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dnl AMD64 mpn_rsh1add_n -- rp[] = (up[] + vp[]) >> 1
dnl AMD64 mpn_rsh1sub_n -- rp[] = (up[] - vp[]) >> 1
dnl Copyright 2003, 2005, 2009, 2011, 2012 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 cycles/limb
C AMD K8,K9 2.14 (mpn_add_n + mpn_rshift need 4.125)
C AMD K10 2.14 (mpn_add_n + mpn_rshift need 4.125)
C Intel P4 12.75
C Intel core2 3.75
C Intel NMH 4.4
C Intel SBR ?
C Intel atom ?
C VIA nano 3.25
C TODO
C * Rewrite to use indexed addressing, like addlsh1.asm and sublsh1.asm.
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`vp', `%rdx')
define(`n',` %rcx')
ifdef(`OPERATION_rsh1add_n', `
define(ADDSUB, add)
define(ADCSBB, adc)
define(func_n, mpn_rsh1add_n)
define(func_nc, mpn_rsh1add_nc)')
ifdef(`OPERATION_rsh1sub_n', `
define(ADDSUB, sub)
define(ADCSBB, sbb)
define(func_n, mpn_rsh1sub_n)
define(func_nc, mpn_rsh1sub_nc)')
MULFUNC_PROLOGUE(mpn_rsh1add_n mpn_rsh1add_nc mpn_rsh1sub_n mpn_rsh1sub_nc)
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func_nc)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
push %rbx
xor R32(%rax), R32(%rax)
neg %r8 C set C flag from parameter
mov (up), %rbx
ADCSBB (vp), %rbx
jmp L(ent)
EPILOGUE()
ALIGN(16)
PROLOGUE(func_n)
FUNC_ENTRY(4)
push %rbx
xor R32(%rax), R32(%rax)
mov (up), %rbx
ADDSUB (vp), %rbx
L(ent):
rcr %rbx C rotate, save acy
adc R32(%rax), R32(%rax) C return value
mov R32(n), R32(%r11)
and $3, R32(%r11)
cmp $1, R32(%r11)
je L(do) C jump if n = 1 5 9 ...
L(n1): cmp $2, R32(%r11)
jne L(n2) C jump unless n = 2 6 10 ...
add %rbx, %rbx C rotate carry limb, restore acy
mov 8(up), %r10
ADCSBB 8(vp), %r10
lea 8(up), up
lea 8(vp), vp
lea 8(rp), rp
rcr %r10
rcr %rbx
mov %rbx, -8(rp)
jmp L(cj1)
L(n2): cmp $3, R32(%r11)
jne L(n3) C jump unless n = 3 7 11 ...
add %rbx, %rbx C rotate carry limb, restore acy
mov 8(up), %r9
mov 16(up), %r10
ADCSBB 8(vp), %r9
ADCSBB 16(vp), %r10
lea 16(up), up
lea 16(vp), vp
lea 16(rp), rp
rcr %r10
rcr %r9
rcr %rbx
mov %rbx, -16(rp)
jmp L(cj2)
L(n3): dec n C come here for n = 4 8 12 ...
add %rbx, %rbx C rotate carry limb, restore acy
mov 8(up), %r8
mov 16(up), %r9
ADCSBB 8(vp), %r8
ADCSBB 16(vp), %r9
mov 24(up), %r10
ADCSBB 24(vp), %r10
lea 24(up), up
lea 24(vp), vp
lea 24(rp), rp
rcr %r10
rcr %r9
rcr %r8
rcr %rbx
mov %rbx, -24(rp)
mov %r8, -16(rp)
L(cj2): mov %r9, -8(rp)
L(cj1): mov %r10, %rbx
L(do):
shr $2, n C 4
je L(end) C 2
ALIGN(16)
L(top): add %rbx, %rbx C rotate carry limb, restore acy
mov 8(up), %r8
mov 16(up), %r9
ADCSBB 8(vp), %r8
ADCSBB 16(vp), %r9
mov 24(up), %r10
mov 32(up), %r11
ADCSBB 24(vp), %r10
ADCSBB 32(vp), %r11
lea 32(up), up
lea 32(vp), vp
rcr %r11 C rotate, save acy
rcr %r10
rcr %r9
rcr %r8
rcr %rbx
mov %rbx, (rp)
mov %r8, 8(rp)
mov %r9, 16(rp)
mov %r10, 24(rp)
mov %r11, %rbx
lea 32(rp), rp
dec n
jne L(top)
L(end): mov %rbx, (rp)
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
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