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260 lines
8.1 KiB
ArmAsm
260 lines
8.1 KiB
ArmAsm
/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
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than N.
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For SPARC v9.
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Copyright (C) 1998-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and
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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(__memchr)
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and %o1, 0xff, %o1 /* IEU0 Group */
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#ifdef USE_BPR
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brz,pn %o2, 12f /* CTI+IEU1 */
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#else
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tst %o2 /* IEU1 */
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be,pn %XCC, 12f /* CTI */
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#endif
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sll %o1, 8, %g3 /* IEU0 Group */
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add %o0, %o2, %o2 /* IEU1 */
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sethi %hi(0x01010101), %g1 /* IEU0 Group */
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or %g3, %o1, %g3 /* IEU1 */
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ldub [%o0], %o3 /* Load */
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sllx %g3, 16, %g5 /* 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 %g3, %g5, %g3 /* IEU1 */
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sllx %g3, 32, %g5 /* IEU0 Group */
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cmp %o3, %o1 /* IEU1 */
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be,pn %xcc, 13f /* CTI */
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or %g1, %g2, %g1 /* IEU0 Group */
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andcc %o0, 7, %g0 /* IEU1 */
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bne,a,pn %icc, 21f /* CTI */
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add %o0, 1, %o0 /* IEU0 Group */
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ldx [%o0], %o3 /* Load Group */
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sllx %g1, 7, %g2 /* IEU0 */
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or %g3, %g5, %g3 /* IEU1 */
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1: add %o0, 8, %o0 /* IEU0 Group */
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xor %o3, %g3, %o4 /* IEU1 */
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/* %g1 = 0101010101010101 *
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* %g2 = 8080088080808080 *
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* %g3 = c c c c c c c c *
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* %o3 = value *
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* %o4 = value XOR c */
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2: cmp %o0, %o2 /* IEU1 Group */
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bgu,pn %XCC, 11f /* CTI */
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ldxa [%o0] ASI_PNF, %o3 /* Load */
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sub %o4, %g1, %o5 /* IEU0 Group */
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add %o0, 8, %o0 /* IEU1 */
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#ifdef EIGHTBIT_NOT_RARE
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andn %o5, %o4, %o5 /* IEU0 Group */
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#endif
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andcc %o5, %g2, %g0 /* IEU1 Group */
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be,a,pt %xcc, 2b /* CTI */
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xor %o3, %g3, %o4 /* IEU0 */
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srlx %o4, 56, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 3f /* CTI */
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srlx %o4, 48, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 4f /* CTI */
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srlx %o4, 40, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 5f /* CTI */
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srlx %o4, 32, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 6f /* CTI */
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srlx %o4, 24, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 7f /* CTI */
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srlx %o4, 16, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 8f /* CTI */
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srlx %o4, 8, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 9f /* CTI */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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bne,pt %icc, 2b /* CTI */
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xor %o3, %g3, %o4 /* IEU0 */
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retl /* CTI+IEU1 Group */
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add %o0, -9, %o0 /* IEU0 */
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.align 16
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3: retl /* CTI+IEU1 Group */
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add %o0, -16, %o0 /* IEU0 */
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4: retl /* CTI+IEU1 Group */
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add %o0, -15, %o0 /* IEU0 */
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5: retl /* CTI+IEU1 Group */
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add %o0, -14, %o0 /* IEU0 */
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6: retl /* CTI+IEU1 Group */
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add %o0, -13, %o0 /* IEU0 */
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7: retl /* CTI+IEU1 Group */
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add %o0, -12, %o0 /* IEU0 */
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8: retl /* CTI+IEU1 Group */
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add %o0, -11, %o0 /* IEU0 */
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9: retl /* CTI+IEU1 Group */
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add %o0, -10, %o0 /* IEU0 */
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11: sub %o4, %g1, %o5 /* IEU0 Group */
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sub %o0, 8, %o0 /* IEU1 */
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andcc %o5, %g2, %g0 /* IEU1 Group */
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be,pt %xcc, 12f /* CTI */
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sub %o2, %o0, %o2 /* IEU0 */
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tst %o2 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 56, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 13f /* CTI */
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cmp %o2, 1 /* IEU0 */
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be,pn %XCC, 12f /* CTI Group */
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srlx %o4, 48, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 14f /* CTI */
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cmp %o2, 2 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 40, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 15f /* CTI */
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cmp %o2, 3 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 32, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 16f /* CTI */
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cmp %o2, 4 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 24, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 17f /* CTI */
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cmp %o2, 5 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 16, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 18f /* CTI */
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cmp %o2, 6 /* IEU1 Group */
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be,pn %XCC, 12f /* CTI */
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srlx %o4, 8, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 19f /* CTI */
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nop /* IEU0 */
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12: retl /* CTI+IEU1 Group */
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clr %o0 /* IEU0 */
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nop /* Stub */
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13: retl /* CTI+IEU1 Group */
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nop /* IEU0 */
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14: retl /* CTI+IEU1 Group */
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add %o0, 1, %o0 /* IEU0 */
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15: retl /* CTI+IEU1 Group */
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add %o0, 2, %o0 /* IEU0 */
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16: retl /* CTI+IEU1 Group */
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add %o0, 3, %o0 /* IEU0 */
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17: retl /* CTI+IEU1 Group */
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add %o0, 4, %o0 /* IEU0 */
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18: retl /* CTI+IEU1 Group */
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add %o0, 5, %o0 /* IEU0 */
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19: retl /* CTI+IEU1 Group */
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add %o0, 6, %o0 /* IEU0 */
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21: cmp %o0, %o2 /* IEU1 */
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be,pn %XCC, 12b /* CTI */
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sllx %g1, 7, %g2 /* IEU0 Group */
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ldub [%o0], %o3 /* Load */
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or %g3, %g5, %g3 /* IEU1 */
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22: andcc %o0, 7, %g0 /* IEU1 Group */
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be,a,pn %icc, 1b /* CTI */
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ldx [%o0], %o3 /* Load */
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cmp %o3, %o1 /* IEU1 Group */
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be,pn %xcc, 23f /* CTI */
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add %o0, 1, %o0 /* IEU0 */
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cmp %o0, %o2 /* IEU1 Group */
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bne,a,pt %XCC, 22b /* CTI */
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ldub [%o0], %o3 /* Load */
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retl /* CTI+IEU1 Group */
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clr %o0 /* IEU0 */
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23: retl /* CTI+IEU1 Group */
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add %o0, -1, %o0 /* IEU0 */
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END(__memchr)
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weak_alias (__memchr, memchr)
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libc_hidden_builtin_def (memchr)
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