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openssl/crypto/sha/asm/sha1-armv4-large.pl

Index: openssl/crypto/sha/asm/sha1-armv4-large.pl
===================================================================
--- openssl/crypto/sha/asm/sha1-armv4-large.pl	(revision 0)
+++ openssl/crypto/sha/asm/sha1-armv4-large.pl	(revision 0)
@@ -0,0 +1,229 @@
+#!/usr/bin/env perl
+
+# ====================================================================
+# Written by Andy Polyakov <appro@fy.chalmers.se> 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/.
+# ====================================================================
+
+# sha1_block procedure for ARMv4.
+#
+# January 2007.
+
+# Size/performance trade-off
+# ====================================================================
+# impl		size in bytes	comp cycles[*]	measured performance
+# ====================================================================
+# thumb		304		3212		4420
+# armv4-small	392/+29%	1958/+64%	2250/+96%
+# armv4-compact	740/+89%	1552/+26%	1840/+22%
+# armv4-large	1420/+92%	1307/+19%	1370/+34%[***]
+# full unroll	~5100/+260%	~1260/+4%	~1300/+5%
+# ====================================================================
+# thumb		= same as 'small' but in Thumb instructions[**] and
+#		  with recurring code in two private functions;
+# small		= detached Xload/update, loops are folded;
+# compact	= detached Xload/update, 5x unroll;
+# large		= interleaved Xload/update, 5x unroll;
+# full unroll	= interleaved Xload/update, full unroll, estimated[!];
+#
+# [*]	Manually counted instructions in "grand" loop body. Measured
+#	performance is affected by prologue and epilogue overhead,
+#	i-cache availability, branch penalties, etc.
+# [**]	While each Thumb instruction is twice smaller, they are not as
+#	diverse as ARM ones: e.g., there are only two arithmetic
+#	instructions with 3 arguments, no [fixed] rotate, addressing
+#	modes are limited. As result it takes more instructions to do
+#	the same job in Thumb, therefore the code is never twice as
+#	small and always slower.
+# [***]	which is also ~35% better than compiler generated code. Dual-
+#	issue Cortex A8 core was measured to process input block in
+#	~990 cycles.
+
+# August 2010.
+#
+# Rescheduling for dual-issue pipeline resulted in 13% improvement on
+# Cortex A8 core and in absolute terms ~870 cycles per input block
+# [or 13.6 cycles per byte].
+
+
+while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
+open STDOUT,">$output";
+
+$ctx="r0";
+$inp="r1";
+$len="r2";
+$a="r3";
+$b="r4";
+$c="r5";
+$d="r6";
+$e="r7";
+$K="r8";
+$t0="r9";
+$t1="r10";
+$t2="r11";
+$t3="r12";
+$Xi="r14";
+@V=($a,$b,$c,$d,$e);
+
+sub Xupdate {
+my ($a,$b,$c,$d,$e,$opt1,$opt2)=@_;
+$code.=<<___;
+	ldr	$t0,[$Xi,#15*4]
+	ldr	$t1,[$Xi,#13*4]
+	ldr	$t2,[$Xi,#7*4]
+	add	$e,$K,$e,ror#2			@ E+=K_xx_xx
+	ldr	$t3,[$Xi,#2*4]
+	eor	$t0,$t0,$t1
+	eor	$t2,$t2,$t3
+	eor	$t1,$c,$d			@ F_xx_xx
+	mov	$t0,$t0,ror#31
+	add	$e,$e,$a,ror#27			@ E+=ROR(A,27)
+	eor	$t0,$t0,$t2,ror#31
+	$opt1					@ F_xx_xx
+	$opt2					@ F_xx_xx
+	add	$e,$e,$t0			@ E+=X[i]
+	str	$t0,[$Xi,#-4]!
+___
+}
+
+sub BODY_00_15 {
+my ($a,$b,$c,$d,$e)=@_;
+$code.=<<___;
+	ldrb	$t0,[$inp],#4
+	ldrb	$t1,[$inp,#-1]
+	ldrb	$t2,[$inp,#-2]
+	add	$e,$K,$e,ror#2			@ E+=K_00_19
+	ldrb	$t3,[$inp,#-3]
+	add	$e,$e,$a,ror#27			@ E+=ROR(A,27)
+	orr	$t0,$t1,$t0,lsl#24
+	eor	$t1,$c,$d			@ F_xx_xx
+	orr	$t0,$t0,$t2,lsl#8
+	orr	$t0,$t0,$t3,lsl#16
+	and	$t1,$b,$t1,ror#2
+	add	$e,$e,$t0			@ E+=X[i]
+	eor	$t1,$t1,$d,ror#2		@ F_00_19(B,C,D)
+	str	$t0,[$Xi,#-4]!
+	add	$e,$e,$t1			@ E+=F_00_19(B,C,D)
+___
+}
+
+sub BODY_16_19 {
+my ($a,$b,$c,$d,$e)=@_;
+	&Xupdate(@_,"and $t1,$b,$t1,ror#2");
+$code.=<<___;
+	eor	$t1,$t1,$d,ror#2		@ F_00_19(B,C,D)
+	add	$e,$e,$t1			@ E+=F_00_19(B,C,D)
+___
+}
+
+sub BODY_20_39 {
+my ($a,$b,$c,$d,$e)=@_;
+	&Xupdate(@_,"eor $t1,$b,$t1,ror#2");
+$code.=<<___;
+	add	$e,$e,$t1			@ E+=F_20_39(B,C,D)
+___
+}
+
+sub BODY_40_59 {
+my ($a,$b,$c,$d,$e)=@_;
+	&Xupdate(@_,"and $t1,$b,$t1,ror#2","and $t2,$c,$d");
+$code.=<<___;
+	add	$e,$e,$t1			@ E+=F_40_59(B,C,D)
+	add	$e,$e,$t2,ror#2
+___
+}
+
+$code=<<___;
+.text
+
+.global	sha1_block_data_order
+.type	sha1_block_data_order,%function
+
+.align	2
+sha1_block_data_order:
+	stmdb	sp!,{r4-r12,lr}
+	add	$len,$inp,$len,lsl#6	@ $len to point at the end of $inp
+	ldmia	$ctx,{$a,$b,$c,$d,$e}
+.Lloop:
+	ldr	$K,.LK_00_19
+	mov	$Xi,sp
+	sub	sp,sp,#15*4
+	mov	$c,$c,ror#30
+	mov	$d,$d,ror#30
+	mov	$e,$e,ror#30		@ [6]
+.L_00_15:
+___
+for($i=0;$i<5;$i++) {
+	&BODY_00_15(@V);	unshift(@V,pop(@V));
+}
+$code.=<<___;
+	teq	$Xi,sp
+	bne	.L_00_15		@ [((11+4)*5+2)*3]
+	sub	sp,sp,#5*4
+___
+	&BODY_00_15(@V);	unshift(@V,pop(@V));
+	&BODY_16_19(@V);	unshift(@V,pop(@V));
+	&BODY_16_19(@V);	unshift(@V,pop(@V));
+	&BODY_16_19(@V);	unshift(@V,pop(@V));
+	&BODY_16_19(@V);	unshift(@V,pop(@V));
+$code.=<<___;
+
+	ldr	$K,.LK_20_39		@ [+15+16*4]
+	sub	sp,sp,#20*4
+	cmn	sp,#0			@ [+3], clear carry to denote 20_39
+.L_20_39_or_60_79:
+___
+for($i=0;$i<5;$i++) {
+	&BODY_20_39(@V);	unshift(@V,pop(@V));
+}
+$code.=<<___;
+	teq	$Xi,sp			@ preserve carry
+	bne	.L_20_39_or_60_79	@ [+((12+3)*5+2)*4]
+	bcs	.L_done			@ [+((12+3)*5+2)*4], spare 300 bytes
+
+	ldr	$K,.LK_40_59
+	sub	sp,sp,#20*4		@ [+2]
+.L_40_59:
+___
+for($i=0;$i<5;$i++) {
+	&BODY_40_59(@V);	unshift(@V,pop(@V));
+}
+$code.=<<___;
+	teq	$Xi,sp
+	bne	.L_40_59		@ [+((12+5)*5+2)*4]
+
+	ldr	$K,.LK_60_79
+	sub	sp,sp,#20*4
+	cmp	sp,#0			@ set carry to denote 60_79
+	b	.L_20_39_or_60_79	@ [+4], spare 300 bytes
+.L_done:
+	add	sp,sp,#80*4		@ "deallocate" stack frame
+	ldmia	$ctx,{$K,$t0,$t1,$t2,$t3}
+	add	$a,$K,$a
+	add	$b,$t0,$b
+	add	$c,$t1,$c,ror#2
+	add	$d,$t2,$d,ror#2
+	add	$e,$t3,$e,ror#2
+	stmia	$ctx,{$a,$b,$c,$d,$e}
+	teq	$inp,$len
+	bne	.Lloop			@ [+18], total 1307
+
+	ldmia	sp!,{r4-r12,lr}
+	tst	lr,#1
+	moveq	pc,lr			@ be binary compatible with V4, yet
+	bx	lr			@ interoperable with Thumb ISA:-)
+.align	2
+.LK_00_19:	.word	0x5a827999
+.LK_20_39:	.word	0x6ed9eba1
+.LK_40_59:	.word	0x8f1bbcdc
+.LK_60_79:	.word	0xca62c1d6
+.size	sha1_block_data_order,.-sha1_block_data_order
+.asciz	"SHA1 block transform for ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
+.align	2
+___
+
+$code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm;	# make it possible to compile with -march=armv4
+print $code;
+close STDOUT; # enforce flush