Commit d364506a authored by Andy Polyakov's avatar Andy Polyakov
Browse files

ghash-x86_64.pl: "528B" variant delivers further >30% improvement.

parent 04e2b793

crypto/modes/asm/ghash-x86_64.pl

+204 −43
Original line number Diff line number Diff line
@@ -7,18 +7,26 @@ 
# details see http://www.openssl.org/~appro/cryptogams/.

# ====================================================================

#

# March 2010

# 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]. Performance

# results are for streamed GHASH subroutine and are expressed in

# cycles per processed byte, less is better:

# 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

#		gcc 3.4.x(*)	assembler

#

# Opteron	18.5		10.2		+80%

# Core2		17.5		11.0		+59%

# P4		28.6		14.0		+100%

# Opteron	18.5		7.7		+140%

# Core2		17.5		8.1(**)		+115%

#

# (*)	comparison is not completely fair, because C results are

#	for vanilla "256B" implementation, not "528B";-)

# (**)	it's mystery [to me] why Core2 result is not same as for

#	Opteron;



# May 2010

#
@@ -58,9 +66,17 @@ $Htbl="%rsi"; 
$cnt="%rcx";

$rem="%rdx";



sub lo() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/;

			$r =~ s/%[er]([sd]i)/%\1l/;

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() {
@@ -70,13 +86,13 @@ sub lo() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/; 
$code.=<<___;

	xor	$nlo,$nlo

	xor	$nhi,$nhi

	mov	`&lo("$Zlo")`,`&lo("$nlo")`

	mov	`&lo("$Zlo")`,`&lo("$nhi")`

	shl	\$4,`&lo("$nlo")`

	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,`&lo("$nhi")`

	and	\$0xf0,`&LB("$nhi")`

	mov	$Zlo,$rem

	jmp	.Loop$N
@@ -85,15 +101,15 @@ $code.=<<___; 
	shr	\$4,$Zlo

	and	\$0xf,$rem

	mov	$Zhi,$tmp

	mov	($inp,$cnt),`&lo("$nlo")`

	mov	($inp,$cnt),`&LB("$nlo")`

	shr	\$4,$Zhi

	xor	8($Htbl,$nhi),$Zlo

	shl	\$60,$tmp

	xor	($Htbl,$nhi),$Zhi

	mov	`&lo("$nlo")`,`&lo("$nhi")`

	mov	`&LB("$nlo")`,`&LB("$nhi")`

	xor	($rem_4bit,$rem,8),$Zhi

	mov	$Zlo,$rem

	shl	\$4,`&lo("$nlo")`

	shl	\$4,`&LB("$nlo")`

	xor	$tmp,$Zlo

	dec	$cnt

	js	.Lbreak$N
@@ -105,7 +121,7 @@ $code.=<<___; 
	xor	8($Htbl,$nlo),$Zlo

	shl	\$60,$tmp

	xor	($Htbl,$nlo),$Zhi

	and	\$0xf0,`&lo("$nhi")`

	and	\$0xf0,`&LB("$nhi")`

	xor	($rem_4bit,$rem,8),$Zhi

	mov	$Zlo,$rem

	xor	$tmp,$Zlo
@@ -120,7 +136,7 @@ $code.=<<___; 
	xor	8($Htbl,$nlo),$Zlo

	shl	\$60,$tmp

	xor	($Htbl,$nlo),$Zhi

	and	\$0xf0,`&lo("$nhi")`

	and	\$0xf0,`&LB("$nhi")`

	xor	($rem_4bit,$rem,8),$Zhi

	mov	$Zlo,$rem

	xor	$tmp,$Zlo
@@ -170,9 +186,7 @@ ___ 
# per-function register layout

$inp="%rdx";

$len="%rcx";



$cnt="%rbp";

$rem="%r12";

$rem_8bit=$rem_4bit;



$code.=<<___;

.globl	gcm_ghash_4bit
@@ -182,33 +196,145 @@ gcm_ghash_4bit: 
	push	%rbx

	push	%rbp

	push	%r12

	push	%r13

	push	%r14

	push	%r15

	sub	\$280,%rsp

.Lghash_prologue:



	mov	8($Xi),$Zlo

	mov	($Xi),$Zhi

	add	$inp,$len

	lea	.Lrem_4bit(%rip),$rem_4bit

.align	4

.Louter_loop:

	xor	8($inp),$Zlo

	xor	($inp),$Zhi

	lea	16($inp),$inp

	mov	$Zlo,8($Xi)

	mov	$Zhi,($Xi)

	shr	\$56,$Zlo

	mov	$inp,%r14		# reassign couple of args

	mov	$len,%r15

___

	&loop	($Xi);

$code.=<<___;

	cmp	$len,$inp

	jb	.Louter_loop

{ 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)



	mov	0(%rsp),%r12

	mov	8(%rsp),%rbp

	mov	16(%rsp),%rbx

	lea	24(%rsp),%rsp

	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
@@ -506,6 +632,41 @@ $code.=<<___; 
	.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

___