src/third_party/openssl/openssl/crypto/bn/asm/armv4-gf2m.pl - cobalt - 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/.
 # ====================================================================
 #
 # May 2011
 #
 # The module implements bn_GF2m_mul_2x2 polynomial multiplication
 # used in bn_gf2m.c. It's kind of low-hanging mechanical port from
 # C for the time being... Except that it has two code paths: pure
 # integer code suitable for any ARMv4 and later CPU and NEON code
 # suitable for ARMv7. Pure integer 1x1 multiplication subroutine runs
 # in ~45 cycles on dual-issue core such as Cortex A8, which is ~50%
 # faster than compiler-generated code. For ECDH and ECDSA verify (but
 # not for ECDSA sign) it means 25%-45% improvement depending on key
 # length, more for longer keys. Even though NEON 1x1 multiplication
 # runs in even less cycles, ~30, improvement is measurable only on
 # longer keys. One has to optimize code elsewhere to get NEON glow...

 while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
 open STDOUT,">$output";

 sub Dlo()   { shift=~m|q([1]?[0-9])|?"d".($1*2):"";     }
 sub Dhi()   { shift=~m|q([1]?[0-9])|?"d".($1*2+1):"";   }
 sub Q()     { shift=~m|d([1-3]?[02468])|?"q".($1/2):""; }

 $code=<<___;
 #include "arm_arch.h"

 .text
 .code	32

 #if __ARM_ARCH__>=7
 .fpu	neon

 .type	mul_1x1_neon,%function
 .align	5
 mul_1x1_neon:
 	vshl.u64	`&Dlo("q1")`,d16,#8	@ q1-q3 are slided $a
 	vmull.p8	`&Q("d0")`,d16,d17	@ a·bb
 	vshl.u64	`&Dlo("q2")`,d16,#16
 	vmull.p8	q1,`&Dlo("q1")`,d17	@ a<<8·bb
 	vshl.u64	`&Dlo("q3")`,d16,#24
 	vmull.p8	q2,`&Dlo("q2")`,d17	@ a<<16·bb
 	vshr.u64	`&Dlo("q1")`,#8
 	vmull.p8	q3,`&Dlo("q3")`,d17	@ a<<24·bb
 	vshl.u64	`&Dhi("q1")`,#24
 	veor		d0,`&Dlo("q1")`
 	vshr.u64	`&Dlo("q2")`,#16
 	veor		d0,`&Dhi("q1")`
 	vshl.u64	`&Dhi("q2")`,#16
 	veor		d0,`&Dlo("q2")`
 	vshr.u64	`&Dlo("q3")`,#24
 	veor		d0,`&Dhi("q2")`
 	vshl.u64	`&Dhi("q3")`,#8
 	veor		d0,`&Dlo("q3")`
 	veor		d0,`&Dhi("q3")`
 	bx	lr
 .size	mul_1x1_neon,.-mul_1x1_neon
 #endif
 ___
 ################
 # private interface to mul_1x1_ialu
 #
 $a="r1";
 $b="r0";

 ($a0,$a1,$a2,$a12,$a4,$a14)=
 ($hi,$lo,$t0,$t1, $i0,$i1 )=map("r$_",(4..9),12);

 $mask="r12";

 $code.=<<___;
 .type	mul_1x1_ialu,%function
 .align	5
 mul_1x1_ialu:
 	mov	$a0,#0
 	bic	$a1,$a,#3<<30		@ a1=a&0x3fffffff
 	str	$a0,[sp,#0]		@ tab[0]=0
 	add	$a2,$a1,$a1		@ a2=a1<<1
 	str	$a1,[sp,#4]		@ tab[1]=a1
 	eor	$a12,$a1,$a2		@ a1^a2
 	str	$a2,[sp,#8]		@ tab[2]=a2
 	mov	$a4,$a1,lsl#2		@ a4=a1<<2
 	str	$a12,[sp,#12]		@ tab[3]=a1^a2
 	eor	$a14,$a1,$a4		@ a1^a4
 	str	$a4,[sp,#16]		@ tab[4]=a4
 	eor	$a0,$a2,$a4		@ a2^a4
 	str	$a14,[sp,#20]		@ tab[5]=a1^a4
 	eor	$a12,$a12,$a4		@ a1^a2^a4
 	str	$a0,[sp,#24]		@ tab[6]=a2^a4
 	and	$i0,$mask,$b,lsl#2
 	str	$a12,[sp,#28]		@ tab[7]=a1^a2^a4

 	and	$i1,$mask,$b,lsr#1
 	ldr	$lo,[sp,$i0]		@ tab[b       & 0x7]
 	and	$i0,$mask,$b,lsr#4
 	ldr	$t1,[sp,$i1]		@ tab[b >>  3 & 0x7]
 	and	$i1,$mask,$b,lsr#7
 	ldr	$t0,[sp,$i0]		@ tab[b >>  6 & 0x7]
 	eor	$lo,$lo,$t1,lsl#3	@ stall
 	mov	$hi,$t1,lsr#29
 	ldr	$t1,[sp,$i1]		@ tab[b >>  9 & 0x7]

 	and	$i0,$mask,$b,lsr#10
 	eor	$lo,$lo,$t0,lsl#6
 	eor	$hi,$hi,$t0,lsr#26
 	ldr	$t0,[sp,$i0]		@ tab[b >> 12 & 0x7]

 	and	$i1,$mask,$b,lsr#13
 	eor	$lo,$lo,$t1,lsl#9
 	eor	$hi,$hi,$t1,lsr#23
 	ldr	$t1,[sp,$i1]		@ tab[b >> 15 & 0x7]

 	and	$i0,$mask,$b,lsr#16
 	eor	$lo,$lo,$t0,lsl#12
 	eor	$hi,$hi,$t0,lsr#20
 	ldr	$t0,[sp,$i0]		@ tab[b >> 18 & 0x7]

 	and	$i1,$mask,$b,lsr#19
 	eor	$lo,$lo,$t1,lsl#15
 	eor	$hi,$hi,$t1,lsr#17
 	ldr	$t1,[sp,$i1]		@ tab[b >> 21 & 0x7]

 	and	$i0,$mask,$b,lsr#22
 	eor	$lo,$lo,$t0,lsl#18
 	eor	$hi,$hi,$t0,lsr#14
 	ldr	$t0,[sp,$i0]		@ tab[b >> 24 & 0x7]

 	and	$i1,$mask,$b,lsr#25
 	eor	$lo,$lo,$t1,lsl#21
 	eor	$hi,$hi,$t1,lsr#11
 	ldr	$t1,[sp,$i1]		@ tab[b >> 27 & 0x7]

 	tst	$a,#1<<30
 	and	$i0,$mask,$b,lsr#28
 	eor	$lo,$lo,$t0,lsl#24
 	eor	$hi,$hi,$t0,lsr#8
 	ldr	$t0,[sp,$i0]		@ tab[b >> 30      ]

 	eorne	$lo,$lo,$b,lsl#30
 	eorne	$hi,$hi,$b,lsr#2
 	tst	$a,#1<<31
 	eor	$lo,$lo,$t1,lsl#27
 	eor	$hi,$hi,$t1,lsr#5
 	eorne	$lo,$lo,$b,lsl#31
 	eorne	$hi,$hi,$b,lsr#1
 	eor	$lo,$lo,$t0,lsl#30
 	eor	$hi,$hi,$t0,lsr#2

 	mov	pc,lr
 .size	mul_1x1_ialu,.-mul_1x1_ialu
 ___
 ################
 # void	bn_GF2m_mul_2x2(BN_ULONG *r,
 #	BN_ULONG a1,BN_ULONG a0,
 #	BN_ULONG b1,BN_ULONG b0);	# r[3..0]=a1a0·b1b0

 ($A1,$B1,$A0,$B0,$A1B1,$A0B0)=map("d$_",(18..23));

 $code.=<<___;
 .global	bn_GF2m_mul_2x2
 .type	bn_GF2m_mul_2x2,%function
 .align	5
 bn_GF2m_mul_2x2:
 #if __ARM_ARCH__>=7
 	ldr	r12,.LOPENSSL_armcap
 .Lpic:	ldr	r12,[pc,r12]
 	tst	r12,#1
 	beq	.Lialu

 	veor	$A1,$A1
 	vmov.32	$B1,r3,r3		@ two copies of b1
 	vmov.32	${A1}[0],r1		@ a1

 	veor	$A0,$A0
 	vld1.32	${B0}[],[sp,:32]	@ two copies of b0
 	vmov.32	${A0}[0],r2		@ a0
 	mov	r12,lr

 	vmov	d16,$A1
 	vmov	d17,$B1
 	bl	mul_1x1_neon		@ a1·b1
 	vmov	$A1B1,d0

 	vmov	d16,$A0
 	vmov	d17,$B0
 	bl	mul_1x1_neon		@ a0·b0
 	vmov	$A0B0,d0

 	veor	d16,$A0,$A1
 	veor	d17,$B0,$B1
 	veor	$A0,$A0B0,$A1B1
 	bl	mul_1x1_neon		@ (a0+a1)·(b0+b1)

 	veor	d0,$A0			@ (a0+a1)·(b0+b1)-a0·b0-a1·b1
 	vshl.u64 d1,d0,#32
 	vshr.u64 d0,d0,#32
 	veor	$A0B0,d1
 	veor	$A1B1,d0
 	vst1.32	{${A0B0}[0]},[r0,:32]!
 	vst1.32	{${A0B0}[1]},[r0,:32]!
 	vst1.32	{${A1B1}[0]},[r0,:32]!
 	vst1.32	{${A1B1}[1]},[r0,:32]
 	bx	r12
 .align	4
 .Lialu:
 #endif
 ___
 $ret="r10";	# reassigned 1st argument
 $code.=<<___;
 	stmdb	sp!,{r4-r10,lr}
 	mov	$ret,r0			@ reassign 1st argument
 	mov	$b,r3			@ $b=b1
 	ldr	r3,[sp,#32]		@ load b0
 	mov	$mask,#7<<2
 	sub	sp,sp,#32		@ allocate tab[8]

 	bl	mul_1x1_ialu		@ a1·b1
 	str	$lo,[$ret,#8]
 	str	$hi,[$ret,#12]

 	eor	$b,$b,r3		@ flip b0 and b1
 	 eor	$a,$a,r2		@ flip a0 and a1
 	eor	r3,r3,$b
 	 eor	r2,r2,$a
 	eor	$b,$b,r3
 	 eor	$a,$a,r2
 	bl	mul_1x1_ialu		@ a0·b0
 	str	$lo,[$ret]
 	str	$hi,[$ret,#4]

 	eor	$a,$a,r2
 	eor	$b,$b,r3
 	bl	mul_1x1_ialu		@ (a1+a0)·(b1+b0)
 ___
 @r=map("r$_",(6..9));
 $code.=<<___;
 	ldmia	$ret,{@r[0]-@r[3]}
 	eor	$lo,$lo,$hi
 	eor	$hi,$hi,@r[1]
 	eor	$lo,$lo,@r[0]
 	eor	$hi,$hi,@r[2]
 	eor	$lo,$lo,@r[3]
 	eor	$hi,$hi,@r[3]
 	str	$hi,[$ret,#8]
 	eor	$lo,$lo,$hi
 	add	sp,sp,#32		@ destroy tab[8]
 	str	$lo,[$ret,#4]

 #if __ARM_ARCH__>=5
 	ldmia	sp!,{r4-r10,pc}
 #else
 	ldmia	sp!,{r4-r10,lr}
 	tst	lr,#1
 	moveq	pc,lr			@ be binary compatible with V4, yet
 	bx	lr			@ interoperable with Thumb ISA:-)
 #endif
 .size	bn_GF2m_mul_2x2,.-bn_GF2m_mul_2x2
 #if __ARM_ARCH__>=7
 .align	5
 .LOPENSSL_armcap:
 .word	OPENSSL_armcap_P-(.Lpic+8)
 #endif
 .asciz	"GF(2^m) Multiplication for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>"
 .align	5

 .comm	OPENSSL_armcap_P,4,4
 ___

 $code =~ s/\`([^\`]*)\`/eval $1/gem;
 $code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm;    # make it possible to compile with -march=armv4
 print $code;
 close STDOUT;   # enforce flush
	#!/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/.
	# ====================================================================
	#
	# May 2011
	#
	# The module implements bn_GF2m_mul_2x2 polynomial multiplication
	# used in bn_gf2m.c. It's kind of low-hanging mechanical port from
	# C for the time being... Except that it has two code paths: pure
	# integer code suitable for any ARMv4 and later CPU and NEON code
	# suitable for ARMv7. Pure integer 1x1 multiplication subroutine runs
	# in ~45 cycles on dual-issue core such as Cortex A8, which is ~50%
	# faster than compiler-generated code. For ECDH and ECDSA verify (but
	# not for ECDSA sign) it means 25%-45% improvement depending on key
	# length, more for longer keys. Even though NEON 1x1 multiplication
	# runs in even less cycles, ~30, improvement is measurable only on
	# longer keys. One has to optimize code elsewhere to get NEON glow...

	while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
	open STDOUT,">$output";

	sub Dlo() { shift=~m\|q([1]?[0-9])\|?"d".($1*2):""; }
	sub Dhi() { shift=~m\|q([1]?[0-9])\|?"d".($1*2+1):""; }
	sub Q() { shift=~m\|d([1-3]?[02468])\|?"q".($1/2):""; }

	$code=<<___;
	#include "arm_arch.h"

	.text
	.code 32

	#if __ARM_ARCH__>=7
	.fpu neon

	.type mul_1x1_neon,%function
	.align 5
	mul_1x1_neon:
	vshl.u64 `&Dlo("q1")`,d16,#8 @ q1-q3 are slided $a
	vmull.p8 `&Q("d0")`,d16,d17 @ a·bb
	vshl.u64 `&Dlo("q2")`,d16,#16
	vmull.p8 q1,`&Dlo("q1")`,d17 @ a<<8·bb
	vshl.u64 `&Dlo("q3")`,d16,#24
	vmull.p8 q2,`&Dlo("q2")`,d17 @ a<<16·bb
	vshr.u64 `&Dlo("q1")`,#8
	vmull.p8 q3,`&Dlo("q3")`,d17 @ a<<24·bb
	vshl.u64 `&Dhi("q1")`,#24
	veor d0,`&Dlo("q1")`
	vshr.u64 `&Dlo("q2")`,#16
	veor d0,`&Dhi("q1")`
	vshl.u64 `&Dhi("q2")`,#16
	veor d0,`&Dlo("q2")`
	vshr.u64 `&Dlo("q3")`,#24
	veor d0,`&Dhi("q2")`
	vshl.u64 `&Dhi("q3")`,#8
	veor d0,`&Dlo("q3")`
	veor d0,`&Dhi("q3")`
	bx lr
	.size mul_1x1_neon,.-mul_1x1_neon
	#endif
	___
	################
	# private interface to mul_1x1_ialu
	#
	$a="r1";
	$b="r0";

	($a0,$a1,$a2,$a12,$a4,$a14)=
	($hi,$lo,$t0,$t1, $i0,$i1 )=map("r$_",(4..9),12);

	$mask="r12";

	$code.=<<___;
	.type mul_1x1_ialu,%function
	.align 5
	mul_1x1_ialu:
	mov $a0,#0
	bic $a1,$a,#3<<30 @ a1=a&0x3fffffff
	str $a0,[sp,#0] @ tab[0]=0
	add $a2,$a1,$a1 @ a2=a1<<1
	str $a1,[sp,#4] @ tab[1]=a1
	eor $a12,$a1,$a2 @ a1^a2
	str $a2,[sp,#8] @ tab[2]=a2
	mov $a4,$a1,lsl#2 @ a4=a1<<2
	str $a12,[sp,#12] @ tab[3]=a1^a2
	eor $a14,$a1,$a4 @ a1^a4
	str $a4,[sp,#16] @ tab[4]=a4
	eor $a0,$a2,$a4 @ a2^a4
	str $a14,[sp,#20] @ tab[5]=a1^a4
	eor $a12,$a12,$a4 @ a1^a2^a4
	str $a0,[sp,#24] @ tab[6]=a2^a4
	and $i0,$mask,$b,lsl#2
	str $a12,[sp,#28] @ tab[7]=a1^a2^a4

	and $i1,$mask,$b,lsr#1
	ldr $lo,[sp,$i0] @ tab[b & 0x7]
	and $i0,$mask,$b,lsr#4
	ldr $t1,[sp,$i1] @ tab[b >> 3 & 0x7]
	and $i1,$mask,$b,lsr#7
	ldr $t0,[sp,$i0] @ tab[b >> 6 & 0x7]
	eor $lo,$lo,$t1,lsl#3 @ stall
	mov $hi,$t1,lsr#29
	ldr $t1,[sp,$i1] @ tab[b >> 9 & 0x7]

	and $i0,$mask,$b,lsr#10
	eor $lo,$lo,$t0,lsl#6
	eor $hi,$hi,$t0,lsr#26
	ldr $t0,[sp,$i0] @ tab[b >> 12 & 0x7]

	and $i1,$mask,$b,lsr#13
	eor $lo,$lo,$t1,lsl#9
	eor $hi,$hi,$t1,lsr#23
	ldr $t1,[sp,$i1] @ tab[b >> 15 & 0x7]

	and $i0,$mask,$b,lsr#16
	eor $lo,$lo,$t0,lsl#12
	eor $hi,$hi,$t0,lsr#20
	ldr $t0,[sp,$i0] @ tab[b >> 18 & 0x7]

	and $i1,$mask,$b,lsr#19
	eor $lo,$lo,$t1,lsl#15
	eor $hi,$hi,$t1,lsr#17
	ldr $t1,[sp,$i1] @ tab[b >> 21 & 0x7]

	and $i0,$mask,$b,lsr#22
	eor $lo,$lo,$t0,lsl#18
	eor $hi,$hi,$t0,lsr#14
	ldr $t0,[sp,$i0] @ tab[b >> 24 & 0x7]

	and $i1,$mask,$b,lsr#25
	eor $lo,$lo,$t1,lsl#21
	eor $hi,$hi,$t1,lsr#11
	ldr $t1,[sp,$i1] @ tab[b >> 27 & 0x7]

	tst $a,#1<<30
	and $i0,$mask,$b,lsr#28
	eor $lo,$lo,$t0,lsl#24
	eor $hi,$hi,$t0,lsr#8
	ldr $t0,[sp,$i0] @ tab[b >> 30 ]

	eorne $lo,$lo,$b,lsl#30
	eorne $hi,$hi,$b,lsr#2
	tst $a,#1<<31
	eor $lo,$lo,$t1,lsl#27
	eor $hi,$hi,$t1,lsr#5
	eorne $lo,$lo,$b,lsl#31
	eorne $hi,$hi,$b,lsr#1
	eor $lo,$lo,$t0,lsl#30
	eor $hi,$hi,$t0,lsr#2

	mov pc,lr
	.size mul_1x1_ialu,.-mul_1x1_ialu
	___
	################
	# void bn_GF2m_mul_2x2(BN_ULONG *r,
	# BN_ULONG a1,BN_ULONG a0,
	# BN_ULONG b1,BN_ULONG b0); # r[3..0]=a1a0·b1b0

	($A1,$B1,$A0,$B0,$A1B1,$A0B0)=map("d$_",(18..23));

	$code.=<<___;
	.global bn_GF2m_mul_2x2
	.type bn_GF2m_mul_2x2,%function
	.align 5
	bn_GF2m_mul_2x2:
	#if __ARM_ARCH__>=7
	ldr r12,.LOPENSSL_armcap
	.Lpic: ldr r12,[pc,r12]
	tst r12,#1
	beq .Lialu

	veor $A1,$A1
	vmov.32 $B1,r3,r3 @ two copies of b1
	vmov.32 ${A1}[0],r1 @ a1

	veor $A0,$A0
	vld1.32 ${B0}[],[sp,:32] @ two copies of b0
	vmov.32 ${A0}[0],r2 @ a0
	mov r12,lr

	vmov d16,$A1
	vmov d17,$B1
	bl mul_1x1_neon @ a1·b1
	vmov $A1B1,d0

	vmov d16,$A0
	vmov d17,$B0
	bl mul_1x1_neon @ a0·b0
	vmov $A0B0,d0

	veor d16,$A0,$A1
	veor d17,$B0,$B1
	veor $A0,$A0B0,$A1B1
	bl mul_1x1_neon @ (a0+a1)·(b0+b1)

	veor d0,$A0 @ (a0+a1)·(b0+b1)-a0·b0-a1·b1
	vshl.u64 d1,d0,#32
	vshr.u64 d0,d0,#32
	veor $A0B0,d1
	veor $A1B1,d0
	vst1.32 {${A0B0}[0]},[r0,:32]!
	vst1.32 {${A0B0}[1]},[r0,:32]!
	vst1.32 {${A1B1}[0]},[r0,:32]!
	vst1.32 {${A1B1}[1]},[r0,:32]
	bx r12
	.align 4
	.Lialu:
	#endif
	___
	$ret="r10"; # reassigned 1st argument
	$code.=<<___;
	stmdb sp!,{r4-r10,lr}
	mov $ret,r0 @ reassign 1st argument
	mov $b,r3 @ $b=b1
	ldr r3,[sp,#32] @ load b0
	mov $mask,#7<<2
	sub sp,sp,#32 @ allocate tab[8]

	bl mul_1x1_ialu @ a1·b1
	str $lo,[$ret,#8]
	str $hi,[$ret,#12]

	eor $b,$b,r3 @ flip b0 and b1
	eor $a,$a,r2 @ flip a0 and a1
	eor r3,r3,$b
	eor r2,r2,$a
	eor $b,$b,r3
	eor $a,$a,r2
	bl mul_1x1_ialu @ a0·b0
	str $lo,[$ret]
	str $hi,[$ret,#4]

	eor $a,$a,r2
	eor $b,$b,r3
	bl mul_1x1_ialu @ (a1+a0)·(b1+b0)
	___
	@r=map("r$_",(6..9));
	$code.=<<___;
	ldmia $ret,{@r[0]-@r[3]}
	eor $lo,$lo,$hi
	eor $hi,$hi,@r[1]
	eor $lo,$lo,@r[0]
	eor $hi,$hi,@r[2]
	eor $lo,$lo,@r[3]
	eor $hi,$hi,@r[3]
	str $hi,[$ret,#8]
	eor $lo,$lo,$hi
	add sp,sp,#32 @ destroy tab[8]
	str $lo,[$ret,#4]

	#if __ARM_ARCH__>=5
	ldmia sp!,{r4-r10,pc}
	#else
	ldmia sp!,{r4-r10,lr}
	tst lr,#1
	moveq pc,lr @ be binary compatible with V4, yet
	bx lr @ interoperable with Thumb ISA:-)
	#endif
	.size bn_GF2m_mul_2x2,.-bn_GF2m_mul_2x2
	#if __ARM_ARCH__>=7
	.align 5
	.LOPENSSL_armcap:
	.word OPENSSL_armcap_P-(.Lpic+8)
	#endif
	.asciz "GF(2^m) Multiplication for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>"
	.align 5

	.comm OPENSSL_armcap_P,4,4
	___

	$code =~ s/\`([^\`]*)\`/eval $1/gem;
	$code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm; # make it possible to compile with -march=armv4
	print $code;
	close STDOUT; # enforce flush