dnl AMD64 mpn_mul_1.
dnl Copyright 2003-2005, 2007, 2008, 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 2.5
C AMD K10 2.5
C AMD bd1 5.0
C AMD bobcat 5.5
C Intel P4 12.3
C Intel core2 4.0
C Intel NHM 3.75
C Intel SBR 2.95
C Intel atom 19.8
C VIA nano 4.25
C The loop of this code is the result of running a code generation and
C optimization tool suite written by David Harvey and Torbjorn Granlund.
C TODO
C * The loop is great, but the prologue and epilogue code was quickly written.
C Tune it!
define(`rp', `%rdi') C rcx
define(`up', `%rsi') C rdx
define(`n_param', `%rdx') C r8
define(`vl', `%rcx') C r9
define(`n', `%r11')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
IFDOS(` define(`up', ``%rsi'') ') dnl
IFDOS(` define(`rp', ``%rcx'') ') dnl
IFDOS(` define(`vl', ``%r9'') ') dnl
IFDOS(` define(`r9', ``rdi'') ') dnl
IFDOS(` define(`n', ``%r8'') ') dnl
IFDOS(` define(`r8', ``r11'') ') dnl
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_mul_1c)
IFDOS(``push %rsi '')
IFDOS(``push %rdi '')
IFDOS(``mov %rdx, %rsi '')
push %rbx
IFSTD(` mov %r8, %r10')
IFDOS(` mov 64(%rsp), %r10') C 40 + 3*8 (3 push insns)
jmp L(common)
EPILOGUE()
PROLOGUE(mpn_mul_1)
IFDOS(``push %rsi '')
IFDOS(``push %rdi '')
IFDOS(``mov %rdx, %rsi '')
push %rbx
xor %r10, %r10
L(common):
mov (up), %rax C read first u limb early
IFSTD(` mov n_param, %rbx ') C move away n from rdx, mul uses it
IFDOS(` mov n, %rbx ')
mul vl
IFSTD(` mov %rbx, n ')
add %r10, %rax
adc $0, %rdx
and $3, R32(%rbx)
jz L(b0)
cmp $2, R32(%rbx)
jz L(b2)
jg L(b3)
L(b1): dec n
jne L(gt1)
mov %rax, (rp)
jmp L(ret)
L(gt1): lea 8(up,n,8), up
lea -8(rp,n,8), rp
neg n
xor %r10, %r10
xor R32(%rbx), R32(%rbx)
mov %rax, %r9
mov (up,n,8), %rax
mov %rdx, %r8
jmp L(L1)
L(b0): lea (up,n,8), up
lea -16(rp,n,8), rp
neg n
xor %r10, %r10
mov %rax, %r8
mov %rdx, %rbx
jmp L(L0)
L(b3): lea -8(up,n,8), up
lea -24(rp,n,8), rp
neg n
mov %rax, %rbx
mov %rdx, %r10
jmp L(L3)
L(b2): lea -16(up,n,8), up
lea -32(rp,n,8), rp
neg n
xor %r8, %r8
xor R32(%rbx), R32(%rbx)
mov %rax, %r10
mov 24(up,n,8), %rax
mov %rdx, %r9
jmp L(L2)
ALIGN(16)
L(top): mov %r10, (rp,n,8)
add %rax, %r9
mov (up,n,8), %rax
adc %rdx, %r8
mov $0, R32(%r10)
L(L1): mul vl
mov %r9, 8(rp,n,8)
add %rax, %r8
adc %rdx, %rbx
L(L0): mov 8(up,n,8), %rax
mul vl
mov %r8, 16(rp,n,8)
add %rax, %rbx
adc %rdx, %r10
L(L3): mov 16(up,n,8), %rax
mul vl
mov %rbx, 24(rp,n,8)
mov $0, R32(%r8) C zero
mov %r8, %rbx C zero
add %rax, %r10
mov 24(up,n,8), %rax
mov %r8, %r9 C zero
adc %rdx, %r9
L(L2): mul vl
add $4, n
js L(top)
mov %r10, (rp,n,8)
add %rax, %r9
adc %r8, %rdx
mov %r9, 8(rp,n,8)
add %r8, %rdx
L(ret): mov %rdx, %rax
pop %rbx
IFDOS(``pop %rdi '')
IFDOS(``pop %rsi '')
ret
EPILOGUE()