mirror of
https://review.haiku-os.org/buildtools
synced 2025-02-14 17:57:39 +01:00
f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
122 lines
2.6 KiB
NASM
122 lines
2.6 KiB
NASM
dnl ARM mpn_mod_34lsub1 -- remainder modulo 2^24-1.
|
|
|
|
dnl Copyright 2012, 2013 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 Cortex-A7 ?
|
|
C Cortex-A8 ?
|
|
C Cortex-A9 1.33
|
|
C Cortex-A15 1.33
|
|
|
|
define(`ap', r0)
|
|
define(`n', r1)
|
|
|
|
C mp_limb_t mpn_mod_34lsub1 (mp_srcptr up, mp_size_t n)
|
|
|
|
C TODO
|
|
C * Write cleverer summation code.
|
|
C * Consider loading 6 64-bit aligned registers at a time, to approach 1 c/l.
|
|
|
|
ASM_START()
|
|
TEXT
|
|
ALIGN(32)
|
|
PROLOGUE(mpn_mod_34lsub1)
|
|
push { r4, r5, r6, r7 }
|
|
|
|
subs n, n, #3
|
|
mov r7, #0
|
|
blt L(le2) C n <= 2
|
|
|
|
ldmia ap!, { r2, r3, r12 }
|
|
subs n, n, #3
|
|
blt L(sum) C n <= 5
|
|
cmn r0, #0 C clear carry
|
|
sub n, n, #3
|
|
b L(mid)
|
|
|
|
L(top): adcs r2, r2, r4
|
|
adcs r3, r3, r5
|
|
adcs r12, r12, r6
|
|
L(mid): ldmia ap!, { r4, r5, r6 }
|
|
tst n, n
|
|
sub n, n, #3
|
|
bpl L(top)
|
|
|
|
add n, n, #3
|
|
|
|
adcs r2, r2, r4
|
|
adcs r3, r3, r5
|
|
adcs r12, r12, r6
|
|
movcs r7, #1 C r7 <= 1
|
|
|
|
L(sum): cmn n, #2
|
|
movlo r4, #0
|
|
ldrhs r4, [ap], #4
|
|
movls r5, #0
|
|
ldrhi r5, [ap], #4
|
|
|
|
adds r2, r2, r4
|
|
adcs r3, r3, r5
|
|
adcs r12, r12, #0
|
|
adc r7, r7, #0 C r7 <= 2
|
|
|
|
L(sum2):
|
|
bic r0, r2, #0xff000000
|
|
add r0, r0, r2, lsr #24
|
|
add r0, r0, r7
|
|
|
|
mov r7, r3, lsl #8
|
|
bic r1, r7, #0xff000000
|
|
add r0, r0, r1
|
|
add r0, r0, r3, lsr #16
|
|
|
|
mov r7, r12, lsl #16
|
|
bic r1, r7, #0xff000000
|
|
add r0, r0, r1
|
|
add r0, r0, r12, lsr #8
|
|
|
|
pop { r4, r5, r6, r7 }
|
|
ret lr
|
|
|
|
L(le2): cmn n, #1
|
|
bne L(1)
|
|
ldmia ap!, { r2, r3 }
|
|
mov r12, #0
|
|
b L(sum2)
|
|
L(1): ldr r2, [ap]
|
|
bic r0, r2, #0xff000000
|
|
add r0, r0, r2, lsr #24
|
|
pop { r4, r5, r6, r7 }
|
|
ret lr
|
|
EPILOGUE()
|