mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
250 lines
6.7 KiB
ArmAsm
250 lines
6.7 KiB
ArmAsm
/* Optimized version of the memccpy() function.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 2000-2021 Free Software Foundation, Inc.
|
|
Contributed by Dan Pop <Dan.Pop@cern.ch>.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* Return: a pointer to the next byte after char in dest or NULL
|
|
|
|
Inputs:
|
|
in0: dest
|
|
in1: src
|
|
in2: char
|
|
in3: byte count
|
|
|
|
This implementation assumes little endian mode (UM.be = 0).
|
|
|
|
This implementation assumes that it is safe to do read ahead
|
|
in the src block, without getting beyond its limit. */
|
|
|
|
#include <sysdep.h>
|
|
#undef ret
|
|
|
|
#define OP_T_THRES 16
|
|
#define OPSIZ 8
|
|
|
|
#define saved_pr r17
|
|
#define saved_lc r18
|
|
#define dest r19
|
|
#define src r20
|
|
#define len r21
|
|
#define asrc r22
|
|
#define tmp r23
|
|
#define char r24
|
|
#define charx8 r25
|
|
#define saved_ec r26
|
|
#define sh2 r28
|
|
#define sh1 r29
|
|
#define loopcnt r30
|
|
#define value r31
|
|
|
|
#ifdef GAS_ALIGN_BREAKS_UNWIND_INFO
|
|
/* Manually force proper loop-alignment. Note: be sure to
|
|
double-check the code-layout after making any changes to
|
|
this routine! */
|
|
# define ALIGN(n) { nop 0 }
|
|
#else
|
|
# define ALIGN(n) .align n
|
|
#endif
|
|
|
|
ENTRY(memccpy)
|
|
.prologue
|
|
alloc r2 = ar.pfs, 4, 40 - 4, 0, 40
|
|
|
|
#include "softpipe.h"
|
|
.rotr r[MEMLAT + 7], tmp1[4], tmp2[4], val[4], tmp3[2], pos0[2]
|
|
.rotp p[MEMLAT + 6 + 1]
|
|
|
|
mov ret0 = r0 // return NULL if no match
|
|
.save pr, saved_pr
|
|
mov saved_pr = pr // save the predicate registers
|
|
mov dest = in0 // dest
|
|
.save ar.lc, saved_lc
|
|
mov saved_lc = ar.lc // save the loop counter
|
|
mov saved_ec = ar.ec // save the loop counter
|
|
.body
|
|
mov src = in1 // src
|
|
extr.u char = in2, 0, 8 // char
|
|
mov len = in3 // len
|
|
sub tmp = r0, in0 // tmp = -dest
|
|
cmp.ne p7, p0 = r0, r0 // clear p7
|
|
;;
|
|
and loopcnt = 7, tmp // loopcnt = -dest % 8
|
|
cmp.ge p6, p0 = OP_T_THRES, len // is len <= OP_T_THRES
|
|
mov ar.ec = 0 // ec not guaranteed zero on entry
|
|
(p6) br.cond.spnt .cpyfew // copy byte by byte
|
|
;;
|
|
cmp.eq p6, p0 = loopcnt, r0
|
|
mux1 charx8 = char, @brcst
|
|
(p6) br.cond.sptk .dest_aligned
|
|
sub len = len, loopcnt // len -= -dest % 8
|
|
adds loopcnt = -1, loopcnt // --loopcnt
|
|
;;
|
|
mov ar.lc = loopcnt
|
|
.l1: // copy -dest % 8 bytes
|
|
ld1 value = [src], 1 // value = *src++
|
|
;;
|
|
st1 [dest] = value, 1 // *dest++ = value
|
|
cmp.eq p6, p0 = value, char
|
|
(p6) br.cond.spnt .foundit
|
|
br.cloop.dptk .l1
|
|
.dest_aligned:
|
|
and sh1 = 7, src // sh1 = src % 8
|
|
and tmp = -8, len // tmp = len & -OPSIZ
|
|
and asrc = -8, src // asrc = src & -OPSIZ -- align src
|
|
shr.u loopcnt = len, 3 // loopcnt = len / 8
|
|
and len = 7, len ;; // len = len % 8
|
|
shl sh1 = sh1, 3 // sh1 = 8 * (src % 8)
|
|
adds loopcnt = -1, loopcnt // --loopcnt
|
|
mov pr.rot = 1 << 16 ;; // set rotating predicates
|
|
sub sh2 = 64, sh1 // sh2 = 64 - sh1
|
|
mov ar.lc = loopcnt // set LC
|
|
cmp.eq p6, p0 = sh1, r0 // is the src aligned?
|
|
(p6) br.cond.sptk .src_aligned ;;
|
|
add src = src, tmp // src += len & -OPSIZ
|
|
mov ar.ec = MEMLAT + 6 + 1 // six more passes needed
|
|
ld8 r[1] = [asrc], 8 // r[1] = w0
|
|
cmp.ne p6, p0 = r0, r0 ;; // clear p6
|
|
ALIGN(32)
|
|
.l2:
|
|
(p[0]) ld8.s r[0] = [asrc], 8 // r[0] = w1
|
|
(p[MEMLAT]) shr.u tmp1[0] = r[1 + MEMLAT], sh1 // tmp1 = w0 >> sh1
|
|
(p[MEMLAT]) shl tmp2[0] = r[0 + MEMLAT], sh2 // tmp2 = w1 << sh2
|
|
(p[MEMLAT+4]) xor tmp3[0] = val[1], charx8
|
|
(p[MEMLAT+5]) czx1.r pos0[0] = tmp3[1]
|
|
(p[MEMLAT+6]) chk.s r[6 + MEMLAT], .recovery1 // our data isn't
|
|
// valid - rollback!
|
|
(p[MEMLAT+6]) cmp.ne p6, p0 = 8, pos0[1]
|
|
(p6) br.cond.spnt .gotit
|
|
(p[MEMLAT+6]) st8 [dest] = val[3], 8 // store val to dest
|
|
(p[MEMLAT+3]) or val[0] = tmp1[3], tmp2[3] // val = tmp1 | tmp2
|
|
br.ctop.sptk .l2
|
|
br.cond.sptk .cpyfew
|
|
|
|
.src_aligned:
|
|
cmp.ne p6, p0 = r0, r0 // clear p6
|
|
mov ar.ec = MEMLAT + 2 + 1 ;; // set EC
|
|
.l3:
|
|
(p[0]) ld8.s r[0] = [src], 8
|
|
(p[MEMLAT]) xor tmp3[0] = r[MEMLAT], charx8
|
|
(p[MEMLAT+1]) czx1.r pos0[0] = tmp3[1]
|
|
(p[MEMLAT+2]) cmp.ne p7, p0 = 8, pos0[1]
|
|
(p[MEMLAT+2]) chk.s r[MEMLAT+2], .recovery2
|
|
(p7) br.cond.spnt .gotit
|
|
.back2:
|
|
(p[MEMLAT+2]) st8 [dest] = r[MEMLAT+2], 8
|
|
br.ctop.dptk .l3
|
|
.cpyfew:
|
|
cmp.eq p6, p0 = len, r0 // is len == 0 ?
|
|
adds len = -1, len // --len;
|
|
(p6) br.cond.spnt .restore_and_exit ;;
|
|
mov ar.lc = len
|
|
.l4:
|
|
ld1 value = [src], 1
|
|
;;
|
|
st1 [dest] = value, 1
|
|
cmp.eq p6, p0 = value, char
|
|
(p6) br.cond.spnt .foundit
|
|
br.cloop.dptk .l4 ;;
|
|
.foundit:
|
|
(p6) mov ret0 = dest
|
|
.restore_and_exit:
|
|
mov pr = saved_pr, -1 // restore the predicate registers
|
|
mov ar.lc = saved_lc // restore the loop counter
|
|
mov ar.ec = saved_ec ;; // restore the epilog counter
|
|
br.ret.sptk.many b0
|
|
.gotit:
|
|
.pred.rel "mutex" p6, p7
|
|
(p6) mov value = val[3] // if coming from l2
|
|
(p7) mov value = r[MEMLAT+2] // if coming from l3
|
|
mov ar.lc = pos0[1] ;;
|
|
.l5:
|
|
extr.u tmp = value, 0, 8 ;;
|
|
st1 [dest] = tmp, 1
|
|
shr.u value = value, 8
|
|
br.cloop.sptk .l5 ;;
|
|
mov ret0 = dest
|
|
mov pr = saved_pr, -1
|
|
mov ar.lc = saved_lc
|
|
br.ret.sptk.many b0
|
|
|
|
.recovery1:
|
|
#if MEMLAT != 6
|
|
# error "MEMLAT must be 6!"
|
|
#endif
|
|
adds src = -8, asrc
|
|
mov loopcnt = ar.lc
|
|
mov tmp = ar.ec
|
|
;;
|
|
(p[0]) adds src = -8, src
|
|
;;
|
|
(p[1]) adds src = -8, src
|
|
sub sh1 = (MEMLAT + 6 + 1), tmp
|
|
;;
|
|
(p[2]) adds src = -8, src
|
|
;;
|
|
(p[3]) adds src = -8, src
|
|
shl loopcnt = loopcnt, 3
|
|
;;
|
|
(p[4]) adds src = -8, src
|
|
;;
|
|
(p[5]) adds src = -8, src
|
|
shl sh1 = sh1, 3
|
|
;;
|
|
(p[6]) adds src = -8, src
|
|
;;
|
|
(p[7]) adds src = -8, src
|
|
shl tmp = tmp, 3
|
|
;;
|
|
(p[8]) adds src = -8, src
|
|
;;
|
|
(p[9]) adds src = -8, src
|
|
shr.u sh2 = sh2, 3
|
|
;;
|
|
(p[10]) adds src = -8, src
|
|
;;
|
|
(p[11]) adds src = -8, src
|
|
add len = len, loopcnt
|
|
;;
|
|
sub src = src, sh2
|
|
;;
|
|
add len = tmp, len
|
|
add src = sh1, src
|
|
br.cond.sptk .cpyfew
|
|
|
|
.recovery2:
|
|
#if MEMLAT != 6
|
|
# error "MEMLAT must be 6!"
|
|
#endif
|
|
add tmp = -8, src
|
|
(p7) br.cond.spnt .gotit
|
|
;;
|
|
(p[0]) add tmp = -8, tmp ;;
|
|
(p[1]) add tmp = -8, tmp ;;
|
|
(p[2]) add tmp = -8, tmp ;;
|
|
(p[3]) add tmp = -8, tmp ;;
|
|
(p[4]) add tmp = -8, tmp ;;
|
|
(p[5]) add tmp = -8, tmp ;;
|
|
(p[6]) add tmp = -8, tmp ;;
|
|
(p[7]) add tmp = -8, tmp ;;
|
|
ld8 r[MEMLAT+2] = [tmp] ;;
|
|
xor pos0[1] = r[MEMLAT+2], charx8 ;;
|
|
czx1.r pos0[1] = pos0[1] ;;
|
|
cmp.ne p7, p6 = 8, pos0[1]
|
|
(p7) br.cond.spnt .gotit
|
|
br.cond.sptk .back2
|
|
END(memccpy)
|