--- /dev/null
+#!/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/.
+# ====================================================================
+#
+# May 2011
+#
+# The module implements bn_GF2m_mul_2x2 polynomial multiplication used
+# in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
+# the time being... Except that it has three code paths: pure integer
+# code suitable for any x86 CPU, MMX code suitable for PIII and later
+# and PCLMULQDQ suitable for Westmere and later. Improvement varies
+# from one benchmark and �-arch to another. Below are interval values
+# for 163- and 571-bit ECDH benchmarks relative to compiler-generated
+# code:
+#
+# PIII 16%-30%
+# P4 12%-12%
+# Opteron 18%-40%
+# Core2 19%-44%
+# Atom 38%-64%
+# Westmere 53%-121%(PCLMULQDQ)/20%-32%(MMX)
+# Sandy Bridge 72%-127%(PCLMULQDQ)/27%-23%(MMX)
+#
+# Note that above improvement coefficients are not coefficients for
+# bn_GF2m_mul_2x2 itself. For example 120% ECDH improvement is result
+# of bn_GF2m_mul_2x2 being >4x faster. As it gets faster, benchmark
+# is more and more dominated by other subroutines, most notably by
+# BN_GF2m_mod[_mul]_arr...
+
+$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
+push(@INC,"${dir}","${dir}../../perlasm");
+require "x86asm.pl";
+
+&asm_init($ARGV[0],$0,$x86only = $ARGV[$#ARGV] eq "386");
+
+$sse2=0;
+for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
+
+&external_label("OPENSSL_ia32cap_P") if ($sse2);
+
+$a="eax";
+$b="ebx";
+($a1,$a2,$a4)=("ecx","edx","ebp");
+
+$R="mm0";
+@T=("mm1","mm2");
+($A,$B,$B30,$B31)=("mm2","mm3","mm4","mm5");
+@i=("esi","edi");
+
+ if (!$x86only) {
+&function_begin_B("_mul_1x1_mmx");
+ &sub ("esp",32+4);
+ &mov ($a1,$a);
+ &lea ($a2,&DWP(0,$a,$a));
+ &and ($a1,0x3fffffff);
+ &lea ($a4,&DWP(0,$a2,$a2));
+ &mov (&DWP(0*4,"esp"),0);
+ &and ($a2,0x7fffffff);
+ &movd ($A,$a);
+ &movd ($B,$b);
+ &mov (&DWP(1*4,"esp"),$a1); # a1
+ &xor ($a1,$a2); # a1^a2
+ &pxor ($B31,$B31);
+ &pxor ($B30,$B30);
+ &mov (&DWP(2*4,"esp"),$a2); # a2
+ &xor ($a2,$a4); # a2^a4
+ &mov (&DWP(3*4,"esp"),$a1); # a1^a2
+ &pcmpgtd($B31,$A); # broadcast 31st bit
+ &paddd ($A,$A); # $A<<=1
+ &xor ($a1,$a2); # a1^a4=a1^a2^a2^a4
+ &mov (&DWP(4*4,"esp"),$a4); # a4
+ &xor ($a4,$a2); # a2=a4^a2^a4
+ &pand ($B31,$B);
+ &pcmpgtd($B30,$A); # broadcast 30th bit
+ &mov (&DWP(5*4,"esp"),$a1); # a1^a4
+ &xor ($a4,$a1); # a1^a2^a4
+ &psllq ($B31,31);
+ &pand ($B30,$B);
+ &mov (&DWP(6*4,"esp"),$a2); # a2^a4
+ &mov (@i[0],0x7);
+ &mov (&DWP(7*4,"esp"),$a4); # a1^a2^a4
+ &mov ($a4,@i[0]);
+ &and (@i[0],$b);
+ &shr ($b,3);
+ &mov (@i[1],$a4);
+ &psllq ($B30,30);
+ &and (@i[1],$b);
+ &shr ($b,3);
+ &movd ($R,&DWP(0,"esp",@i[0],4));
+ &mov (@i[0],$a4);
+ &and (@i[0],$b);
+ &shr ($b,3);
+ for($n=1;$n<9;$n++) {
+ &movd (@T[1],&DWP(0,"esp",@i[1],4));
+ &mov (@i[1],$a4);
+ &psllq (@T[1],3*$n);
+ &and (@i[1],$b);
+ &shr ($b,3);
+ &pxor ($R,@T[1]);
+
+ push(@i,shift(@i)); push(@T,shift(@T));
+ }
+ &movd (@T[1],&DWP(0,"esp",@i[1],4));
+ &pxor ($R,$B30);
+ &psllq (@T[1],3*$n++);
+ &pxor ($R,@T[1]);
+
+ &movd (@T[0],&DWP(0,"esp",@i[0],4));
+ &pxor ($R,$B31);
+ &psllq (@T[0],3*$n);
+ &add ("esp",32+4);
+ &pxor ($R,@T[0]);
+ &ret ();
+&function_end_B("_mul_1x1_mmx");
+ }
+
+($lo,$hi)=("eax","edx");
+@T=("ecx","ebp");
+
+&function_begin_B("_mul_1x1_ialu");
+ &sub ("esp",32+4);
+ &mov ($a1,$a);
+ &lea ($a2,&DWP(0,$a,$a));
+ &lea ($a4,&DWP(0,"",$a,4));
+ &and ($a1,0x3fffffff);
+ &lea (@i[1],&DWP(0,$lo,$lo));
+ &sar ($lo,31); # broadcast 31st bit
+ &mov (&DWP(0*4,"esp"),0);
+ &and ($a2,0x7fffffff);
+ &mov (&DWP(1*4,"esp"),$a1); # a1
+ &xor ($a1,$a2); # a1^a2
+ &mov (&DWP(2*4,"esp"),$a2); # a2
+ &xor ($a2,$a4); # a2^a4
+ &mov (&DWP(3*4,"esp"),$a1); # a1^a2
+ &xor ($a1,$a2); # a1^a4=a1^a2^a2^a4
+ &mov (&DWP(4*4,"esp"),$a4); # a4
+ &xor ($a4,$a2); # a2=a4^a2^a4
+ &mov (&DWP(5*4,"esp"),$a1); # a1^a4
+ &xor ($a4,$a1); # a1^a2^a4
+ &sar (@i[1],31); # broardcast 30th bit
+ &and ($lo,$b);
+ &mov (&DWP(6*4,"esp"),$a2); # a2^a4
+ &and (@i[1],$b);
+ &mov (&DWP(7*4,"esp"),$a4); # a1^a2^a4
+ &mov ($hi,$lo);
+ &shl ($lo,31);
+ &mov (@T[0],@i[1]);
+ &shr ($hi,1);
+
+ &mov (@i[0],0x7);
+ &shl (@i[1],30);
+ &and (@i[0],$b);
+ &shr (@T[0],2);
+ &xor ($lo,@i[1]);
+
+ &shr ($b,3);
+ &mov (@i[1],0x7); # 5-byte instruction!?
+ &and (@i[1],$b);
+ &shr ($b,3);
+ &xor ($hi,@T[0]);
+ &xor ($lo,&DWP(0,"esp",@i[0],4));
+ &mov (@i[0],0x7);
+ &and (@i[0],$b);
+ &shr ($b,3);
+ for($n=1;$n<9;$n++) {
+ &mov (@T[1],&DWP(0,"esp",@i[1],4));
+ &mov (@i[1],0x7);
+ &mov (@T[0],@T[1]);
+ &shl (@T[1],3*$n);
+ &and (@i[1],$b);
+ &shr (@T[0],32-3*$n);
+ &xor ($lo,@T[1]);
+ &shr ($b,3);
+ &xor ($hi,@T[0]);
+
+ push(@i,shift(@i)); push(@T,shift(@T));
+ }
+ &mov (@T[1],&DWP(0,"esp",@i[1],4));
+ &mov (@T[0],@T[1]);
+ &shl (@T[1],3*$n);
+ &mov (@i[1],&DWP(0,"esp",@i[0],4));
+ &shr (@T[0],32-3*$n); $n++;
+ &mov (@i[0],@i[1]);
+ &xor ($lo,@T[1]);
+ &shl (@i[1],3*$n);
+ &xor ($hi,@T[0]);
+ &shr (@i[0],32-3*$n);
+ &xor ($lo,@i[1]);
+ &xor ($hi,@i[0]);
+
+ &add ("esp",32+4);
+ &ret ();
+&function_end_B("_mul_1x1_ialu");
+
+# void bn_GF2m_mul_2x2(BN_ULONG *r, BN_ULONG a1, BN_ULONG a0, BN_ULONG b1, BN_ULONG b0);
+&function_begin_B("bn_GF2m_mul_2x2");
+if (!$x86only) {
+ &picmeup("edx","OPENSSL_ia32cap_P");
+ &mov ("eax",&DWP(0,"edx"));
+ &mov ("edx",&DWP(4,"edx"));
+ &test ("eax",1<<23); # check MMX bit
+ &jz (&label("ialu"));
+if ($sse2) {
+ &test ("eax",1<<24); # check FXSR bit
+ &jz (&label("mmx"));
+ &test ("edx",1<<1); # check PCLMULQDQ bit
+ &jz (&label("mmx"));
+
+ &movups ("xmm0",&QWP(8,"esp"));
+ &shufps ("xmm0","xmm0",0b10110001);
+ &pclmulqdq ("xmm0","xmm0",1);
+ &mov ("eax",&DWP(4,"esp"));
+ &movups (&QWP(0,"eax"),"xmm0");
+ &ret ();
+
+&set_label("mmx",16);
+}
+ &push ("ebp");
+ &push ("ebx");
+ &push ("esi");
+ &push ("edi");
+ &mov ($a,&wparam(1));
+ &mov ($b,&wparam(3));
+ &call ("_mul_1x1_mmx"); # a1�b1
+ &movq ("mm7",$R);
+
+ &mov ($a,&wparam(2));
+ &mov ($b,&wparam(4));
+ &call ("_mul_1x1_mmx"); # a0�b0
+ &movq ("mm6",$R);
+
+ &mov ($a,&wparam(1));
+ &mov ($b,&wparam(3));
+ &xor ($a,&wparam(2));
+ &xor ($b,&wparam(4));
+ &call ("_mul_1x1_mmx"); # (a0+a1)�(b0+b1)
+ &pxor ($R,"mm7");
+ &mov ($a,&wparam(0));
+ &pxor ($R,"mm6"); # (a0+a1)�(b0+b1)-a1�b1-a0�b0
+
+ &movq ($A,$R);
+ &psllq ($R,32);
+ &pop ("edi");
+ &psrlq ($A,32);
+ &pop ("esi");
+ &pxor ($R,"mm6");
+ &pop ("ebx");
+ &pxor ($A,"mm7");
+ &movq (&QWP(0,$a),$R);
+ &pop ("ebp");
+ &movq (&QWP(8,$a),$A);
+ &emms ();
+ &ret ();
+&set_label("ialu",16);
+}
+ &push ("ebp");
+ &push ("ebx");
+ &push ("esi");
+ &push ("edi");
+ &stack_push(4+1);
+
+ &mov ($a,&wparam(1));
+ &mov ($b,&wparam(3));
+ &call ("_mul_1x1_ialu"); # a1�b1
+ &mov (&DWP(8,"esp"),$lo);
+ &mov (&DWP(12,"esp"),$hi);
+
+ &mov ($a,&wparam(2));
+ &mov ($b,&wparam(4));
+ &call ("_mul_1x1_ialu"); # a0�b0
+ &mov (&DWP(0,"esp"),$lo);
+ &mov (&DWP(4,"esp"),$hi);
+
+ &mov ($a,&wparam(1));
+ &mov ($b,&wparam(3));
+ &xor ($a,&wparam(2));
+ &xor ($b,&wparam(4));
+ &call ("_mul_1x1_ialu"); # (a0+a1)�(b0+b1)
+
+ &mov ("ebp",&wparam(0));
+ @r=("ebx","ecx","edi","esi");
+ &mov (@r[0],&DWP(0,"esp"));
+ &mov (@r[1],&DWP(4,"esp"));
+ &mov (@r[2],&DWP(8,"esp"));
+ &mov (@r[3],&DWP(12,"esp"));
+
+ &xor ($lo,$hi);
+ &xor ($hi,@r[1]);
+ &xor ($lo,@r[0]);
+ &mov (&DWP(0,"ebp"),@r[0]);
+ &xor ($hi,@r[2]);
+ &mov (&DWP(12,"ebp"),@r[3]);
+ &xor ($lo,@r[3]);
+ &stack_pop(4+1);
+ &xor ($hi,@r[3]);
+ &pop ("edi");
+ &xor ($lo,$hi);
+ &pop ("esi");
+ &mov (&DWP(8,"ebp"),$hi);
+ &pop ("ebx");
+ &mov (&DWP(4,"ebp"),$lo);
+ &pop ("ebp");
+ &ret ();
+&function_end_B("bn_GF2m_mul_2x2");
+
+&asciz ("GF(2^m) Multiplication for x86, CRYPTOGAMS by <appro\@openssl.org>");
+
+&asm_finish();
projects / cassiopeia.git / blobdiff