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179 lines
5.9 KiB
ArmAsm
179 lines
5.9 KiB
ArmAsm
/* rawmemchr (str, ch) -- Return pointer to first occurrence of CH in STR.
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For SPARC v9.
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jj@ultra.linux.cz>.
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This version is developed using the same algorithm as the fast C
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version which carries the following introduction:
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Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
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with help from Dan Sahlin (dan@sics.se) and
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commentary by Jim Blandy (jimb@ai.mit.edu);
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adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
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and implemented by Roland McGrath (roland@ai.mit.edu).
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <asm/asi.h>
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#ifndef XCC
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#define XCC xcc
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#define USE_BPR
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.register %g2, #scratch
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.register %g3, #scratch
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#endif
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/* Normally, this uses
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((xword - 0x0101010101010101) & 0x8080808080808080) test
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to find out if any byte in xword could be zero. This is fast, but
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also gives false alarm for any byte in range 0x81-0xff. It does
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not matter for correctness, as if this test tells us there could
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be some zero byte, we check it byte by byte, but if bytes with
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high bits set are common in the strings, then this will give poor
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performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
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will use one tick slower, but more precise test
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((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
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which does not give any false alarms (but if some bits are set,
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one cannot assume from it which bytes are zero and which are not).
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It is yet to be measured, what is the correct default for glibc
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in these days for an average user.
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*/
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.text
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.align 32
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ENTRY(__rawmemchr)
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and %o1, 0xff, %o1 /* IEU0 Group */
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sethi %hi(0x01010101), %g1 /* IEU1 */
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ldub [%o0], %o3 /* Load */
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sll %o1, 8, %o4 /* IEU0 Group */
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or %g1, %lo(0x01010101), %g1 /* IEU1 */
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sllx %g1, 32, %g2 /* IEU0 Group */
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or %o4, %o1, %o4 /* IEU1 */
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andcc %o0, 7, %g0 /* IEU1 Group */
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sll %o4, 16, %g5 /* IEU0 */
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or %o4, %g5, %o4 /* IEU0 Group */
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or %g1, %g2, %g1 /* IEU1 */
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bne,pn %icc, 32f /* CTI */
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sllx %o4, 32, %g5 /* IEU0 Group */
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cmp %o3, %o1 /* IEU1 */
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be,pn %icc, 30f /* CTI */
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sllx %g1, 7, %g2 /* IEU0 Group */
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18: ldx [%o0], %o3 /* Load */
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or %o4, %g5, %o4 /* IEU1 */
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add %o0, 8, %o0 /* IEU0 Group */
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19: xor %o3, %o4, %o3 /* IEU0 Group */
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sub %o3, %g1, %o2 /* IEU0 Group */
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#ifdef EIGHTBIT_NOT_RARE
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andn %o2, %o3, %o5 /* IEU0 Group */
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ldxa [%o0] ASI_PNF, %o3 /* Load */
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andcc %o5, %g2, %g0 /* IEU1 Group */
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#else
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ldxa [%o0] ASI_PNF, %o3 /* Load */
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andcc %o2, %g2, %g0 /* IEU1 Group */
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#endif
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be,pt %xcc, 19b /* CTI */
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add %o0, 8, %o0 /* IEU0 */
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addcc %o2, %g1, %g3 /* IEU1 Group */
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srlx %o2, 32, %o2 /* IEU0 */
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20: andcc %o2, %g2, %g0 /* IEU1 Group */
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be,pn %xcc, 21f /* CTI */
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srlx %g3, 56, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 29f /* CTI */
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srlx %g3, 48, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 28f /* CTI */
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srlx %g3, 40, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 27f /* CTI */
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srlx %g3, 32, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 26f /* CTI */
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21: srlx %g3, 24, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 25f /* CTI */
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srlx %g3, 16, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 24f /* CTI */
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srlx %g3, 8, %o2 /* IEU0 */
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andcc %o2, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 23f /* CTI */
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xor %o3, %o4, %o3 /* IEU0 */
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andcc %g3, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 22f /* CTI */
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sub %o3, %g1, %o2 /* IEU0 */
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ldxa [%o0] ASI_PNF, %o3 /* Load */
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andcc %o2, %g2, %g0 /* IEU1 Group */
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be,pt %xcc, 19b /* CTI */
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add %o0, 8, %o0 /* IEU0 */
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addcc %o2, %g1, %g3 /* IEU1 Group */
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ba,pt %xcc, 20b /* CTI */
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srlx %o2, 32, %o2 /* IEU0 */
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.align 16
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22: retl /* CTI+IEU1 Group */
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add %o0, -9, %o0 /* IEU0 */
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23: retl /* CTI+IEU1 Group */
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add %o0, -10, %o0 /* IEU0 */
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24: retl /* CTI+IEU1 Group */
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add %o0, -11, %o0 /* IEU0 */
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25: retl /* CTI+IEU1 Group */
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add %o0, -12, %o0 /* IEU0 */
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26: retl /* CTI+IEU1 Group */
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add %o0, -13, %o0 /* IEU0 */
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27: retl /* CTI+IEU1 Group */
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add %o0, -14, %o0 /* IEU0 */
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28: retl /* CTI+IEU1 Group */
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add %o0, -15, %o0 /* IEU0 */
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29: retl /* CTI+IEU1 Group */
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add %o0, -16, %o0 /* IEU0 */
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30: retl /* CTI+IEU1 Group */
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nop /* IEU0 */
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.align 16
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32: andcc %o0, 7, %g0 /* IEU1 Group */
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be,a,pn %icc, 18b /* CTI */
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sllx %g1, 7, %g2 /* IEU0 */
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add %o0, 1, %o0 /* IEU0 Group */
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cmp %o3, %o1 /* IEU1 */
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bne,a,pt %icc, 32b /* CTI */
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lduba [%o0] ASI_PNF, %o3 /* Load */
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retl /* CTI+IEU1 Group */
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add %o0, -1, %o0 /* IEU0 */
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END(__rawmemchr)
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libc_hidden_def (__rawmemchr)
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weak_alias (__rawmemchr, rawmemchr)
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