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88 lines
1.7 KiB
Perl
88 lines
1.7 KiB
Perl
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#!/usr/local/bin/perl
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# x86 assember
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sub bn_mul_add_words
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{
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local($name)=@_;
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&function_begin($name,"");
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&comment("");
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$Low="eax";
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$High="edx";
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$a="ebx";
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$w="ebp";
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$r="edi";
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$c="esi";
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&xor($c,$c); # clear carry
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&mov($r,&wparam(0)); #
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&mov("ecx",&wparam(2)); #
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&mov($a,&wparam(1)); #
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&and("ecx",0xfffffff8); # num / 8
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&mov($w,&wparam(3)); #
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&push("ecx"); # Up the stack for a tmp variable
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&jz(&label("maw_finish"));
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&set_label("maw_loop",0);
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&mov(&swtmp(0),"ecx"); #
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for ($i=0; $i<32; $i+=4)
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{
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&comment("Round $i");
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&mov("eax",&DWP($i,$a,"",0)); # *a
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&mul($w); # *a * w
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&add("eax",$c); # L(t)+= *r
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&mov($c,&DWP($i,$r,"",0)); # L(t)+= *r
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&adc("edx",0); # H(t)+=carry
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&add("eax",$c); # L(t)+=c
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&adc("edx",0); # H(t)+=carry
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&mov(&DWP($i,$r,"",0),"eax"); # *r= L(t);
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&mov($c,"edx"); # c= H(t);
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}
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&comment("");
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&mov("ecx",&swtmp(0)); #
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&add($a,32);
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&add($r,32);
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&sub("ecx",8);
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&jnz(&label("maw_loop"));
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&set_label("maw_finish",0);
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&mov("ecx",&wparam(2)); # get num
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&and("ecx",7);
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&jnz(&label("maw_finish2")); # helps branch prediction
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&jmp(&label("maw_end"));
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&set_label("maw_finish2",1);
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for ($i=0; $i<7; $i++)
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{
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&comment("Tail Round $i");
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&mov("eax",&DWP($i*4,$a,"",0));# *a
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&mul($w); # *a * w
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&add("eax",$c); # L(t)+=c
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&mov($c,&DWP($i*4,$r,"",0)); # L(t)+= *r
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&adc("edx",0); # H(t)+=carry
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&add("eax",$c);
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&adc("edx",0); # H(t)+=carry
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&dec("ecx") if ($i != 7-1);
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&mov(&DWP($i*4,$r,"",0),"eax"); # *r= L(t);
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&mov($c,"edx"); # c= H(t);
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&jz(&label("maw_end")) if ($i != 7-1);
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}
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&set_label("maw_end",0);
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&mov("eax",$c);
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&pop("ecx"); # clear variable from
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&function_end($name);
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}
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1;
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