#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
# project. Rights for redistribution and usage in source and binary
# forms are granted according to the OpenSSL license.
# ====================================================================
#
# sha256/512_block procedure for x86_64.
#
# 40% improvement over compiler-generated code on Opteron. On EM64T
# sha256 was observed to run >80% faster and sha512 - >40%. No magical
# tricks, just straight implementation... I really wonder why gcc
# [being armed with inline assembler] fails to generate as fast code.
# The only thing which is cool about this module is that it's very
# same instruction sequence used for both SHA-256 and SHA-512. In
# former case the instructions operate on 32-bit operands, while in
# latter - on 64-bit ones. All I had to do is to get one flavor right,
# the other one passed the test right away:-)
#
# sha256_block runs in ~1005 cycles on Opteron, which gives you
# asymptotic performance of 64*1000/1005=63.7MBps times CPU clock
# frequency in GHz. sha512_block runs in ~1275 cycles, which results
# in 128*1000/1275=100MBps per GHz. Is there room for improvement?
# Well, if you compare it to IA-64 implementation, which maintains
# X[16] in register bank[!], tends to 4 instructions per CPU clock
# cycle and runs in 1003 cycles, 1275 is very good result for 3-way
# issue Opteron pipeline and X[16] maintained in memory. So that *if*
# there is a way to improve it, *then* the only way would be to try to
# offload X[16] updates to SSE unit, but that would require "deeper"
# loop unroll, which in turn would naturally cause size blow-up, not
# to mention increased complexity! And once again, only *if* it's
# actually possible to noticeably improve overall ILP, instruction
# level parallelism, on a given CPU implementation in this case.
#
# Special note on Intel EM64T. While Opteron CPU exhibits perfect
# perfromance ratio of 1.5 between 64- and 32-bit flavors [see above],
# [currently available] EM64T CPUs apparently are far from it. On the
# contrary, 64-bit version, sha512_block, is ~30% *slower* than 32-bit
# sha256_block:-( This is presumably because 64-bit shifts/rotates
# apparently are not atomic instructions, but implemented in microcode.
$output=shift;
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
die "can't locate x86_64-xlate.pl";
open STDOUT,"| $^X $xlate $output";
if ($output =~ /512/) {
$func="sha512_block_data_order";
$TABLE="K512";
$SZ=8;
@ROT=($A,$B,$C,$D,$E,$F,$G,$H)=("%rax","%rbx","%rcx","%rdx",
"%r8", "%r9", "%r10","%r11");
($T1,$a0,$a1,$a2)=("%r12","%r13","%r14","%r15");
@Sigma0=(28,34,39);
@Sigma1=(14,18,41);
@sigma0=(1, 8, 7);
@sigma1=(19,61, 6);
$rounds=80;
} else {
$func="sha256_block_data_order";
$TABLE="K256";
$SZ=4;
@ROT=($A,$B,$C,$D,$E,$F,$G,$H)=("%eax","%ebx","%ecx","%edx",
"%r8d","%r9d","%r10d","%r11d");
($T1,$a0,$a1,$a2)=("%r12d","%r13d","%r14d","%r15d");
@Sigma0=( 2,13,22);
@Sigma1=( 6,11,25);
@sigma0=( 7,18, 3);
@sigma1=(17,19,10);
$rounds=64;
}
$ctx="%rdi"; # 1st arg
$round="%rdi"; # zaps $ctx
$inp="%rsi"; # 2nd arg
$Tbl="%rbp";
$_ctx="16*$SZ+0*8(%rsp)";
$_inp="16*$SZ+1*8(%rsp)";
$_end="16*$SZ+2*8(%rsp)";
$_rsp="16*$SZ+3*8(%rsp)";
$framesz="16*$SZ+4*8";
sub ROUND_00_15()
{ my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
$code.=<<___;
mov $e,$a0
mov $e,$a1
mov $f,$a2
ror \$$Sigma1[0],$a0
ror \$$Sigma1[1],$a1
xor $g,$a2 # f^g
xor $a1,$a0
ror \$`$Sigma1[2]-$Sigma1[1]`,$a1
and $e,$a2 # (f^g)&e
mov $T1,`$SZ*($i&0xf)`(%rsp)
xor $a1,$a0 # Sigma1(e)
xor $g,$a2 # Ch(e,f,g)=((f^g)&e)^g
add $h,$T1 # T1+=h
mov $a,$h
add $a0,$T1 # T1+=Sigma1(e)
add $a2,$T1 # T1+=Ch(e,f,g)
mov $a,$a0
mov $a,$a1
ror \$$Sigma0[0],$h
ror \$$Sigma0[1],$a0
mov $a,$a2
add ($Tbl,$round,$SZ),$T1 # T1+=K[round]
xor $a0,$h
ror \$`$Sigma0[2]-$Sigma0[1]`,$a0
or $c,$a1 # a|c
xor $a0,$h # h=Sigma0(a)
and $c,$a2 # a&c
add $T1,$d # d+=T1
and $b,$a1 # (a|c)&b
add $T1,$h # h+=T1
or $a2,$a1 # Maj(a,b,c)=((a|c)&b)|(a&c)
lea 1($round),$round # round++
add $a1,$h # h+=Maj(a,b,c)
___
}
sub ROUND_16_XX()
{ my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
$code.=<<___;
mov `$SZ*(($i+1)&0xf)`(%rsp),$a0
mov `$SZ*(($i+14)&0xf)`(%rsp),$T1
mov $a0,$a2
shr \$$sigma0[2],$a0
ror \$$sigma0[0],$a2
xor $a2,$a0
ror \$`$sigma0[1]-$sigma0[0]`,$a2
xor $a2,$a0 # sigma0(X[(i+1)&0xf])
mov $T1,$a1
shr \$$sigma1[2],$T1
ror \$$sigma1[0],$a1
xor $a1,$T1
ror \$`$sigma1[1]-$sigma1[0]`,$a1
xor $a1,$T1 # sigma1(X[(i+14)&0xf])
add $a0,$T1
add `$SZ*(($i+9)&0xf)`(%rsp),$T1
add `$SZ*($i&0xf)`(%rsp),$T1
___
&ROUND_00_15(@_);
}
$code=<<___;
.text
.globl $func
.type $func,\@function,4
.align 16
$func:
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
mov %rsp,%rbp # copy %rsp
shl \$4,%rdx # num*16
sub \$$framesz,%rsp
lea ($inp,%rdx,$SZ),%rdx # inp+num*16*$SZ
and \$-64,%rsp # align stack frame
mov $ctx,$_ctx # save ctx, 1st arg
mov $inp,$_inp # save inp, 2nd arh
mov %rdx,$_end # save end pointer, "3rd" arg
mov %rbp,$_rsp # save copy of %rsp
.picmeup $Tbl
lea $TABLE-.($Tbl),$Tbl
mov $SZ*0($ctx),$A
mov $SZ*1($ctx),$B
mov $SZ*2($ctx),$C
mov $SZ*3($ctx),$D
mov $SZ*4($ctx),$E
mov $SZ*5($ctx),$F
mov $SZ*6($ctx),$G
mov $SZ*7($ctx),$H
jmp .Lloop
.align 16
.Lloop:
xor $round,$round
___
for($i=0;$i<16;$i++) {
$code.=" mov $SZ*$i($inp),$T1\n";
$code.=" bswap $T1\n";
&ROUND_00_15($i,@ROT);
unshift(@ROT,pop(@ROT));
}
$code.=<<___;
jmp .Lrounds_16_xx
.align 16
.Lrounds_16_xx:
___
for(;$i<32;$i++) {
&ROUND_16_XX($i,@ROT);
unshift(@ROT,pop(@ROT));
}
$code.=<<___;
cmp \$$rounds,$round
jb .Lrounds_16_xx
mov $_ctx,$ctx
lea 16*$SZ($inp),$inp
add $SZ*0($ctx),$A
add $SZ*1($ctx),$B
add $SZ*2($ctx),$C
add $SZ*3($ctx),$D
add $SZ*4($ctx),$E
add $SZ*5($ctx),$F
add $SZ*6($ctx),$G
add $SZ*7($ctx),$H
cmp $_end,$inp
mov $A,$SZ*0($ctx)
mov $B,$SZ*1($ctx)
mov $C,$SZ*2($ctx)
mov $D,$SZ*3($ctx)
mov $E,$SZ*4($ctx)
mov $F,$SZ*5($ctx)
mov $G,$SZ*6($ctx)
mov $H,$SZ*7($ctx)
jb .Lloop
mov $_rsp,%rsp
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
ret
.size $func,.-$func
___
if ($SZ==4) {
$code.=<<___;
.align 64
.type $TABLE,\@object
$TABLE:
.long 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
.long 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
.long 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
.long 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
.long 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
.long 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
.long 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
.long 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
.long 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
.long 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
.long 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
.long 0xd192e819,0xd6990624,0xf40e3585,0x106aa070
.long 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
.long 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
.long 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
.long 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
___
} else {
$code.=<<___;
.align 64
.type $TABLE,\@object
$TABLE:
.quad 0x428a2f98d728ae22,0x7137449123ef65cd
.quad 0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc
.quad 0x3956c25bf348b538,0x59f111f1b605d019
.quad 0x923f82a4af194f9b,0xab1c5ed5da6d8118
.quad 0xd807aa98a3030242,0x12835b0145706fbe
.quad 0x243185be4ee4b28c,0x550c7dc3d5ffb4e2
.quad 0x72be5d74f27b896f,0x80deb1fe3b1696b1
.quad 0x9bdc06a725c71235,0xc19bf174cf692694
.quad 0xe49b69c19ef14ad2,0xefbe4786384f25e3
.quad 0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65
.quad 0x2de92c6f592b0275,0x4a7484aa6ea6e483
.quad 0x5cb0a9dcbd41fbd4,0x76f988da831153b5
.quad 0x983e5152ee66dfab,0xa831c66d2db43210
.quad 0xb00327c898fb213f,0xbf597fc7beef0ee4
.quad 0xc6e00bf33da88fc2,0xd5a79147930aa725
.quad 0x06ca6351e003826f,0x142929670a0e6e70
.quad 0x27b70a8546d22ffc,0x2e1b21385c26c926
.quad 0x4d2c6dfc5ac42aed,0x53380d139d95b3df
.quad 0x650a73548baf63de,0x766a0abb3c77b2a8
.quad 0x81c2c92e47edaee6,0x92722c851482353b
.quad 0xa2bfe8a14cf10364,0xa81a664bbc423001
.quad 0xc24b8b70d0f89791,0xc76c51a30654be30
.quad 0xd192e819d6ef5218,0xd69906245565a910
.quad 0xf40e35855771202a,0x106aa07032bbd1b8
.quad 0x19a4c116b8d2d0c8,0x1e376c085141ab53
.quad 0x2748774cdf8eeb99,0x34b0bcb5e19b48a8
.quad 0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb
.quad 0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3
.quad 0x748f82ee5defb2fc,0x78a5636f43172f60
.quad 0x84c87814a1f0ab72,0x8cc702081a6439ec
.quad 0x90befffa23631e28,0xa4506cebde82bde9
.quad 0xbef9a3f7b2c67915,0xc67178f2e372532b
.quad 0xca273eceea26619c,0xd186b8c721c0c207
.quad 0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178
.quad 0x06f067aa72176fba,0x0a637dc5a2c898a6
.quad 0x113f9804bef90dae,0x1b710b35131c471b
.quad 0x28db77f523047d84,0x32caab7b40c72493
.quad 0x3c9ebe0a15c9bebc,0x431d67c49c100d4c
.quad 0x4cc5d4becb3e42b6,0x597f299cfc657e2a
.quad 0x5fcb6fab3ad6faec,0x6c44198c4a475817
___
}
$code =~ s/\`([^\`]*)\`/eval $1/gem;
print $code;
close STDOUT;