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dnl Intel Atom mpn_lshift -- mpn left shift.
dnl Copyright 2011 Free Software Foundation, Inc.
dnl Contributed to the GNU project by Torbjorn Granlund and Marco Bodrato.
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
dnl modify it under the terms of the GNU Lesser General Public License as
dnl published by the Free Software Foundation; either version 3 of the
dnl License, or (at your option) any later version.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C mp_limb_t mpn_lshift (mp_ptr dst, mp_srcptr src, mp_size_t size,
C unsigned cnt);
C cycles/limb
C cnt!=1 cnt==1
C P5
C P6 model 0-8,10-12
C P6 model 9 (Banias)
C P6 model 13 (Dothan)
C P4 model 0 (Willamette)
C P4 model 1 (?)
C P4 model 2 (Northwood)
C P4 model 3 (Prescott)
C P4 model 4 (Nocona)
C Intel Atom 5 2.5
C AMD K6
C AMD K7
C AMD K8
C AMD K10
defframe(PARAM_CNT, 16)
defframe(PARAM_SIZE,12)
defframe(PARAM_SRC, 8)
defframe(PARAM_DST, 4)
dnl re-use parameter space
define(SAVE_UP,`PARAM_CNT')
define(VAR_COUNT,`PARAM_SIZE')
define(SAVE_EBX,`PARAM_SRC')
define(SAVE_EBP,`PARAM_DST')
define(`rp', `%edi')
define(`up', `%esi')
define(`cnt', `%ecx')
ASM_START()
TEXT
ALIGN(8)
deflit(`FRAME',0)
PROLOGUE(mpn_lshift)
mov PARAM_CNT, cnt
mov PARAM_SIZE, %edx
mov up, SAVE_UP
mov PARAM_SRC, up
push rp FRAME_pushl()
mov PARAM_DST, rp
C We can use faster code for shift-by-1 under certain conditions.
cmp $1,cnt
jne L(normal)
cmpl rp, up
jnc L(special) C jump if s_ptr + 1 >= res_ptr
leal (up,%edx,4),%eax
cmpl %eax,rp
jnc L(special) C jump if res_ptr >= s_ptr + size
L(normal):
lea -4(up,%edx,4), up
mov %ebx, SAVE_EBX
lea -4(rp,%edx,4), rp
shr %edx
mov (up), %eax
mov %edx, VAR_COUNT
jnc L(evn)
mov %eax, %ebx
shl %cl, %ebx
neg cnt
shr %cl, %eax
test %edx, %edx
jnz L(gt1)
mov %ebx, (rp)
jmp L(quit)
L(gt1): mov %ebp, SAVE_EBP
push %eax
mov -4(up), %eax
mov %eax, %ebp
shr %cl, %eax
jmp L(lo1)
L(evn): mov %ebp, SAVE_EBP
neg cnt
mov %eax, %ebp
mov -4(up), %edx
shr %cl, %eax
mov %edx, %ebx
shr %cl, %edx
neg cnt
decl VAR_COUNT
lea 4(rp), rp
lea -4(up), up
jz L(end)
push %eax FRAME_pushl()
ALIGN(8)
L(top): shl %cl, %ebp
or %ebp, %edx
shl %cl, %ebx
neg cnt
mov -4(up), %eax
mov %eax, %ebp
mov %edx, -4(rp)
shr %cl, %eax
lea -8(rp), rp
L(lo1): mov -8(up), %edx
or %ebx, %eax
mov %edx, %ebx
shr %cl, %edx
lea -8(up), up
neg cnt
mov %eax, (rp)
decl VAR_COUNT
jg L(top)
pop %eax FRAME_popl()
L(end):
shl %cl, %ebp
shl %cl, %ebx
or %ebp, %edx
mov SAVE_EBP, %ebp
mov %edx, -4(rp)
mov %ebx, -8(rp)
L(quit):
mov SAVE_UP, up
mov SAVE_EBX, %ebx
pop rp FRAME_popl()
ret
L(special):
deflit(`FRAME',4)
lea 3(%edx), %eax C size + 3
dec %edx C size - 1
mov (up), %ecx
shr $2, %eax C (size + 3) / 4
and $3, %edx C (size - 1) % 4
jz L(goloop) C jmp if size == 1 (mod 4)
shr %edx
jnc L(odd) C jum if size == 3 (mod 4)
add %ecx, %ecx
lea 4(up), up
mov %ecx, (rp)
mov (up), %ecx
lea 4(rp), rp
dec %edx
jnz L(goloop) C jump if size == 0 (mod 4)
L(odd): lea -8(up), up
lea -8(rp), rp
jmp L(sentry) C reached if size == 2 or 3 (mod 4)
L(sloop):
adc %ecx, %ecx
mov 4(up), %edx
mov %ecx, (rp)
adc %edx, %edx
mov 8(up), %ecx
mov %edx, 4(rp)
L(sentry):
adc %ecx, %ecx
mov 12(up), %edx
mov %ecx, 8(rp)
adc %edx, %edx
lea 16(up), up
mov %edx, 12(rp)
lea 16(rp), rp
mov (up), %ecx
L(goloop):
decl %eax
jnz L(sloop)
L(squit):
adc %ecx, %ecx
mov %ecx, (rp)
adc %eax, %eax
mov SAVE_UP, up
pop rp FRAME_popl()
ret
EPILOGUE()
ASM_END()
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