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We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
249 lines
6.6 KiB
ArmAsm
249 lines
6.6 KiB
ArmAsm
/* Optimized version of the memccpy() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000-2021 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Return: a pointer to the next byte after char in dest or NULL
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Inputs:
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in0: dest
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in1: src
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in2: char
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in3: byte count
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This implementation assumes little endian mode (UM.be = 0).
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This implementation assumes that it is safe to do read ahead
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in the src block, without getting beyond its limit. */
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#include <sysdep.h>
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#undef ret
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#define OP_T_THRES 16
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#define OPSIZ 8
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#define saved_pr r17
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#define saved_lc r18
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#define dest r19
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#define src r20
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#define len r21
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#define asrc r22
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#define tmp r23
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#define char r24
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#define charx8 r25
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#define saved_ec r26
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#define sh2 r28
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#define sh1 r29
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#define loopcnt r30
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#define value r31
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#ifdef GAS_ALIGN_BREAKS_UNWIND_INFO
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/* Manually force proper loop-alignment. Note: be sure to
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double-check the code-layout after making any changes to
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this routine! */
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# define ALIGN(n) { nop 0 }
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#else
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# define ALIGN(n) .align n
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#endif
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ENTRY(memccpy)
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.prologue
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alloc r2 = ar.pfs, 4, 40 - 4, 0, 40
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#include "softpipe.h"
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.rotr r[MEMLAT + 7], tmp1[4], tmp2[4], val[4], tmp3[2], pos0[2]
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.rotp p[MEMLAT + 6 + 1]
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mov ret0 = r0 // return NULL if no match
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.save pr, saved_pr
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mov saved_pr = pr // save the predicate registers
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mov dest = in0 // dest
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.save ar.lc, saved_lc
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mov saved_lc = ar.lc // save the loop counter
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mov saved_ec = ar.ec // save the loop counter
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.body
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mov src = in1 // src
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extr.u char = in2, 0, 8 // char
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mov len = in3 // len
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sub tmp = r0, in0 // tmp = -dest
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cmp.ne p7, p0 = r0, r0 // clear p7
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;;
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and loopcnt = 7, tmp // loopcnt = -dest % 8
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cmp.ge p6, p0 = OP_T_THRES, len // is len <= OP_T_THRES
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mov ar.ec = 0 // ec not guaranteed zero on entry
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(p6) br.cond.spnt .cpyfew // copy byte by byte
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;;
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cmp.eq p6, p0 = loopcnt, r0
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mux1 charx8 = char, @brcst
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(p6) br.cond.sptk .dest_aligned
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sub len = len, loopcnt // len -= -dest % 8
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adds loopcnt = -1, loopcnt // --loopcnt
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;;
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mov ar.lc = loopcnt
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.l1: // copy -dest % 8 bytes
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ld1 value = [src], 1 // value = *src++
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;;
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st1 [dest] = value, 1 // *dest++ = value
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cmp.eq p6, p0 = value, char
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(p6) br.cond.spnt .foundit
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br.cloop.dptk .l1
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.dest_aligned:
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and sh1 = 7, src // sh1 = src % 8
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and tmp = -8, len // tmp = len & -OPSIZ
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and asrc = -8, src // asrc = src & -OPSIZ -- align src
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shr.u loopcnt = len, 3 // loopcnt = len / 8
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and len = 7, len ;; // len = len % 8
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shl sh1 = sh1, 3 // sh1 = 8 * (src % 8)
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adds loopcnt = -1, loopcnt // --loopcnt
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mov pr.rot = 1 << 16 ;; // set rotating predicates
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sub sh2 = 64, sh1 // sh2 = 64 - sh1
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mov ar.lc = loopcnt // set LC
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cmp.eq p6, p0 = sh1, r0 // is the src aligned?
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(p6) br.cond.sptk .src_aligned ;;
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add src = src, tmp // src += len & -OPSIZ
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mov ar.ec = MEMLAT + 6 + 1 // six more passes needed
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ld8 r[1] = [asrc], 8 // r[1] = w0
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cmp.ne p6, p0 = r0, r0 ;; // clear p6
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ALIGN(32)
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.l2:
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(p[0]) ld8.s r[0] = [asrc], 8 // r[0] = w1
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(p[MEMLAT]) shr.u tmp1[0] = r[1 + MEMLAT], sh1 // tmp1 = w0 >> sh1
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(p[MEMLAT]) shl tmp2[0] = r[0 + MEMLAT], sh2 // tmp2 = w1 << sh2
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(p[MEMLAT+4]) xor tmp3[0] = val[1], charx8
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(p[MEMLAT+5]) czx1.r pos0[0] = tmp3[1]
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(p[MEMLAT+6]) chk.s r[6 + MEMLAT], .recovery1 // our data isn't
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// valid - rollback!
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(p[MEMLAT+6]) cmp.ne p6, p0 = 8, pos0[1]
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(p6) br.cond.spnt .gotit
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(p[MEMLAT+6]) st8 [dest] = val[3], 8 // store val to dest
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(p[MEMLAT+3]) or val[0] = tmp1[3], tmp2[3] // val = tmp1 | tmp2
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br.ctop.sptk .l2
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br.cond.sptk .cpyfew
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.src_aligned:
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cmp.ne p6, p0 = r0, r0 // clear p6
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mov ar.ec = MEMLAT + 2 + 1 ;; // set EC
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.l3:
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(p[0]) ld8.s r[0] = [src], 8
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(p[MEMLAT]) xor tmp3[0] = r[MEMLAT], charx8
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(p[MEMLAT+1]) czx1.r pos0[0] = tmp3[1]
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(p[MEMLAT+2]) cmp.ne p7, p0 = 8, pos0[1]
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(p[MEMLAT+2]) chk.s r[MEMLAT+2], .recovery2
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(p7) br.cond.spnt .gotit
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.back2:
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(p[MEMLAT+2]) st8 [dest] = r[MEMLAT+2], 8
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br.ctop.dptk .l3
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.cpyfew:
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cmp.eq p6, p0 = len, r0 // is len == 0 ?
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adds len = -1, len // --len;
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(p6) br.cond.spnt .restore_and_exit ;;
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mov ar.lc = len
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.l4:
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ld1 value = [src], 1
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;;
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st1 [dest] = value, 1
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cmp.eq p6, p0 = value, char
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(p6) br.cond.spnt .foundit
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br.cloop.dptk .l4 ;;
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.foundit:
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(p6) mov ret0 = dest
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.restore_and_exit:
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mov pr = saved_pr, -1 // restore the predicate registers
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mov ar.lc = saved_lc // restore the loop counter
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mov ar.ec = saved_ec ;; // restore the epilog counter
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br.ret.sptk.many b0
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.gotit:
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.pred.rel "mutex" p6, p7
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(p6) mov value = val[3] // if coming from l2
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(p7) mov value = r[MEMLAT+2] // if coming from l3
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mov ar.lc = pos0[1] ;;
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.l5:
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extr.u tmp = value, 0, 8 ;;
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st1 [dest] = tmp, 1
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shr.u value = value, 8
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br.cloop.sptk .l5 ;;
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mov ret0 = dest
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mov pr = saved_pr, -1
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mov ar.lc = saved_lc
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br.ret.sptk.many b0
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.recovery1:
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#if MEMLAT != 6
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# error "MEMLAT must be 6!"
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#endif
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adds src = -8, asrc
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mov loopcnt = ar.lc
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mov tmp = ar.ec
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;;
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(p[0]) adds src = -8, src
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;;
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(p[1]) adds src = -8, src
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sub sh1 = (MEMLAT + 6 + 1), tmp
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;;
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(p[2]) adds src = -8, src
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;;
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(p[3]) adds src = -8, src
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shl loopcnt = loopcnt, 3
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;;
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(p[4]) adds src = -8, src
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;;
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(p[5]) adds src = -8, src
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shl sh1 = sh1, 3
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;;
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(p[6]) adds src = -8, src
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;;
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(p[7]) adds src = -8, src
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shl tmp = tmp, 3
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;;
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(p[8]) adds src = -8, src
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;;
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(p[9]) adds src = -8, src
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shr.u sh2 = sh2, 3
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;;
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(p[10]) adds src = -8, src
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;;
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(p[11]) adds src = -8, src
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add len = len, loopcnt
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;;
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sub src = src, sh2
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;;
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add len = tmp, len
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add src = sh1, src
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br.cond.sptk .cpyfew
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.recovery2:
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#if MEMLAT != 6
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# error "MEMLAT must be 6!"
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#endif
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add tmp = -8, src
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(p7) br.cond.spnt .gotit
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;;
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(p[0]) add tmp = -8, tmp ;;
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(p[1]) add tmp = -8, tmp ;;
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(p[2]) add tmp = -8, tmp ;;
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(p[3]) add tmp = -8, tmp ;;
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(p[4]) add tmp = -8, tmp ;;
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(p[5]) add tmp = -8, tmp ;;
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(p[6]) add tmp = -8, tmp ;;
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(p[7]) add tmp = -8, tmp ;;
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ld8 r[MEMLAT+2] = [tmp] ;;
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xor pos0[1] = r[MEMLAT+2], charx8 ;;
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czx1.r pos0[1] = pos0[1] ;;
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cmp.ne p7, p6 = 8, pos0[1]
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(p7) br.cond.spnt .gotit
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br.cond.sptk .back2
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END(memccpy)
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