Commit 9ee020f8 authored by Andy Polyakov's avatar Andy Polyakov
Browse files

modes/asm/ghashv8-armx.pl: modulo-schedule loop. 



Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4830)
parent 7ff2fa4b

crypto/modes/asm/ghashv8-armx.pl

+70 −3
Original line number Diff line number Diff line
@@ -423,10 +423,7 @@ gcm_ghash_v8_4x: 
#ifndef __ARMEB__

	vrev64.8	$Xl,$Xl

#endif

	b		.Loop4x



.align	4

.Loop4x:

	vld1.64		{$I0-$j3},[$inp],#64

#ifndef __ARMEB__

	vrev64.8	$j1,$j1
@@ -461,6 +458,13 @@ gcm_ghash_v8_4x: 
	veor		$Yh,$Yh,$I1

	veor		$Ym,$Ym,$j1



	subs		$len,$len,#64

	b.eq		.Ltail4x



	b		.Loop4x



.align	4

.Loop4x:

	veor		$t0,$I0,$Xl

	vext.8		$IN,$t0,$t0,#8
@@ -489,9 +493,72 @@ gcm_ghash_v8_4x: 
	veor		$Xl,$Xl,$t2

	vext.8		$Xl,$Xl,$Xl,#8



	 vld1.64	{$I0-$j3},[$inp],#64

#ifndef __ARMEB__

	 vrev64.8	$j1,$j1

	 vrev64.8	$j2,$j2

	 vrev64.8	$j3,$j3

	 vrev64.8	$I0,$I0

#endif

	 vext.8		$I3,$j3,$j3,#8

	 vext.8		$I2,$j2,$j2,#8

	 vext.8		$I1,$j1,$j1,#8



	 vpmull.p64	$Yl,$H,$I3		@ H·Ii+3

	 veor		$j3,$j3,$I3

	 vpmull2.p64	$Yh,$H,$I3

	 vpmull.p64	$Ym,$Hhl,$j3



	 vpmull.p64	$t0,$H2,$I2		@ H^2·Ii+2

	 veor		$j2,$j2,$I2

	 vpmull2.p64	$I2,$H2,$I2

	 vpmull2.p64	$j2,$Hhl,$j2



	 veor		$Yl,$Yl,$t0

	 veor		$Yh,$Yh,$I2

	 veor		$Ym,$Ym,$j2



	 vpmull.p64	$j3,$H3,$I1		@ H^3·Ii+1

	 veor		$j1,$j1,$I1

	 vpmull2.p64	$I1,$H3,$I1

	 vpmull.p64	$j1,$H34,$j1



	 veor		$Yl,$Yl,$j3

	 veor		$Yh,$Yh,$I1

	 veor		$Ym,$Ym,$j1



	subs		$len,$len,#64

	b.ne		.Loop4x



.Ltail4x:

	veor		$t0,$I0,$Xl

	vext.8		$IN,$t0,$t0,#8



	vpmull.p64	$Xl,$H4,$IN		@ H^4·(Xi+Ii)

	veor		$t0,$t0,$IN

	vpmull2.p64	$Xh,$H4,$IN

	vpmull2.p64	$Xm,$H34,$t0



	veor		$Xl,$Xl,$Yl

	veor		$Xh,$Xh,$Yh

	veor		$Xm,$Xm,$Ym



	vext.8		$t1,$Xl,$Xh,#8		@ Karatsuba post-processing

	veor		$t2,$Xl,$Xh

	veor		$Xm,$Xm,$t1

	veor		$Xm,$Xm,$t2



	vpmull.p64	$t2,$Xl,$xC2		@ 1st phase of reduction

	vmov		$Xh#lo,$Xm#hi		@ Xh|Xm - 256-bit result

	vmov		$Xm#hi,$Xl#lo		@ Xm is rotated Xl

	veor		$Xl,$Xm,$t2



	vext.8		$t2,$Xl,$Xl,#8		@ 2nd phase of reduction

	vpmull.p64	$Xl,$Xl,$xC2

	veor		$t2,$t2,$Xh

	veor		$Xl,$Xl,$t2

	vext.8		$Xl,$Xl,$Xl,#8



#ifndef __ARMEB__

	vrev64.8	$Xl,$Xl

#endif