mirror of https://github.com/openssl/openssl.git
sha256-586.pl optimization.
This commit is contained in:
Andy Polyakov
parent
41409651be
commit
ee9bf3eb6c
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@ -9,20 +9,30 @@
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#
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# SHA256 block transform for x86. September 2007.
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#
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# Performance improvement over compiler generated code varies from
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# 10% to 40% [see below]. Not very impressive on some µ-archs, but
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# it's 5 times smaller and optimizies amount of writes.
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#
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# May 2012.
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#
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# Optimization including one of Pavel Semjanov's ideas resulted in
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# ~5% improvement on P4, AMD and Sandy Bridge, and ~13% on Atom.
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# Pavel also suggested full unroll. While his code runs ~20%/13%/6%
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# faster on K8/Core2/Sandy Bridge, it's 9.6x larger and ~6%/18%/24%
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# slower on P4/Atom/Pentium...
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#
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# Performance in clock cycles per processed byte (less is better):
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#
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# Pentium PIII P4 AMD K8 Core2
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# Pentium PIII P4 AMD K8 Core2 SB(**) Atom
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# gcc 46 36 41 27 26
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# icc 57 33 38 25 23
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# x86 asm 40 30 33 20 18
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# x86_64 asm(*) - - 21 16 16
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# x86 asm 39 29 31 19 18 19(**) 31
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# x86_64 asm(*) - - 21 16 16 18 25
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#
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# (*) x86_64 assembler performance is presented for reference
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# purposes.
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#
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# Performance improvement over compiler generated code varies from
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# 10% to 40% [see above]. Not very impressive on some µ-archs, but
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# it's 5 times smaller and optimizies amount of writes.
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# (*) x86_64 assembler performance is presented for reference
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# purposes.
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# (**) Sandy Bridge results can be improved by ~20% by replacing
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# ror with equivalent shrd.
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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push(@INC,"${dir}","${dir}../../perlasm");
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@ -33,67 +43,62 @@ require "x86asm.pl";
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$A="eax";
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$E="edx";
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$T="ebx";
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$Aoff=&DWP(0,"esp");
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$Boff=&DWP(4,"esp");
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$Coff=&DWP(8,"esp");
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$Doff=&DWP(12,"esp");
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$Eoff=&DWP(16,"esp");
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$Foff=&DWP(20,"esp");
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$Goff=&DWP(24,"esp");
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$Hoff=&DWP(28,"esp");
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$Xoff=&DWP(32,"esp");
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$Aoff=&DWP(4,"esp");
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$Boff=&DWP(8,"esp");
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$Coff=&DWP(12,"esp");
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$Doff=&DWP(16,"esp");
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$Eoff=&DWP(20,"esp");
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$Foff=&DWP(24,"esp");
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$Goff=&DWP(28,"esp");
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$Hoff=&DWP(32,"esp");
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$Xoff=&DWP(36,"esp");
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$K256="ebp";
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# *ror = sub { &shrd(@_[0],@_) };
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sub BODY_00_15() {
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my $in_16_63=shift;
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&mov ("ecx",$E);
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&add ($T,"edi") if ($in_16_63); # T += sigma1(X[-2])
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&ror ("ecx",25-11);
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&mov ("esi",$Foff);
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&ror ("ecx",25-11);
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&add ($T,"edi") if ($in_16_63); # T += sigma1(X[-2])
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&xor ("ecx",$E);
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&ror ("ecx",11-6);
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&mov (&DWP(4*(8+15),"esp"),$T) if ($in_16_63); # save X[0]
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&xor ("ecx",$E);
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&ror ("ecx",6); # Sigma1(e)
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&mov ("edi",$Goff);
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&ror ("ecx",11-6);
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&xor ("esi","edi");
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&xor ("ecx",$E);
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&mov (&DWP(4*(9+15),"esp"),$T) if ($in_16_63); # save X[0]
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&ror ("ecx",6); # Sigma1(e)
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&and ("esi",$E);
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&add ($T,"ecx"); # T += Sigma1(e)
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&xor ("esi","edi");
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&mov ($Eoff,$E); # modulo-scheduled
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&mov ("ecx",$A);
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&and ("esi",$E);
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&mov ($E,$Doff); # e becomes d, which is e in next iteration
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&xor ("esi","edi"); # Ch(e,f,g)
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&mov ("edi",$A);
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&add ($T,"esi"); # T += Ch(e,f,g)
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&ror ("ecx",22-13);
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&add ($T,$Hoff); # T += h
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&xor ("ecx",$A);
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&ror ("ecx",13-2);
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&mov ("esi",$Boff);
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&xor ("ecx",$A);
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&ror ("ecx",2); # Sigma0(a)
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&add ($E,$T); # d += T
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&mov ("edi",$Coff);
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&add ($T,"ecx"); # T += Sigma0(a)
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&mov ($Aoff,$A); # modulo-scheduled
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&mov ("ecx",$A);
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&sub ("esp",4);
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&or ($A,"esi"); # a becomes h, which is a in next iteration
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&and ("ecx","esi");
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&and ($A,"edi");
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&mov ($E,$Doff); # e becomes d, which is e in next iteration
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&ror ("ecx",22-13);
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&add ($T,"esi"); # T += Ch(e,f,g)
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&xor ("ecx",$A);
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&mov ("esi",&DWP(0,$K256));
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&or ($A,"ecx"); # h=Maj(a,b,c)
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&ror ("ecx",13-2);
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&mov ("edi",$Boff);
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&xor ("ecx",$A);
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&mov ($Aoff,$A); # modulo-scheduled
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&ror ("ecx",2); # Sigma0(a)
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&xor ($A,"edi"); # a ^= b
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&add ($T,"esi");
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&push ($A); # (b^c) in next round
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&add ($E,$T); # d += T
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&and ($A,&DWP(4,"esp")); # a &= (b^c)
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&add ($T,"ecx"); # T += Sigma0(a)
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&xor ($A,"edi"); # h = Maj(a,b,c) = Ch(a^b,c,b)
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&add ($K256,4);
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&add ($A,$T); # h += T
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&mov ($T,&DWP(4*(8+15+16-1),"esp")) if ($in_16_63); # preload T
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&add ($E,"esi"); # d += K256[i]
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&add ($A,"esi"); # h += K256[i]
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&add ($A,$T); # h += T
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&mov ($T,&DWP(4*(9+15+16-1),"esp")) if ($in_16_63); # preload T
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}
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&function_begin("sha256_block_data_order");
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@ -123,19 +128,19 @@ sub BODY_00_15() {
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&mov ("eax",&DWP($i*16+0,"edi"));
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&mov ("ebx",&DWP($i*16+4,"edi"));
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&mov ("ecx",&DWP($i*16+8,"edi"));
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&mov ("edx",&DWP($i*16+12,"edi"));
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&bswap ("eax");
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&mov ("edx",&DWP($i*16+12,"edi"));
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&bswap ("ebx");
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&bswap ("ecx");
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&bswap ("edx");
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&push ("eax");
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&bswap ("ecx");
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&push ("ebx");
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&bswap ("edx");
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&push ("ecx");
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&push ("edx");
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}
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&add ("edi",64);
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&sub ("esp",4*8); # place for A,B,C,D,E,F,G,H
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&mov (&DWP(4*(8+16)+4,"esp"),"edi");
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&lea ("esp",&DWP(-4*9,"esp"));# place for A,B,C,D,E,F,G,H
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&mov (&DWP(4*(9+16)+4,"esp"),"edi");
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# copy ctx->h[0-7] to A,B,C,D,E,F,G,H on stack
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&mov ($A,&DWP(0,"esi"));
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@ -144,8 +149,10 @@ sub BODY_00_15() {
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&mov ("edi",&DWP(12,"esi"));
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# &mov ($Aoff,$A);
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&mov ($Boff,"ebx");
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&xor ("ebx","ecx");
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&mov ($Coff,"ecx");
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&mov ($Doff,"edi");
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&mov (&DWP(0,"esp"),"ebx"); # magic
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&mov ($E,&DWP(16,"esi"));
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&mov ("ebx",&DWP(20,"esi"));
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&mov ("ecx",&DWP(24,"esi"));
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@ -156,41 +163,41 @@ sub BODY_00_15() {
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&mov ($Hoff,"edi");
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&set_label("00_15",16);
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&mov ($T,&DWP(4*(8+15),"esp"));
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&mov ($T,&DWP(4*(9+15),"esp"));
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&BODY_00_15();
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&cmp ("esi",0xc19bf174);
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&jne (&label("00_15"));
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&mov ($T,&DWP(4*(8+15+16-1),"esp")); # preloaded in BODY_00_15(1)
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&mov ($T,&DWP(4*(9+15+16-1),"esp")); # preloaded in BODY_00_15(1)
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&set_label("16_63",16);
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&mov ("esi",$T);
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&mov ("ecx",&DWP(4*(8+15+16-14),"esp"));
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&mov ("ecx",&DWP(4*(9+15+16-14),"esp"));
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&ror ("esi",18-7);
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&mov ("edi","ecx");
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&xor ("esi",$T);
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&shr ($T,3);
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&ror ("esi",7);
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&shr ($T,3);
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&ror ("edi",19-17);
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&xor ($T,"esi"); # T = sigma0(X[-15])
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&xor ("edi","ecx");
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&shr ("ecx",10);
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&ror ("edi",17);
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&shr ("ecx",10);
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&add ($T,&DWP(4*(8+15+16),"esp")); # T += X[-16]
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&add ($T,&DWP(4*(9+15+16),"esp")); # T += X[-16]
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&xor ("edi","ecx"); # sigma1(X[-2])
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&add ($T,&DWP(4*(8+15+16-9),"esp")); # T += X[-7]
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&add ($T,&DWP(4*(9+15+16-9),"esp")); # T += X[-7]
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# &add ($T,"edi"); # T += sigma1(X[-2])
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# &mov (&DWP(4*(8+15),"esp"),$T); # save X[0]
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# &mov (&DWP(4*(9+15),"esp"),$T); # save X[0]
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&BODY_00_15(1);
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&cmp ("esi",0xc67178f2);
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&jne (&label("16_63"));
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&mov ("esi",&DWP(4*(8+16+64)+0,"esp"));#ctx
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&mov ("esi",&DWP(4*(9+16+64)+0,"esp"));#ctx
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# &mov ($A,$Aoff);
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&mov ("ebx",$Boff);
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&mov ("ecx",$Coff);
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@ -207,7 +214,7 @@ sub BODY_00_15() {
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&mov ("eax",$Foff);
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&mov ("ebx",$Goff);
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&mov ("ecx",$Hoff);
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&mov ("edi",&DWP(4*(8+16+64)+4,"esp"));#inp
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&mov ("edi",&DWP(4*(9+16+64)+4,"esp"));#inp
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&add ($E,&DWP(16,"esi"));
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&add ("eax",&DWP(20,"esi"));
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&add ("ebx",&DWP(24,"esi"));
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@ -217,7 +224,7 @@ sub BODY_00_15() {
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&mov (&DWP(24,"esi"),"ebx");
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&mov (&DWP(28,"esi"),"ecx");
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&add ("esp",4*(8+16+64)); # destroy frame
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&lea ("esp",&DWP(4*(9+16+64),"esp"));# destroy frame
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&sub ($K256,4*64); # rewind K
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&cmp ("edi",&DWP(8,"esp")); # are we done yet?
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