dnl AMD64 mpn_addmul_1 and mpn_submul_1 optimised for AMD Bulldozer.
dnl Copyright 2003-2005, 2007, 2008, 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 AMD bd1 4.5-4.7
C AMD bobcat
C Intel P4
C Intel core2
C Intel NHM
C Intel SBR
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 * Try to make loop run closer to 4 c/l.
define(`rp', `%rdi') C rcx
define(`up', `%rsi') C rdx
define(`n_param', `%rdx') C r8
define(`v0', `%rcx') C r9
define(`n', `%r11')
ifdef(`OPERATION_addmul_1',`
define(`ADDSUB', `add')
define(`func', `mpn_addmul_1')
')
ifdef(`OPERATION_submul_1',`
define(`ADDSUB', `sub')
define(`func', `mpn_submul_1')
')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1)
IFDOS(` define(`up', ``%rsi'') ') dnl
IFDOS(` define(`rp', ``%rcx'') ') dnl
IFDOS(` define(`v0', ``%r9'') ') dnl
IFDOS(` define(`r9', ``rdi'') ') dnl
IFDOS(` define(`n', ``%r8'') ') dnl
IFDOS(` define(`r8', ``r11'') ') dnl
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func)
IFDOS(``push %rsi '')
IFDOS(``push %rdi '')
IFDOS(``mov %rdx, %rsi '')
mov (up), %rax C read first u limb early
push %rbx
IFSTD(` mov n_param, %rbx ') C move away n from rdx, mul uses it
IFDOS(` mov n, %rbx ')
mul v0
IFSTD(` mov %rbx, n ')
and $3, R32(%rbx)
lea -16(rp,n,8), rp
jz L(b0)
cmp $2, R32(%rbx)
jb L(b1)
jz L(b2)
L(b3): mov $0, R32(%r8)
mov %rax, %rbx
mov $0, R32(%r9)
mov 8(up), %rax
mov %rdx, %r10
lea (up,n,8), up
not n
jmp L(L3)
L(b0): mov $0, R32(%r10)
mov %rax, %r8
mov %rdx, %rbx
mov 8(up), %rax
lea (up,n,8), up
neg n
jmp L(L0)
L(b1): cmp $1, n
jz L(n1)
mov %rax, %r9
mov 8(up), %rax
mov %rdx, %r8
mov $0, R32(%rbx)
lea (up,n,8), up
neg n
inc n
jmp L(L1)
L(b2): mov $0, R32(%rbx)
mov %rax, %r10
mov %rdx, %r9
mov 8(up), %rax
mov $0, R32(%r8)
lea (up,n,8), up
neg n
add $2, n
jns L(end)
ALIGN(32)
L(top): mul v0
ADDSUB %r10, (rp,n,8)
adc %rax, %r9
mov (up,n,8), %rax
adc %rdx, %r8
L(L1): mul v0
mov $0, R32(%r10)
ADDSUB %r9, 8(rp,n,8)
adc %rax, %r8
adc %rdx, %rbx
mov 8(up,n,8), %rax
L(L0): mul v0
ADDSUB %r8, 16(rp,n,8)
mov $0, R32(%r8)
adc %rax, %rbx
mov $0, R32(%r9)
mov 16(up,n,8), %rax
adc %rdx, %r10
L(L3): mul v0
ADDSUB %rbx, 24(rp,n,8)
mov $0, R32(%rbx)
adc %rax, %r10
adc %rdx, %r9
mov 24(up,n,8), %rax
add $4, n
js L(top)
L(end): mul v0
ADDSUB %r10, (rp)
adc %r9, %rax
adc %r8, %rdx
L(n1): ADDSUB %rax, 8(rp)
adc $0, %rdx
mov %rdx, %rax
pop %rbx
IFDOS(``pop %rdi '')
IFDOS(``pop %rsi '')
ret
EPILOGUE()
ASM_END()