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dnl AMD64 mpn_mul_1.
dnl Copyright 2003, 2004, 2005, 2007, 2008, 2012 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://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()
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