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dnl AMD64 mpn_sublsh1_n optimised for Intel Atom.
dnl Used also for AMD bd1.
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 TODO
C * This code is slightly large at 501 bytes.
C * aorrlsh1_n.asm and this file use the same basic pattern.
C cycles/limb
C AMD K8,K9 ?
C AMD K10 ?
C AMD bd1 2.3
C AMD bobcat ?
C Intel P4 ?
C Intel core2 ?
C Intel NHM ?
C Intel SBR ?
C Intel atom 5 (4.875 is probably possible)
C VIA nano ?
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`vp', `%rdx')
define(`n', `%rcx')
define(`cy', `%r8')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_sublsh1_n)
FUNC_ENTRY(4)
push %rbp
push %r15
xor R32(%rbp), R32(%rbp)
L(ent): mov R32(n), R32(%rax)
and $3, R32(%rax)
jz L(b0)
cmp $2, R32(%rax)
jz L(b2)
jg L(b3)
L(b1): mov (vp), %r8
add %r8, %r8
lea 8(vp), vp
sbb R32(%rax), R32(%rax) C save scy
add R32(%rbp), R32(%rbp) C restore acy
mov (up), %r15
sbb %r8, %r15
mov %r15, (rp)
sbb R32(%rbp), R32(%rbp) C save acy
lea 8(up), up
lea 8(rp), rp
jmp L(b0)
L(b2): mov (vp), %r8
add %r8, %r8
mov 8(vp), %r9
adc %r9, %r9
lea 16(vp), vp
sbb R32(%rax), R32(%rax) C save scy
add R32(%rbp), R32(%rbp) C restore acy
mov (up), %r15
sbb %r8, %r15
mov %r15, (rp)
mov 8(up), %r15
sbb %r9, %r15
mov %r15, 8(rp)
sbb R32(%rbp), R32(%rbp) C save acy
lea 16(up), up
lea 16(rp), rp
jmp L(b0)
L(b3): mov (vp), %r8
add %r8, %r8
mov 8(vp), %r9
adc %r9, %r9
mov 16(vp), %r10
adc %r10, %r10
lea 24(vp), vp
sbb R32(%rax), R32(%rax) C save scy
add R32(%rbp), R32(%rbp) C restore acy
mov (up), %r15
sbb %r8, %r15
mov %r15, (rp)
mov 8(up), %r15
sbb %r9, %r15
mov %r15, 8(rp)
mov 16(up), %r15
sbb %r10, %r15
mov %r15, 16(rp)
sbb R32(%rbp), R32(%rbp) C save acy
lea 24(up), up
lea 24(rp), rp
L(b0): test $4, R8(n)
jz L(skp)
add R32(%rax), R32(%rax) C restore scy
mov (vp), %r8
adc %r8, %r8
mov 8(vp), %r9
adc %r9, %r9
mov 16(vp), %r10
adc %r10, %r10
mov 24(vp), %r11
adc %r11, %r11
lea 32(vp), vp
sbb R32(%rax), R32(%rax) C save scy
add R32(%rbp), R32(%rbp) C restore acy
mov (up), %r15
sbb %r8, %r15
mov %r15, (rp)
mov 8(up), %r15
sbb %r9, %r15
mov %r15, 8(rp)
mov 16(up), %r15
sbb %r10, %r15
mov %r15, 16(rp)
mov 24(up), %r15
sbb %r11, %r15
mov %r15, 24(rp)
lea 32(up), up
lea 32(rp), rp
sbb R32(%rbp), R32(%rbp) C save acy
L(skp): cmp $8, n
jl L(rtn)
push %r12
push %r13
push %r14
push %rbx
lea -64(rp), rp
jmp L(x)
ALIGN(16)
L(top): mov (vp), %r8
add R32(%rax), R32(%rax)
lea 64(vp), vp
adc %r8, %r8
mov -56(vp), %r9
adc %r9, %r9
mov -48(vp), %r10
adc %r10, %r10
mov -40(vp), %r11
adc %r11, %r11
mov -32(vp), %r12
adc %r12, %r12
mov -24(vp), %r13
adc %r13, %r13
mov -16(vp), %r14
adc %r14, %r14
mov -8(vp), %r15
adc %r15, %r15
sbb R32(%rax), R32(%rax)
add R32(%rbp), R32(%rbp)
mov (up), %rbp
lea 64(rp), rp
mov 8(up), %rbx
sbb %r8, %rbp
mov 32(up), %r8
mov %rbp, (rp)
sbb %r9, %rbx
mov 16(up), %rbp
mov %rbx, 8(rp)
sbb %r10, %rbp
mov 24(up), %rbx
mov %rbp, 16(rp)
sbb %r11, %rbx
mov %rbx, 24(rp)
sbb %r12, %r8
mov 40(up), %r9
mov %r8, 32(rp)
sbb %r13, %r9
mov 48(up), %rbp
mov %r9, 40(rp)
sbb %r14, %rbp
mov 56(up), %rbx
mov %rbp, 48(rp)
sbb %r15, %rbx
lea 64(up), up
mov %rbx, 56(rp)
sbb R32(%rbp), R32(%rbp)
L(x): sub $8, n
jge L(top)
L(end): pop %rbx
pop %r14
pop %r13
pop %r12
L(rtn):
add R32(%rbp), R32(%rax)
neg R32(%rax)
pop %r15
pop %rbp
FUNC_EXIT()
ret
EPILOGUE()
PROLOGUE(mpn_sublsh1_nc)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
push %rbp
push %r15
neg %r8 C set CF
sbb R32(%rbp), R32(%rbp) C save acy
jmp L(ent)
EPILOGUE()
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