Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame^] | 1 | #!/usr/local/bin/perl |
| 2 | # x86 assember |
| 3 | |
| 4 | sub bn_mul_words |
| 5 | { |
| 6 | local($name)=@_; |
| 7 | |
| 8 | &function_begin($name,""); |
| 9 | |
| 10 | &comment(""); |
| 11 | $Low="eax"; |
| 12 | $High="edx"; |
| 13 | $a="ebx"; |
| 14 | $w="ecx"; |
| 15 | $r="edi"; |
| 16 | $c="esi"; |
| 17 | $num="ebp"; |
| 18 | |
| 19 | &xor($c,$c); # clear carry |
| 20 | &mov($r,&wparam(0)); # |
| 21 | &mov($a,&wparam(1)); # |
| 22 | &mov($num,&wparam(2)); # |
| 23 | &mov($w,&wparam(3)); # |
| 24 | |
| 25 | &and($num,0xfffffff8); # num / 8 |
| 26 | &jz(&label("mw_finish")); |
| 27 | |
| 28 | &set_label("mw_loop",0); |
| 29 | for ($i=0; $i<32; $i+=4) |
| 30 | { |
| 31 | &comment("Round $i"); |
| 32 | |
| 33 | &mov("eax",&DWP($i,$a,"",0)); # *a |
| 34 | &mul($w); # *a * w |
| 35 | &add("eax",$c); # L(t)+=c |
| 36 | # XXX |
| 37 | |
| 38 | &adc("edx",0); # H(t)+=carry |
| 39 | &mov(&DWP($i,$r,"",0),"eax"); # *r= L(t); |
| 40 | |
| 41 | &mov($c,"edx"); # c= H(t); |
| 42 | } |
| 43 | |
| 44 | &comment(""); |
| 45 | &add($a,32); |
| 46 | &add($r,32); |
| 47 | &sub($num,8); |
| 48 | &jz(&label("mw_finish")); |
| 49 | &jmp(&label("mw_loop")); |
| 50 | |
| 51 | &set_label("mw_finish",0); |
| 52 | &mov($num,&wparam(2)); # get num |
| 53 | &and($num,7); |
| 54 | &jnz(&label("mw_finish2")); |
| 55 | &jmp(&label("mw_end")); |
| 56 | |
| 57 | &set_label("mw_finish2",1); |
| 58 | for ($i=0; $i<7; $i++) |
| 59 | { |
| 60 | &comment("Tail Round $i"); |
| 61 | &mov("eax",&DWP($i*4,$a,"",0));# *a |
| 62 | &mul($w); # *a * w |
| 63 | &add("eax",$c); # L(t)+=c |
| 64 | # XXX |
| 65 | &adc("edx",0); # H(t)+=carry |
| 66 | &mov(&DWP($i*4,$r,"",0),"eax");# *r= L(t); |
| 67 | &mov($c,"edx"); # c= H(t); |
| 68 | &dec($num) if ($i != 7-1); |
| 69 | &jz(&label("mw_end")) if ($i != 7-1); |
| 70 | } |
| 71 | &set_label("mw_end",0); |
| 72 | &mov("eax",$c); |
| 73 | |
| 74 | &function_end($name); |
| 75 | } |
| 76 | |
| 77 | 1; |