x86-mont.pl sse2 tune-up and integer-only squaring procedure.
This commit is contained in:
Andy Polyakov
parent
afda1385bd
commit
1702c8c4bf
1 changed files with 300 additions and 111 deletions
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@ -20,7 +20,14 @@
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# Yet, for being draft, the code improves rsa512 *sign* benchmark by
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# 110%(!), rsa1024 one - by 70% and rsa4096 - by 20%:-)
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push(@INC,"perlasm","../../perlasm");
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# December 2006
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#
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# Modulo-scheduling SSE2 loops results in further 15-20% improvement.
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# Integer-only code [being equipped with dedicated squaring procedure]
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# gives >=30% on rsa512 sign benchmark...
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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push(@INC,"${dir}","${dir}../../perlasm");
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require "x86asm.pl";
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&asm_init($ARGV[0],$0);
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@ -30,7 +37,7 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
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&external_label("OPENSSL_ia32cap_P") if ($sse2);
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&function_begin("bn_mul_mont",$sse2?"EXTRN\t_OPENSSL_ia32cap_P:DWORD":"");
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&function_begin("bn_mul_mont");
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$i="edx";
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$j="ecx";
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@ -51,8 +58,8 @@ $frame=32; # size of above frame rounded up to 16n
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&xor ("eax","eax");
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&mov ("edi",&wparam(5)); # int num
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&cmp ("edi",3);
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&jb (&label("just_leave"));
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&cmp ("edi",4);
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&jl (&label("just_leave"));
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################################# load argument block...
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&mov ("eax",&wparam(0)); # BN_ULONG *rp
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@ -75,10 +82,10 @@ $frame=32; # size of above frame rounded up to 16n
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&mov ($_bp,"ecx");
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&mov ($_np,"edx");
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&mov ($_n0,"esi");
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&lea ($num,&DWP(-2,"edi")); # num is restored to its original value
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&lea ($num,&DWP(-3,"edi")); # num=num-1 to assist modulo-scheduling
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#&mov ($_num,$num); # redundant as $num is not reused
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&mov ($_sp,"ebp"); # saved stack pointer!
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if($sse2) {
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$acc0="mm0"; # mmx register bank layout
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$acc1="mm1";
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@ -117,34 +124,48 @@ $mask="mm7";
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&pmuludq($car1,$mul1); # "t[0]"*np[0]*n0
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&paddq ($car1,$acc0);
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&movd ($acc1,&DWP(4,$np)); # np[1]
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&movd ($acc0,&DWP(4,$ap)); # ap[1]
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&psrlq ($car0,32);
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&psrlq ($car1,32);
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&inc ($j); # j++
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&set_label("1st");
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&movd ($acc0,&DWP(0,$ap,$j,4)); # ap[j]
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&movd ($acc1,&DWP(0,$np,$j,4)); # np[j]
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&pmuludq($acc0,$mul0); # ap[j]*bp[0]
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&pmuludq($acc1,$mul1); # np[j]*m1
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&paddq ($car0,$acc0); # +=c0
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&paddq ($car1,$acc1); # +=c1
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&movq ($acc0,$car0);
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&pand ($acc0,$mask);
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&paddq ($car1,$acc1); # +=c1
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&movd ($acc1,&DWP(4,$np,$j,4)); # np[j+1]
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&paddq ($car1,$acc0); # +=ap[j]*bp[0];
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&movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[j-1]=
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&movd ($acc0,&DWP(4,$ap,$j,4)); # ap[j+1]
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&psrlq ($car0,32);
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&movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[j-1]=
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&psrlq ($car1,32);
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&lea ($j,&DWP(1,$j));
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&cmp ($j,$num);
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&jl (&label("1st"));
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&paddq ($car1,$car0);
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&movq (&DWP($frame-4,"esp",$num,4),$car1);
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&pmuludq($acc0,$mul0); # ap[num-1]*bp[0]
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&pmuludq($acc1,$mul1); # np[num-1]*m1
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&paddq ($car0,$acc0); # +=c0
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&paddq ($car1,$acc1); # +=c1
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&movq ($acc0,$car0);
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&pand ($acc0,$mask);
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&paddq ($car1,$acc0); # +=ap[num-1]*bp[0];
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&movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[num-2]=
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&psrlq ($car0,32);
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&psrlq ($car1,32);
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&paddq ($car1,$car0);
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&movq (&DWP($frame,"esp",$num,4),$car1); # tp[num].tp[num-1]
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&inc ($i); # i++
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&set_label("outer");
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&xor ($j,$j); # j=0
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@ -165,92 +186,113 @@ $mask="mm7";
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&pmuludq($car1,$mul1);
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&paddq ($car1,$acc0);
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&movd ($temp,&DWP($frame+4,"esp")); # tp[1]
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&movd ($acc1,&DWP(4,$np)); # np[1]
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&movd ($acc0,&DWP(4,$ap)); # ap[1]
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&psrlq ($car0,32);
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&psrlq ($car1,32);
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&paddq ($car0,$temp); # +=tp[1]
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&inc ($j); # j++
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&dec ($num);
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&set_label("inner");
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&movd ($acc0,&DWP(0,$ap,$j,4)); # ap[j]
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&movd ($acc1,&DWP(0,$np,$j,4)); # np[j]
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&movd ($temp,&DWP($frame,"esp",$j,4));# tp[j]
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&pmuludq($acc0,$mul0); # ap[j]*bp[i]
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&pmuludq($acc1,$mul1); # np[j]*m1
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&paddq ($car0,$temp); # +=tp[j]
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&paddq ($car0,$acc0); # +=c0
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&paddq ($car1,$acc1); # +=c1
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&movq ($acc0,$car0);
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&movd ($temp,&DWP($frame+4,"esp",$j,4));# tp[j+1]
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&pand ($acc0,$mask);
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&movd ($acc1,&DWP(4,$np,$j,4)); # np[j+1]
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&paddq ($car1,$acc0); # +=ap[j]*bp[i]+tp[j]
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&movd ($acc0,&DWP(4,$ap,$j,4)); # ap[j+1]
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&psrlq ($car0,32);
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&movd (&DWP($frame-4,"esp",$j,4),$car1);# tp[j-1]=
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&psrlq ($car1,32);
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&paddq ($car0,$temp); # +=tp[j+1]
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&dec ($num);
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&lea ($j,&DWP(1,$j)); # j++
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&jnz (&label("inner"));
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&mov ($num,$j);
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&pmuludq($acc0,$mul0); # ap[num-1]*bp[i]
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&pmuludq($acc1,$mul1); # np[num-1]*m1
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&paddq ($car0,$acc0); # +=c0
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&paddq ($car1,$acc1); # +=c1
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&movq ($acc0,$car0);
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&pand ($acc0,$mask);
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&paddq ($car1,$acc1); # +=c1
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&paddq ($car1,$acc0); # +=ap[j]*bp[i]+tp[j]
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&movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[j-1]=
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&paddq ($car1,$acc0); # +=ap[num-1]*bp[i]+tp[num-1]
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&movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[num-2]=
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&psrlq ($car0,32);
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&psrlq ($car1,32);
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&lea ($j,&DWP(1,$j)); # j++
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&cmp ($j,$num);
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&jl (&label("inner"));
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&movd ($temp,&DWP($frame,"esp",$num,4));
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&movd ($temp,&DWP($frame+4,"esp",$num,4)); # += tp[num]
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&paddq ($car1,$car0);
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&paddq ($car1,$temp);
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&movq (&DWP($frame-4,"esp",$num,4),$car1);
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&movq (&DWP($frame,"esp",$num,4),$car1); # tp[num].tp[num-1]
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&lea ($i,&DWP(1,$i)); # i++
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&cmp ($i,$num);
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&jl (&label("outer"));
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&jle (&label("outer"));
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&emms (); # done with mmx bank
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&jmp (&label("common_tail"));
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&set_label("non_sse2",16);
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}
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if (1) {
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if (0) {
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&mov ("esp",$_sp);
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&xor ("eax","eax"); # signal "not fast enough [yet]"
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&jmp (&label("just_leave"));
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# The code below gives ~15% improvement on 512-bit benchmark
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# *only*:-( On all other key lengths it's slower for up to 20%.
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# This is because the original code path holds down the overall
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# amount of multiplications by ~25% by deploying bn_sqr_words.
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# In other words, for the code below to be competitive,
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# dedicated squaring procedure is a must...
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# While the below code provides competitive performance for
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# all key lengthes on modern cores, it's still a tad slower
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# for >=2048-bits keys on *elder* CPUs:-( "Competitive" means
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# compared to the original integer-only assembler. 512-bit
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# RSA sign is better by >=30%, but that's about all one can
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# say about all CPUs...
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} else {
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$inp="esi"; # integer path uses these registers differently
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$word="edi";
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$carry="ebp";
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&sub ($num,1); # non-SSE2 path uses num-1
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&mov ($inp,$_ap);
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&lea ($carry,&DWP(1,$num));
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&mov ($word,$_bp);
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&xor ($j,$j); # j=0
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&mov ("edx",$inp);
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&and ($carry,1); # see if num is even
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&sub ("edx",$word); # see if ap==bp
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&lea ("eax",&DWP(4,$word,$num,4)); # &bp[num]
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&or ($carry,"edx");
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&mov ($word,&DWP(0,$word)); # bp[0]
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&jz (&label("bn_sqr_mont"));
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&mov ($_bpend,"eax");
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&xor ($j,$j);
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&mov ("eax",&DWP(0,$inp));
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&xor ("edx","edx");
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&set_label("mull",16);
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
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&mov ($carry,"edx");
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&mul ($word); # ap[j]*bp[0]
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&add ($carry,"eax");
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&lea ($j,&DWP(1,$j));
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&add ("eax",$carry);
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&adc ("edx",0);
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&mov (&DWP($frame-4,"esp",$j,4),"eax"); # tp[j]=
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j+1]
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&cmp ($j,$num);
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&jb (&label("mull"));
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&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
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&jl (&label("mull"));
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&mov ("eax",&DWP(0,$inp,$num,4)); # ap[num-1]
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&mov ($carry,"edx");
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&mul ($word); # ap[num-1]*bp[0]
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&mov ($word,$_n0);
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&add ("eax",$carry);
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&mov ($inp,$_np);
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&adc ("edx",0);
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&mov ($word,$_n0);
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&mov ($inp,$_np);
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&imul ($word,&DWP($frame,"esp")); # n0*tp[0]
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&imul ($word,&DWP($frame,"esp")); # n0*tp[0]
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&mov (&DWP($frame,"esp",$num,4),"eax"); # tp[num-1]=
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&xor ($j,$j);
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@ -260,99 +302,244 @@ $carry="ebp";
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&mov ("eax",&DWP(0,$inp)); # np[0]
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&mul ($word); # np[0]*m
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&add ("eax",&DWP($frame,"esp")); # +=tp[0]
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&mov ("eax",&DWP(4,$inp)); # np[1]
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&adc ("edx",0);
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&mov ($j,1);
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&inc ($j);
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&jmp (&label("2ndmadd"));
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&set_label("1stmadd",16);
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
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&mov ($carry,"edx");
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&mul ($word); # ap[j]*bp[i]
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&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
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&lea ($j,&DWP(1,$j));
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&add ("eax",&DWP($frame-4,"esp",$j,4)); # +=tp[j]
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&adc ("edx",0);
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&add ("eax",$carry);
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&add ($carry,"eax");
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j+1]
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&adc ("edx",0);
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&mov (&DWP($frame-4,"esp",$j,4),"eax"); # tp[j]=
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&cmp ($j,$num);
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&jb (&label("1stmadd"));
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&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
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&jl (&label("1stmadd"));
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&mov ("eax",&DWP(0,$inp,$num,4)); # ap[num-1]
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&mov ($carry,"edx");
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&mul ($word); # ap[num-1]*bp[i]
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&add ("eax",&DWP($frame,"esp",$num,4)); # +=tp[num-1]
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&mov ($word,$_n0);
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&adc ("edx",0);
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&add ("eax",$carry);
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&mov ($inp,$_np);
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&add ($carry,"eax");
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&adc ("edx",0);
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&imul ($word,&DWP($frame,"esp")); # n0*tp[0]
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&xor ($j,$j);
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&add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
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&mov (&DWP($frame,"esp",$num,4),$carry); # tp[num-1]=
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&adc ($j,0);
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&mov ("eax",&DWP(0,$inp)); # np[0]
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&mov (&DWP($frame+4,"esp",$num,4),"edx"); # tp[num]=
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&mov (&DWP($frame+8,"esp",$num,4),$j); # tp[num+1]=
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&mul ($word); # np[0]*m
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&add ("eax",&DWP($frame,"esp")); # +=tp[0]
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&mov ("eax",&DWP(4,$inp)); # np[1]
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&adc ("edx",0);
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&mov ($j,1);
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&set_label("2ndmadd",16);
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&mov ($carry,"edx");
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&mul ($word); # np[j]*m
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&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
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&lea ($j,&DWP(1,$j));
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&adc ("edx",0);
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&add ($carry,"eax");
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&mov ("eax",&DWP(0,$inp,$j,4)); # np[j+1]
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&adc ("edx",0);
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&cmp ($j,$num);
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&mov (&DWP($frame-8,"esp",$j,4),$carry); # tp[j-1]=
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&jl (&label("2ndmadd"));
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&mov ($carry,"edx");
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&mul ($word); # np[j]*m
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&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
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&adc ("edx",0);
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&add ($carry,"eax");
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&adc ("edx",0);
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&mov (&DWP($frame-4,"esp",$num,4),$carry); # tp[num-2]=
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&xor ("eax","eax");
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&mov ($j,$_bp); # &bp[i]
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&add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
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&adc ("eax",&DWP($frame+8,"esp",$num,4)); # +=tp[num+1]
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&lea ($j,&DWP(4,$j));
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&mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
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&cmp ($j,$_bpend);
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&mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
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&je (&label("x86done"));
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&mov ($word,&DWP(0,$j)); # bp[i]
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&mov ($inp,$_ap);
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&mov ($_bp,$j); # &bp[++i]
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&xor ($j,$j);
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&xor ("edx","edx");
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&mov ("eax",&DWP(0,$inp));
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&jmp (&label("1stmadd"));
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&set_label("bn_sqr_mont",16);
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$sbit=$num;
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&mov ($_num,$num);
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&mov ($_bp,$j); # i=0
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&mov ("eax",$word); # ap[0]
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&mul ($word); # ap[0]*ap[0]
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&mov (&DWP($frame,"esp"),"eax"); # tp[0]=
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&mov ($sbit,"edx");
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&shr ("edx",1);
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&and ($sbit,1);
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&inc ($j);
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&set_label("sqr",16);
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
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&mov ($carry,"edx");
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&mul ($word); # ap[j]*ap[0]
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&add ("eax",$carry);
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&lea ($j,&DWP(1,$j));
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&adc ("edx",0);
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&lea ($carry,&DWP(0,$sbit,"eax",2));
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&shr ("eax",31);
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&cmp ($j,$_num);
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&mov ($sbit,"eax");
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&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
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&jl (&label("sqr"));
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&mov ("eax",&DWP(0,$inp,$j,4)); # ap[num-1]
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&mov ($carry,"edx");
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&mul ($word); # ap[num-1]*ap[0]
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&add ("eax",$carry);
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&mov ($word,$_n0);
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&adc ("edx",0);
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&mov ($inp,$_np);
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&lea ($carry,&DWP(0,$sbit,"eax",2));
|
||||
&imul ($word,&DWP($frame,"esp")); # n0*tp[0]
|
||||
&shr ("eax",31);
|
||||
&mov (&DWP($frame,"esp",$j,4),$carry); # tp[num-1]=
|
||||
|
||||
&lea ($carry,&DWP(0,"eax","edx",2));
|
||||
&mov ("eax",&DWP(0,$inp)); # np[0]
|
||||
&shr ("edx",31);
|
||||
&mov (&DWP($frame+4,"esp",$j,4),$carry); # tp[num]=
|
||||
&mov (&DWP($frame+8,"esp",$j,4),"edx"); # tp[num+1]=
|
||||
|
||||
&mul ($word); # np[0]*m
|
||||
&add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
||||
&mov ($num,$j);
|
||||
&adc ("edx",0);
|
||||
&mov ("eax",&DWP(4,$inp)); # np[1]
|
||||
&mov ($j,1);
|
||||
|
||||
&set_label("3rdmadd",16);
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # np[j]*m
|
||||
&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
|
||||
&adc ("edx",0);
|
||||
&add ($carry,"eax");
|
||||
&mov ("eax",&DWP(4,$inp,$j,4)); # np[j+1]
|
||||
&adc ("edx",0);
|
||||
&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j-1]=
|
||||
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # np[j+1]*m
|
||||
&add ($carry,&DWP($frame+4,"esp",$j,4)); # +=tp[j+1]
|
||||
&lea ($j,&DWP(2,$j));
|
||||
&adc ("edx",0);
|
||||
&add ($carry,"eax");
|
||||
&mov ("eax",&DWP(0,$inp,$j,4)); # np[j+2]
|
||||
&adc ("edx",0);
|
||||
&cmp ($j,$num);
|
||||
&mov (&DWP($frame-8,"esp",$j,4),$carry); # tp[j]=
|
||||
&jl (&label("3rdmadd"));
|
||||
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # np[j]*m
|
||||
&add ($carry,&DWP($frame,"esp",$num,4)); # +=tp[num-1]
|
||||
&adc ("edx",0);
|
||||
&add ($carry,"eax");
|
||||
&adc ("edx",0);
|
||||
&mov (&DWP($frame-4,"esp",$num,4),$carry); # tp[num-2]=
|
||||
|
||||
&mov ($j,$_bp); # i
|
||||
&xor ("eax","eax");
|
||||
&mov ($inp,$_ap);
|
||||
&add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
||||
&adc ("eax",&DWP($frame+8,"esp",$num,4)); # +=tp[num+1]
|
||||
&mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
|
||||
&cmp ($j,$num);
|
||||
&mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
|
||||
&je (&label("x86done"));
|
||||
|
||||
&mov ($word,&DWP(4,$inp,$j,4)); # ap[i]
|
||||
&lea ($j,&DWP(1,$j));
|
||||
&mov ("eax",$word);
|
||||
&mov ($_bp,$j); # ++i
|
||||
&mul ($word); # ap[i]*ap[i]
|
||||
&add ("eax",&DWP($frame,"esp",$j,4)); # +=tp[i]
|
||||
&adc ("edx",0);
|
||||
&mov (&DWP($frame,"esp",$j,4),"eax"); # tp[i]=
|
||||
&xor ($carry,$carry);
|
||||
&cmp ($j,$num);
|
||||
&lea ($j,&DWP(1,$j));
|
||||
&je (&label("sqrlast"));
|
||||
|
||||
&mov ($sbit,"edx"); # zaps $num
|
||||
&shr ("edx",1);
|
||||
&and ($sbit,1);
|
||||
&set_label("sqradd",16);
|
||||
&mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # ap[j]*ap[i]
|
||||
&add ("eax",$carry);
|
||||
&lea ($j,&DWP(1,$j));
|
||||
&adc ("edx",0);
|
||||
&lea ($carry,&DWP(0,$sbit,"eax",2));
|
||||
&shr ("eax",31);
|
||||
&add ($carry,&DWP($frame-4,"esp",$j,4)); # +=tp[j]
|
||||
&adc ("eax",0);
|
||||
&cmp ($j,$_num);
|
||||
&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
|
||||
&mov ($sbit,"eax");
|
||||
&jle (&label("sqradd"));
|
||||
|
||||
&mov ($carry,"edx");
|
||||
&lea ("edx",&DWP(0,$sbit,"edx",2));
|
||||
&shr ($carry,31);
|
||||
&set_label("sqrlast");
|
||||
&mov ($word,$_n0);
|
||||
&mov ($inp,$_np);
|
||||
&imul ($word,&DWP($frame,"esp")); # n0*tp[0]
|
||||
|
||||
&xor ($j,$j);
|
||||
&add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
||||
&mov (&DWP($frame,"esp",$num,4),"eax"); # tp[num-1]=
|
||||
&adc ($j,0);
|
||||
&mov (&DWP($frame+4,"esp",$num,4),"edx"); # tp[num]=
|
||||
&mov (&DWP($frame+8,"esp",$num,4),$j); # tp[num+1]=
|
||||
|
||||
&add ("edx",&DWP($frame,"esp",$j,4)); # +=tp[num]
|
||||
&mov ("eax",&DWP(0,$inp)); # np[0]
|
||||
&adc ($carry,0);
|
||||
&mov (&DWP($frame,"esp",$j,4),"edx"); # tp[num]=
|
||||
&mov (&DWP($frame+4,"esp",$j,4),$carry); # tp[num+1]=
|
||||
|
||||
&mul ($word); # np[0]*m
|
||||
&add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
||||
&lea ($num,&DWP(-1,$j));
|
||||
&adc ("edx",0);
|
||||
&mov ($j,1);
|
||||
&mov ("eax",&DWP(4,$inp)); # np[1]
|
||||
|
||||
&set_label("2ndmadd",16);
|
||||
&mov ("eax",&DWP(0,$inp,$j,4)); # np[j]
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # np[j]*m
|
||||
&lea ($j,&DWP(1,$j));
|
||||
&add ("eax",&DWP($frame-4,"esp",$j,4)); # +=tp[j]
|
||||
&adc ("edx",0);
|
||||
&add ("eax",$carry);
|
||||
&adc ("edx",0);
|
||||
&mov (&DWP($frame-8,"esp",$j,4),"eax"); # tp[j-1]=
|
||||
&cmp ($j,$num);
|
||||
&jb (&label("2ndmadd"));
|
||||
|
||||
&mov ("eax",&DWP(0,$inp,$num,4)); # np[num-1]
|
||||
&mov ($carry,"edx");
|
||||
&mul ($word); # np[num-1]*m
|
||||
&add ("eax",&DWP($frame,"esp",$num,4)); # +=tp[num-1]
|
||||
&adc ("edx",0);
|
||||
&add ("eax",$carry);
|
||||
&adc ("edx",0);
|
||||
&mov (&DWP($frame-4,"esp",$num,4),"eax"); # tp[num-2]=
|
||||
|
||||
&xor ("eax","eax");
|
||||
&add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
||||
&adc ("eax",&DWP($frame+8,"esp",$num,4)); # +=tp[num+1]
|
||||
&mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
|
||||
&mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
|
||||
|
||||
&mov ($carry,$_bp); # &bp[i]
|
||||
&add ($carry,4);
|
||||
&cmp ($carry,$_bpend);
|
||||
&je (&label("x86done"));
|
||||
&mov ($word,&DWP(0,$carry)); # bp[i]
|
||||
&mov ($inp,$_ap);
|
||||
&mov ($_bp,$carry); # &bp[++i]
|
||||
&xor ($j,$j);
|
||||
&xor ("edx","edx");
|
||||
&jmp (&label("1stmadd"));
|
||||
|
||||
&set_label("x86done",16);
|
||||
&jmp (&label("3rdmadd"));
|
||||
|
||||
&set_label("x86done",4);
|
||||
&mov ($np,$_np); # make adjustments for tail processing
|
||||
&add ($num,1);
|
||||
}
|
||||
|
||||
&set_label("common_tail",16);
|
||||
&mov ("esi",&DWP($frame,"esp",$num,4));# load upmost overflow bit
|
||||
&mov ("esi",&DWP($frame+4,"esp",$num,4));# load upmost overflow bit
|
||||
&mov ($rp,$_rp); # load result pointer
|
||||
# [$ap and $bp are zapped]
|
||||
&xor ($i,$i); # i=0
|
||||
&lea ($j,&DWP(-1,$num)); # j=num-1
|
||||
&mov ($j,$num); # j=num-1
|
||||
&cmp ("esi",0); # clears CF unconditionally
|
||||
&jnz (&label("sub"));
|
||||
&mov ("eax",&DWP($frame,"esp",$j,4));
|
||||
|
|
@ -373,7 +560,7 @@ $carry="ebp";
|
|||
&lea ($i,&DWP(1,$i)); # i++
|
||||
&dec ($j); # doesn't affect CF!
|
||||
&jge (&label("sub"));
|
||||
&lea ($j,&DWP(-1,$num)); # j=num-1
|
||||
&mov ($j,$num); # j=num-1
|
||||
&sbb ("esi",0); # esi holds upmost overflow bit
|
||||
&jc (&label("copy"));
|
||||
&set_label("zap",16);
|
||||
|
|
@ -387,4 +574,6 @@ $carry="ebp";
|
|||
&set_label("just_leave");
|
||||
&function_end("bn_mul_mont");
|
||||
|
||||
&asciz("Montgomery Multiplication for x86, CRYPTOGAMS by <appro\@openssl.org>");
|
||||
|
||||
&asm_finish();
|
||||
|
|
|
|||
Loading…
Reference in a new issue