2 # Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
4 # Licensed under the Apache License 2.0 (the "License"). You may not use
5 # this file except in compliance with the License. You can obtain a copy
6 # in the file LICENSE in the source distribution or at
7 # https://www.openssl.org/source/license.html
10 # ====================================================================
11 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
12 # project. The module is, however, dual licensed under OpenSSL and
13 # CRYPTOGAMS licenses depending on where you obtain it. For further
14 # details see http://www.openssl.org/~appro/cryptogams/.
15 # ====================================================================
19 # The module implements bn_GF2m_mul_2x2 polynomial multiplication used
20 # in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
21 # the time being... Except that it has three code paths: pure integer
22 # code suitable for any x86 CPU, MMX code suitable for PIII and later
23 # and PCLMULQDQ suitable for Westmere and later. Improvement varies
24 # from one benchmark and µ-arch to another. Below are interval values
25 # for 163- and 571-bit ECDH benchmarks relative to compiler-generated
33 # Westmere 53%-121%(PCLMULQDQ)/20%-32%(MMX)
34 # Sandy Bridge 72%-127%(PCLMULQDQ)/27%-23%(MMX)
36 # Note that above improvement coefficients are not coefficients for
37 # bn_GF2m_mul_2x2 itself. For example 120% ECDH improvement is result
38 # of bn_GF2m_mul_2x2 being >4x faster. As it gets faster, benchmark
39 # is more and more dominated by other subroutines, most notably by
40 # BN_GF2m_mod[_mul]_arr...
42 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
43 push(@INC,"${dir}","${dir}../../perlasm");
46 $output = pop and open STDOUT,">$output";
48 &asm_init($ARGV[0],$x86only = $ARGV[$#ARGV] eq "386");
51 for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
53 &external_label("OPENSSL_ia32cap_P") if ($sse2);
57 ($a1,$a2,$a4)=("ecx","edx","ebp");
61 ($A,$B,$B30,$B31)=("mm2","mm3","mm4","mm5");
65 &function_begin_B("_mul_1x1_mmx");
68 &lea ($a2,&DWP(0,$a,$a));
69 &and ($a1,0x3fffffff);
70 &lea ($a4,&DWP(0,$a2,$a2));
71 &mov (&DWP(0*4,"esp"),0);
72 &and ($a2,0x7fffffff);
75 &mov (&DWP(1*4,"esp"),$a1); # a1
76 &xor ($a1,$a2); # a1^a2
79 &mov (&DWP(2*4,"esp"),$a2); # a2
80 &xor ($a2,$a4); # a2^a4
81 &mov (&DWP(3*4,"esp"),$a1); # a1^a2
82 &pcmpgtd($B31,$A); # broadcast 31st bit
83 &paddd ($A,$A); # $A<<=1
84 &xor ($a1,$a2); # a1^a4=a1^a2^a2^a4
85 &mov (&DWP(4*4,"esp"),$a4); # a4
86 &xor ($a4,$a2); # a2=a4^a2^a4
88 &pcmpgtd($B30,$A); # broadcast 30th bit
89 &mov (&DWP(5*4,"esp"),$a1); # a1^a4
90 &xor ($a4,$a1); # a1^a2^a4
93 &mov (&DWP(6*4,"esp"),$a2); # a2^a4
95 &mov (&DWP(7*4,"esp"),$a4); # a1^a2^a4
103 &movd ($R,&DWP(0,"esp",@i[0],4));
107 for($n=1;$n<9;$n++) {
108 &movd (@T[1],&DWP(0,"esp",@i[1],4));
115 push(@i,shift(@i)); push(@T,shift(@T));
117 &movd (@T[1],&DWP(0,"esp",@i[1],4));
119 &psllq (@T[1],3*$n++);
122 &movd (@T[0],&DWP(0,"esp",@i[0],4));
128 &function_end_B("_mul_1x1_mmx");
131 ($lo,$hi)=("eax","edx");
134 &function_begin_B("_mul_1x1_ialu");
137 &lea ($a2,&DWP(0,$a,$a));
138 &lea ($a4,&DWP(0,"",$a,4));
139 &and ($a1,0x3fffffff);
140 &lea (@i[1],&DWP(0,$lo,$lo));
141 &sar ($lo,31); # broadcast 31st bit
142 &mov (&DWP(0*4,"esp"),0);
143 &and ($a2,0x7fffffff);
144 &mov (&DWP(1*4,"esp"),$a1); # a1
145 &xor ($a1,$a2); # a1^a2
146 &mov (&DWP(2*4,"esp"),$a2); # a2
147 &xor ($a2,$a4); # a2^a4
148 &mov (&DWP(3*4,"esp"),$a1); # a1^a2
149 &xor ($a1,$a2); # a1^a4=a1^a2^a2^a4
150 &mov (&DWP(4*4,"esp"),$a4); # a4
151 &xor ($a4,$a2); # a2=a4^a2^a4
152 &mov (&DWP(5*4,"esp"),$a1); # a1^a4
153 &xor ($a4,$a1); # a1^a2^a4
154 &sar (@i[1],31); # broadcast 30th bit
156 &mov (&DWP(6*4,"esp"),$a2); # a2^a4
158 &mov (&DWP(7*4,"esp"),$a4); # a1^a2^a4
171 &mov (@i[1],0x7); # 5-byte instruction!?
175 &xor ($lo,&DWP(0,"esp",@i[0],4));
179 for($n=1;$n<9;$n++) {
180 &mov (@T[1],&DWP(0,"esp",@i[1],4));
185 &shr (@T[0],32-3*$n);
190 push(@i,shift(@i)); push(@T,shift(@T));
192 &mov (@T[1],&DWP(0,"esp",@i[1],4));
195 &mov (@i[1],&DWP(0,"esp",@i[0],4));
196 &shr (@T[0],32-3*$n); $n++;
201 &shr (@i[0],32-3*$n);
207 &function_end_B("_mul_1x1_ialu");
209 # void bn_GF2m_mul_2x2(BN_ULONG *r, BN_ULONG a1, BN_ULONG a0, BN_ULONG b1, BN_ULONG b0);
210 &function_begin_B("bn_GF2m_mul_2x2");
212 &picmeup("edx","OPENSSL_ia32cap_P");
213 &mov ("eax",&DWP(0,"edx"));
214 &mov ("edx",&DWP(4,"edx"));
215 &test ("eax",1<<23); # check MMX bit
216 &jz (&label("ialu"));
218 &test ("eax",1<<24); # check FXSR bit
220 &test ("edx",1<<1); # check PCLMULQDQ bit
223 &movups ("xmm0",&QWP(8,"esp"));
224 &shufps ("xmm0","xmm0",0b10110001);
225 &pclmulqdq ("xmm0","xmm0",1);
226 &mov ("eax",&DWP(4,"esp"));
227 &movups (&QWP(0,"eax"),"xmm0");
230 &set_label("mmx",16);
236 &mov ($a,&wparam(1));
237 &mov ($b,&wparam(3));
238 &call ("_mul_1x1_mmx"); # a1·b1
241 &mov ($a,&wparam(2));
242 &mov ($b,&wparam(4));
243 &call ("_mul_1x1_mmx"); # a0·b0
246 &mov ($a,&wparam(1));
247 &mov ($b,&wparam(3));
248 &xor ($a,&wparam(2));
249 &xor ($b,&wparam(4));
250 &call ("_mul_1x1_mmx"); # (a0+a1)·(b0+b1)
252 &mov ($a,&wparam(0));
253 &pxor ($R,"mm6"); # (a0+a1)·(b0+b1)-a1·b1-a0·b0
263 &movq (&QWP(0,$a),$R);
265 &movq (&QWP(8,$a),$A);
268 &set_label("ialu",16);
276 &mov ($a,&wparam(1));
277 &mov ($b,&wparam(3));
278 &call ("_mul_1x1_ialu"); # a1·b1
279 &mov (&DWP(8,"esp"),$lo);
280 &mov (&DWP(12,"esp"),$hi);
282 &mov ($a,&wparam(2));
283 &mov ($b,&wparam(4));
284 &call ("_mul_1x1_ialu"); # a0·b0
285 &mov (&DWP(0,"esp"),$lo);
286 &mov (&DWP(4,"esp"),$hi);
288 &mov ($a,&wparam(1));
289 &mov ($b,&wparam(3));
290 &xor ($a,&wparam(2));
291 &xor ($b,&wparam(4));
292 &call ("_mul_1x1_ialu"); # (a0+a1)·(b0+b1)
294 &mov ("ebp",&wparam(0));
295 @r=("ebx","ecx","edi","esi");
296 &mov (@r[0],&DWP(0,"esp"));
297 &mov (@r[1],&DWP(4,"esp"));
298 &mov (@r[2],&DWP(8,"esp"));
299 &mov (@r[3],&DWP(12,"esp"));
304 &mov (&DWP(0,"ebp"),@r[0]);
306 &mov (&DWP(12,"ebp"),@r[3]);
313 &mov (&DWP(8,"ebp"),$hi);
315 &mov (&DWP(4,"ebp"),$lo);
318 &function_end_B("bn_GF2m_mul_2x2");
320 &asciz ("GF(2^m) Multiplication for x86, CRYPTOGAMS by <appro\@openssl.org>");
324 close STDOUT or die "error closing STDOUT";