| /* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less |
| than N. |
| For SPARC v7. |
| Copyright (C) 1996, 1999, 2000, 2003 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek <jj@ultra.linux.cz> and |
| David S. Miller <davem@caip.rutgers.edu>. |
| This version is developed using the same algorithm as the fast C |
| version which carries the following introduction: |
| Based on strlen implementation by Torbjorn Granlund (tege@sics.se), |
| with help from Dan Sahlin (dan@sics.se) and |
| commentary by Jim Blandy (jimb@ai.mit.edu); |
| adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), |
| and implemented by Roland McGrath (roland@ai.mit.edu). |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| |
| .text |
| .align 4 |
| ENTRY(__memchr) |
| andcc %o1, 0xff, %o1 |
| sll %o1, 8, %g6 |
| andcc %o0, 3, %g0 |
| or %o1, %g6, %g6 |
| sll %g6, 16, %o3 |
| be 10f |
| or %o3, %g6, %g2 |
| cmp %o2, 0 |
| be 9f |
| sethi %hi(0x80808080), %o4 |
| ldub [%o0], %g4 |
| cmp %g4, %o1 |
| be 1f |
| add %o0, 1, %o0 |
| subcc %o2, 1, %o2 |
| be 9f |
| andcc %o0, 3, %g0 |
| be 4f |
| or %o4, %lo(0x80808080), %o3 |
| ldub [%o0], %g4 |
| cmp %g4, %o1 |
| be 1f |
| add %o0, 1, %o0 |
| subcc %o2, 1, %o2 |
| be 9f |
| andcc %o0, 3, %g0 |
| be 5f |
| sethi %hi(0x01010101), %o5 |
| ldub [%o0], %g4 |
| cmp %g4, %o1 |
| be 1f |
| add %o0, 1, %o0 |
| subcc %o2, 1, %o2 |
| bne,a 7f |
| and %o2, 3, %g1 |
| retl |
| clr %o0 |
| 1: retl |
| sub %o0, 1, %o0 |
| 10: sethi %hi(0x80808080), %o4 |
| or %o4, %lo(0x80808080), %o3 |
| 4: sethi %hi(0x01010101), %o5 |
| 5: and %o2, 3, %g1 |
| 7: andcc %o2, 0xfffffffc, %o2 |
| be 0f |
| or %o5, %lo(0x01010101), %g6 |
| ld [%o0], %g4 |
| 6: xor %g4, %g2, %g5 |
| add %o0, 4, %o0 |
| sub %g5, %g6, %g5 |
| andcc %g5, %o3, %g0 |
| bne 8f |
| subcc %o2, 4, %o2 |
| bne,a 6b |
| ld [%o0], %g4 |
| 0: cmp %g1, 0 |
| 1: be 9f |
| add %o0, 4, %o0 |
| ldub [%o0 - 4], %g4 |
| cmp %g4, %o1 |
| be 4f |
| cmp %g1, 1 |
| be 9f |
| ldub [%o0 - 3], %g4 |
| cmp %g4, %o1 |
| be 3f |
| cmp %g1, 2 |
| be 9f |
| ldub [%o0 - 2], %g4 |
| cmp %g4, %o1 |
| be 2f |
| nop |
| 9: retl |
| clr %o0 |
| |
| /* Check every byte. */ |
| 8: srl %g4, 24, %g5 |
| and %g5, 0xff, %g5 |
| cmp %g5, %o1 |
| be 4f |
| srl %g4, 16, %g5 |
| and %g5, 0xff, %g5 |
| cmp %g5, %o1 |
| be 3f |
| srl %g4, 8, %g5 |
| and %g5, 0xff, %g5 |
| cmp %g5, %o1 |
| be 2f |
| and %g4, 0xff, %g5 |
| cmp %g5, %o1 |
| be 1f |
| cmp %o2, 0 |
| bne,a 6b |
| ld [%o0], %g4 |
| b 1b |
| cmp %g1, 0 |
| 1: retl |
| sub %o0, 1, %o0 |
| 2: retl |
| sub %o0, 2, %o0 |
| 3: retl |
| sub %o0, 3, %o0 |
| 4: retl |
| sub %o0, 4, %o0 |
| END(__memchr) |
| |
| weak_alias (__memchr, memchr) |
| #if !__BOUNDED_POINTERS__ |
| weak_alias (__memchr, __ubp_memchr) |
| #endif |
| libc_hidden_builtin_def (memchr) |
