282 lines
6 KiB
Perl
282 lines
6 KiB
Perl
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#!/usr/bin/env perl
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#
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# ====================================================================
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# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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#
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# May 2011
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#
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# The module implements bn_GF2m_mul_2x2 polynomial multiplication used
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# in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
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# the time being... Except that it has two code paths: code suitable
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# for any x86_64 CPU and PCLMULQDQ one suitable for Westmere and
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# later. Improvement varies from one benchmark and <20>-arch to another.
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# Vanilla code path is at most 20% faster than compiler-generated code
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# [not very impressive], while PCLMULQDQ - whole 85%-160% better on
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# 163- and 571-bit ECDH benchmarks on Intel CPUs. Keep in mind that
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# these coefficients are not ones for bn_GF2m_mul_2x2 itself, as not
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# all CPU time is burnt in it...
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$flavour = shift;
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$output = shift;
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if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
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$win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
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( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
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die "can't locate x86_64-xlate.pl";
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open STDOUT,"| $^X $xlate $flavour $output";
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($lo,$hi)=("%rax","%rdx"); $a=$lo;
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($i0,$i1)=("%rsi","%rdi");
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($t0,$t1)=("%rbx","%rcx");
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($b,$mask)=("%rbp","%r8");
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($a1,$a2,$a4,$a8,$a12,$a48)=map("%r$_",(9..15));
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($R,$Tx)=("%xmm0","%xmm1");
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$code.=<<___;
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.text
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.type _mul_1x1,\@abi-omnipotent
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.align 16
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_mul_1x1:
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sub \$128+8,%rsp
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mov \$-1,$a1
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lea ($a,$a),$i0
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shr \$3,$a1
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lea (,$a,4),$i1
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and $a,$a1 # a1=a&0x1fffffffffffffff
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lea (,$a,8),$a8
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sar \$63,$a # broadcast 63rd bit
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lea ($a1,$a1),$a2
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sar \$63,$i0 # broadcast 62nd bit
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lea (,$a1,4),$a4
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and $b,$a
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sar \$63,$i1 # boardcast 61st bit
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mov $a,$hi # $a is $lo
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shl \$63,$lo
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and $b,$i0
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shr \$1,$hi
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mov $i0,$t1
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shl \$62,$i0
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and $b,$i1
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shr \$2,$t1
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xor $i0,$lo
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mov $i1,$t0
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shl \$61,$i1
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xor $t1,$hi
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shr \$3,$t0
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xor $i1,$lo
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xor $t0,$hi
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mov $a1,$a12
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movq \$0,0(%rsp) # tab[0]=0
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xor $a2,$a12 # a1^a2
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mov $a1,8(%rsp) # tab[1]=a1
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mov $a4,$a48
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mov $a2,16(%rsp) # tab[2]=a2
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xor $a8,$a48 # a4^a8
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mov $a12,24(%rsp) # tab[3]=a1^a2
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xor $a4,$a1
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mov $a4,32(%rsp) # tab[4]=a4
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xor $a4,$a2
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mov $a1,40(%rsp) # tab[5]=a1^a4
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xor $a4,$a12
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mov $a2,48(%rsp) # tab[6]=a2^a4
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xor $a48,$a1 # a1^a4^a4^a8=a1^a8
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mov $a12,56(%rsp) # tab[7]=a1^a2^a4
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xor $a48,$a2 # a2^a4^a4^a8=a1^a8
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mov $a8,64(%rsp) # tab[8]=a8
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xor $a48,$a12 # a1^a2^a4^a4^a8=a1^a2^a8
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mov $a1,72(%rsp) # tab[9]=a1^a8
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xor $a4,$a1 # a1^a8^a4
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mov $a2,80(%rsp) # tab[10]=a2^a8
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xor $a4,$a2 # a2^a8^a4
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mov $a12,88(%rsp) # tab[11]=a1^a2^a8
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xor $a4,$a12 # a1^a2^a8^a4
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mov $a48,96(%rsp) # tab[12]=a4^a8
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mov $mask,$i0
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mov $a1,104(%rsp) # tab[13]=a1^a4^a8
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and $b,$i0
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mov $a2,112(%rsp) # tab[14]=a2^a4^a8
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shr \$4,$b
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mov $a12,120(%rsp) # tab[15]=a1^a2^a4^a8
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mov $mask,$i1
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and $b,$i1
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shr \$4,$b
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movq (%rsp,$i0,8),$R # half of calculations is done in SSE2
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mov $mask,$i0
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and $b,$i0
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shr \$4,$b
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___
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for ($n=1;$n<8;$n++) {
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$code.=<<___;
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mov (%rsp,$i1,8),$t1
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mov $mask,$i1
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mov $t1,$t0
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shl \$`8*$n-4`,$t1
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and $b,$i1
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movq (%rsp,$i0,8),$Tx
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shr \$`64-(8*$n-4)`,$t0
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xor $t1,$lo
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pslldq \$$n,$Tx
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mov $mask,$i0
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shr \$4,$b
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xor $t0,$hi
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and $b,$i0
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shr \$4,$b
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pxor $Tx,$R
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___
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}
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$code.=<<___;
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mov (%rsp,$i1,8),$t1
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mov $t1,$t0
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shl \$`8*$n-4`,$t1
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movq $R,$i0
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shr \$`64-(8*$n-4)`,$t0
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xor $t1,$lo
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psrldq \$8,$R
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xor $t0,$hi
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movq $R,$i1
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xor $i0,$lo
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xor $i1,$hi
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add \$128+8,%rsp
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ret
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.size _mul_1x1,.-_mul_1x1
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___
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($rp,$a1,$a0,$b1,$b0) = $win64? ("%rcx","%rdx","%r8", "%r9","%r10") : # Win64 order
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("%rdi","%rsi","%rdx","%rcx","%r8"); # Unix order
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$code.=<<___;
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.extern OPENSSL_ia32cap_P
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.globl bn_GF2m_mul_2x2
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.type bn_GF2m_mul_2x2,\@abi-omnipotent
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.align 16
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bn_GF2m_mul_2x2:
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mov OPENSSL_ia32cap_P(%rip),%rax
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bt \$33,%rax
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jnc .Lvanilla
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movq $a1,%xmm0
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movq $b1,%xmm1
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movq $a0,%xmm2
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___
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$code.=<<___ if ($win64);
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movq 40(%rsp),%xmm3
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___
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$code.=<<___ if (!$win64);
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movq $b0,%xmm3
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___
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$code.=<<___;
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movdqa %xmm0,%xmm4
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movdqa %xmm1,%xmm5
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pclmulqdq \$0,%xmm1,%xmm0 # a1<61>b1
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pxor %xmm2,%xmm4
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pxor %xmm3,%xmm5
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pclmulqdq \$0,%xmm3,%xmm2 # a0<61>b0
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pclmulqdq \$0,%xmm5,%xmm4 # (a0+a1)<29>(b0+b1)
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xorps %xmm0,%xmm4
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xorps %xmm2,%xmm4
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movdqa %xmm4,%xmm5
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pslldq \$8,%xmm4
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psrldq \$8,%xmm5
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pxor %xmm4,%xmm2
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pxor %xmm5,%xmm0
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movdqu %xmm2,0($rp)
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movdqu %xmm0,16($rp)
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ret
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.align 16
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.Lvanilla:
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lea -8*17(%rsp),%rsp
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___
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$code.=<<___ if ($win64);
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mov `8*17+40`(%rsp),$b0
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mov %rdi,8*15(%rsp)
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mov %rsi,8*16(%rsp)
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___
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$code.=<<___;
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mov %r14,8*10(%rsp)
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mov %r13,8*11(%rsp)
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mov %r12,8*12(%rsp)
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mov %rbp,8*13(%rsp)
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mov %rbx,8*14(%rsp)
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.Lbody:
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mov $rp,32(%rsp) # save the arguments
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mov $a1,40(%rsp)
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mov $a0,48(%rsp)
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mov $b1,56(%rsp)
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mov $b0,64(%rsp)
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mov \$0xf,$mask
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mov $a1,$a
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mov $b1,$b
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call _mul_1x1 # a1<61>b1
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mov $lo,16(%rsp)
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mov $hi,24(%rsp)
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mov 48(%rsp),$a
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mov 64(%rsp),$b
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call _mul_1x1 # a0<61>b0
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mov $lo,0(%rsp)
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mov $hi,8(%rsp)
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mov 40(%rsp),$a
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mov 56(%rsp),$b
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xor 48(%rsp),$a
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xor 64(%rsp),$b
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call _mul_1x1 # (a0+a1)<29>(b0+b1)
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___
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@r=("%rbx","%rcx","%rdi","%rsi");
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$code.=<<___;
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mov 0(%rsp),@r[0]
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mov 8(%rsp),@r[1]
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mov 16(%rsp),@r[2]
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mov 24(%rsp),@r[3]
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mov 32(%rsp),%rbp
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xor $hi,$lo
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xor @r[1],$hi
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xor @r[0],$lo
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mov @r[0],0(%rbp)
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xor @r[2],$hi
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mov @r[3],24(%rbp)
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xor @r[3],$lo
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xor @r[3],$hi
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xor $hi,$lo
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mov $hi,16(%rbp)
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mov $lo,8(%rbp)
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mov 8*10(%rsp),%r14
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mov 8*11(%rsp),%r13
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mov 8*12(%rsp),%r12
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mov 8*13(%rsp),%rbp
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mov 8*14(%rsp),%rbx
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___
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$code.=<<___ if ($win64);
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mov 8*15(%rsp),%rdi
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mov 8*16(%rsp),%rsi
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___
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$code.=<<___;
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lea 8*17(%rsp),%rsp
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ret
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.size bn_GF2m_mul_2x2,.-bn_GF2m_mul_2x2
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.asciz "GF(2^m) Multiplication for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
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___
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$code =~ s/\`([^\`]*)\`/eval($1)/gem;
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print $code;
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close STDOUT;
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