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dnl AMD64 mpn_mul_2 -- Multiply an n-limb vector with a 2-limb vector and
dnl store the result in a third limb vector.
dnl Copyright 2008, 2011 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 2.275
C AMD K10 2.275
C Intel P4 13.5
C Intel core2 4.0
C Intel corei 3.8
C Intel atom ?
C VIA nano ?
C This code is the result of running a code generation and optimization tool
C suite written by David Harvey and Torbjorn Granlund.
C TODO
C * Work on feed-in and wind-down code.
C * Convert "mov $0" to "xor".
C * Adjust initial lea to save some bytes.
C * Perhaps adjust n from n_param&3 value?
C * Replace with 2.25 c/l sequence.
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`n_param',`%rdx')
define(`vp', `%rcx')
define(`v0', `%r8')
define(`v1', `%r9')
define(`w0', `%rbx')
define(`w1', `%rcx')
define(`w2', `%rbp')
define(`w3', `%r10')
define(`n', `%r11')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(ELF64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_mul_2)
DOS64_ENTRY(4)
push %rbx
push %rbp
mov (vp), v0
mov 8(vp), v1
mov (up), %rax
mov n_param, n
neg n
lea -8(up,n_param,8), up
lea -8(rp,n_param,8), rp
and $3, R32(n_param)
jz L(m2p0)
cmp $2, R32(n_param)
jc L(m2p1)
jz L(m2p2)
L(m2p3):
mul v0
xor R32(w3), R32(w3)
mov %rax, w1
mov %rdx, w2
mov 8(up,n,8), %rax
add $-1, n
mul v1
add %rax, w2
jmp L(m23)
L(m2p0):
mul v0
xor R32(w2), R32(w2)
mov %rax, w0
mov %rdx, w1
jmp L(m20)
L(m2p1):
mul v0
xor R32(w3), R32(w3)
xor R32(w0), R32(w0)
xor R32(w1), R32(w1)
add $1, n
jmp L(m2top)
L(m2p2):
mul v0
xor R32(w0), R32(w0)
xor R32(w1), R32(w1)
mov %rax, w2
mov %rdx, w3
mov 8(up,n,8), %rax
add $-2, n
jmp L(m22)
ALIGN(32)
L(m2top):
add %rax, w3
adc %rdx, w0
mov 0(up,n,8), %rax
adc $0, R32(w1)
mov $0, R32(w2)
mul v1
add %rax, w0
mov w3, 0(rp,n,8)
adc %rdx, w1
mov 8(up,n,8), %rax
mul v0
add %rax, w0
adc %rdx, w1
adc $0, R32(w2)
L(m20): mov 8(up,n,8), %rax
mul v1
add %rax, w1
adc %rdx, w2
mov 16(up,n,8), %rax
mov $0, R32(w3)
mul v0
add %rax, w1
mov 16(up,n,8), %rax
adc %rdx, w2
adc $0, R32(w3)
mul v1
add %rax, w2
mov w0, 8(rp,n,8)
L(m23): adc %rdx, w3
mov 24(up,n,8), %rax
mul v0
mov $0, R32(w0)
add %rax, w2
adc %rdx, w3
mov w1, 16(rp,n,8)
mov 24(up,n,8), %rax
mov $0, R32(w1)
adc $0, R32(w0)
L(m22): mul v1
add %rax, w3
mov w2, 24(rp,n,8)
adc %rdx, w0
mov 32(up,n,8), %rax
mul v0
add $4, n
js L(m2top)
add %rax, w3
adc %rdx, w0
adc $0, R32(w1)
mov (up), %rax
mul v1
mov w3, (rp)
add %rax, w0
adc %rdx, w1
mov w0, 8(rp)
mov w1, %rax
pop %rbp
pop %rbx
DOS64_EXIT()
ret
EPILOGUE()
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