$rp_real+$i+8]
+	st	$acc3,[$rp_real+$i+12]
+___
+}
+$code.=<<___;
+	ret
+	restore
+.size	ecp_nistz256_point_add_affine_vis3,.-ecp_nistz256_point_add_affine_vis3
+.align	64
+.Lone_mont_vis3:
+.long	0x00000000,0x00000001, 0xffffffff,0x00000000
+.long	0xffffffff,0xffffffff, 0x00000000,0xfffffffe
+.align	64
+___
+}								}}}
+
+# Purpose of these subroutines is to explicitly encode VIS instructions,
+# so that one can compile the module without having to specify VIS
+# extensions on compiler command line, e.g. -xarch=v9 vs. -xarch=v9a.
+# Idea is to reserve for option to produce "universal" binary and let
+# programmer detect if current CPU is VIS capable at run-time.
+sub unvis3 {
+my ($mnemonic,$rs1,$rs2,$rd)=@_;
+my %bias = ( "g" => 0, "o" => 8, "l" => 16, "i" => 24 );
+my ($ref,$opf);
+my %visopf = (	"addxc"		=> 0x011,
+		"addxccc"	=> 0x013,
+		"umulxhi"	=> 0x016	);
+
+    $ref = "$mnemonic\t$rs1,$rs2,$rd";
+
+    if ($opf=$visopf{$mnemonic}) {
+	foreach ($rs1,$rs2,$rd) {
+	    return $ref if (!/%([goli])([0-9])/);
+	    $_=$bias{$1}+$2;
+	}
+
+	return	sprintf ".word\t0x%08x !%s",
+			0x81b00000|$rd<<25|$rs1<<14|$opf<<5|$rs2,
+			$ref;
+    } else {
+	return $ref;
+    }
+}
+
+foreach (split("\n",$code)) {
+	s/\`([^\`]*)\`/eval $1/ge;
+
+	s/\b(umulxhi|addxc[c]{0,2})\s+(%[goli][0-7]),\s*(%[goli][0-7]),\s*(%[goli][0-7])/
+		&unvis3($1,$2,$3,$4)
+	 /ge;
+
+	print $_,"\n";
+}
+
+close STDOUT;