diff options
Diffstat (limited to 'openssl/crypto/rc4/asm/rc4-586.pl')
| -rw-r--r-- | openssl/crypto/rc4/asm/rc4-586.pl | 162 |
1 files changed, 151 insertions, 11 deletions
diff --git a/openssl/crypto/rc4/asm/rc4-586.pl b/openssl/crypto/rc4/asm/rc4-586.pl index 38a44a70e..5c9ac6ad2 100644 --- a/openssl/crypto/rc4/asm/rc4-586.pl +++ b/openssl/crypto/rc4/asm/rc4-586.pl @@ -28,6 +28,34 @@ # # <appro@fy.chalmers.se> +# May 2011 +# +# Optimize for Core2 and Westmere [and incidentally Opteron]. Current +# performance in cycles per processed byte (less is better) and +# improvement relative to previous version of this module is: +# +# Pentium 10.2 # original numbers +# Pentium III 7.8(*) +# Intel P4 7.5 +# +# Opteron 6.1/+20% # new MMX numbers +# Core2 5.3/+67%(**) +# Westmere 5.1/+94%(**) +# Sandy Bridge 5.0/+8% +# Atom 12.6/+6% +# +# (*) PIII can actually deliver 6.6 cycles per byte with MMX code, +# but this specific code performs poorly on Core2. And vice +# versa, below MMX/SSE code delivering 5.8/7.1 on Core2 performs +# poorly on PIII, at 8.0/14.5:-( As PIII is not a "hot" CPU +# [anymore], I chose to discard PIII-specific code path and opt +# for original IALU-only code, which is why MMX/SSE code path +# is guarded by SSE2 bit (see below), not MMX/SSE. +# (**) 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}","${dir}../../perlasm"); require "x86asm.pl"; @@ -62,6 +90,68 @@ sub RC4_loop { &$func ($out,&DWP(0,$dat,$ty,4)); } +if ($alt=0) { + # >20% faster on Atom and Sandy Bridge[!], 8% faster on Opteron, + # but ~40% slower on Core2 and Westmere... Attempt to add movz + # brings down Opteron by 25%, Atom and Sandy Bridge by 15%, yet + # on Core2 with movz it's almost 20% slower than below alternative + # code... Yes, it's a total mess... + my @XX=($xx,$out); + $RC4_loop_mmx = sub { # SSE actually... + my $i=shift; + my $j=$i<=0?0:$i>>1; + my $mm=$i<=0?"mm0":"mm".($i&1); + + &add (&LB($yy),&LB($tx)); + &lea (@XX[1],&DWP(1,@XX[0])); + &pxor ("mm2","mm0") if ($i==0); + &psllq ("mm1",8) if ($i==0); + &and (@XX[1],0xff); + &pxor ("mm0","mm0") if ($i<=0); + &mov ($ty,&DWP(0,$dat,$yy,4)); + &mov (&DWP(0,$dat,$yy,4),$tx); + &pxor ("mm1","mm2") if ($i==0); + &mov (&DWP(0,$dat,$XX[0],4),$ty); + &add (&LB($ty),&LB($tx)); + &movd (@XX[0],"mm7") if ($i==0); + &mov ($tx,&DWP(0,$dat,@XX[1],4)); + &pxor ("mm1","mm1") if ($i==1); + &movq ("mm2",&QWP(0,$inp)) if ($i==1); + &movq (&QWP(-8,(@XX[0],$inp)),"mm1") if ($i==0); + &pinsrw ($mm,&DWP(0,$dat,$ty,4),$j); + + push (@XX,shift(@XX)) if ($i>=0); + } +} else { + # Using pinsrw here improves performane on Intel CPUs by 2-3%, but + # brings down AMD by 7%... + $RC4_loop_mmx = sub { + my $i=shift; + + &add (&LB($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),$tx); + &mov (&DWP(0,$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 ($dat,&wparam(0)); # load key schedule pointer @@ -94,11 +184,56 @@ sub RC4_loop { &and ($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 (&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($i); } + &mov ($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,$inp)); + &jb (&label("loop_mmx")); + + if ($alt) { + &movd ($out,"mm7"); + &pxor ("mm2","mm0"); + &psllq ("mm1",8); + &pxor ("mm1","mm2"); + &movq (&QWP(-8,$out,$inp),"mm1"); + } else { + &psllq ("mm1",56); + &pxor ("mm2","mm1"); + &movq (&QWP(-8,$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)); @@ -151,7 +286,7 @@ sub RC4_loop { &set_label("done"); &dec (&LB($xx)); - &mov (&BP(-4,$dat),&LB($yy)); # save key->y + &mov (&DWP(-4,$dat),$yy); # save key->y &mov (&BP(-8,$dat),&LB($xx)); # save key->x &set_label("abort"); &function_end("RC4"); @@ -164,10 +299,8 @@ $idi="ebp"; $ido="ecx"; $idx="edx"; -&external_label("OPENSSL_ia32cap_P"); - # void RC4_set_key(RC4_KEY *key,int len,const unsigned char *data); -&function_begin("RC4_set_key"); +&function_begin("private_RC4_set_key"); &mov ($out,&wparam(0)); # load key &mov ($idi,&wparam(1)); # load len &mov ($inp,&wparam(2)); # load data @@ -245,7 +378,7 @@ $idx="edx"; &xor ("eax","eax"); &mov (&DWP(-8,$out),"eax"); # key->x=0; &mov (&DWP(-4,$out),"eax"); # key->y=0; -&function_end("RC4_set_key"); +&function_end("private_RC4_set_key"); # const char *RC4_options(void); &function_begin_B("RC4_options"); @@ -254,14 +387,21 @@ $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"); |