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Intel assembler version for bn_sub_part_words(). I haven't got

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reliable timings yet, please try it out!
This commit is contained in:
Ulf Möller 2000-12-06 04:16:38 +00:00
parent ef8f14a882
commit 240f516939
2 changed files with 215 additions and 2 deletions
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215
crypto/bn/asm/bn-586.pl
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@ -11,6 +11,7 @@ require "x86asm.pl";
&bn_div_words("bn_div_words");
&bn_add_words("bn_add_words");
&bn_sub_words("bn_sub_words");
&bn_sub_part_words("bn_sub_part_words");
&asm_finish();
@ -300,7 +301,7 @@ sub bn_add_words
&add($tmp1,$tmp2);
&adc($c,0);
&dec($num) if ($i != 6);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *a
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&jz(&label("aw_end")) if ($i != 6);
}
&set_label("aw_end",0);
@ -372,7 +373,7 @@ sub bn_sub_words
&sub($tmp1,$tmp2);
&adc($c,0);
&dec($num) if ($i != 6);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *a
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&jz(&label("aw_end")) if ($i != 6);
}
&set_label("aw_end",0);
@ -382,3 +383,213 @@ sub bn_sub_words
&function_end($name);
}
sub bn_sub_part_words
{
local($name)=@_;
&function_begin($name,"");
&comment("");
$a="esi";
$b="edi";
$c="eax";
$r="ebx";
$tmp1="ecx";
$tmp2="edx";
$num="ebp";
&mov($r,&wparam(0)); # get r
&mov($a,&wparam(1)); # get a
&mov($b,&wparam(2)); # get b
&mov($num,&wparam(3)); # get num
&xor($c,$c); # clear carry
&and($num,0xfffffff8); # num / 8
&jz(&label("aw_finish"));
&set_label("aw_loop",0);
for ($i=0; $i<8; $i++)
{
&comment("Round $i");
&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
&mov($tmp2,&DWP($i*4,$b,"",0)); # *b
&sub($tmp1,$c);
&mov($c,0);
&adc($c,$c);
&sub($tmp1,$tmp2);
&adc($c,0);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
}
&comment("");
&add($a,32);
&add($b,32);
&add($r,32);
&sub($num,8);
&jnz(&label("aw_loop"));
&set_label("aw_finish",0);
&mov($num,&wparam(3)); # get num
&and($num,7);
&jz(&label("aw_end"));
for ($i=0; $i<7; $i++)
{
&comment("Tail Round $i");
&mov($tmp1,&DWP(0,$a,"",0)); # *a
&mov($tmp2,&DWP(0,$b,"",0));# *b
&sub($tmp1,$c);
&mov($c,0);
&adc($c,$c);
&sub($tmp1,$tmp2);
&adc($c,0);
&mov(&DWP(0,$r,"",0),$tmp1); # *r
&add($a, 4);
&add($b, 4);
&add($r, 4);
&dec($num) if ($i != 6);
&jz(&label("aw_end")) if ($i != 6);
}
&set_label("aw_end",0);
&cmp(&wparam(4),0);
&je(&label("pw_end"));
&mov($num,&wparam(3)); # get num
&mov($num,&wparam(4)); # get dl
&cmp($num,0);
&je(&label("pw_end")); # unnoetig
&jge(&label("pw_pos"));
&comment("pw_neg");
&mov($tmp2,0);
&sub($tmp2,$num);
&mov($num,$tmp2);
&and($num,0xfffffff8); # num / 8
&jz(&label("pw_neg_finish"));
&set_label("pw_neg_loop",0);
for ($i=0; $i<8; $i++)
{
&comment("dl<0 Round $i");
&mov($tmp1,0);
&mov($tmp2,&DWP($i*4,$b,"",0)); # *b
&sub($tmp1,$c);
&mov($c,0);
&adc($c,$c);
&sub($tmp1,$tmp2);
&adc($c,0);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
}
&comment("");
&add($b,32);
&add($r,32);
&sub($num,8);
&jnz(&label("pw_neg_loop"));
&set_label("pw_neg_finish",0);
&mov($tmp2,&wparam(4)); # get dl
&mov($num,0);
&sub($num,$tmp2);
&and($num,7);
&jz(&label("pw_end"));
for ($i=0; $i<7; $i++)
{
&comment("dl<0 Tail Round $i");
&mov($tmp1,0);
&mov($tmp2,&DWP($i*4,$b,"",0));# *b
&sub($tmp1,$c);
&mov($c,0);
&adc($c,$c);
&sub($tmp1,$tmp2);
&adc($c,0);
&dec($num) if ($i != 6);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&jz(&label("pw_end")) if ($i != 6);
}
&jmp(&label("pw_end"));
&set_label("pw_pos",0);
&and($num,0xfffffff8); # num / 8
&jz(&label("pw_pos_finish"));
&set_label("pw_pos_loop",0);
for ($i=0; $i<8; $i++)
{
&comment("dl>0 Round $i");
&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
&sub($tmp1,$c);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&jnc(&label("pw_nc".$i));
}
&comment("");
&add($a,32);
&add($r,32);
&sub($num,8);
&jnz(&label("pw_pos_loop"));
&set_label("pw_pos_finish",0);
&mov($num,&wparam(4)); # get dl
&and($num,7);
&jz(&label("pw_end"));
for ($i=0; $i<7; $i++)
{
&comment("dl>0 Tail Round $i");
&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
&sub($tmp1,$c);
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&jnc(&label("pw_tail_nc".$i));
&dec($num) if ($i != 6);
&jz(&label("pw_end")) if ($i != 6);
}
&mov($c,1);
&jmp(&label("pw_end"));
&set_label("pw_nc_loop",0);
for ($i=0; $i<8; $i++)
{
&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&set_label("pw_nc".$i,0);
}
&comment("");
&add($a,32);
&add($r,32);
&sub($num,8);
&jnz(&label("pw_nc_loop"));
&mov($num,&wparam(4)); # get dl
&and($num,7);
&jz(&label("pw_nc_end"));
for ($i=0; $i<7; $i++)
{
&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
&set_label("pw_tail_nc".$i,0);
&dec($num) if ($i != 6);
&jz(&label("pw_nc_end")) if ($i != 6);
}
&set_label("pw_nc_end",0);
&mov($c,0);
&set_label("pw_end",0);
# &mov("eax",$c); # $c is "eax"
&function_end($name);
}

2
crypto/bn/bn_mul.c
View File

@ -66,6 +66,7 @@
#include "cryptlib.h"
#include "bn_lcl.h"
#if defined(NO_ASM) || !defined(i386)
/* Here follows specialised variants of bn_add_words() and
bn_sub_words(). They have the property performing operations on
arrays of different sizes. The sizes of those arrays is expressed through
@ -201,6 +202,7 @@ BN_ULONG bn_sub_part_words(BN_ULONG *r,
}
return c;
}
#endif
BN_ULONG bn_add_part_words(BN_ULONG *r,
const BN_ULONG *a, const BN_ULONG *b,