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#! /usr/bin/env perl
# Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
#
# ====================================================================
# 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/.
# ====================================================================
#
# On 21264 RSA sign performance improves by 70/35/20/15 percent for
# 512/1024/2048/4096 bit key lengths. This is against vendor compiler
# instructed to '-tune host' code with in-line assembler. Other
# benchmarks improve by 15-20%. To anchor it to something else, the
# code provides approximately the same performance per GHz as AMD64.
# I.e. if you compare 1GHz 21264 and 2GHz Opteron, you'll observe ~2x
# difference.
$output=pop and open STDOUT,">$output";
# int bn_mul_mont(
$rp="a0"; # BN_ULONG *rp,
$ap="a1"; # const BN_ULONG *ap,
$bp="a2"; # const BN_ULONG *bp,
$np="a3"; # const BN_ULONG *np,
$n0="a4"; # const BN_ULONG *n0,
$num="a5"; # int num);
$lo0="t0";
$hi0="t1";
$lo1="t2";
$hi1="t3";
$aj="t4";
$bi="t5";
$nj="t6";
$tp="t7";
$alo="t8";
$ahi="t9";
$nlo="t10";
$nhi="t11";
$tj="t12";
$i="s3";
$j="s4";
$m1="s5";
$code=<<___;
#ifdef __linux__
#include <asm/regdef.h>
#else
#include <asm.h>
#include <regdef.h>
#endif
.text
.set noat
.set noreorder
.globl bn_mul_mont
.align 5
.ent bn_mul_mont
bn_mul_mont:
lda sp,-48(sp)
stq ra,0(sp)
stq s3,8(sp)
stq s4,16(sp)
stq s5,24(sp)
stq fp,32(sp)
mov sp,fp
.mask 0x0400f000,-48
.frame fp,48,ra
.prologue 0
.align 4
.set reorder
sextl $num,$num
mov 0,v0
cmplt $num,4,AT
bne AT,.Lexit
ldq $hi0,0($ap) # ap[0]
s8addq $num,16,AT
ldq $aj,8($ap)
subq sp,AT,sp
ldq $bi,0($bp) # bp[0]
lda AT,-4096(zero) # mov -4096,AT
ldq $n0,0($n0)
and sp,AT,sp
mulq $hi0,$bi,$lo0
ldq $hi1,0($np) # np[0]
umulh $hi0,$bi,$hi0
ldq $nj,8($np)
mulq $lo0,$n0,$m1
mulq $hi1,$m1,$lo1
umulh $hi1,$m1,$hi1
addq $lo1,$lo0,$lo1
cmpult $lo1,$lo0,AT
addq $hi1,AT,$hi1
mulq $aj,$bi,$alo
mov 2,$j
umulh $aj,$bi,$ahi
mov sp,$tp
mulq $nj,$m1,$nlo
s8addq $j,$ap,$aj
umulh $nj,$m1,$nhi
s8addq $j,$np,$nj
.align 4
.L1st:
.set noreorder
ldq $aj,0($aj)
addl $j,1,$j
ldq $nj,0($nj)
lda $tp,8($tp)
addq $alo,$hi0,$lo0
mulq $aj,$bi,$alo
cmpult $lo0,$hi0,AT
addq $nlo,$hi1,$lo1
mulq $nj,$m1,$nlo
addq $ahi,AT,$hi0
cmpult $lo1,$hi1,v0
cmplt $j,$num,$tj
umulh $aj,$bi,$ahi
addq $nhi,v0,$hi1
addq $lo1,$lo0,$lo1
s8addq $j,$ap,$aj
umulh $nj,$m1,$nhi
cmpult $lo1,$lo0,v0
addq $hi1,v0,$hi1
s8addq $j,$np,$nj
stq $lo1,-8($tp)
nop
unop
bne $tj,.L1st
.set reorder
addq $alo,$hi0,$lo0
addq $nlo,$hi1,$lo1
cmpult $lo0,$hi0,AT
cmpult $lo1,$hi1,v0
addq $ahi,AT,$hi0
addq $nhi,v0,$hi1
addq $lo1,$lo0,$lo1
cmpult $lo1,$lo0,v0
addq $hi1,v0,$hi1
stq $lo1,0($tp)
addq $hi1,$hi0,$hi1
cmpult $hi1,$hi0,AT
stq $hi1,8($tp)
stq AT,16($tp)
mov 1,$i
.align 4
.Louter:
s8addq $i,$bp,$bi
ldq $hi0,0($ap)
ldq $aj,8($ap)
ldq $bi,0($bi)
ldq $hi1,0($np)
ldq $nj,8($np)
ldq $tj,0(sp)
mulq $hi0,$bi,$lo0
umulh $hi0,$bi,$hi0
addq $lo0,$tj,$lo0
cmpult $lo0,$tj,AT
addq $hi0,AT,$hi0
mulq $lo0,$n0,$m1
mulq $hi1,$m1,$lo1
umulh $hi1,$m1,$hi1
addq $lo1,$lo0,$lo1
cmpult $lo1,$lo0,AT
mov 2,$j
addq $hi1,AT,$hi1
mulq $aj,$bi,$alo
mov sp,$tp
umulh $aj,$bi,$ahi
mulq $nj,$m1,$nlo
s8addq $j,$ap,$aj
umulh $nj,$m1,$nhi
.align 4
.Linner:
.set noreorder
ldq $tj,8($tp) #L0
nop #U1
ldq $aj,0($aj) #L1
s8addq $j,$np,$nj #U0
ldq $nj,0($nj) #L0
nop #U1
addq $alo,$hi0,$lo0 #L1
lda $tp,8($tp)
mulq $aj,$bi,$alo #U1
cmpult $lo0,$hi0,AT #L0
addq $nlo,$hi1,$lo1 #L1
addl $j,1,$j
mulq $nj,$m1,$nlo #U1
addq $ahi,AT,$hi0 #L0
addq $lo0,$tj,$lo0 #L1
cmpult $lo1,$hi1,v0 #U0
umulh $aj,$bi,$ahi #U1
cmpult $lo0,$tj,AT #L0
addq $lo1,$lo0,$lo1 #L1
addq $nhi,v0,$hi1 #U0
umulh $nj,$m1,$nhi #U1
s8addq $j,$ap,$aj #L0
cmpult $lo1,$lo0,v0 #L1
cmplt $j,$num,$tj #U0 # borrow $tj
addq $hi0,AT,$hi0 #L0
addq $hi1,v0,$hi1 #U1
stq $lo1,-8($tp) #L1
bne $tj,.Linner #U0
.set reorder
ldq $tj,8($tp)
addq $alo,$hi0,$lo0
addq $nlo,$hi1,$lo1
cmpult $lo0,$hi0,AT
cmpult $lo1,$hi1,v0
addq $ahi,AT,$hi0
addq $nhi,v0,$hi1
addq $lo0,$tj,$lo0
cmpult $lo0,$tj,AT
addq $hi0,AT,$hi0
ldq $tj,16($tp)
addq $lo1,$lo0,$j
cmpult $j,$lo0,v0
addq $hi1,v0,$hi1
addq $hi1,$hi0,$lo1
stq $j,0($tp)
cmpult $lo1,$hi0,$hi1
addq $lo1,$tj,$lo1
cmpult $lo1,$tj,AT
addl $i,1,$i
addq $hi1,AT,$hi1
stq $lo1,8($tp)
cmplt $i,$num,$tj # borrow $tj
stq $hi1,16($tp)
bne $tj,.Louter
s8addq $num,sp,$tj # &tp[num]
mov $rp,$bp # put rp aside
mov sp,$tp
mov sp,$ap
mov 0,$hi0 # clear borrow bit
.align 4
.Lsub: ldq $lo0,0($tp)
ldq $lo1,0($np)
lda $tp,8($tp)
lda $np,8($np)
subq $lo0,$lo1,$lo1 # tp[i]-np[i]
cmpult $lo0,$lo1,AT
subq $lo1,$hi0,$lo0
cmpult $lo1,$lo0,$hi0
or $hi0,AT,$hi0
stq $lo0,0($rp)
cmpult $tp,$tj,v0
lda $rp,8($rp)
bne v0,.Lsub
subq $hi1,$hi0,$hi0 # handle upmost overflow bit
mov sp,$tp
mov $bp,$rp # restore rp
.align 4
.Lcopy: ldq $aj,0($tp) # conditional copy
ldq $nj,0($rp)
lda $tp,8($tp)
lda $rp,8($rp)
cmoveq $hi0,$nj,$aj
stq zero,-8($tp) # zap tp
cmpult $tp,$tj,AT
stq $aj,-8($rp)
bne AT,.Lcopy
mov 1,v0
.Lexit:
.set noreorder
mov fp,sp
/*ldq ra,0(sp)*/
ldq s3,8(sp)
ldq s4,16(sp)
ldq s5,24(sp)
ldq fp,32(sp)
lda sp,48(sp)
ret (ra)
.end bn_mul_mont
.ascii "Montgomery Multiplication for Alpha, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
___
print $code;
close STDOUT or die "error closing STDOUT: $!";
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