crypto/modes/asm/ghash-x86_64.pl - platform/external/openssl - Git at Google

 #!/usr/bin/env perl
 #
 # ====================================================================
 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
 # project. The module is, however, dual licensed under OpenSSL and
 # CRYPTOGAMS licenses depending on where you obtain it. For further
 # details see http://www.openssl.org/~appro/cryptogams/.
 # ====================================================================
 #
 # March, June 2010
 #
 # The module implements "4-bit" GCM GHASH function and underlying
 # single multiplication operation in GF(2^128). "4-bit" means that
 # it uses 256 bytes per-key table [+128 bytes shared table]. GHASH
 # function features so called "528B" variant utilizing additional
 # 256+16 bytes of per-key storage [+512 bytes shared table].
 # Performance results are for this streamed GHASH subroutine and are
 # expressed in cycles per processed byte, less is better:
 #
 #		gcc 3.4.x(*)	assembler
 #
 # P4		28.6		14.0		+100%
 # Opteron	19.3		7.7		+150%
 # Core2		17.8		8.1(**)		+120%
 #
 # (*)	comparison is not completely fair, because C results are
 #	for vanilla "256B" implementation, while assembler results
 #	are for "528B";-)
 # (**)	it's mystery [to me] why Core2 result is not same as for
 #	Opteron;

 # May 2010
 #
 # Add PCLMULQDQ version performing at 2.02 cycles per processed byte.
 # See ghash-x86.pl for background information and details about coding
 # techniques.
 #
 # Special thanks to David Woodhouse <dwmw2@infradead.org> for
 # providing access to a Westmere-based system on behalf of Intel
 # Open Source Technology Centre.

 $flavour = shift;
 $output  = shift;
 if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }

 $win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);

 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $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 OUT,"| \"$^X\" $xlate $flavour $output";
 *STDOUT=*OUT;

 # common register layout
 $nlo="%rax";
 $nhi="%rbx";
 $Zlo="%r8";
 $Zhi="%r9";
 $tmp="%r10";
 $rem_4bit = "%r11";

 $Xi="%rdi";
 $Htbl="%rsi";

 # per-function register layout
 $cnt="%rcx";
 $rem="%rdx";

 sub LB() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/	or
 			$r =~ s/%[er]([sd]i)/%\1l/	or
 			$r =~ s/%[er](bp)/%\1l/		or
 			$r =~ s/%(r[0-9]+)[d]?/%\1b/;   $r; }

 sub AUTOLOAD()		# thunk [simplified] 32-bit style perlasm
 { my $opcode = $AUTOLOAD; $opcode =~ s/.*:://;
   my $arg = pop;
     $arg = "\$$arg" if ($arg*1 eq $arg);
     $code .= "\t$opcode\t".join(',',$arg,reverse @_)."\n";
 }

 { my $N;
   sub loop() {
   my $inp = shift;

 	$N++;
 $code.=<<___;
 	xor	$nlo,$nlo
 	xor	$nhi,$nhi
 	mov	`&LB("$Zlo")`,`&LB("$nlo")`
 	mov	`&LB("$Zlo")`,`&LB("$nhi")`
 	shl	\$4,`&LB("$nlo")`
 	mov	\$14,$cnt
 	mov	8($Htbl,$nlo),$Zlo
 	mov	($Htbl,$nlo),$Zhi
 	and	\$0xf0,`&LB("$nhi")`
 	mov	$Zlo,$rem
 	jmp	.Loop$N

 .align	16
 .Loop$N:
 	shr	\$4,$Zlo
 	and	\$0xf,$rem
 	mov	$Zhi,$tmp
 	mov	($inp,$cnt),`&LB("$nlo")`
 	shr	\$4,$Zhi
 	xor	8($Htbl,$nhi),$Zlo
 	shl	\$60,$tmp
 	xor	($Htbl,$nhi),$Zhi
 	mov	`&LB("$nlo")`,`&LB("$nhi")`
 	xor	($rem_4bit,$rem,8),$Zhi
 	mov	$Zlo,$rem
 	shl	\$4,`&LB("$nlo")`
 	xor	$tmp,$Zlo
 	dec	$cnt
 	js	.Lbreak$N

 	shr	\$4,$Zlo
 	and	\$0xf,$rem
 	mov	$Zhi,$tmp
 	shr	\$4,$Zhi
 	xor	8($Htbl,$nlo),$Zlo
 	shl	\$60,$tmp
 	xor	($Htbl,$nlo),$Zhi
 	and	\$0xf0,`&LB("$nhi")`
 	xor	($rem_4bit,$rem,8),$Zhi
 	mov	$Zlo,$rem
 	xor	$tmp,$Zlo
 	jmp	.Loop$N

 .align	16
 .Lbreak$N:
 	shr	\$4,$Zlo
 	and	\$0xf,$rem
 	mov	$Zhi,$tmp
 	shr	\$4,$Zhi
 	xor	8($Htbl,$nlo),$Zlo
 	shl	\$60,$tmp
 	xor	($Htbl,$nlo),$Zhi
 	and	\$0xf0,`&LB("$nhi")`
 	xor	($rem_4bit,$rem,8),$Zhi
 	mov	$Zlo,$rem
 	xor	$tmp,$Zlo

 	shr	\$4,$Zlo
 	and	\$0xf,$rem
 	mov	$Zhi,$tmp
 	shr	\$4,$Zhi
 	xor	8($Htbl,$nhi),$Zlo
 	shl	\$60,$tmp
 	xor	($Htbl,$nhi),$Zhi
 	xor	$tmp,$Zlo
 	xor	($rem_4bit,$rem,8),$Zhi

 	bswap	$Zlo
 	bswap	$Zhi
 ___
 }}

 $code=<<___;
 .text

 .globl	gcm_gmult_4bit
 .type	gcm_gmult_4bit,\@function,2
 .align	16
 gcm_gmult_4bit:
 	push	%rbx
 	push	%rbp		# %rbp and %r12 are pushed exclusively in
 	push	%r12		# order to reuse Win64 exception handler...
 .Lgmult_prologue:

 	movzb	15($Xi),$Zlo
 	lea	.Lrem_4bit(%rip),$rem_4bit
 ___
 	&loop	($Xi);
 $code.=<<___;
 	mov	$Zlo,8($Xi)
 	mov	$Zhi,($Xi)

 	mov	16(%rsp),%rbx
 	lea	24(%rsp),%rsp
 .Lgmult_epilogue:
 	ret
 .size	gcm_gmult_4bit,.-gcm_gmult_4bit
 ___

 # per-function register layout
 $inp="%rdx";
 $len="%rcx";
 $rem_8bit=$rem_4bit;

 $code.=<<___;
 .globl	gcm_ghash_4bit
 .type	gcm_ghash_4bit,\@function,4
 .align	16
 gcm_ghash_4bit:
 	push	%rbx
 	push	%rbp
 	push	%r12
 	push	%r13
 	push	%r14
 	push	%r15
 	sub	\$280,%rsp
 .Lghash_prologue:
 	mov	$inp,%r14		# reassign couple of args
 	mov	$len,%r15
 ___
 { my $inp="%r14";
   my $dat="%edx";
   my $len="%r15";
   my @nhi=("%ebx","%ecx");
   my @rem=("%r12","%r13");
   my $Hshr4="%rbp";

 	&sub	($Htbl,-128);		# size optimization
 	&lea	($Hshr4,"16+128(%rsp)");
 	{ my @lo =($nlo,$nhi);
           my @hi =($Zlo,$Zhi);

 	  &xor	($dat,$dat);
 	  for ($i=0,$j=-2;$i<18;$i++,$j++) {
 	    &mov	("$j(%rsp)",&LB($dat))		if ($i>1);
 	    &or		($lo[0],$tmp)			if ($i>1);
 	    &mov	(&LB($dat),&LB($lo[1]))		if ($i>0 && $i<17);
 	    &shr	($lo[1],4)			if ($i>0 && $i<17);
 	    &mov	($tmp,$hi[1])			if ($i>0 && $i<17);
 	    &shr	($hi[1],4)			if ($i>0 && $i<17);
 	    &mov	("8*$j($Hshr4)",$hi[0])		if ($i>1);
 	    &mov	($hi[0],"16*$i+0-128($Htbl)")	if ($i<16);
 	    &shl	(&LB($dat),4)			if ($i>0 && $i<17);
 	    &mov	("8*$j-128($Hshr4)",$lo[0])	if ($i>1);
 	    &mov	($lo[0],"16*$i+8-128($Htbl)")	if ($i<16);
 	    &shl	($tmp,60)			if ($i>0 && $i<17);

 	    push	(@lo,shift(@lo));
 	    push	(@hi,shift(@hi));
 	  }
 	}
 	&add	($Htbl,-128);
 	&mov	($Zlo,"8($Xi)");
 	&mov	($Zhi,"0($Xi)");
 	&add	($len,$inp);		# pointer to the end of data
 	&lea	($rem_8bit,".Lrem_8bit(%rip)");
 	&jmp	(".Louter_loop");

 $code.=".align	16\n.Louter_loop:\n";
 	&xor	($Zhi,"($inp)");
 	&mov	("%rdx","8($inp)");
 	&lea	($inp,"16($inp)");
 	&xor	("%rdx",$Zlo);
 	&mov	("($Xi)",$Zhi);
 	&mov	("8($Xi)","%rdx");
 	&shr	("%rdx",32);

 	&xor	($nlo,$nlo);
 	&rol	($dat,8);
 	&mov	(&LB($nlo),&LB($dat));
 	&movz	($nhi[0],&LB($dat));
 	&shl	(&LB($nlo),4);
 	&shr	($nhi[0],4);

 	for ($j=11,$i=0;$i<15;$i++) {
 	    &rol	($dat,8);
 	    &xor	($Zlo,"8($Htbl,$nlo)")			if ($i>0);
 	    &xor	($Zhi,"($Htbl,$nlo)")			if ($i>0);
 	    &mov	($Zlo,"8($Htbl,$nlo)")			if ($i==0);
 	    &mov	($Zhi,"($Htbl,$nlo)")			if ($i==0);

 	    &mov	(&LB($nlo),&LB($dat));
 	    &xor	($Zlo,$tmp)				if ($i>0);
 	    &movzw	($rem[1],"($rem_8bit,$rem[1],2)")	if ($i>0);

 	    &movz	($nhi[1],&LB($dat));
 	    &shl	(&LB($nlo),4);
 	    &movzb	($rem[0],"(%rsp,$nhi[0])");

 	    &shr	($nhi[1],4)				if ($i<14);
 	    &and	($nhi[1],0xf0)				if ($i==14);
 	    &shl	($rem[1],48)				if ($i>0);
 	    &xor	($rem[0],$Zlo);

 	    &mov	($tmp,$Zhi);
 	    &xor	($Zhi,$rem[1])				if ($i>0);
 	    &shr	($Zlo,8);

 	    &movz	($rem[0],&LB($rem[0]));
 	    &mov	($dat,"$j($Xi)")			if (--$j%4==0);
 	    &shr	($Zhi,8);

 	    &xor	($Zlo,"-128($Hshr4,$nhi[0],8)");
 	    &shl	($tmp,56);
 	    &xor	($Zhi,"($Hshr4,$nhi[0],8)");

 	    unshift	(@nhi,pop(@nhi));		# "rotate" registers
 	    unshift	(@rem,pop(@rem));
 	}
 	&movzw	($rem[1],"($rem_8bit,$rem[1],2)");
 	&xor	($Zlo,"8($Htbl,$nlo)");
 	&xor	($Zhi,"($Htbl,$nlo)");

 	&shl	($rem[1],48);
 	&xor	($Zlo,$tmp);

 	&xor	($Zhi,$rem[1]);
 	&movz	($rem[0],&LB($Zlo));
 	&shr	($Zlo,4);

 	&mov	($tmp,$Zhi);
 	&shl	(&LB($rem[0]),4);
 	&shr	($Zhi,4);

 	&xor	($Zlo,"8($Htbl,$nhi[0])");
 	&movzw	($rem[0],"($rem_8bit,$rem[0],2)");
 	&shl	($tmp,60);

 	&xor	($Zhi,"($Htbl,$nhi[0])");
 	&xor	($Zlo,$tmp);
 	&shl	($rem[0],48);

 	&bswap	($Zlo);
 	&xor	($Zhi,$rem[0]);

 	&bswap	($Zhi);
 	&cmp	($inp,$len);
 	&jb	(".Louter_loop");
 }
 $code.=<<___;
 	mov	$Zlo,8($Xi)
 	mov	$Zhi,($Xi)

 	lea	280(%rsp),%rsi
 	mov	0(%rsi),%r15
 	mov	8(%rsi),%r14
 	mov	16(%rsi),%r13
 	mov	24(%rsi),%r12
 	mov	32(%rsi),%rbp
 	mov	40(%rsi),%rbx
 	lea	48(%rsi),%rsp
 .Lghash_epilogue:
 	ret
 .size	gcm_ghash_4bit,.-gcm_ghash_4bit
 ___

 ######################################################################
 # PCLMULQDQ version.

 @_4args=$win64?	("%rcx","%rdx","%r8", "%r9") :	# Win64 order
 		("%rdi","%rsi","%rdx","%rcx");	# Unix order

 ($Xi,$Xhi)=("%xmm0","%xmm1");	$Hkey="%xmm2";
 ($T1,$T2,$T3)=("%xmm3","%xmm4","%xmm5");

 sub clmul64x64_T2 {	# minimal register pressure
 my ($Xhi,$Xi,$Hkey,$modulo)=@_;

 $code.=<<___ if (!defined($modulo));
 	movdqa		$Xi,$Xhi		#
 	pshufd		\$0b01001110,$Xi,$T1
 	pshufd		\$0b01001110,$Hkey,$T2
 	pxor		$Xi,$T1			#
 	pxor		$Hkey,$T2
 ___
 $code.=<<___;
 	pclmulqdq	\$0x00,$Hkey,$Xi	#######
 	pclmulqdq	\$0x11,$Hkey,$Xhi	#######
 	pclmulqdq	\$0x00,$T2,$T1		#######
 	pxor		$Xi,$T1			#
 	pxor		$Xhi,$T1		#

 	movdqa		$T1,$T2			#
 	psrldq		\$8,$T1
 	pslldq		\$8,$T2			#
 	pxor		$T1,$Xhi
 	pxor		$T2,$Xi			#
 ___
 }

 sub reduction_alg9 {	# 17/13 times faster than Intel version
 my ($Xhi,$Xi) = @_;

 $code.=<<___;
 	# 1st phase
 	movdqa		$Xi,$T1			#
 	psllq		\$1,$Xi
 	pxor		$T1,$Xi			#
 	psllq		\$5,$Xi			#
 	pxor		$T1,$Xi			#
 	psllq		\$57,$Xi		#
 	movdqa		$Xi,$T2			#
 	pslldq		\$8,$Xi
 	psrldq		\$8,$T2			#
 	pxor		$T1,$Xi
 	pxor		$T2,$Xhi		#

 	# 2nd phase
 	movdqa		$Xi,$T2
 	psrlq		\$5,$Xi
 	pxor		$T2,$Xi			#
 	psrlq		\$1,$Xi			#
 	pxor		$T2,$Xi			#
 	pxor		$Xhi,$T2
 	psrlq		\$1,$Xi			#
 	pxor		$T2,$Xi			#
 ___
 }

 { my ($Htbl,$Xip)=@_4args;

 $code.=<<___;
 .globl	gcm_init_clmul
 .type	gcm_init_clmul,\@abi-omnipotent
 .align	16
 gcm_init_clmul:
 	movdqu		($Xip),$Hkey
 	pshufd		\$0b01001110,$Hkey,$Hkey	# dword swap

 	# <<1 twist
 	pshufd		\$0b11111111,$Hkey,$T2	# broadcast uppermost dword
 	movdqa		$Hkey,$T1
 	psllq		\$1,$Hkey
 	pxor		$T3,$T3			#
 	psrlq		\$63,$T1
 	pcmpgtd		$T2,$T3			# broadcast carry bit
 	pslldq		\$8,$T1
 	por		$T1,$Hkey		# H<<=1

 	# magic reduction
 	pand		.L0x1c2_polynomial(%rip),$T3
 	pxor		$T3,$Hkey		# if(carry) H^=0x1c2_polynomial

 	# calculate H^2
 	movdqa		$Hkey,$Xi
 ___
 	&clmul64x64_T2	($Xhi,$Xi,$Hkey);
 	&reduction_alg9	($Xhi,$Xi);
 $code.=<<___;
 	movdqu		$Hkey,($Htbl)		# save H
 	movdqu		$Xi,16($Htbl)		# save H^2
 	ret
 .size	gcm_init_clmul,.-gcm_init_clmul
 ___
 }

 { my ($Xip,$Htbl)=@_4args;

 $code.=<<___;
 .globl	gcm_gmult_clmul
 .type	gcm_gmult_clmul,\@abi-omnipotent
 .align	16
 gcm_gmult_clmul:
 	movdqu		($Xip),$Xi
 	movdqa		.Lbswap_mask(%rip),$T3
 	movdqu		($Htbl),$Hkey
 	pshufb		$T3,$Xi
 ___
 	&clmul64x64_T2	($Xhi,$Xi,$Hkey);
 	&reduction_alg9	($Xhi,$Xi);
 $code.=<<___;
 	pshufb		$T3,$Xi
 	movdqu		$Xi,($Xip)
 	ret
 .size	gcm_gmult_clmul,.-gcm_gmult_clmul
 ___
 }

 { my ($Xip,$Htbl,$inp,$len)=@_4args;
   my $Xn="%xmm6";
   my $Xhn="%xmm7";
   my $Hkey2="%xmm8";
   my $T1n="%xmm9";
   my $T2n="%xmm10";

 $code.=<<___;
 .globl	gcm_ghash_clmul
 .type	gcm_ghash_clmul,\@abi-omnipotent
 .align	16
 gcm_ghash_clmul:
 ___
 $code.=<<___ if ($win64);
 .LSEH_begin_gcm_ghash_clmul:
 	# I can't trust assembler to use specific encoding:-(
 	.byte	0x48,0x83,0xec,0x58		#sub	\$0x58,%rsp
 	.byte	0x0f,0x29,0x34,0x24		#movaps	%xmm6,(%rsp)
 	.byte	0x0f,0x29,0x7c,0x24,0x10	#movdqa	%xmm7,0x10(%rsp)
 	.byte	0x44,0x0f,0x29,0x44,0x24,0x20	#movaps	%xmm8,0x20(%rsp)
 	.byte	0x44,0x0f,0x29,0x4c,0x24,0x30	#movaps	%xmm9,0x30(%rsp)
 	.byte	0x44,0x0f,0x29,0x54,0x24,0x40	#movaps	%xmm10,0x40(%rsp)
 ___
 $code.=<<___;
 	movdqa		.Lbswap_mask(%rip),$T3

 	movdqu		($Xip),$Xi
 	movdqu		($Htbl),$Hkey
 	pshufb		$T3,$Xi

 	sub		\$0x10,$len
 	jz		.Lodd_tail

 	movdqu		16($Htbl),$Hkey2
 	#######
 	# Xi+2 =[H*(Ii+1 + Xi+1)] mod P =
 	#	[(H*Ii+1) + (H*Xi+1)] mod P =
 	#	[(H*Ii+1) + H^2*(Ii+Xi)] mod P
 	#
 	movdqu		($inp),$T1		# Ii
 	movdqu		16($inp),$Xn		# Ii+1
 	pshufb		$T3,$T1
 	pshufb		$T3,$Xn
 	pxor		$T1,$Xi			# Ii+Xi
 ___
 	&clmul64x64_T2	($Xhn,$Xn,$Hkey);	# H*Ii+1
 $code.=<<___;
 	movdqa		$Xi,$Xhi		#
 	pshufd		\$0b01001110,$Xi,$T1
 	pshufd		\$0b01001110,$Hkey2,$T2
 	pxor		$Xi,$T1			#
 	pxor		$Hkey2,$T2

 	lea		32($inp),$inp		# i+=2
 	sub		\$0x20,$len
 	jbe		.Leven_tail

 .Lmod_loop:
 ___
 	&clmul64x64_T2	($Xhi,$Xi,$Hkey2,1);	# H^2*(Ii+Xi)
 $code.=<<___;
 	movdqu		($inp),$T1		# Ii
 	pxor		$Xn,$Xi			# (H*Ii+1) + H^2*(Ii+Xi)
 	pxor		$Xhn,$Xhi

 	movdqu		16($inp),$Xn		# Ii+1
 	pshufb		$T3,$T1
 	pshufb		$T3,$Xn

 	movdqa		$Xn,$Xhn		#
 	pshufd		\$0b01001110,$Xn,$T1n
 	pshufd		\$0b01001110,$Hkey,$T2n
 	pxor		$Xn,$T1n		#
 	pxor		$Hkey,$T2n
 	 pxor		$T1,$Xhi		# "Ii+Xi", consume early

 	  movdqa	$Xi,$T1			# 1st phase
 	  psllq		\$1,$Xi
 	  pxor		$T1,$Xi			#
 	  psllq		\$5,$Xi			#
 	  pxor		$T1,$Xi			#
 	pclmulqdq	\$0x00,$Hkey,$Xn	#######
 	  psllq		\$57,$Xi		#
 	  movdqa	$Xi,$T2			#
 	  pslldq	\$8,$Xi
 	  psrldq	\$8,$T2			#
 	  pxor		$T1,$Xi
 	  pxor		$T2,$Xhi		#

 	pclmulqdq	\$0x11,$Hkey,$Xhn	#######
 	  movdqa	$Xi,$T2			# 2nd phase
 	  psrlq		\$5,$Xi
 	  pxor		$T2,$Xi			#
 	  psrlq		\$1,$Xi			#
 	  pxor		$T2,$Xi			#
 	  pxor		$Xhi,$T2
 	  psrlq		\$1,$Xi			#
 	  pxor		$T2,$Xi			#

 	pclmulqdq	\$0x00,$T2n,$T1n	#######
 	 movdqa		$Xi,$Xhi		#
 	 pshufd		\$0b01001110,$Xi,$T1
 	 pshufd		\$0b01001110,$Hkey2,$T2
 	 pxor		$Xi,$T1			#
 	 pxor		$Hkey2,$T2

 	pxor		$Xn,$T1n		#
 	pxor		$Xhn,$T1n		#
 	movdqa		$T1n,$T2n		#
 	psrldq		\$8,$T1n
 	pslldq		\$8,$T2n		#
 	pxor		$T1n,$Xhn
 	pxor		$T2n,$Xn		#

 	lea		32($inp),$inp
 	sub		\$0x20,$len
 	ja		.Lmod_loop

 .Leven_tail:
 ___
 	&clmul64x64_T2	($Xhi,$Xi,$Hkey2,1);	# H^2*(Ii+Xi)
 $code.=<<___;
 	pxor		$Xn,$Xi			# (H*Ii+1) + H^2*(Ii+Xi)
 	pxor		$Xhn,$Xhi
 ___
 	&reduction_alg9	($Xhi,$Xi);
 $code.=<<___;
 	test		$len,$len
 	jnz		.Ldone

 .Lodd_tail:
 	movdqu		($inp),$T1		# Ii
 	pshufb		$T3,$T1
 	pxor		$T1,$Xi			# Ii+Xi
 ___
 	&clmul64x64_T2	($Xhi,$Xi,$Hkey);	# H*(Ii+Xi)
 	&reduction_alg9	($Xhi,$Xi);
 $code.=<<___;
 .Ldone:
 	pshufb		$T3,$Xi
 	movdqu		$Xi,($Xip)
 ___
 $code.=<<___ if ($win64);
 	movaps	(%rsp),%xmm6
 	movaps	0x10(%rsp),%xmm7
 	movaps	0x20(%rsp),%xmm8
 	movaps	0x30(%rsp),%xmm9
 	movaps	0x40(%rsp),%xmm10
 	add	\$0x58,%rsp
 ___
 $code.=<<___;
 	ret
 .LSEH_end_gcm_ghash_clmul:
 .size	gcm_ghash_clmul,.-gcm_ghash_clmul
 ___
 }

 $code.=<<___;
 .align	64
 .Lbswap_mask:
 	.byte	15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0
 .L0x1c2_polynomial:
 	.byte	1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xc2
 .align	64
 .type	.Lrem_4bit,\@object
 .Lrem_4bit:
 	.long	0,`0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`
 	.long	0,`0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`
 	.long	0,`0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`
 	.long	0,`0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`
 .type	.Lrem_8bit,\@object
 .Lrem_8bit:
 	.value	0x0000,0x01C2,0x0384,0x0246,0x0708,0x06CA,0x048C,0x054E
 	.value	0x0E10,0x0FD2,0x0D94,0x0C56,0x0918,0x08DA,0x0A9C,0x0B5E
 	.value	0x1C20,0x1DE2,0x1FA4,0x1E66,0x1B28,0x1AEA,0x18AC,0x196E
 	.value	0x1230,0x13F2,0x11B4,0x1076,0x1538,0x14FA,0x16BC,0x177E
 	.value	0x3840,0x3982,0x3BC4,0x3A06,0x3F48,0x3E8A,0x3CCC,0x3D0E
 	.value	0x3650,0x3792,0x35D4,0x3416,0x3158,0x309A,0x32DC,0x331E
 	.value	0x2460,0x25A2,0x27E4,0x2626,0x2368,0x22AA,0x20EC,0x212E
 	.value	0x2A70,0x2BB2,0x29F4,0x2836,0x2D78,0x2CBA,0x2EFC,0x2F3E
 	.value	0x7080,0x7142,0x7304,0x72C6,0x7788,0x764A,0x740C,0x75CE
 	.value	0x7E90,0x7F52,0x7D14,0x7CD6,0x7998,0x785A,0x7A1C,0x7BDE
 	.value	0x6CA0,0x6D62,0x6F24,0x6EE6,0x6BA8,0x6A6A,0x682C,0x69EE
 	.value	0x62B0,0x6372,0x6134,0x60F6,0x65B8,0x647A,0x663C,0x67FE
 	.value	0x48C0,0x4902,0x4B44,0x4A86,0x4FC8,0x4E0A,0x4C4C,0x4D8E
 	.value	0x46D0,0x4712,0x4554,0x4496,0x41D8,0x401A,0x425C,0x439E
 	.value	0x54E0,0x5522,0x5764,0x56A6,0x53E8,0x522A,0x506C,0x51AE
 	.value	0x5AF0,0x5B32,0x5974,0x58B6,0x5DF8,0x5C3A,0x5E7C,0x5FBE
 	.value	0xE100,0xE0C2,0xE284,0xE346,0xE608,0xE7CA,0xE58C,0xE44E
 	.value	0xEF10,0xEED2,0xEC94,0xED56,0xE818,0xE9DA,0xEB9C,0xEA5E
 	.value	0xFD20,0xFCE2,0xFEA4,0xFF66,0xFA28,0xFBEA,0xF9AC,0xF86E
 	.value	0xF330,0xF2F2,0xF0B4,0xF176,0xF438,0xF5FA,0xF7BC,0xF67E
 	.value	0xD940,0xD882,0xDAC4,0xDB06,0xDE48,0xDF8A,0xDDCC,0xDC0E
 	.value	0xD750,0xD692,0xD4D4,0xD516,0xD058,0xD19A,0xD3DC,0xD21E
 	.value	0xC560,0xC4A2,0xC6E4,0xC726,0xC268,0xC3AA,0xC1EC,0xC02E
 	.value	0xCB70,0xCAB2,0xC8F4,0xC936,0xCC78,0xCDBA,0xCFFC,0xCE3E
 	.value	0x9180,0x9042,0x9204,0x93C6,0x9688,0x974A,0x950C,0x94CE
 	.value	0x9F90,0x9E52,0x9C14,0x9DD6,0x9898,0x995A,0x9B1C,0x9ADE
 	.value	0x8DA0,0x8C62,0x8E24,0x8FE6,0x8AA8,0x8B6A,0x892C,0x88EE
 	.value	0x83B0,0x8272,0x8034,0x81F6,0x84B8,0x857A,0x873C,0x86FE
 	.value	0xA9C0,0xA802,0xAA44,0xAB86,0xAEC8,0xAF0A,0xAD4C,0xAC8E
 	.value	0xA7D0,0xA612,0xA454,0xA596,0xA0D8,0xA11A,0xA35C,0xA29E
 	.value	0xB5E0,0xB422,0xB664,0xB7A6,0xB2E8,0xB32A,0xB16C,0xB0AE
 	.value	0xBBF0,0xBA32,0xB874,0xB9B6,0xBCF8,0xBD3A,0xBF7C,0xBEBE

 .asciz	"GHASH for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
 .align	64
 ___

 # EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
 #		CONTEXT *context,DISPATCHER_CONTEXT *disp)
 if ($win64) {
 $rec="%rcx";
 $frame="%rdx";
 $context="%r8";
 $disp="%r9";

 $code.=<<___;
 .extern	__imp_RtlVirtualUnwind
 .type	se_handler,\@abi-omnipotent
 .align	16
 se_handler:
 	push	%rsi
 	push	%rdi
 	push	%rbx
 	push	%rbp
 	push	%r12
 	push	%r13
 	push	%r14
 	push	%r15
 	pushfq
 	sub	\$64,%rsp

 	mov	120($context),%rax	# pull context->Rax
 	mov	248($context),%rbx	# pull context->Rip

 	mov	8($disp),%rsi		# disp->ImageBase
 	mov	56($disp),%r11		# disp->HandlerData

 	mov	0(%r11),%r10d		# HandlerData[0]
 	lea	(%rsi,%r10),%r10	# prologue label
 	cmp	%r10,%rbx		# context->Rip<prologue label
 	jb	.Lin_prologue

 	mov	152($context),%rax	# pull context->Rsp

 	mov	4(%r11),%r10d		# HandlerData[1]
 	lea	(%rsi,%r10),%r10	# epilogue label
 	cmp	%r10,%rbx		# context->Rip>=epilogue label
 	jae	.Lin_prologue

 	lea	24(%rax),%rax		# adjust "rsp"

 	mov	-8(%rax),%rbx
 	mov	-16(%rax),%rbp
 	mov	-24(%rax),%r12
 	mov	%rbx,144($context)	# restore context->Rbx
 	mov	%rbp,160($context)	# restore context->Rbp
 	mov	%r12,216($context)	# restore context->R12

 .Lin_prologue:
 	mov	8(%rax),%rdi
 	mov	16(%rax),%rsi
 	mov	%rax,152($context)	# restore context->Rsp
 	mov	%rsi,168($context)	# restore context->Rsi
 	mov	%rdi,176($context)	# restore context->Rdi

 	mov	40($disp),%rdi		# disp->ContextRecord
 	mov	$context,%rsi		# context
 	mov	\$`1232/8`,%ecx		# sizeof(CONTEXT)
 	.long	0xa548f3fc		# cld; rep movsq

 	mov	$disp,%rsi
 	xor	%rcx,%rcx		# arg1, UNW_FLAG_NHANDLER
 	mov	8(%rsi),%rdx		# arg2, disp->ImageBase
 	mov	0(%rsi),%r8		# arg3, disp->ControlPc
 	mov	16(%rsi),%r9		# arg4, disp->FunctionEntry
 	mov	40(%rsi),%r10		# disp->ContextRecord
 	lea	56(%rsi),%r11		# &disp->HandlerData
 	lea	24(%rsi),%r12		# &disp->EstablisherFrame
 	mov	%r10,32(%rsp)		# arg5
 	mov	%r11,40(%rsp)		# arg6
 	mov	%r12,48(%rsp)		# arg7
 	mov	%rcx,56(%rsp)		# arg8, (NULL)
 	call	*__imp_RtlVirtualUnwind(%rip)

 	mov	\$1,%eax		# ExceptionContinueSearch
 	add	\$64,%rsp
 	popfq
 	pop	%r15
 	pop	%r14
 	pop	%r13
 	pop	%r12
 	pop	%rbp
 	pop	%rbx
 	pop	%rdi
 	pop	%rsi
 	ret
 .size	se_handler,.-se_handler

 .section	.pdata
 .align	4
 	.rva	.LSEH_begin_gcm_gmult_4bit
 	.rva	.LSEH_end_gcm_gmult_4bit
 	.rva	.LSEH_info_gcm_gmult_4bit

 	.rva	.LSEH_begin_gcm_ghash_4bit
 	.rva	.LSEH_end_gcm_ghash_4bit
 	.rva	.LSEH_info_gcm_ghash_4bit

 	.rva	.LSEH_begin_gcm_ghash_clmul
 	.rva	.LSEH_end_gcm_ghash_clmul
 	.rva	.LSEH_info_gcm_ghash_clmul

 .section	.xdata
 .align	8
 .LSEH_info_gcm_gmult_4bit:
 	.byte	9,0,0,0
 	.rva	se_handler
 	.rva	.Lgmult_prologue,.Lgmult_epilogue	# HandlerData
 .LSEH_info_gcm_ghash_4bit:
 	.byte	9,0,0,0
 	.rva	se_handler
 	.rva	.Lghash_prologue,.Lghash_epilogue	# HandlerData
 .LSEH_info_gcm_ghash_clmul:
 	.byte	0x01,0x1f,0x0b,0x00
 	.byte	0x1f,0xa8,0x04,0x00	#movaps 0x40(rsp),xmm10
 	.byte	0x19,0x98,0x03,0x00	#movaps 0x30(rsp),xmm9
 	.byte	0x13,0x88,0x02,0x00	#movaps 0x20(rsp),xmm8
 	.byte	0x0d,0x78,0x01,0x00	#movaps 0x10(rsp),xmm7
 	.byte	0x08,0x68,0x00,0x00	#movaps (rsp),xmm6
 	.byte	0x04,0xa2,0x00,0x00	#sub	rsp,0x58
 ___
 }

 $code =~ s/\`([^\`]*)\`/eval($1)/gem;

 print $code;

 close STDOUT;
	#!/usr/bin/env perl
	#
	# ====================================================================
	# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
	# project. The module is, however, dual licensed under OpenSSL and
	# CRYPTOGAMS licenses depending on where you obtain it. For further
	# details see http://www.openssl.org/~appro/cryptogams/.
	# ====================================================================
	#
	# March, June 2010
	#
	# The module implements "4-bit" GCM GHASH function and underlying
	# single multiplication operation in GF(2^128). "4-bit" means that
	# it uses 256 bytes per-key table [+128 bytes shared table]. GHASH
	# function features so called "528B" variant utilizing additional
	# 256+16 bytes of per-key storage [+512 bytes shared table].
	# Performance results are for this streamed GHASH subroutine and are
	# expressed in cycles per processed byte, less is better:
	#
	# gcc 3.4.x(*) assembler
	#
	# P4 28.6 14.0 +100%
	# Opteron 19.3 7.7 +150%
	# Core2 17.8 8.1(**) +120%
	#
	# (*) comparison is not completely fair, because C results are
	# for vanilla "256B" implementation, while assembler results
	# are for "528B";-)
	# (**) it's mystery [to me] why Core2 result is not same as for
	# Opteron;

	# May 2010
	#
	# Add PCLMULQDQ version performing at 2.02 cycles per processed byte.
	# See ghash-x86.pl for background information and details about coding
	# techniques.
	#
	# Special thanks to David Woodhouse <dwmw2@infradead.org> for
	# providing access to a Westmere-based system on behalf of Intel
	# Open Source Technology Centre.

	$flavour = shift;
	$output = shift;
	if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }

	$win64=0; $win64=1 if ($flavour =~ /[nm]asm\|mingw64/ \|\| $output =~ /\.asm$/);

	$0 =~ m/(.*[\/\\])[^\/\\]+$/; $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 OUT,"\| \"$^X\" $xlate $flavour $output";
	STDOUT=OUT;

	# common register layout
	$nlo="%rax";
	$nhi="%rbx";
	$Zlo="%r8";
	$Zhi="%r9";
	$tmp="%r10";
	$rem_4bit = "%r11";

	$Xi="%rdi";
	$Htbl="%rsi";

	# per-function register layout
	$cnt="%rcx";
	$rem="%rdx";

	sub LB() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/ or
	$r =~ s/%[er]([sd]i)/%\1l/ or
	$r =~ s/%[er](bp)/%\1l/ or
	$r =~ s/%(r[0-9]+)[d]?/%\1b/; $r; }

	sub AUTOLOAD() # thunk [simplified] 32-bit style perlasm
	{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://;
	my $arg = pop;
	$arg = "\$$arg" if ($arg*1 eq $arg);
	$code .= "\t$opcode\t".join(',',$arg,reverse @_)."\n";
	}

	{ my $N;
	sub loop() {
	my $inp = shift;

	$N++;
	$code.=<<___;
	xor $nlo,$nlo
	xor $nhi,$nhi
	mov `&LB("$Zlo")`,`&LB("$nlo")`
	mov `&LB("$Zlo")`,`&LB("$nhi")`
	shl \$4,`&LB("$nlo")`
	mov \$14,$cnt
	mov 8($Htbl,$nlo),$Zlo
	mov ($Htbl,$nlo),$Zhi
	and \$0xf0,`&LB("$nhi")`
	mov $Zlo,$rem
	jmp .Loop$N

	.align 16
	.Loop$N:
	shr \$4,$Zlo
	and \$0xf,$rem
	mov $Zhi,$tmp
	mov ($inp,$cnt),`&LB("$nlo")`
	shr \$4,$Zhi
	xor 8($Htbl,$nhi),$Zlo
	shl \$60,$tmp
	xor ($Htbl,$nhi),$Zhi
	mov `&LB("$nlo")`,`&LB("$nhi")`
	xor ($rem_4bit,$rem,8),$Zhi
	mov $Zlo,$rem
	shl \$4,`&LB("$nlo")`
	xor $tmp,$Zlo
	dec $cnt
	js .Lbreak$N

	shr \$4,$Zlo
	and \$0xf,$rem
	mov $Zhi,$tmp
	shr \$4,$Zhi
	xor 8($Htbl,$nlo),$Zlo
	shl \$60,$tmp
	xor ($Htbl,$nlo),$Zhi
	and \$0xf0,`&LB("$nhi")`
	xor ($rem_4bit,$rem,8),$Zhi
	mov $Zlo,$rem
	xor $tmp,$Zlo
	jmp .Loop$N

	.align 16
	.Lbreak$N:
	shr \$4,$Zlo
	and \$0xf,$rem
	mov $Zhi,$tmp
	shr \$4,$Zhi
	xor 8($Htbl,$nlo),$Zlo
	shl \$60,$tmp
	xor ($Htbl,$nlo),$Zhi
	and \$0xf0,`&LB("$nhi")`
	xor ($rem_4bit,$rem,8),$Zhi
	mov $Zlo,$rem
	xor $tmp,$Zlo

	shr \$4,$Zlo
	and \$0xf,$rem
	mov $Zhi,$tmp
	shr \$4,$Zhi
	xor 8($Htbl,$nhi),$Zlo
	shl \$60,$tmp
	xor ($Htbl,$nhi),$Zhi
	xor $tmp,$Zlo
	xor ($rem_4bit,$rem,8),$Zhi

	bswap $Zlo
	bswap $Zhi
	___
	}}

	$code=<<___;
	.text

	.globl gcm_gmult_4bit
	.type gcm_gmult_4bit,\@function,2
	.align 16
	gcm_gmult_4bit:
	push %rbx
	push %rbp # %rbp and %r12 are pushed exclusively in
	push %r12 # order to reuse Win64 exception handler...
	.Lgmult_prologue:

	movzb 15($Xi),$Zlo
	lea .Lrem_4bit(%rip),$rem_4bit
	___
	&loop ($Xi);
	$code.=<<___;
	mov $Zlo,8($Xi)
	mov $Zhi,($Xi)

	mov 16(%rsp),%rbx
	lea 24(%rsp),%rsp
	.Lgmult_epilogue:
	ret
	.size gcm_gmult_4bit,.-gcm_gmult_4bit
	___

	# per-function register layout
	$inp="%rdx";
	$len="%rcx";
	$rem_8bit=$rem_4bit;

	$code.=<<___;
	.globl gcm_ghash_4bit
	.type gcm_ghash_4bit,\@function,4
	.align 16
	gcm_ghash_4bit:
	push %rbx
	push %rbp
	push %r12
	push %r13
	push %r14
	push %r15
	sub \$280,%rsp
	.Lghash_prologue:
	mov $inp,%r14 # reassign couple of args
	mov $len,%r15
	___
	{ my $inp="%r14";
	my $dat="%edx";
	my $len="%r15";
	my @nhi=("%ebx","%ecx");
	my @rem=("%r12","%r13");
	my $Hshr4="%rbp";

	&sub ($Htbl,-128); # size optimization
	&lea ($Hshr4,"16+128(%rsp)");
	{ my @lo =($nlo,$nhi);
	my @hi =($Zlo,$Zhi);

	&xor ($dat,$dat);
	for ($i=0,$j=-2;$i<18;$i++,$j++) {
	&mov ("$j(%rsp)",&LB($dat)) if ($i>1);
	&or ($lo[0],$tmp) if ($i>1);
	&mov (&LB($dat),&LB($lo[1])) if ($i>0 && $i<17);
	&shr ($lo[1],4) if ($i>0 && $i<17);
	&mov ($tmp,$hi[1]) if ($i>0 && $i<17);
	&shr ($hi[1],4) if ($i>0 && $i<17);
	&mov ("8*$j($Hshr4)",$hi[0]) if ($i>1);
	&mov ($hi[0],"16*$i+0-128($Htbl)") if ($i<16);
	&shl (&LB($dat),4) if ($i>0 && $i<17);
	&mov ("8*$j-128($Hshr4)",$lo[0]) if ($i>1);
	&mov ($lo[0],"16*$i+8-128($Htbl)") if ($i<16);
	&shl ($tmp,60) if ($i>0 && $i<17);

	push (@lo,shift(@lo));
	push (@hi,shift(@hi));
	}
	}
	&add ($Htbl,-128);
	&mov ($Zlo,"8($Xi)");
	&mov ($Zhi,"0($Xi)");
	&add ($len,$inp); # pointer to the end of data
	&lea ($rem_8bit,".Lrem_8bit(%rip)");
	&jmp (".Louter_loop");

	$code.=".align 16\n.Louter_loop:\n";
	&xor ($Zhi,"($inp)");
	&mov ("%rdx","8($inp)");
	&lea ($inp,"16($inp)");
	&xor ("%rdx",$Zlo);
	&mov ("($Xi)",$Zhi);
	&mov ("8($Xi)","%rdx");
	&shr ("%rdx",32);

	&xor ($nlo,$nlo);
	&rol ($dat,8);
	&mov (&LB($nlo),&LB($dat));
	&movz ($nhi[0],&LB($dat));
	&shl (&LB($nlo),4);
	&shr ($nhi[0],4);

	for ($j=11,$i=0;$i<15;$i++) {
	&rol ($dat,8);
	&xor ($Zlo,"8($Htbl,$nlo)") if ($i>0);
	&xor ($Zhi,"($Htbl,$nlo)") if ($i>0);
	&mov ($Zlo,"8($Htbl,$nlo)") if ($i==0);
	&mov ($Zhi,"($Htbl,$nlo)") if ($i==0);

	&mov (&LB($nlo),&LB($dat));
	&xor ($Zlo,$tmp) if ($i>0);
	&movzw ($rem[1],"($rem_8bit,$rem[1],2)") if ($i>0);

	&movz ($nhi[1],&LB($dat));
	&shl (&LB($nlo),4);
	&movzb ($rem[0],"(%rsp,$nhi[0])");

	&shr ($nhi[1],4) if ($i<14);
	&and ($nhi[1],0xf0) if ($i==14);
	&shl ($rem[1],48) if ($i>0);
	&xor ($rem[0],$Zlo);

	&mov ($tmp,$Zhi);
	&xor ($Zhi,$rem[1]) if ($i>0);
	&shr ($Zlo,8);

	&movz ($rem[0],&LB($rem[0]));
	&mov ($dat,"$j($Xi)") if (--$j%4==0);
	&shr ($Zhi,8);

	&xor ($Zlo,"-128($Hshr4,$nhi[0],8)");
	&shl ($tmp,56);
	&xor ($Zhi,"($Hshr4,$nhi[0],8)");

	unshift (@nhi,pop(@nhi)); # "rotate" registers
	unshift (@rem,pop(@rem));
	}
	&movzw ($rem[1],"($rem_8bit,$rem[1],2)");
	&xor ($Zlo,"8($Htbl,$nlo)");
	&xor ($Zhi,"($Htbl,$nlo)");

	&shl ($rem[1],48);
	&xor ($Zlo,$tmp);

	&xor ($Zhi,$rem[1]);
	&movz ($rem[0],&LB($Zlo));
	&shr ($Zlo,4);

	&mov ($tmp,$Zhi);
	&shl (&LB($rem[0]),4);
	&shr ($Zhi,4);

	&xor ($Zlo,"8($Htbl,$nhi[0])");
	&movzw ($rem[0],"($rem_8bit,$rem[0],2)");
	&shl ($tmp,60);

	&xor ($Zhi,"($Htbl,$nhi[0])");
	&xor ($Zlo,$tmp);
	&shl ($rem[0],48);

	&bswap ($Zlo);
	&xor ($Zhi,$rem[0]);

	&bswap ($Zhi);
	&cmp ($inp,$len);
	&jb (".Louter_loop");
	}
	$code.=<<___;
	mov $Zlo,8($Xi)
	mov $Zhi,($Xi)

	lea 280(%rsp),%rsi
	mov 0(%rsi),%r15
	mov 8(%rsi),%r14
	mov 16(%rsi),%r13
	mov 24(%rsi),%r12
	mov 32(%rsi),%rbp
	mov 40(%rsi),%rbx
	lea 48(%rsi),%rsp
	.Lghash_epilogue:
	ret
	.size gcm_ghash_4bit,.-gcm_ghash_4bit
	___

	######################################################################
	# PCLMULQDQ version.

	@_4args=$win64? ("%rcx","%rdx","%r8", "%r9") : # Win64 order
	("%rdi","%rsi","%rdx","%rcx"); # Unix order

	($Xi,$Xhi)=("%xmm0","%xmm1"); $Hkey="%xmm2";
	($T1,$T2,$T3)=("%xmm3","%xmm4","%xmm5");

	sub clmul64x64_T2 { # minimal register pressure
	my ($Xhi,$Xi,$Hkey,$modulo)=@_;

	$code.=<<___ if (!defined($modulo));
	movdqa $Xi,$Xhi #
	pshufd \$0b01001110,$Xi,$T1
	pshufd \$0b01001110,$Hkey,$T2
	pxor $Xi,$T1 #
	pxor $Hkey,$T2
	___
	$code.=<<___;
	pclmulqdq \$0x00,$Hkey,$Xi #######
	pclmulqdq \$0x11,$Hkey,$Xhi #######
	pclmulqdq \$0x00,$T2,$T1 #######
	pxor $Xi,$T1 #
	pxor $Xhi,$T1 #

	movdqa $T1,$T2 #
	psrldq \$8,$T1
	pslldq \$8,$T2 #
	pxor $T1,$Xhi
	pxor $T2,$Xi #
	___
	}

	sub reduction_alg9 { # 17/13 times faster than Intel version
	my ($Xhi,$Xi) = @_;

	$code.=<<___;
	# 1st phase
	movdqa $Xi,$T1 #
	psllq \$1,$Xi
	pxor $T1,$Xi #
	psllq \$5,$Xi #
	pxor $T1,$Xi #
	psllq \$57,$Xi #
	movdqa $Xi,$T2 #
	pslldq \$8,$Xi
	psrldq \$8,$T2 #
	pxor $T1,$Xi
	pxor $T2,$Xhi #

	# 2nd phase
	movdqa $Xi,$T2
	psrlq \$5,$Xi
	pxor $T2,$Xi #
	psrlq \$1,$Xi #
	pxor $T2,$Xi #
	pxor $Xhi,$T2
	psrlq \$1,$Xi #
	pxor $T2,$Xi #
	___
	}

	{ my ($Htbl,$Xip)=@_4args;

	$code.=<<___;
	.globl gcm_init_clmul
	.type gcm_init_clmul,\@abi-omnipotent
	.align 16
	gcm_init_clmul:
	movdqu ($Xip),$Hkey
	pshufd \$0b01001110,$Hkey,$Hkey # dword swap

	# <<1 twist
	pshufd \$0b11111111,$Hkey,$T2 # broadcast uppermost dword
	movdqa $Hkey,$T1
	psllq \$1,$Hkey
	pxor $T3,$T3 #
	psrlq \$63,$T1
	pcmpgtd $T2,$T3 # broadcast carry bit
	pslldq \$8,$T1
	por $T1,$Hkey # H<<=1

	# magic reduction
	pand .L0x1c2_polynomial(%rip),$T3
	pxor $T3,$Hkey # if(carry) H^=0x1c2_polynomial

	# calculate H^2
	movdqa $Hkey,$Xi
	___
	&clmul64x64_T2 ($Xhi,$Xi,$Hkey);
	&reduction_alg9 ($Xhi,$Xi);
	$code.=<<___;
	movdqu $Hkey,($Htbl) # save H
	movdqu $Xi,16($Htbl) # save H^2
	ret
	.size gcm_init_clmul,.-gcm_init_clmul
	___
	}

	{ my ($Xip,$Htbl)=@_4args;

	$code.=<<___;
	.globl gcm_gmult_clmul
	.type gcm_gmult_clmul,\@abi-omnipotent
	.align 16
	gcm_gmult_clmul:
	movdqu ($Xip),$Xi
	movdqa .Lbswap_mask(%rip),$T3
	movdqu ($Htbl),$Hkey
	pshufb $T3,$Xi
	___
	&clmul64x64_T2 ($Xhi,$Xi,$Hkey);
	&reduction_alg9 ($Xhi,$Xi);
	$code.=<<___;
	pshufb $T3,$Xi
	movdqu $Xi,($Xip)
	ret
	.size gcm_gmult_clmul,.-gcm_gmult_clmul
	___
	}

	{ my ($Xip,$Htbl,$inp,$len)=@_4args;
	my $Xn="%xmm6";
	my $Xhn="%xmm7";
	my $Hkey2="%xmm8";
	my $T1n="%xmm9";
	my $T2n="%xmm10";

	$code.=<<___;
	.globl gcm_ghash_clmul
	.type gcm_ghash_clmul,\@abi-omnipotent
	.align 16
	gcm_ghash_clmul:
	___
	$code.=<<___ if ($win64);
	.LSEH_begin_gcm_ghash_clmul:
	# I can't trust assembler to use specific encoding:-(
	.byte 0x48,0x83,0xec,0x58 #sub \$0x58,%rsp
	.byte 0x0f,0x29,0x34,0x24 #movaps %xmm6,(%rsp)
	.byte 0x0f,0x29,0x7c,0x24,0x10 #movdqa %xmm7,0x10(%rsp)
	.byte 0x44,0x0f,0x29,0x44,0x24,0x20 #movaps %xmm8,0x20(%rsp)
	.byte 0x44,0x0f,0x29,0x4c,0x24,0x30 #movaps %xmm9,0x30(%rsp)
	.byte 0x44,0x0f,0x29,0x54,0x24,0x40 #movaps %xmm10,0x40(%rsp)
	___
	$code.=<<___;
	movdqa .Lbswap_mask(%rip),$T3

	movdqu ($Xip),$Xi
	movdqu ($Htbl),$Hkey
	pshufb $T3,$Xi

	sub \$0x10,$len
	jz .Lodd_tail

	movdqu 16($Htbl),$Hkey2
	#######
	# Xi+2 =[H*(Ii+1 + Xi+1)] mod P =
	# [(HIi+1) + (HXi+1)] mod P =
	# [(HIi+1) + H^2(Ii+Xi)] mod P
	#
	movdqu ($inp),$T1 # Ii
	movdqu 16($inp),$Xn # Ii+1
	pshufb $T3,$T1
	pshufb $T3,$Xn
	pxor $T1,$Xi # Ii+Xi
	___
	&clmul64x64_T2 ($Xhn,$Xn,$Hkey); # H*Ii+1
	$code.=<<___;
	movdqa $Xi,$Xhi #
	pshufd \$0b01001110,$Xi,$T1
	pshufd \$0b01001110,$Hkey2,$T2
	pxor $Xi,$T1 #
	pxor $Hkey2,$T2

	lea 32($inp),$inp # i+=2
	sub \$0x20,$len
	jbe .Leven_tail

	.Lmod_loop:
	___
	&clmul64x64_T2 ($Xhi,$Xi,$Hkey2,1); # H^2*(Ii+Xi)
	$code.=<<___;
	movdqu ($inp),$T1 # Ii
	pxor $Xn,$Xi # (HIi+1) + H^2(Ii+Xi)
	pxor $Xhn,$Xhi

	movdqu 16($inp),$Xn # Ii+1
	pshufb $T3,$T1
	pshufb $T3,$Xn

	movdqa $Xn,$Xhn #
	pshufd \$0b01001110,$Xn,$T1n
	pshufd \$0b01001110,$Hkey,$T2n
	pxor $Xn,$T1n #
	pxor $Hkey,$T2n
	pxor $T1,$Xhi # "Ii+Xi", consume early

	movdqa $Xi,$T1 # 1st phase
	psllq \$1,$Xi
	pxor $T1,$Xi #
	psllq \$5,$Xi #
	pxor $T1,$Xi #
	pclmulqdq \$0x00,$Hkey,$Xn #######
	psllq \$57,$Xi #
	movdqa $Xi,$T2 #
	pslldq \$8,$Xi
	psrldq \$8,$T2 #
	pxor $T1,$Xi
	pxor $T2,$Xhi #

	pclmulqdq \$0x11,$Hkey,$Xhn #######
	movdqa $Xi,$T2 # 2nd phase
	psrlq \$5,$Xi
	pxor $T2,$Xi #
	psrlq \$1,$Xi #
	pxor $T2,$Xi #
	pxor $Xhi,$T2
	psrlq \$1,$Xi #
	pxor $T2,$Xi #

	pclmulqdq \$0x00,$T2n,$T1n #######
	movdqa $Xi,$Xhi #
	pshufd \$0b01001110,$Xi,$T1
	pshufd \$0b01001110,$Hkey2,$T2
	pxor $Xi,$T1 #
	pxor $Hkey2,$T2

	pxor $Xn,$T1n #
	pxor $Xhn,$T1n #
	movdqa $T1n,$T2n #
	psrldq \$8,$T1n
	pslldq \$8,$T2n #
	pxor $T1n,$Xhn
	pxor $T2n,$Xn #

	lea 32($inp),$inp
	sub \$0x20,$len
	ja .Lmod_loop

	.Leven_tail:
	___
	&clmul64x64_T2 ($Xhi,$Xi,$Hkey2,1); # H^2*(Ii+Xi)
	$code.=<<___;
	pxor $Xn,$Xi # (HIi+1) + H^2(Ii+Xi)
	pxor $Xhn,$Xhi
	___
	&reduction_alg9 ($Xhi,$Xi);
	$code.=<<___;
	test $len,$len
	jnz .Ldone

	.Lodd_tail:
	movdqu ($inp),$T1 # Ii
	pshufb $T3,$T1
	pxor $T1,$Xi # Ii+Xi
	___
	&clmul64x64_T2 ($Xhi,$Xi,$Hkey); # H*(Ii+Xi)
	&reduction_alg9 ($Xhi,$Xi);
	$code.=<<___;
	.Ldone:
	pshufb $T3,$Xi
	movdqu $Xi,($Xip)
	___
	$code.=<<___ if ($win64);
	movaps (%rsp),%xmm6
	movaps 0x10(%rsp),%xmm7
	movaps 0x20(%rsp),%xmm8
	movaps 0x30(%rsp),%xmm9
	movaps 0x40(%rsp),%xmm10
	add \$0x58,%rsp
	___
	$code.=<<___;
	ret
	.LSEH_end_gcm_ghash_clmul:
	.size gcm_ghash_clmul,.-gcm_ghash_clmul
	___
	}

	$code.=<<___;
	.align 64
	.Lbswap_mask:
	.byte 15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0
	.L0x1c2_polynomial:
	.byte 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xc2
	.align 64
	.type .Lrem_4bit,\@object
	.Lrem_4bit:
	.long 0,`0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`
	.long 0,`0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`
	.long 0,`0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`
	.long 0,`0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`
	.type .Lrem_8bit,\@object
	.Lrem_8bit:
	.value 0x0000,0x01C2,0x0384,0x0246,0x0708,0x06CA,0x048C,0x054E
	.value 0x0E10,0x0FD2,0x0D94,0x0C56,0x0918,0x08DA,0x0A9C,0x0B5E
	.value 0x1C20,0x1DE2,0x1FA4,0x1E66,0x1B28,0x1AEA,0x18AC,0x196E
	.value 0x1230,0x13F2,0x11B4,0x1076,0x1538,0x14FA,0x16BC,0x177E
	.value 0x3840,0x3982,0x3BC4,0x3A06,0x3F48,0x3E8A,0x3CCC,0x3D0E
	.value 0x3650,0x3792,0x35D4,0x3416,0x3158,0x309A,0x32DC,0x331E
	.value 0x2460,0x25A2,0x27E4,0x2626,0x2368,0x22AA,0x20EC,0x212E
	.value 0x2A70,0x2BB2,0x29F4,0x2836,0x2D78,0x2CBA,0x2EFC,0x2F3E
	.value 0x7080,0x7142,0x7304,0x72C6,0x7788,0x764A,0x740C,0x75CE
	.value 0x7E90,0x7F52,0x7D14,0x7CD6,0x7998,0x785A,0x7A1C,0x7BDE
	.value 0x6CA0,0x6D62,0x6F24,0x6EE6,0x6BA8,0x6A6A,0x682C,0x69EE
	.value 0x62B0,0x6372,0x6134,0x60F6,0x65B8,0x647A,0x663C,0x67FE
	.value 0x48C0,0x4902,0x4B44,0x4A86,0x4FC8,0x4E0A,0x4C4C,0x4D8E
	.value 0x46D0,0x4712,0x4554,0x4496,0x41D8,0x401A,0x425C,0x439E
	.value 0x54E0,0x5522,0x5764,0x56A6,0x53E8,0x522A,0x506C,0x51AE
	.value 0x5AF0,0x5B32,0x5974,0x58B6,0x5DF8,0x5C3A,0x5E7C,0x5FBE
	.value 0xE100,0xE0C2,0xE284,0xE346,0xE608,0xE7CA,0xE58C,0xE44E
	.value 0xEF10,0xEED2,0xEC94,0xED56,0xE818,0xE9DA,0xEB9C,0xEA5E
	.value 0xFD20,0xFCE2,0xFEA4,0xFF66,0xFA28,0xFBEA,0xF9AC,0xF86E
	.value 0xF330,0xF2F2,0xF0B4,0xF176,0xF438,0xF5FA,0xF7BC,0xF67E
	.value 0xD940,0xD882,0xDAC4,0xDB06,0xDE48,0xDF8A,0xDDCC,0xDC0E
	.value 0xD750,0xD692,0xD4D4,0xD516,0xD058,0xD19A,0xD3DC,0xD21E
	.value 0xC560,0xC4A2,0xC6E4,0xC726,0xC268,0xC3AA,0xC1EC,0xC02E
	.value 0xCB70,0xCAB2,0xC8F4,0xC936,0xCC78,0xCDBA,0xCFFC,0xCE3E
	.value 0x9180,0x9042,0x9204,0x93C6,0x9688,0x974A,0x950C,0x94CE
	.value 0x9F90,0x9E52,0x9C14,0x9DD6,0x9898,0x995A,0x9B1C,0x9ADE
	.value 0x8DA0,0x8C62,0x8E24,0x8FE6,0x8AA8,0x8B6A,0x892C,0x88EE
	.value 0x83B0,0x8272,0x8034,0x81F6,0x84B8,0x857A,0x873C,0x86FE
	.value 0xA9C0,0xA802,0xAA44,0xAB86,0xAEC8,0xAF0A,0xAD4C,0xAC8E
	.value 0xA7D0,0xA612,0xA454,0xA596,0xA0D8,0xA11A,0xA35C,0xA29E
	.value 0xB5E0,0xB422,0xB664,0xB7A6,0xB2E8,0xB32A,0xB16C,0xB0AE
	.value 0xBBF0,0xBA32,0xB874,0xB9B6,0xBCF8,0xBD3A,0xBF7C,0xBEBE

	.asciz "GHASH for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
	.align 64
	___

	# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
	# CONTEXT context,DISPATCHER_CONTEXT disp)
	if ($win64) {
	$rec="%rcx";
	$frame="%rdx";
	$context="%r8";
	$disp="%r9";

	$code.=<<___;
	.extern __imp_RtlVirtualUnwind
	.type se_handler,\@abi-omnipotent
	.align 16
	se_handler:
	push %rsi
	push %rdi
	push %rbx
	push %rbp
	push %r12
	push %r13
	push %r14
	push %r15
	pushfq
	sub \$64,%rsp

	mov 120($context),%rax # pull context->Rax
	mov 248($context),%rbx # pull context->Rip

	mov 8($disp),%rsi # disp->ImageBase
	mov 56($disp),%r11 # disp->HandlerData

	mov 0(%r11),%r10d # HandlerData[0]
	lea (%rsi,%r10),%r10 # prologue label
	cmp %r10,%rbx # context->Rip<prologue label
	jb .Lin_prologue

	mov 152($context),%rax # pull context->Rsp

	mov 4(%r11),%r10d # HandlerData[1]
	lea (%rsi,%r10),%r10 # epilogue label
	cmp %r10,%rbx # context->Rip>=epilogue label
	jae .Lin_prologue

	lea 24(%rax),%rax # adjust "rsp"

	mov -8(%rax),%rbx
	mov -16(%rax),%rbp
	mov -24(%rax),%r12
	mov %rbx,144($context) # restore context->Rbx
	mov %rbp,160($context) # restore context->Rbp
	mov %r12,216($context) # restore context->R12

	.Lin_prologue:
	mov 8(%rax),%rdi
	mov 16(%rax),%rsi
	mov %rax,152($context) # restore context->Rsp
	mov %rsi,168($context) # restore context->Rsi
	mov %rdi,176($context) # restore context->Rdi

	mov 40($disp),%rdi # disp->ContextRecord
	mov $context,%rsi # context
	mov \$`1232/8`,%ecx # sizeof(CONTEXT)
	.long 0xa548f3fc # cld; rep movsq

	mov $disp,%rsi
	xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
	mov 8(%rsi),%rdx # arg2, disp->ImageBase
	mov 0(%rsi),%r8 # arg3, disp->ControlPc
	mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
	mov 40(%rsi),%r10 # disp->ContextRecord
	lea 56(%rsi),%r11 # &disp->HandlerData
	lea 24(%rsi),%r12 # &disp->EstablisherFrame
	mov %r10,32(%rsp) # arg5
	mov %r11,40(%rsp) # arg6
	mov %r12,48(%rsp) # arg7
	mov %rcx,56(%rsp) # arg8, (NULL)
	call *__imp_RtlVirtualUnwind(%rip)

	mov \$1,%eax # ExceptionContinueSearch
	add \$64,%rsp
	popfq
	pop %r15
	pop %r14
	pop %r13
	pop %r12
	pop %rbp
	pop %rbx
	pop %rdi
	pop %rsi
	ret
	.size se_handler,.-se_handler

	.section .pdata
	.align 4
	.rva .LSEH_begin_gcm_gmult_4bit
	.rva .LSEH_end_gcm_gmult_4bit
	.rva .LSEH_info_gcm_gmult_4bit

	.rva .LSEH_begin_gcm_ghash_4bit
	.rva .LSEH_end_gcm_ghash_4bit
	.rva .LSEH_info_gcm_ghash_4bit

	.rva .LSEH_begin_gcm_ghash_clmul
	.rva .LSEH_end_gcm_ghash_clmul
	.rva .LSEH_info_gcm_ghash_clmul

	.section .xdata
	.align 8
	.LSEH_info_gcm_gmult_4bit:
	.byte 9,0,0,0
	.rva se_handler
	.rva .Lgmult_prologue,.Lgmult_epilogue # HandlerData
	.LSEH_info_gcm_ghash_4bit:
	.byte 9,0,0,0
	.rva se_handler
	.rva .Lghash_prologue,.Lghash_epilogue # HandlerData
	.LSEH_info_gcm_ghash_clmul:
	.byte 0x01,0x1f,0x0b,0x00
	.byte 0x1f,0xa8,0x04,0x00 #movaps 0x40(rsp),xmm10
	.byte 0x19,0x98,0x03,0x00 #movaps 0x30(rsp),xmm9
	.byte 0x13,0x88,0x02,0x00 #movaps 0x20(rsp),xmm8
	.byte 0x0d,0x78,0x01,0x00 #movaps 0x10(rsp),xmm7
	.byte 0x08,0x68,0x00,0x00 #movaps (rsp),xmm6
	.byte 0x04,0xa2,0x00,0x00 #sub rsp,0x58
	___
	}

	$code =~ s/\`([^\`]*)\`/eval($1)/gem;

	print $code;

	close STDOUT;