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dnl ARM Neon mpn_sec_tabselect.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2011-2013 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 1.15
C Cortex-A15 0.65
define(`rp', `r0')
define(`tp', `r1')
define(`n', `r2')
define(`nents', `r3')
C define(`which', on stack)
define(`i', `r4')
define(`j', `r5')
define(`maskq', `q10')
define(`maskd', `d20')
ASM_START()
PROLOGUE(mpn_sec_tabselect)
push {r4-r5}
add r4, sp, #8
vld1.32 {d30[], d31[]}, [r4] C 4 `which' copies
vmov.i32 q14, #1 C 4 copies of 1
subs j, n, #8
bmi L(outer_end)
L(outer_top):
mov i, nents
mov r12, tp C preserve tp
veor q13, q13, q13 C 4 counter copies
veor q2, q2, q2
veor q3, q3, q3
ALIGN(16)
L(top): vceq.i32 maskq, q13, q15 C compare idx copies to `which' copies
vld1.32 {q0,q1}, [tp]
vadd.i32 q13, q13, q14
vbit q2, q0, maskq
vbit q3, q1, maskq
add tp, tp, n, lsl #2
subs i, i, #1
bne L(top)
vst1.32 {q2,q3}, [rp]!
add tp, r12, #32 C restore tp, point to next slice
subs j, j, #8
bpl L(outer_top)
L(outer_end):
tst n, #4
beq L(b0xx)
L(b1xx):mov i, nents
mov r12, tp
veor q13, q13, q13
veor q2, q2, q2
ALIGN(16)
L(tp4): vceq.i32 maskq, q13, q15
vld1.32 {q0}, [tp]
vadd.i32 q13, q13, q14
vbit q2, q0, maskq
add tp, tp, n, lsl #2
subs i, i, #1
bne L(tp4)
vst1.32 {q2}, [rp]!
add tp, r12, #16
L(b0xx):tst n, #2
beq L(b00x)
L(b01x):mov i, nents
mov r12, tp
veor d26, d26, d26
veor d4, d4, d4
ALIGN(16)
L(tp2): vceq.i32 maskd, d26, d30
vld1.32 {d0}, [tp]
vadd.i32 d26, d26, d28
vbit d4, d0, maskd
add tp, tp, n, lsl #2
subs i, i, #1
bne L(tp2)
vst1.32 {d4}, [rp]!
add tp, r12, #8
L(b00x):tst n, #1
beq L(b000)
L(b001):mov i, nents
mov r12, tp
veor d26, d26, d26
veor d4, d4, d4
ALIGN(16)
L(tp1): vceq.i32 maskd, d26, d30
vld1.32 {d0[0]}, [tp]
vadd.i32 d26, d26, d28
vbit d4, d0, maskd
add tp, tp, n, lsl #2
subs i, i, #1
bne L(tp1)
vst1.32 {d4[0]}, [rp]
L(b000):pop {r4-r5}
bx r14
EPILOGUE()
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