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dnl Intel Atom mpn_rshift -- mpn right shift.
dnl Copyright 2011 Free Software Foundation, Inc.
dnl Converted from AMD64 by 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 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 mp_limb_t mpn_rshift (mp_ptr dst, mp_srcptr src, mp_size_t size,
C unsigned cnt);
C cycles/limb
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
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_rshift)
mov PARAM_CNT, cnt
mov PARAM_SIZE, %edx
mov up, SAVE_UP
mov PARAM_SRC, up
push rp FRAME_pushl()
mov PARAM_DST, rp
mov %ebx, SAVE_EBX
shr %edx
mov (up), %eax
mov %edx, VAR_COUNT
jnc L(evn)
mov %eax, %ebx
shr %cl, %ebx
neg cnt
shl %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
shl %cl, %eax
jmp L(lo1)
L(evn): mov %ebp, SAVE_EBP
neg cnt
mov %eax, %ebp
mov 4(up), %edx
shl %cl, %eax
mov %edx, %ebx
shl %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): shr %cl, %ebp
or %ebp, %edx
shr %cl, %ebx
neg cnt
mov 4(up), %eax
mov %eax, %ebp
mov %edx, 4(rp)
shl %cl, %eax
lea 8(rp), rp
L(lo1): mov 8(up), %edx
or %ebx, %eax
mov %edx, %ebx
shl %cl, %edx
lea 8(up), up
neg cnt
mov %eax, (rp)
decl VAR_COUNT
jg L(top)
pop %eax FRAME_popl()
L(end):
shr %cl, %ebp
shr %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
EPILOGUE()
ASM_END()
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