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285 lines
5.8 KiB
ArmAsm
285 lines
5.8 KiB
ArmAsm
/* strchr (str, ch) -- Return pointer to first occurrence of CH in STR.
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For SPARC v7.
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Copyright (C) 1996, 1999, 2003 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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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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/* Normally, this uses ((xword - 0x01010101) & 0x80808080) 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 - 0x01010101) & (~xword) & 0x80808080),
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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 4
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10: 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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cmp %g4, 0
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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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cmp %g4, 0
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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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cmp %g4, 0
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be 9f
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or %o5, %lo(0x01010101), %o2
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b 6f
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ld [%o0], %g4
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1: retl
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sub %o0, 1, %o0
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ENTRY(strchr)
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andcc %o1, 0xff, %o1
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be 12f
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sll %o1, 8, %o2
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andcc %o0, 3, %g0
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or %o1, %o2, %o2
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sethi %hi(0x80808080), %o4
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sll %o2, 16, %o3
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bne 10b
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or %o3, %o2, %g2
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or %o4, %lo(0x80808080), %o3
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4: sethi %hi(0x01010101), %o5
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5: or %o5, %lo(0x01010101), %o2
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7: ld [%o0], %g4
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6: xor %g4, %g2, %g5
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sub %g4, %o2, %o4
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#ifdef EIGHTBIT_NOT_RARE
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sub %g5, %o2, %g6
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andn %o4, %g4, %o4
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andn %g6, %g5, %g5
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#else
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sub %g5, %o2, %g5
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#endif
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or %g5, %o4, %o4
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andcc %o4, %o3, %g0
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be 7b
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add %o0, 4, %o0
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/* Check every byte. */
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8: srl %g4, 24, %g5
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7: andcc %g5, 0xff, %g5
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be 9f
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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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andcc %g5, 0xff, %g5
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be 9f
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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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andcc %g5, 0xff, %g5
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be 9f
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cmp %g5, %o1
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be 2f
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andcc %g4, 0xff, %g5
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be 9f
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cmp %g5, %o1
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bne,a 6b
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ld [%o0], %g4
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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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9: retl
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clr %o0
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11: ldub [%o0], %o5
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cmp %o5, 0
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be 1f
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add %o0, 1, %o0
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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], %o5
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cmp %o5, 0
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be 1f
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add %o0, 1, %o0
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andcc %o0, 3, %g0
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be 5f
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sethi %hi(0x01010101), %o4
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ldub [%o0], %o5
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cmp %o5, 0
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be 1f
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add %o0, 1, %o0
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b 6f
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or %o4, %lo(0x01010101), %o2
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1: retl
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sub %o0, 1, %o0
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12: andcc %o0, 3, %g0
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bne 11b
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sethi %hi(0x80808080), %o4
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or %o4, %lo(0x80808080), %o3
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4: sethi %hi(0x01010101), %o4
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5: or %o4, %lo(0x01010101), %o2
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6: ld [%o0], %o5
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7: sub %o5, %o2, %o4
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#ifdef EIGHTBIT_NOT_RARE
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andn %o4, %o5, %o4
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#endif
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andcc %o4, %o3, %g0
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be 6b
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add %o0, 4, %o0
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/* Check every byte. */
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srl %o5, 24, %g5
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andcc %g5, 0xff, %g0
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be 8f
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add %o0, -4, %o4
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srl %o5, 16, %g5
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andcc %g5, 0xff, %g0
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be 8f
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add %o4, 1, %o4
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srl %o5, 8, %g5
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andcc %g5, 0xff, %g0
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be 8f
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add %o4, 1, %o4
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andcc %o5, 0xff, %g0
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bne,a 7b
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ld [%o0], %o5
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add %o4, 1, %o4
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8: retl
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mov %o4, %o0
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13: ldub [%o0], %g4
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cmp %g4, %o1
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add %o0, 1, %o0
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be,a 1f
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sub %o0, 1, %o5
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cmp %g4, 0
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be 9f
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1: 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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add %o0, 1, %o0
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be,a 1f
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sub %o0, 1, %o5
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cmp %g4, 0
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be 9f
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1: andcc %o0, 3, %g0
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be 5f
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sethi %hi(0x01010101), %o4
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ldub [%o0], %g4
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cmp %g4, %o1
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add %o0, 1, %o0
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be,a 1f
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sub %o0, 1, %o5
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cmp %g4, 0
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be 9f
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1: or %o4, %lo(0x01010101), %o2
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b 7f
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ld [%o0], %g4
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END(strchr)
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ENTRY(strrchr)
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andcc %o1, 0xff, %o1
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clr %o5
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be 12b
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sll %o1, 8, %o2
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andcc %o0, 3, %g0
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or %o1, %o2, %o2
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sethi %hi(0x80808080), %o4
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sll %o2, 16, %o3
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bne 13b
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or %o3, %o2, %g2
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or %o4, %lo(0x80808080), %o3
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4: sethi %hi(0x01010101), %o4
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5: or %o4, %lo(0x01010101), %o2
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6: ld [%o0], %g4
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7: xor %g4, %g2, %g5
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sub %g4, %o2, %o4
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#ifdef EIGHTBIT_NOT_RARE
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sub %g5, %o2, %g6
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andn %o4, %g4, %o4
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andn %g6, %g5, %g5
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#else
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sub %g5, %o2, %g5
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#endif
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or %g5, %o4, %o4
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andcc %o4, %o3, %g0
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be 6b
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add %o0, 4, %o0
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/* Check every byte. */
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3: srl %g4, 24, %g5
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8: andcc %g5, 0xff, %g5
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be 9f
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cmp %g5, %o1
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be,a 1f
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sub %o0, 4, %o5
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1: srl %g4, 16, %g5
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andcc %g5, 0xff, %g5
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be 9f
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cmp %g5, %o1
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be,a 1f
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sub %o0, 3, %o5
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1: srl %g4, 8, %g5
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andcc %g5, 0xff, %g5
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be 9f
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cmp %g5, %o1
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be,a 1f
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sub %o0, 2, %o5
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1: andcc %g4, 0xff, %g5
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be 9f
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cmp %g5, %o1
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be,a 1f
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sub %o0, 1, %o5
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1: b 7b
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ld [%o0], %g4
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9: retl
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mov %o5, %o0
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END(strrchr)
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weak_alias(strchr, index)
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weak_alias(strrchr, rindex)
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libc_hidden_builtin_def (strchr)
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libc_hidden_builtin_def (strrchr)
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