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dnl x86-32 mpn_mod_1s_4p for Pentium 4 and P6 models with SSE2 (i.e. 9,D,E,F).
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2009, 2010 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C TODO:
C * Optimize. The present code was written quite straightforwardly.
C * Optimize post-loop reduction code.
C * Write a cps function that uses sse2 insns.
C cycles/limb
C P6 model 0-8,10-12 -
C P6 model 9 (Banias) ?
C P6 model 13 (Dothan) 3.4
C P4 model 0-1 (Willamette) ?
C P4 model 2 (Northwood) 4
C P4 model 3-4 (Prescott) 4.5
C INPUT PARAMETERS
C ap sp + 4
C n sp + 8
C b sp + 12
C cps sp + 16
define(`B1modb', `%mm1')
define(`B2modb', `%mm2')
define(`B3modb', `%mm3')
define(`B4modb', `%mm4')
define(`B5modb', `%mm5')
define(`ap', `%edx')
define(`n', `%eax')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_mod_1s_4p)
push %ebx
mov 8(%esp), ap
mov 12(%esp), n
mov 20(%esp), %ecx
movd 8(%ecx), B1modb
movd 12(%ecx), B2modb
movd 16(%ecx), B3modb
movd 20(%ecx), B4modb
movd 24(%ecx), B5modb
mov n, %ebx
lea -4(ap,n,4), ap
and $3, %ebx
je L(b0)
cmp $2, %ebx
jc L(b1)
je L(b2)
L(b3): movd -4(ap), %mm7
pmuludq B1modb, %mm7
movd -8(ap), %mm6
paddq %mm6, %mm7
movd (ap), %mm6
pmuludq B2modb, %mm6
paddq %mm6, %mm7
lea -24(ap), ap
add $-3, n
jz L(end)
jmp L(top)
L(b0): movd -8(ap), %mm7
pmuludq B1modb, %mm7
movd -12(ap), %mm6
paddq %mm6, %mm7
movd -4(ap), %mm6
pmuludq B2modb, %mm6
paddq %mm6, %mm7
movd (ap), %mm6
pmuludq B3modb, %mm6
paddq %mm6, %mm7
lea -28(ap), ap
add $-4, n
jz L(end)
jmp L(top)
L(b1): movd (ap), %mm7
lea -16(ap), ap
dec n
jz L(x)
jmp L(top)
L(b2): movd -4(ap), %mm7 C rl
punpckldq (ap), %mm7 C rh
lea -20(ap), ap
add $-2, n
jz L(end)
ALIGN(8)
L(top): movd 4(ap), %mm0
pmuludq B1modb, %mm0
movd 0(ap), %mm6
paddq %mm6, %mm0
movd 8(ap), %mm6
pmuludq B2modb, %mm6
paddq %mm6, %mm0
movd 12(ap), %mm6
pmuludq B3modb, %mm6
paddq %mm6, %mm0
movq %mm7, %mm6
psrlq $32, %mm7 C rh
pmuludq B5modb, %mm7
pmuludq B4modb, %mm6
paddq %mm0, %mm7
paddq %mm6, %mm7
add $-16, ap
add $-4, n
jnz L(top)
L(end): pcmpeqd %mm4, %mm4
psrlq $32, %mm4 C 0x00000000FFFFFFFF
pand %mm7, %mm4 C rl
psrlq $32, %mm7 C rh
pmuludq B1modb, %mm7 C rh,cl
paddq %mm4, %mm7 C rh,rl
L(x): movd 4(%ecx), %mm4 C cnt
psllq %mm4, %mm7 C rh,rl normalized
movq %mm7, %mm2 C rl in low half
psrlq $32, %mm7 C rh
movd (%ecx), %mm1 C bi
pmuludq %mm7, %mm1 C qh,ql
paddq %mm2, %mm1 C qh-1,ql
movd %mm1, %ecx C ql
psrlq $32, %mm1 C qh-1
movd 16(%esp), %mm3 C b
pmuludq %mm1, %mm3 C (qh-1) * b
psubq %mm3, %mm2 C r in low half (could use psubd)
movd %mm2, %eax C r
mov 16(%esp), %ebx
sub %ebx, %eax C r
cmp %eax, %ecx
lea (%eax,%ebx), %edx
cmovc( %edx, %eax)
movd %mm4, %ecx C cnt
cmp %ebx, %eax
jae L(fix)
emms
pop %ebx
shr %cl, %eax
ret
L(fix): sub %ebx, %eax
emms
pop %ebx
shr %cl, %eax
ret
EPILOGUE()
ALIGN(16)
PROLOGUE(mpn_mod_1s_4p_cps)
C CAUTION: This is the same code as in k7/mod_1_4.asm
push %ebp
push %edi
push %esi
push %ebx
mov 20(%esp), %ebp C FIXME: avoid bp for 0-idx
mov 24(%esp), %ebx
bsr %ebx, %ecx
xor $31, %ecx
sal %cl, %ebx C b << cnt
mov %ebx, %edx
not %edx
mov $-1, %eax
div %ebx
xor %edi, %edi
sub %ebx, %edi
mov $1, %esi
mov %eax, (%ebp) C store bi
mov %ecx, 4(%ebp) C store cnt
shld %cl, %eax, %esi
imul %edi, %esi
mov %eax, %edi
mul %esi
add %esi, %edx
shr %cl, %esi
mov %esi, 8(%ebp) C store B1modb
not %edx
imul %ebx, %edx
lea (%edx,%ebx), %esi
cmp %edx, %eax
cmovnc( %edx, %esi)
mov %edi, %eax
mul %esi
add %esi, %edx
shr %cl, %esi
mov %esi, 12(%ebp) C store B2modb
not %edx
imul %ebx, %edx
lea (%edx,%ebx), %esi
cmp %edx, %eax
cmovnc( %edx, %esi)
mov %edi, %eax
mul %esi
add %esi, %edx
shr %cl, %esi
mov %esi, 16(%ebp) C store B3modb
not %edx
imul %ebx, %edx
lea (%edx,%ebx), %esi
cmp %edx, %eax
cmovnc( %edx, %esi)
mov %edi, %eax
mul %esi
add %esi, %edx
shr %cl, %esi
mov %esi, 20(%ebp) C store B4modb
not %edx
imul %ebx, %edx
add %edx, %ebx
cmp %edx, %eax
cmovnc( %edx, %ebx)
shr %cl, %ebx
mov %ebx, 24(%ebp) C store B5modb
pop %ebx
pop %esi
pop %edi
pop %ebp
ret
EPILOGUE()
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