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dnl AMD64 mpn_addmul_2 -- Multiply an n-limb vector with a 2-limb vector and
dnl add the result to a third limb vector.
dnl Copyright 2008 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 K8,K9: 2.375
C K10: 2.375
C P4: ?
C P6-15: 4.45
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 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')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_addmul_2)
push %rbx
push %rbp
mov (vp), v0
mov 8(vp), v1
mov n_param, n
neg n
lea -32(up,n_param,8), up
lea -32(rp,n_param,8), rp
and $3, R32(n_param)
jz L(am2p0)
cmp $2, R32(n_param)
jc L(am2p1)
jz L(am2p2)
L(am2p3):
mov 32(up,n,8), %rax
mul v0
mov %rax, w1
mov 32(up,n,8), %rax
mov %rdx, w2
xor R32(w3), R32(w3)
add $2, n
jmp L(am3)
L(am2p0):
mov 32(up,n,8), %rax
mul v0
mov %rax, w0
mov 32(up,n,8), %rax
mov %rdx, w1
xor R32(w2), R32(w2)
add $3, n
jmp L(am0)
L(am2p1):
mov 32(up,n,8), %rax
mul v0
mov %rax, w3
mov 32(up,n,8), %rax
mov %rdx, w0
xor R32(w1), R32(w1)
jmp L(am1)
L(am2p2):
mov 32(up,n,8), %rax
mul v0
mov %rax, w2
mov 32(up,n,8), %rax
mov %rdx, w3
xor R32(w0), R32(w0)
xor R32(w1), R32(w1)
add $1, n
jmp L(am2)
ALIGN(32)
L(top):
add w3, (rp,n,8)
adc %rax, w0
mov 8(up,n,8), %rax
adc %rdx, w1
mov $0, R32(w2)
mul v0
add %rax, w0
mov 8(up,n,8), %rax
adc %rdx, w1
adc $0, R32(w2)
L(am0): mul v1
add w0, 8(rp,n,8)
adc %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)
L(am3): mul v1
add w1, 16(rp,n,8)
adc %rax, w2
mov 24(up,n,8), %rax
adc %rdx, w3
mul v0
mov $0, R32(w0)
add %rax, w2
adc %rdx, w3
mov $0, R32(w1)
mov 24(up,n,8), %rax
adc $0, R32(w0)
L(am2): mul v1
add w2, 24(rp,n,8)
adc %rax, w3
adc %rdx, w0
mov 32(up,n,8), %rax
mul v0
add %rax, w3
mov 32(up,n,8), %rax
adc %rdx, w0
adc $0, R32(w1)
L(am1): mul v1
add $4, n
js L(top)
add w3, (rp,n,8)
adc %rax, w0
adc %rdx, w1
mov w0, 8(rp,n,8)
mov w1, %rax
pop %rbp
pop %rbx
ret
EPILOGUE()
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