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rc4-586.pl: 50% improvement on Core2 and 80% on Westmere.

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This commit is contained in:
Andy Polyakov 2011-05-24 13:07:29 +00:00
parent 73ab341130
commit 760d2551fb
1 changed files with 129 additions and 8 deletions
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137
crypto/rc4/asm/rc4-586.pl
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@ -28,6 +28,31 @@
#
# <appro@fy.chalmers.se>
# May 2011
#
# Optimize for Core2 and Westmere [and Opteron]. Current performance
# in cycles per processed byte (less is better) is:
#
# Pentium 10.2 # original numbers
# 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%
#
# (*) PIII can actually deliver 6.6 cycles per byte with MMX code,
# but this specific code performs poorly on Core2. While below
# MMX code delivering 5.8 on Core2 performs at 8.0 on PIII:-(
# As PIII is not a "hot" CPU [anymore], I chose not to introduce
# PIII-specific code path, which is why MMX code path is quarded
# by SSE2 bit (see below), not MMX.
# (**) Performance vs. block size on Core2 and Westmere had a maximum
# at ... 64 bytes block size. And it was quite a maximum, 40-60%
# in comparison to largest 8KB block size. Above improvement
# coefficients are for the largest block size.
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
push(@INC,"${dir}","${dir}../../perlasm");
require "x86asm.pl";
@ -62,6 +87,60 @@ sub RC4_loop {
&$func ($out,&DWP(0,$dat,$ty,4));
}
if ($alt=0) {
# works ~5% faster on Atom and ~20% slower on Core2
my @XX=($xx,$out);
$RC4_loop_mmx = sub {
my $i=shift;
&add ($yy,$tx);
&movz ($yy,&LB($yy));
&lea (@XX[1],&DWP(1,@XX[0]));
&psllq ("mm1",8*(($i-1)&7)) if (abs($i)!=1);
&and (@XX[1],0xff);
&mov ($ty,&DWP(0,$dat,$yy,4));
&mov (&DWP(0,$dat,$yy,4),$tx);
&mov (&DWP(0,$dat,$XX[0],4),$ty);
&add ($ty,$tx);
&movd (@XX[0],"mm7") if ($i==0);
&movz ($ty,&LB($ty));
&mov ($tx,&DWP(0,$dat,@XX[1],4));
&pxor ("mm2",$i==1?"mm0":"mm1") if ($i>=0);
&movq ("mm0",&QWP(0,$inp)) if ($i<=0);
&movq (&QWP(-8,(@XX[0],$inp)),"mm2") if ($i==0);
&movd ($i>0?"mm1":"mm2",&DWP(0,$dat,$ty,4));
push (@XX,shift(@XX)) if ($i>=0);
}
} else {
$RC4_loop_mmx = sub {
my $i=shift;
&add ($yy,$tx);
&movz ($yy,&LB($yy)); # (*)
&psllq ("mm1",8*(($i-1)&7)) if (abs($i)!=1);
&mov ($ty,&DWP(0,$dat,$yy,4));
&mov (&DWP(0,$dat,$yy,4),$tx);
&mov (&DWP(0,$dat,$xx,4),$ty);
&inc ($xx);
&add ($ty,$tx);
&movz ($xx,&LB($xx)); # (*)
&movz ($ty,&LB($ty)); # (*)
&pxor ("mm2",$i==1?"mm0":"mm1") if ($i>=0);
&movq ("mm0",&QWP(0,$inp)) if ($i<=0);
&movq (&QWP(-8,($out,$inp)),"mm2") if ($i==0);
&mov ($tx,&DWP(0,$dat,$xx,4));
&movd ($i>0?"mm1":"mm2",&DWP(0,$dat,$ty,4));
# (*) This is the key to Core2 and Westmere performance.
# Whithout movz out-of-order execution logic confuses
# itself and fails to reorder loads and stores. Problem
# appears to be fixed in Sandy Bridge...
}
}
&external_label("OPENSSL_ia32cap_P");
# void RC4(RC4_KEY *key,size_t len,const unsigned char *inp,unsigned char *out);
&function_begin("RC4");
&mov ($dat,&wparam(0)); # load key schedule pointer
@ -94,11 +173,48 @@ sub RC4_loop {
&and ($ty,-4); # how many 4-byte chunks?
&jz (&label("loop1"));
&test ($ty,-8);
&mov (&wparam(3),$out); # $out as accumulator in these loops
&jz (&label("go4loop4"));
&picmeup($out,"OPENSSL_ia32cap_P");
&bt (&DWP(0,$out),26); # check SSE2 bit [could have been MMX]
&jnc (&label("go4loop4"));
&mov ($out,&wparam(3)) if (!$alt);
&movd ("mm7",&wparam(3)) if ($alt);
&and ($ty,-8);
&lea ($ty,&DWP(-8,$inp,$ty));
&mov (&wparam(2),$ty);
&mov (&DWP(-4,$dat),$ty); # save input+(len/8)*8-8
&$RC4_loop_mmx(-1);
&jmp(&label("loop_mmx_enter"));
&set_label("loop_mmx",16);
&$RC4_loop_mmx(0);
&set_label("loop_mmx_enter");
for ($i=1;$i<8;$i++) { &$RC4_loop_mmx($i); }
&cmp ($inp,&DWP(-4,$dat));
&lea ($inp,&DWP(8,$inp));
&jb (&label("loop_mmx"));
&movd ($out,"mm7") if ($alt);
&psllq ("mm1",56);
&pxor ("mm2","mm1");
&movq (&QWP(-8,$out,$inp),"mm2");
&emms ();
&cmp ($inp,&wparam(1)); # compare to input+len
&je (&label("done"));
&jmp (&label("loop1"));
&set_label("go4loop4",16);
&lea ($ty,&DWP(-4,$inp,$ty));
&mov (&wparam(2),$ty); # save input+(len/4)*4-4
&mov (&wparam(3),$out); # $out as accumulator in this loop
&set_label("loop4",16);
&set_label("loop4");
for ($i=0;$i<4;$i++) { RC4_loop($i); }
&ror ($out,8);
&xor ($out,&DWP(0,$inp));
@ -164,8 +280,6 @@ $idi="ebp";
$ido="ecx";
$idx="edx";
&external_label("OPENSSL_ia32cap_P");
# void RC4_set_key(RC4_KEY *key,int len,const unsigned char *data);
&function_begin("RC4_set_key");
&mov ($out,&wparam(0)); # load key
@ -254,14 +368,21 @@ $idx="edx";
&blindpop("eax");
&lea ("eax",&DWP(&label("opts")."-".&label("pic_point"),"eax"));
&picmeup("edx","OPENSSL_ia32cap_P");
&bt (&DWP(0,"edx"),20);
&jnc (&label("skip"));
&add ("eax",12);
&set_label("skip");
&mov ("edx",&DWP(0,"edx"));
&bt ("edx",20);
&jc (&label("1xchar"));
&bt ("edx",26);
&jnc (&label("ret"));
&add ("eax",25);
&ret ();
&set_label("1xchar");
&add ("eax",12);
&set_label("ret");
&ret ();
&set_label("opts",64);
&asciz ("rc4(4x,int)");
&asciz ("rc4(1x,char)");
&asciz ("rc4(8x,mmx)");
&asciz ("RC4 for x86, CRYPTOGAMS by <appro\@openssl.org>");
&align (64);
&function_end_B("RC4_options");