Intel assembler version for bn_sub_part_words(). I haven't got
authorUlf Möller <ulf@openssl.org>
Wed, 6 Dec 2000 04:16:38 +0000 (04:16 +0000)
committerUlf Möller <ulf@openssl.org>
Wed, 6 Dec 2000 04:16:38 +0000 (04:16 +0000)
reliable timings yet, please try it out!

crypto/bn/asm/bn-586.pl
crypto/bn/bn_mul.c

index 5191bed..2a074ef 100644 (file)
@@ -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);
+       }
+
index eb5d525..2810115 100644 (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,