Commit fba1ce71 authored by Niels Möller's avatar Niels Möller

*** empty log message ***

Rev: nettle/x86/sha1-f1-noexp.nlms:1.1
parent 8468ec92
/* The f1 phase of sha1, without expansion */
/* !!! arch x86_32 */
/* !!! signature n */
/* !!! count 0 mod 5 */
/* Run with loopmix -f -s -m -i -b sha1-f1-noexpand.nlms */
changequote(<,>)dnl
/* Current version can be loop-mixed down to 29 cycles. */
define(<SA>,<%eax>)
define(<SB>,<%ebx>)
define(<SC>,<%ecx>)
define(<SD>,<%edx>)
define(<SE>,<%ebp>)
define(<DATA>,<%esp>)
define(<T1>,<%edi>)
define(<T2>,<%esi>)
dnl define(<KVALUE>,<%esi>)
define(<COUNT>, <84(%esp)>)
define(<K1VALUE>, <0x5A827999>)
dnl Expands to 4*i, or to the empty string if i is zero
define(<OFFSET>, <ifelse($1,0,,eval(4*$1))>)
dnl The F1 round sets
dnl
dnl e += (a <<< 5) + (d ^ (b & (c ^ d))) + k + w
dnl
dnl Access inputs in order d, c, b, a, to give maximum time to
dnl have values ready.
dnl Current version can be loopmixed down to just over 4 cycles.
define(<ROUND_F1_NOEXP>, <
mov $4, T2
xor $3, T2
and $2, T2
xor $4, T2
rol <$>30, $2
mov $1, T1
rol <$>5, T1
add OFFSET($6) (DATA), $5
add T2, $5
lea K1VALUE (T1, $5), $5
>)
.text
.p2align 4,15
.globl loop_entry
loop_entry:
push %ebx
push %ebp
push %esi
push %edi
sub $64, %esp
.align 32
loop_begin:
ROUND_F1_NOEXP(SA, SB, SC, SD, SE, 20)
ROUND_F1_NOEXP(SE, SA, SB, SC, SD, 21)
ROUND_F1_NOEXP(SD, SE, SA, SB, SC, 22)
ROUND_F1_NOEXP(SC, SD, SE, SA, SB, 23)
ROUND_F1_NOEXP(SB, SC, SD, SE, SA, 24)
sub $5, COUNT
jnz loop_begin
loop_end:
add $64, %esp
pop %edi
pop %esi
pop %ebp
pop %ebx
ret
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