1 /* strrchr with SSE2 with bsf and bsr
2 Copyright (C) 2011-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 # define CFI_PUSH(REG) \
24 cfi_adjust_cfa_offset (4); \
25 cfi_rel_offset (REG, 0)
27 # define CFI_POP(REG) \
28 cfi_adjust_cfa_offset (-4); \
31 # define PUSH(REG) pushl REG; CFI_PUSH (REG)
32 # define POP(REG) popl REG; CFI_POP (REG)
39 ENTRY (__strrchr_sse2_bsf)
42 movd STR2(%esp), %xmm1
47 punpcklbw %xmm1, %xmm1
48 punpcklbw %xmm1, %xmm1
52 pshufd $0, %xmm1, %xmm1
55 /* unaligned string. */
59 /* Find where NULL is. */
61 /* Check if there is a match. */
65 jnz L(unaligned_match1)
83 L(unaligned_return_value1):
99 jnz L(unaligned_return_value1)
115 /* Hancle unaligned string. */
122 /* Find where NULL is. */
124 /* Check if there is a match. */
126 /* Remove the leading bytes. */
131 jnz L(unaligned_match)
148 L(unaligned_return_value):
165 jnz L(unaligned_return_value)
172 lea (%edi, %ecx), %esi
174 /* Loop start on aligned string. */
237 jnz L(return_value_1)
280 END (__strrchr_sse2_bsf)