# respectful 50%. It remains to be seen if loop unrolling and
# dedicated squaring routine can provide further improvement...
+# July 2011.
+#
+# Add dedicated squaring procedure. Performance improvement varies
+# from platform to platform, but in average it's ~5%/15%/25%/33%
+# for 512-/1024-/2048-/4096-bit RSA *sign* benchmarks respectively.
+
$flavour = shift;
$output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
$num="%r9"; # int num);
$lo0="%r10";
$hi0="%r11";
-$bp="%r12"; # reassign $bp
$hi1="%r13";
$i="%r14";
$j="%r15";
.type bn_mul_mont,\@function,6
.align 16
bn_mul_mont:
+ cmp $ap,$bp
+ jne .Lmul_enter
+ test \$1,${num}d
+ jnz .Lmul_enter
+ cmp \$4,${num}d
+ jb .Lmul_enter
+ jmp __bn_sqr_enter
+
+.align 16
+.Lmul_enter:
push %rbx
push %rbp
push %r12
mov %r11,8(%rsp,$num,8) # tp[num+1]=%rsp
.Lprologue:
- mov %rdx,$bp # $bp reassigned, remember?
-
+ mov $bp,%r12 # reassign $bp
+___
+ $bp="%r12";
+$code.=<<___;
mov ($n0),$n0 # pull n0[0] value
xor $i,$i # i=0
mov %rdx,$hi1
lea 1($j),$j # j++
-.align 4
+ jmp .Linner
+.align 16
.Linner:
mov ($ap,$j,8),%rax
mulq $m0 # ap[j]*bp[i]
.Lepilogue:
ret
.size bn_mul_mont,.-bn_mul_mont
+___
+\f{{{
+######################################################################
+# void bn_sqr_mont(
+my $rptr="%rdi"; # const BN_ULONG *rptr,
+my $aptr="%rsi"; # const BN_ULONG *aptr,
+my $bptr="%rdx"; # not used
+my $nptr="%rcx"; # const BN_ULONG *nptr,
+my $n0 ="%r8"; # const BN_ULONG *n0);
+my $num ="%r9"; # int num, has to be even and not less than 4
+
+my ($i,$j,$tptr)=("%rbp","%rcx",$rptr);
+my @A0=("%r10","%r11");
+my @A1=("%r12","%r13");
+my ($a0,$a1,$ai)=("%r14","%r15","%rbx");
+
+$code.=<<___;
+.type bn_sqr_mont,\@function,5
+.align 16
+bn_sqr_mont:
+__bn_sqr_enter:
+ push %rbx
+ push %rbp
+ push %r12
+ push %r13
+ push %r14
+ push %r15
+
+ shl \$3,${num}d # convert $num to bytes
+ xor %r10,%r10
+ mov %rsp,%r11 # put aside %rsp
+ sub $num,%r10 # -$num
+ mov ($n0),$n0 # *n0
+ lea -72(%rsp,%r10,2),%rsp # alloca(frame+2*$num)
+ and \$-1024,%rsp # minimize TLB usage
+ ##############################################################
+ # Stack layout
+ #
+ # +0 saved $num, used in reduction section
+ # +8 &t[2*$num], used in reduction section
+ # +32 saved $rptr
+ # +40 saved $nptr
+ # +48 saved *n0
+ # +56 saved %rsp
+ # +64 t[2*$num]
+ #
+ mov $rptr,32(%rsp) # save $rptr
+ mov $nptr,40(%rsp)
+ mov $n0, 48(%rsp)
+ mov %r11, 56(%rsp) # save original %rsp
+.Lsqr_body:
+ ##############################################################
+ # Squaring part:
+ #
+ # a) multiply-n-add everything but a[i]*a[i];
+ # b) shift result of a) by 1 to the left and accumulate
+ # a[i]*a[i] products;
+ #
+ lea 16(%r10),$i # $i=-($num-16)
+ lea ($aptr,$num),$aptr # end of a[] buffer, ($aptr,$i)=&ap[2]
+
+ mov $num,$j # $j=$num
+ pxor %xmm0,%xmm0
+ lea 64(%rsp),$tptr
+.Lbzero: # clear t[$num]
+ movdqa %xmm0,($tptr)
+ lea 16($tptr),$tptr
+ sub \$16,$j
+ jnz .Lbzero
+ jmp .Lsqr_outer
+
+.align 16
+.Lsqr_outer: # comments apply to $num==4 case
+ mov -16($aptr,$i),$a0 # a[0]
+ lea 64(%rsp,$num,2),$tptr # end of tp[] buffer, &tp[2*$num]
+ mov -8($aptr,$i),%rax # a[1]
+ lea -16($tptr,$i),$tptr # end of tp[] window, &tp[2*$num-"$i"]
+ mov ($aptr,$i),$ai # a[2]
+ mov %rax,$a1
+
+ mov -8($tptr,$i),$A0[0] # t[1]
+ xor $A0[1],$A0[1]
+ mul $a0 # a[1]*a[0]
+ add %rax,$A0[0] # a[1]*a[0]+t[1]
+ mov $ai,%rax # a[2]
+ adc %rdx,$A0[1]
+ mov $A0[0],-8($tptr,$i) # t[1]
+
+ xor $A0[0],$A0[0]
+ add ($tptr,$i),$A0[1] # a[2]*a[0]+t[2]
+ adc \$0,$A0[0]
+ mul $a0 # a[2]*a[0]
+ add %rax,$A0[1]
+ mov $ai,%rax
+ adc %rdx,$A0[0]
+ mov $A0[1],($tptr,$i) # t[2]
+
+ lea ($i),$j # j=-16
+ xor $A1[0],$A1[0]
+ jmp .Lsqr_inner
+
+.align 16
+.Lsqr_inner:
+ mov 8($aptr,$j),$ai # a[3]
+ xor $A1[1],$A1[1]
+ add 8($tptr,$j),$A1[0]
+ adc \$0,$A1[1]
+ mul $a1 # a[2]*a[1]
+ add %rax,$A1[0] # a[2]*a[1]+t[3]
+ mov $ai,%rax
+ adc %rdx,$A1[1]
+
+ xor $A0[1],$A0[1]
+ add $A1[0],$A0[0]
+ adc \$0,$A0[1]
+ mul $a0 # a[3]*a[0]
+ add %rax,$A0[0] # a[3]*a[0]+a[2]*a[1]+t[3]
+ mov $ai,%rax
+ adc %rdx,$A0[1]
+ mov $A0[0],8($tptr,$j) # t[3]
+
+ add \$16,$j
+ jz .Lsqr_inner_done
+
+ mov ($aptr,$j),$ai # a[4]
+ xor $A1[0],$A1[0]
+ add ($tptr,$j),$A1[1]
+ adc \$0,$A1[0]
+ mul $a1 # a[3]*a[1]
+ add %rax,$A1[1] # a[3]*a[1]+t[4]
+ mov $ai,%rax
+ adc %rdx,$A1[0]
+
+ xor $A0[0],$A0[0]
+ add $A1[1],$A0[1]
+ adc \$0,$A0[0]
+ mul $a0 # a[4]*a[0]
+ add %rax,$A0[1] # a[4]*a[0]+a[3]*a[1]+t[4]
+ mov $ai,%rax # a[3]
+ adc %rdx,$A0[0]
+ mov $A0[1],($tptr,$j) # t[4]
+ jmp .Lsqr_inner
+
+.align 16
+.Lsqr_inner_done:
+ xor $A1[0],$A1[0]
+ add $A0[1],$A1[1]
+ adc \$0,$A1[0]
+ mul $a1 # a[3]*a[1]
+ add %rax,$A1[1]
+ mov -16($aptr),%rax # a[2]
+ adc %rdx,$A1[0]
+
+ mov $A1[1],($tptr) # t[4]
+ mov $A1[0],8($tptr) # t[5]
+
+ add \$16,$i
+ jnz .Lsqr_outer
+
+ mul $ai # a[2]*a[3]
+___
+{
+my ($shift,$carry)=($a0,$a1);
+$code.=<<___;
+ add \$8,$i
+ xor $shift,$shift
+ sub $num,$i # $i=8-$num
+ xor $carry,$carry
+
+ add $A1[0],%rax # t[5]
+ adc \$0,%rdx
+ mov %rax,8($tptr) # t[5]
+ mov %rdx,16($tptr) # t[6]
+ mov $carry,24($tptr) # t[7]
+
+ mov -8($aptr,$i),%rax # a[0]
+ lea 64(%rsp,$num,2),$tptr
+ mov -16($tptr,$i,2),$A0[0] # t[0]
+ mov -8($tptr,$i,2),$A0[1] # t[1]
+ jmp .Lsqr_shift_n_add
+
+.align 16
+.Lsqr_shift_n_add:
+ lea ($shift,$A0[0],2),$A1[0]# t[2*i]<<1 | shift
+ shr \$63,$A0[0]
+ lea (,$A0[1],2),$A1[1] # t[2*i+1]<<1 |
+ shr \$63,$A0[1]
+ or $A0[0],$A1[1] # | t[2*i]>>63
+ mov 0($tptr,$i,2),$A0[0] # t[2*i+2] # prefetch
+ mov $A0[1],$shift # shift=t[2*i+1]>>63
+ mul %rax # a[i]*a[i]
+ mov 8($tptr,$i,2),$A0[1] # t[2*i+2+1] # prefetch
+ neg $carry # mov $carry,cf
+ adc %rax,$A1[0]
+ mov 0($aptr,$i),%rax # a[i+1] # prefetch
+ adc %rdx,$A1[1]
+ mov $A1[0],-16($tptr,$i,2)
+ sbb $carry,$carry # mov cf,$carry
+ mov $A1[1],-8($tptr,$i,2)
+ add \$8,$i
+ jnz .Lsqr_shift_n_add
+
+ lea ($shift,$A0[0],2),$A1[0]# t[2*i]<<1|shift
+ shr \$63,$A0[0]
+ lea (,$A0[1],2),$A1[1] # t[2*i+1]<<1 |
+ shr \$63,$A0[1]
+ or $A0[0],$A1[1] # | t[2*i]>>63
+ mul %rax # a[i]*a[i]
+ neg $carry # mov $carry,cf
+ adc %rax,$A1[0]
+ adc %rdx,$A1[1]
+ mov $A1[0],-16($tptr)
+ mov $A1[1],-8($tptr)
+___
+}\f
+##############################################################
+# Montgomery reduction part, "word-by-word" algorithm.
+#
+{
+my ($topbit,$nptr)=("%rbp",$aptr);
+my ($m0,$m1)=($a0,$a1);
+my @Ni=("%rbx","%r9");
+$code.=<<___;
+ mov 40(%rsp),$nptr # restore $nptr
+ xor $j,$j
+ mov $num,0(%rsp) # save $num
+ sub $num,$j # $j=-$num
+ mov 64(%rsp),$A0[0] # t[0] # modsched #
+ mov $n0,$m0 # # modsched #
+ lea 64(%rsp,$num,2),%rax # end of t[] buffer
+ lea 64(%rsp,$num),$tptr # end of t[] window
+ mov %rax,8(%rsp) # save end of t[] buffer
+ lea ($nptr,$num),$nptr # end of n[] buffer
+ xor $topbit,$topbit # $topbit=0
+
+ mov 0($nptr,$j),%rax # n[0] # modsched #
+ mov 8($nptr,$j),$Ni[1] # n[1] # modsched #
+ imulq $A0[0],$m0 # m0=t[0]*n0 # modsched #
+ mov %rax,$Ni[0] # # modsched #
+ jmp .Lmont_outer
+
+.align 16
+.Lmont_outer:
+ xor $A0[1],$A0[1]
+ mul $m0 # n[0]*m0
+ add %rax,$A0[0] # n[0]*m0+t[0]
+ mov $Ni[1],%rax
+ adc %rdx,$A0[1]
+ mov $n0,$m1
+
+ xor $A0[0],$A0[0]
+ add 8($tptr,$j),$A0[1]
+ adc \$0,$A0[0]
+ mul $m0 # n[1]*m0
+ add %rax,$A0[1] # n[1]*m0+t[1]
+ mov $Ni[0],%rax
+ adc %rdx,$A0[0]
+
+ imulq $A0[1],$m1
+ lea 16($j),$j
+ jmp .Lmont_inner
+
+.align 16
+.Lmont_inner:
+ mov ($nptr,$j),$Ni[0] # n[2]
+ xor $A1[1],$A1[1]
+ add $A0[1],$A1[0]
+ adc \$0,$A1[1]
+ mul $m1 # n[0]*m1
+ add %rax,$A1[0] # n[0]*m1+"t[1]"
+ mov $Ni[0],%rax
+ adc %rdx,$A1[1]
+ mov $A1[0],-8($tptr,$j) # "t[1]"
+
+ xor $A0[1],$A0[1]
+ add ($tptr,$j),$A0[0]
+ adc \$0,$A0[1]
+ mul $m0 # n[2]*m0
+ add %rax,$A0[0] # n[2]*m0+t[2]
+ mov $Ni[1],%rax
+ adc %rdx,$A0[1]
+
+ mov 8($nptr,$j),$Ni[1] # n[3]
+ xor $A1[0],$A1[0]
+ add $A0[0],$A1[1]
+ adc \$0,$A1[0]
+ mul $m1 # n[1]*m1
+ add %rax,$A1[1] # n[1]*m1+"t[2]"
+ mov $Ni[1],%rax
+ adc %rdx,$A1[0]
+ mov $A1[1],($tptr,$j) # "t[2]"
+
+ xor $A0[0],$A0[0]
+ add 8($tptr,$j),$A0[1]
+ lea 16($j),$j
+ adc \$0,$A0[0]
+ mul $m0 # n[3]*m0
+ add %rax,$A0[1] # n[3]*m0+t[3]
+ mov $Ni[0],%rax
+ adc %rdx,$A0[0]
+ cmp \$0,$j
+ jne .Lmont_inner
+
+ sub 0(%rsp),$j # $j=-$num # modsched #
+ mov $n0,$m0 # # modsched #
+
+ xor $A1[1],$A1[1]
+ add $A0[1],$A1[0]
+ adc \$0,$A1[1]
+ mul $m1 # n[2]*m1
+ add %rax,$A1[0] # n[2]*m1+"t[3]"
+ mov $Ni[1],%rax
+ adc %rdx,$A1[1]
+ mov $A1[0],-8($tptr) # "t[3]"
+
+ xor $A0[1],$A0[1]
+ add ($tptr),$A0[0] # +t[4]
+ adc \$0,$A0[1]
+ mov 0($nptr,$j),$Ni[0] # n[0] # modsched #
+ add $topbit,$A0[0]
+ adc \$0,$A0[1]
+
+ imulq 16($tptr,$j),$m0 # m0=t[0]*n0 # modsched #
+ xor $A1[0],$A1[0]
+ mov 8($nptr,$j),$Ni[1] # n[1] # modsched #
+ add $A0[0],$A1[1]
+ mov 16($tptr,$j),$A0[0] # t[0] # modsched #
+ adc \$0,$A1[0]
+ mul $m1 # n[3]*m1
+ add %rax,$A1[1] # n[3]*m1+"t[4]"
+ mov $Ni[0],%rax # # modsched #
+ adc %rdx,$A1[0]
+ mov $A1[1],($tptr) # "t[4]"
+
+ xor $topbit,$topbit
+ add 8($tptr),$A1[0] # +t[5]
+ adc $topbit,$topbit
+ add $A0[1],$A1[0]
+ lea 16($tptr),$tptr # "t[$num]>>128"
+ adc \$0,$topbit
+ mov $A1[0],-8($tptr) # "t[5]"
+ cmp 8(%rsp),$tptr # are we done?
+ jb .Lmont_outer
+
+ mov 0(%rsp),$num # restore $num
+ mov $topbit,($tptr) # save $topbit
+___
+}\f
+##############################################################
+# Post-condition, 2x unrolled copy from bn_mul_mont
+#
+{
+my ($tptr,$nptr)=("%rbx",$aptr);
+$code.=<<___;
+ lea 64(%rsp,$num),$tptr # upper half of t[2*$num] holds result
+ shr \$4,$num # num/2
+ mov 32(%rsp),$rptr # restore $rptr
+ mov 40(%rsp),$nptr # restore $nptr
+ lea -1($num),$j # j=num/2-1
+
+ mov ($tptr),%rax # tp[0]
+ xor $i,$i # i=0 and clear CF!
+ jmp .Lsqr_sub
+.align 16
+.Lsqr_sub:
+ mov 8($tptr,$i,8),%rdx
+ sbb 0($nptr,$i,8),%rax
+ sbb 8($nptr,$i,8),%rdx
+ mov %rax,0($rptr,$i,8) # rp[i]=tp[i]-np[i]
+ mov %rdx,8($rptr,$i,8) # rp[i]=tp[i]-np[i]
+ mov 16($tptr,$i,8),%rax # tp[i+1]
+ lea 2($i),$i # i++
+ dec $j # doesn't affect CF!
+ jge .Lsqr_sub
+
+ sbb \$0,%rax # handle upmost overflow bit
+ xor $i,$i # i=0
+ and %rax,$tptr
+ not %rax
+ mov $rptr,$nptr
+ and %rax,$nptr
+ lea -1($num),$j
+ or $nptr,$tptr # tp=borrow?tp:rp
+
+ lea 64(%rsp,$num,8),$nptr
+ lea ($nptr,$num,8),$nptr
+ jmp .Lsqr_copy
+.align 16
+.Lsqr_copy: # copy or in-place refresh
+ movdqu ($tptr,$i),%xmm1
+ movdqa %xmm0,64(%rsp,$i) # zap lower half of temporary vector
+ movdqa %xmm0,($nptr,$i) # zap upper half of temporary vector
+ movdqu %xmm1,($rptr,$i)
+ lea 16($i),$i
+ dec $j
+ jge .Lsqr_copy
+___
+}
+$code.=<<___;
+ mov 56(%rsp),%rsi # restore %rsp
+ mov \$1,%rax
+ mov 0(%rsi),%r15
+ mov 8(%rsi),%r14
+ mov 16(%rsi),%r13
+ mov 24(%rsi),%r12
+ mov 32(%rsi),%rbp
+ mov 40(%rsi),%rbx
+ lea 48(%rsi),%rsp
+.Lsqr_epilogue:
+ ret
+.size bn_sqr_mont,.-bn_sqr_mont
+___
+}}}
+$code.=<<___;
.asciz "Montgomery Multiplication for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
.align 16
___
$code.=<<___;
.extern __imp_RtlVirtualUnwind
-.type se_handler,\@abi-omnipotent
+.type mul_handler,\@abi-omnipotent
.align 16
-se_handler:
+mul_handler:
push %rsi
push %rdi
push %rbx
lea .Lprologue(%rip),%r10
cmp %r10,%rbx # context->Rip<.Lprologue
- jb .Lin_prologue
+ jb .Lcommon_seh_tail
mov 152($context),%rax # pull context->Rsp
lea .Lepilogue(%rip),%r10
cmp %r10,%rbx # context->Rip>=.Lepilogue
- jae .Lin_prologue
+ jae .Lcommon_seh_tail
mov 192($context),%r10 # pull $num
mov 8(%rax,%r10,8),%rax # pull saved stack pointer
mov %r14,232($context) # restore context->R14
mov %r15,240($context) # restore context->R15
-.Lin_prologue:
+ jmp .Lcommon_seh_tail
+.size mul_handler,.-mul_handler
+
+.type sqr_handler,\@abi-omnipotent
+.align 16
+sqr_handler:
+ push %rsi
+ push %rdi
+ push %rbx
+ push %rbp
+ push %r12
+ push %r13
+ push %r14
+ push %r15
+ pushfq
+ sub \$64,%rsp
+
+ mov 120($context),%rax # pull context->Rax
+ mov 248($context),%rbx # pull context->Rip
+
+ lea .Lsqr_body(%rip),%r10
+ cmp %r10,%rbx # context->Rip<.Lsqr_body
+ jb .Lcommon_seh_tail
+
+ mov 152($context),%rax # pull context->Rsp
+
+ lea .Lsqr_epilogue(%rip),%r10
+ cmp %r10,%rbx # context->Rip>=.Lsqr_epilogue
+ jae .Lcommon_seh_tail
+
+ mov 56(%rax),%rax # pull saved stack pointer
+ lea 48(%rax),%rax
+
+ mov -8(%rax),%rbx
+ mov -16(%rax),%rbp
+ mov -24(%rax),%r12
+ mov -32(%rax),%r13
+ mov -40(%rax),%r14
+ mov -48(%rax),%r15
+ mov %rbx,144($context) # restore context->Rbx
+ mov %rbp,160($context) # restore context->Rbp
+ mov %r12,216($context) # restore context->R12
+ mov %r13,224($context) # restore context->R13
+ mov %r14,232($context) # restore context->R14
+ mov %r15,240($context) # restore context->R15
+
+.Lcommon_seh_tail:
mov 8(%rax),%rdi
mov 16(%rax),%rsi
mov %rax,152($context) # restore context->Rsp
pop %rdi
pop %rsi
ret
-.size se_handler,.-se_handler
+.size sqr_handler,.-sqr_handler
.section .pdata
.align 4
.rva .LSEH_end_bn_mul_mont
.rva .LSEH_info_bn_mul_mont
+ .rva .LSEH_begin_bn_sqr_mont
+ .rva .LSEH_end_bn_sqr_mont
+ .rva .LSEH_info_bn_sqr_mont
+
.section .xdata
.align 8
.LSEH_info_bn_mul_mont:
.byte 9,0,0,0
- .rva se_handler
+ .rva mul_handler
+.LSEH_info_bn_sqr_mont:
+ .byte 9,0,0,0
+ .rva sqr_handler
___
}
projects / oweals / openssl.git / commitdiff