dnl X86-64 mpn_mul_1 optimised for Intel Sandy Bridge.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2003-2005, 2007, 2008, 2011-2013 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 AMD bd1
C AMD bobcat
C Intel P4
C Intel core2
C Intel NHM
C Intel SBR 2.5
C Intel IBR 2.4
C Intel atom
C VIA nano
C The loop of this code is the result of running a code generation and
C optimisation tool suite written by David Harvey and Torbjorn Granlund.
C TODO
C * The loop is great, but the prologue code was quickly written. Tune it!
C * Add mul_1c entry point.
C * We could preserve one less register under DOS64 calling conventions, using
C r10 instead of rsi.
define(`rp', `%rdi') C rcx
define(`up', `%rsi') C rdx
define(`n_param', `%rdx') C r8
define(`v0', `%rcx') C r9
define(`n', `%r11')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
IFDOS(` define(`up', ``%rsi'')') dnl
IFDOS(` define(`rp', ``%rcx'')') dnl
IFDOS(` define(`v0', ``%r9'')') dnl
IFDOS(` define(`r9', ``rdi'')') dnl
IFDOS(` define(`n_param',``%r8'')') dnl
IFDOS(` define(`n', ``%r8'')') dnl
IFDOS(` define(`r8', ``r11'')') dnl
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_mul_1)
IFDOS(``push %rsi '')
IFDOS(``push %rdi '')
IFDOS(``mov %rdx, %rsi '')
mov (up), %rax
mov R32(`n_param'), R32(%r10)
IFSTD(` mov n_param, n ')
lea (up,n_param,8), up
lea -8(rp,n_param,8), rp
neg n
mul v0
and $3, R32(%r10)
jz L(b0)
cmp $2, R32(%r10)
jb L(b1)
jz L(b2)
L(b3): add $-1, n
mov %rax, %r9
mov %rdx, %r8
mov 16(up,n,8), %rax
jmp L(L3)
L(b1): mov %rax, %r9
mov %rdx, %r8
add $1, n
jnc L(L1)
mov %rax, (rp)
mov %rdx, %rax
IFDOS(``pop %rdi '')
IFDOS(``pop %rsi '')
ret
L(b2): add $-2, n
mov %rax, %r8
mov %rdx, %r9
mov 24(up,n,8), %rax
jmp L(L2)
L(b0): mov %rax, %r8
mov %rdx, %r9
mov 8(up,n,8), %rax
jmp L(L0)
ALIGN(8)
L(top): mov %rdx, %r8
add %rax, %r9
L(L1): mov 0(up,n,8), %rax
adc $0, %r8
mul v0
add %rax, %r8
mov %r9, 0(rp,n,8)
mov 8(up,n,8), %rax
mov %rdx, %r9
adc $0, %r9
L(L0): mul v0
mov %r8, 8(rp,n,8)
add %rax, %r9
mov %rdx, %r8
mov 16(up,n,8), %rax
adc $0, %r8
L(L3): mul v0
mov %r9, 16(rp,n,8)
mov %rdx, %r9
add %rax, %r8
mov 24(up,n,8), %rax
adc $0, %r9
L(L2): mul v0
mov %r8, 24(rp,n,8)
add $4, n
jnc L(top)
L(end): add %rax, %r9
mov %rdx, %rax
adc $0, %rax
mov %r9, (rp)
IFDOS(``pop %rdi '')
IFDOS(``pop %rsi '')
ret
EPILOGUE()