rc4-586.pl: optimize even further...

diff --git a/crypto/rc4/asm/rc4-586.pl b/crypto/rc4/asm/rc4-586.pl
index 0c4cac4e8986e24970ca04fe381526a1b2df1444..4b8bc78b33b294960cc1bdf56354a0ad55ce0a54 100644 (file)
--- a/crypto/rc4/asm/rc4-586.pl
+++ b/crypto/rc4/asm/rc4-586.pl
@@ -37,10 +37,10 @@
 # Pentium III  7.8(*)
 # Intel P4     7.5
 #
 # Pentium III  7.8(*)
 # Intel P4     7.5
 #

-# Opteron      6.4/+14%                # new MMX numbers
-# Core2                5.8/+50%(**)
-# Westmere     5.5/+80%(**)
-# Sandy Bridge 5.4/0%
+# Opteron      6.1/+20%                # new MMX numbers
+# Core2                5.3/+67%(**)
+# Westmere     5.1/+94%(**)
+# Sandy Bridge 5.0/+8%

 #
 # (*)  PIII can actually deliver 6.6 cycles per byte with MMX code,
 #      but this specific code performs poorly on Core2. And vice
 #
 # (*)  PIII can actually deliver 6.6 cycles per byte with MMX code,
 #      but this specific code performs poorly on Core2. And vice


@@ -126,8 +126,7 @@ if ($alt=0) {
   $RC4_loop_mmx = sub {
     my $i=shift;
 
   $RC4_loop_mmx = sub {
     my $i=shift;
 

-       &add    ($yy,$tx);
-       &movz   ($yy,&LB($yy));                         # (*)
+       &add    (&LB($yy),&LB($tx));

        &psllq  ("mm1",8*(($i-1)&7))                    if (abs($i)!=1);
        &mov    ($ty,&DWP(0,$dat,$yy,4));
        &mov    (&DWP(0,$dat,$yy,4),$tx);
        &psllq  ("mm1",8*(($i-1)&7))                    if (abs($i)!=1);
        &mov    ($ty,&DWP(0,$dat,$yy,4));
        &mov    (&DWP(0,$dat,$yy,4),$tx);


@@ -204,6 +203,9 @@ if ($alt=0) {
                &$RC4_loop_mmx(0);
        &set_label("loop_mmx_enter");
                for     ($i=1;$i<8;$i++) { &$RC4_loop_mmx($i); }
                &$RC4_loop_mmx(0);
        &set_label("loop_mmx_enter");
                for     ($i=1;$i<8;$i++) { &$RC4_loop_mmx($i); }

+               &mov    ($ty,$yy);
+               &xor    ($yy,$yy);              # this is second key to Core2
+               &mov    (&LB($yy),&LB($ty));    # and Westmere performance...

                &cmp    ($inp,&DWP(-4,$dat));
                &lea    ($inp,&DWP(8,$inp));
        &jb     (&label("loop_mmx"));
                &cmp    ($inp,&DWP(-4,$dat));
                &lea    ($inp,&DWP(8,$inp));
        &jb     (&label("loop_mmx"));