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openssl/crypto/bn/asm/s390x-mont.pl

Index: openssl/crypto/bn/asm/s390x-mont.pl
===================================================================
--- openssl/crypto/bn/asm/s390x-mont.pl	(revision 0)
+++ openssl/crypto/bn/asm/s390x-mont.pl	(revision 0)
@@ -0,0 +1,225 @@
+#!/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/.
+# ====================================================================
+
+# April 2007.
+#
+# Performance improvement over vanilla C code varies from 85% to 45%
+# depending on key length and benchmark. Unfortunately in this context
+# these are not very impressive results [for code that utilizes "wide"
+# 64x64=128-bit multiplication, which is not commonly available to C
+# programmers], at least hand-coded bn_asm.c replacement is known to
+# provide 30-40% better results for longest keys. Well, on a second
+# thought it's not very surprising, because z-CPUs are single-issue
+# and _strictly_ in-order execution, while bn_mul_mont is more or less
+# dependent on CPU ability to pipe-line instructions and have several
+# of them "in-flight" at the same time. I mean while other methods,
+# for example Karatsuba, aim to minimize amount of multiplications at
+# the cost of other operations increase, bn_mul_mont aim to neatly
+# "overlap" multiplications and the other operations [and on most
+# platforms even minimize the amount of the other operations, in
+# particular references to memory]. But it's possible to improve this
+# module performance by implementing dedicated squaring code-path and
+# possibly by unrolling loops...
+
+# January 2009.
+#
+# Reschedule to minimize/avoid Address Generation Interlock hazard,
+# make inner loops counter-based.
+
+$mn0="%r0";
+$num="%r1";
+
+# int bn_mul_mont(
+$rp="%r2";		# BN_ULONG *rp,
+$ap="%r3";		# const BN_ULONG *ap,
+$bp="%r4";		# const BN_ULONG *bp,
+$np="%r5";		# const BN_ULONG *np,
+$n0="%r6";		# const BN_ULONG *n0,
+#$num="160(%r15)"	# int num);
+
+$bi="%r2";	# zaps rp
+$j="%r7";
+
+$ahi="%r8";
+$alo="%r9";
+$nhi="%r10";
+$nlo="%r11";
+$AHI="%r12";
+$NHI="%r13";
+$count="%r14";
+$sp="%r15";
+
+$code.=<<___;
+.text
+.globl	bn_mul_mont
+.type	bn_mul_mont,\@function
+bn_mul_mont:
+	lgf	$num,164($sp)	# pull $num
+	sla	$num,3		# $num to enumerate bytes
+	la	$bp,0($num,$bp)
+
+	stg	%r2,16($sp)
+
+	cghi	$num,16		#
+	lghi	%r2,0		#
+	blr	%r14		# if($num<16) return 0;
+	cghi	$num,96		#
+	bhr	%r14		# if($num>96) return 0;
+
+	stmg	%r3,%r15,24($sp)
+
+	lghi	$rp,-160-8	# leave room for carry bit
+	lcgr	$j,$num		# -$num
+	lgr	%r0,$sp
+	la	$rp,0($rp,$sp)
+	la	$sp,0($j,$rp)	# alloca
+	stg	%r0,0($sp)	# back chain
+
+	sra	$num,3		# restore $num
+	la	$bp,0($j,$bp)	# restore $bp
+	ahi	$num,-1		# adjust $num for inner loop
+	lg	$n0,0($n0)	# pull n0
+
+	lg	$bi,0($bp)
+	lg	$alo,0($ap)
+	mlgr	$ahi,$bi	# ap[0]*bp[0]
+	lgr	$AHI,$ahi
+
+	lgr	$mn0,$alo	# "tp[0]"*n0
+	msgr	$mn0,$n0
+
+	lg	$nlo,0($np)	#
+	mlgr	$nhi,$mn0	# np[0]*m1
+	algr	$nlo,$alo	# +="tp[0]"
+	lghi	$NHI,0
+	alcgr	$NHI,$nhi
+
+	la	$j,8(%r0)	# j=1
+	lr	$count,$num
+
+.align	16
+.L1st:
+	lg	$alo,0($j,$ap)
+	mlgr	$ahi,$bi	# ap[j]*bp[0]
+	algr	$alo,$AHI
+	lghi	$AHI,0
+	alcgr	$AHI,$ahi
+
+	lg	$nlo,0($j,$np)
+	mlgr	$nhi,$mn0	# np[j]*m1
+	algr	$nlo,$NHI
+	lghi	$NHI,0
+	alcgr	$nhi,$NHI	# +="tp[j]"
+	algr	$nlo,$alo
+	alcgr	$NHI,$nhi
+
+	stg	$nlo,160-8($j,$sp)	# tp[j-1]=
+	la	$j,8($j)	# j++
+	brct	$count,.L1st
+
+	algr	$NHI,$AHI
+	lghi	$AHI,0
+	alcgr	$AHI,$AHI	# upmost overflow bit
+	stg	$NHI,160-8($j,$sp)
+	stg	$AHI,160($j,$sp)
+	la	$bp,8($bp)	# bp++
+
+.Louter:
+	lg	$bi,0($bp)	# bp[i]
+	lg	$alo,0($ap)
+	mlgr	$ahi,$bi	# ap[0]*bp[i]
+	alg	$alo,160($sp)	# +=tp[0]
+	lghi	$AHI,0
+	alcgr	$AHI,$ahi
+
+	lgr	$mn0,$alo
+	msgr	$mn0,$n0	# tp[0]*n0
+
+	lg	$nlo,0($np)	# np[0]
+	mlgr	$nhi,$mn0	# np[0]*m1
+	algr	$nlo,$alo	# +="tp[0]"
+	lghi	$NHI,0
+	alcgr	$NHI,$nhi
+
+	la	$j,8(%r0)	# j=1
+	lr	$count,$num
+
+.align	16
+.Linner:
+	lg	$alo,0($j,$ap)
+	mlgr	$ahi,$bi	# ap[j]*bp[i]
+	algr	$alo,$AHI
+	lghi	$AHI,0
+	alcgr	$ahi,$AHI
+	alg	$alo,160($j,$sp)# +=tp[j]
+	alcgr	$AHI,$ahi
+
+	lg	$nlo,0($j,$np)
+	mlgr	$nhi,$mn0	# np[j]*m1
+	algr	$nlo,$NHI
+	lghi	$NHI,0
+	alcgr	$nhi,$NHI
+	algr	$nlo,$alo	# +="tp[j]"
+	alcgr	$NHI,$nhi
+
+	stg	$nlo,160-8($j,$sp)	# tp[j-1]=
+	la	$j,8($j)	# j++
+	brct	$count,.Linner
+
+	algr	$NHI,$AHI
+	lghi	$AHI,0
+	alcgr	$AHI,$AHI
+	alg	$NHI,160($j,$sp)# accumulate previous upmost overflow bit
+	lghi	$ahi,0
+	alcgr	$AHI,$ahi	# new upmost overflow bit
+	stg	$NHI,160-8($j,$sp)
+	stg	$AHI,160($j,$sp)
+
+	la	$bp,8($bp)	# bp++
+	clg	$bp,160+8+32($j,$sp)	# compare to &bp[num]
+	jne	.Louter
+
+	lg	$rp,160+8+16($j,$sp)	# reincarnate rp
+	la	$ap,160($sp)
+	ahi	$num,1		# restore $num, incidentally clears "borrow"
+
+	la	$j,0(%r0)
+	lr	$count,$num
+.Lsub:	lg	$alo,0($j,$ap)
+	slbg	$alo,0($j,$np)
+	stg	$alo,0($j,$rp)
+	la	$j,8($j)
+	brct	$count,.Lsub
+	lghi	$ahi,0
+	slbgr	$AHI,$ahi	# handle upmost carry
+
+	ngr	$ap,$AHI
+	lghi	$np,-1
+	xgr	$np,$AHI
+	ngr	$np,$rp
+	ogr	$ap,$np		# ap=borrow?tp:rp
+
+	la	$j,0(%r0)
+	lgr	$count,$num
+.Lcopy:	lg	$alo,0($j,$ap)	# copy or in-place refresh
+	stg	$j,160($j,$sp)	# zap tp
+	stg	$alo,0($j,$rp)
+	la	$j,8($j)
+	brct	$count,.Lcopy
+
+	la	%r1,160+8+48($j,$sp)
+	lmg	%r6,%r15,0(%r1)
+	lghi	%r2,1		# signal "processed"
+	br	%r14
+.size	bn_mul_mont,.-bn_mul_mont
+.string	"Montgomery Multiplication for s390x, CRYPTOGAMS by <appro\@openssl.org>"
+___
+
+print $code;
+close STDOUT;