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dnl AMD64 mpn_addlsh2_n -- rp[] = up[] + (vp[] << 2)
dnl AMD64 mpn_rsblsh2_n -- rp[] = (vp[] << 2) - up[]
dnl Optimised for Intel Atom.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 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 ?
C AMD K10 ?
C Intel P4 ?
C Intel core2 ?
C Intel NHM ?
C Intel SBR ?
C Intel atom 5.75
C VIA nano ?
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`vp', `%rdx')
define(`n', `%rcx')
define(`LSH', 2)
define(`RSH', 62)
define(M, eval(m4_lshift(1,LSH)))
ifdef(`OPERATION_addlsh2_n', `
define(ADDSUB, add)
define(ADCSBB, adc)
define(func_n, mpn_addlsh2_n)
define(func_nc, mpn_addlsh2_nc)')
ifdef(`OPERATION_rsblsh2_n', `
define(ADDSUB, sub)
define(ADCSBB, sbb)
define(func_n, mpn_rsblsh2_n)
define(func_nc, mpn_rsblsh2_nc)')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
MULFUNC_PROLOGUE(mpn_addlsh2_n mpn_rsblsh2_n)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func_n)
FUNC_ENTRY(4)
push %rbx
push %rbp
mov R32(n), R32(%rax)
and $3, R32(%rax)
jz L(b0) C we rely on rax = 0 at target
cmp $2, R32(%rax)
mov $0, R32(%rax)
jz L(b2)
jg L(b3)
L(b1): mov (vp), %r9
lea (%rax,%r9,M), %rbp
shr $RSH, %r9
sub $1, n
lea -8(up), up
lea -8(rp), rp
jz L(cj1)
mov 8(vp), %r10
lea (%r9,%r10,M), %r9
shr $RSH, %r10
mov 16(vp), %r11
lea 24(vp), vp
mov (vp), %r8
lea (%r10,%r11,M), %r10
shr $RSH, %r11
add R32(%rax), R32(%rax)
jmp L(L1)
L(b2): lea -32(rp), rp
mov (vp), %r8
lea -32(up), up
lea (%rax,%r8,M), %rbx
shr $RSH, %r8
mov 8(vp), %r9
sub $2, n
jle L(end)
jmp L(top)
L(b3): lea -24(up), up
mov (vp), %r11
lea -24(rp), rp
mov 8(vp), %r8
lea (%rax,%r11,M), %r10
shr $RSH, %r11
lea 8(vp), vp
lea (%r11,%r8,M), %rbx
add $1, n
jmp L(L3)
L(b0): lea -16(up), up
mov (vp), %r10
lea (%rax,%r10,M), %r9
shr $RSH, %r10
mov 8(vp), %r11
lea -16(rp), rp
mov 16(vp), %r8
lea (%r10,%r11,M), %r10
shr $RSH, %r11
add R32(%rax), R32(%rax)
lea 16(vp), vp
jmp L(L0)
ALIGN(16)
L(top): lea (%r8,%r9,M), %rbp
shr $RSH, %r9
lea 32(up), up
mov 16(vp), %r10
lea (%r9,%r10,M), %r9
shr $RSH, %r10
mov 24(vp), %r11
lea 32(rp), rp
lea 32(vp), vp
mov (vp), %r8
lea (%r10,%r11,M), %r10
shr $RSH, %r11
add R32(%rax), R32(%rax)
ADCSBB (up), %rbx
mov %rbx, (rp)
L(L1): ADCSBB 8(up), %rbp
mov %rbp, 8(rp)
L(L0): ADCSBB 16(up), %r9
lea (%r11,%r8,M), %rbx
mov %r9, 16(rp)
L(L3): ADCSBB 24(up), %r10
sbb R32(%rax), R32(%rax)
L(L2): shr $RSH, %r8
mov 8(vp), %r9
mov %r10, 24(rp)
sub $4, n
jg L(top)
L(end): lea (%r8,%r9,M), %rbp
shr $RSH, %r9
lea 32(up), up
lea 32(rp), rp
add R32(%rax), R32(%rax)
ADCSBB (up), %rbx
mov %rbx, (rp)
L(cj1): ADCSBB 8(up), %rbp
mov %rbp, 8(rp)
ifdef(`OPERATION_addlsh2_n',`
mov R32(n), R32(%rax) C zero rax
adc %r9, %rax')
ifdef(`OPERATION_rsblsh2_n',`
sbb n, %r9 C subtract 0
mov %r9, %rax')
pop %rbp
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
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