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143 lines
3.1 KiB
ArmAsm
143 lines
3.1 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 v7.
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Copyright (C) 1996-2015 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> and
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David S. Miller <davem@caip.rutgers.edu>.
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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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.text
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.align 4
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ENTRY(__memchr)
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andcc %o1, 0xff, %o1
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sll %o1, 8, %g6
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andcc %o0, 3, %g0
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or %o1, %g6, %g6
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sll %g6, 16, %o3
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be 10f
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or %o3, %g6, %g2
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cmp %o2, 0
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be 9f
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sethi %hi(0x80808080), %o4
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ldub [%o0], %g4
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cmp %g4, %o1
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be 1f
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add %o0, 1, %o0
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subcc %o2, 1, %o2
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be 9f
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andcc %o0, 3, %g0
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be 4f
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or %o4, %lo(0x80808080), %o3
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ldub [%o0], %g4
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cmp %g4, %o1
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be 1f
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add %o0, 1, %o0
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subcc %o2, 1, %o2
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be 9f
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andcc %o0, 3, %g0
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be 5f
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sethi %hi(0x01010101), %o5
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ldub [%o0], %g4
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cmp %g4, %o1
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be 1f
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add %o0, 1, %o0
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subcc %o2, 1, %o2
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bne,a 7f
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and %o2, 3, %g1
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retl
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clr %o0
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1: retl
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sub %o0, 1, %o0
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10: sethi %hi(0x80808080), %o4
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or %o4, %lo(0x80808080), %o3
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4: sethi %hi(0x01010101), %o5
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5: and %o2, 3, %g1
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7: andcc %o2, 0xfffffffc, %o2
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be 0f
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or %o5, %lo(0x01010101), %g6
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ld [%o0], %g4
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6: xor %g4, %g2, %g5
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add %o0, 4, %o0
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sub %g5, %g6, %g5
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andcc %g5, %o3, %g0
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bne 8f
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subcc %o2, 4, %o2
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bne,a 6b
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ld [%o0], %g4
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0: cmp %g1, 0
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1: be 9f
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add %o0, 4, %o0
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ldub [%o0 - 4], %g4
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cmp %g4, %o1
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be 4f
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cmp %g1, 1
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be 9f
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ldub [%o0 - 3], %g4
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cmp %g4, %o1
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be 3f
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cmp %g1, 2
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be 9f
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ldub [%o0 - 2], %g4
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cmp %g4, %o1
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be 2f
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nop
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9: retl
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clr %o0
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/* Check every byte. */
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8: srl %g4, 24, %g5
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and %g5, 0xff, %g5
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cmp %g5, %o1
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be 4f
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srl %g4, 16, %g5
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and %g5, 0xff, %g5
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cmp %g5, %o1
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be 3f
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srl %g4, 8, %g5
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and %g5, 0xff, %g5
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cmp %g5, %o1
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be 2f
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and %g4, 0xff, %g5
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cmp %g5, %o1
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be 1f
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cmp %o2, 0
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bne,a 6b
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ld [%o0], %g4
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b 1b
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cmp %g1, 0
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1: retl
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sub %o0, 1, %o0
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2: retl
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sub %o0, 2, %o0
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3: retl
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sub %o0, 3, %o0
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4: retl
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sub %o0, 4, %o0
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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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