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143 lines
4.2 KiB
ArmAsm
143 lines
4.2 KiB
ArmAsm
/* Compare two memory blocks for differences in the first COUNT bytes.
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For SPARC v9.
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Copyright (C) 1998-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jan Vondrák <jvon4518@ss1000.ms.mff.cuni.cz> and
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Jakub Jelinek <jj@ultra.linux.cz>.
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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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#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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.text
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.align 32
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ENTRY(memcmp)
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#ifdef USE_BPR
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brz,pn %o2, 3f /* CTI+IEU1 Group */
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#else
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tst %o2 /* IEU1 Group */
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be,pn %XCC, 3f /* CTI */
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#endif
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andcc %o0, 7, %g0 /* IEU1 Group */
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bne,pn %icc, 8f /* CTI */
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1: andcc %o1, 7, %g1 /* IEU1 Group */
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bne,pn %icc, 10f /* CTI */
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mov 64, %g3 /* IEU0 */
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ldx [%o0], %g1 /* Load Group */
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sub %o1, %o0, %o1 /* IEU0 */
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ldx [%o0 + %o1], %g2 /* Load Group */
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add %o0, 8, %o0 /* IEU0 */
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2: mov %g1, %o3 /* IEU0 Group */
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subcc %o2, 8, %o2 /* IEU1 */
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bcs,pn %XCC, 5f /* CTI */
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ldxa [%o0] ASI_PNF, %g1 /* Load Group */
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mov %g2, %o4 /* IEU0 */
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ldxa [%o0 + %o1] ASI_PNF, %g2 /* Load Group */
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cmp %o3, %o4 /* IEU1 */
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be,pt %xcc, 2b /* CTI */
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add %o0, 8, %o0 /* IEU0 */
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7: mov -1, %o0 /* IEU1 */
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retl /* CTI+IEU1 Group */
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movgu %xcc, 1, %o0 /* Single Group */
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3: retl /* CTI+IEU1 Group */
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clr %o0 /* IEU0 */
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.align 16
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5: mov %g2, %o4 /* IEU0 */
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6: cmp %o2, -8 /* IEU1 */
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be,pn %XCC, 3b /* CTI */
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sub %g0, %o2, %o2 /* IEU0 Group */
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sllx %o2, 3, %o2 /* IEU0 Group */
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srlx %o3, %o2, %o3 /* IEU0 Group */
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srlx %o4, %o2, %o4 /* IEU0 Group */
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clr %o0 /* IEU1 */
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cmp %o3, %o4 /* IEU1 Group */
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movgu %xcc, 1, %o0 /* Single Group */
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retl /* CTI+IEU1 Group */
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movlu %xcc, -1, %o0 /* Single Group */
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8: ldub [%o0], %o3 /* Load */
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add %o0, 1, %o0 /* IEU0 */
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ldub [%o1], %o4 /* Load Group */
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add %o1, 1, %o1 /* IEU0 */
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9: cmp %o3, %o4 /* IEU1 Group */
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bne,pn %xcc, 12f /* CTI */
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subcc %o2, 1, %o2 /* IEU1 Group */
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be,pn %XCC, 3b /* CTI */
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lduba [%o0] ASI_PNF, %o3 /* Load */
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andcc %o0, 7, %g0 /* IEU1 Group */
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be,pn %icc, 1b /* CTI */
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lduba [%o1] ASI_PNF, %o4 /* Load */
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add %o0, 1, %o0 /* IEU0 Group */
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ba,pt %xcc, 9b /* CTI */
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add %o1, 1, %o1 /* IEU1 */
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.align 16
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12: mov -1, %o0 /* IEU0 Group */
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cmp %o3, %o4 /* IEU1 */
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retl /* CTI+IEU1 Group */
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movgu %xcc, 1, %o0 /* Single Group */
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.align 16
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nop /* Stub */
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10: sllx %g1, 3, %g2 /* IEU0 Group */
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sub %o1, %g1, %o1 /* IEU1 */
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sub %g3, %g2, %g3 /* IEU0 Group */
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ldxa [%o0] ASI_PNF, %g5 /* Load */
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sub %o1, %o0, %o1 /* IEU1 */
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ldxa [%o0 + %o1] ASI_PNF, %g4 /* Load Group */
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add %o0, 8, %o0 /* IEU0 */
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11: sllx %g4, %g2, %o4 /* IEU0 Group */
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ldxa [%o0 + %o1] ASI_PNF, %g4 /* Load */
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srlx %g4, %g3, %o5 /* IEU0 Group */
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mov %g5, %o3 /* IEU1 */
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ldxa [%o0] ASI_PNF, %g5 /* Load */
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subcc %o2, 8, %o2 /* IEU1 Group */
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bcs,pn %XCC, 6b /* CTI */
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or %o4, %o5, %o4 /* IEU0 */
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cmp %o3, %o4 /* IEU1 Group */
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be,pt %xcc, 11b /* CTI */
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add %o0, 8, %o0 /* IEU0 */
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mov -1, %o0 /* IEU0 */
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retl /* CTI+IEU1 Group */
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movgu %xcc, 1, %o0 /* Single Group */
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END(memcmp)
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#undef bcmp
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weak_alias (memcmp, bcmp)
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libc_hidden_builtin_def (memcmp)
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