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dnl ARM mpn_mul_2.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 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 StrongARM: -
C XScale -
C ARM11 5.25
C Cortex-A5 3.63
C Cortex-A7 3.15
C Cortex-A8 5.0
C Cortex-A9 2.25
C Cortex-A15 2.5
C Cortex-A17 2.13
C Cortex-A53 3.5
C TODO
C * This is a trivial edit of the addmul_2 code. Check for simplifications,
C and possible speedups to 2.0 c/l.
define(`rp',`r0')
define(`up',`r1')
define(`n', `r2')
define(`vp',`r3')
define(`v0',`r6')
define(`v1',`r7')
define(`u0',`r3')
define(`u1',`r9')
define(`cya',`r8')
define(`cyb',`r12')
ASM_START()
PROLOGUE(mpn_mul_2)
push { r4, r5, r6, r7, r8, r9 }
ldm vp, { v0, v1 }
mov cya, #0
mov cyb, #0
tst n, #1
beq L(evn)
L(odd): mov r5, #0
ldr u0, [up, #0]
mov r4, #0
tst n, #2
beq L(fi1)
L(fi3): sub up, up, #12
sub rp, rp, #16
b L(lo3)
L(fi1): sub n, n, #1
sub up, up, #4
sub rp, rp, #8
b L(lo1)
L(evn): mov r4, #0
ldr u1, [up, #0]
mov r5, #0
tst n, #2
bne L(fi2)
L(fi0): sub up, up, #8
sub rp, rp, #12
b L(lo0)
L(fi2): subs n, n, #2
sub rp, rp, #4
bls L(end)
ALIGN(16)
L(top): ldr u0, [up, #4]
umaal r4, cya, u1, v0
str r4, [rp, #4]
mov r4, #0
umaal r5, cyb, u1, v1
L(lo1): ldr u1, [up, #8]
umaal r5, cya, u0, v0
str r5, [rp, #8]
mov r5, #0
umaal r4, cyb, u0, v1
L(lo0): ldr u0, [up, #12]
umaal r4, cya, u1, v0
str r4, [rp, #12]
mov r4, #0
umaal r5, cyb, u1, v1
L(lo3): ldr u1, [up, #16]!
umaal r5, cya, u0, v0
str r5, [rp, #16]!
mov r5, #0
umaal r4, cyb, u0, v1
subs n, n, #4
bhi L(top)
L(end): umaal r4, cya, u1, v0
ldr u0, [up, #4]
umaal r5, cyb, u1, v1
str r4, [rp, #4]
umaal r5, cya, u0, v0
umaal cya, cyb, u0, v1
str r5, [rp, #8]
str cya, [rp, #12]
mov r0, cyb
pop { r4, r5, r6, r7, r8, r9 }
bx r14
EPILOGUE()
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