1 /* strrchr with SSE2 with bsf and bsr
2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
3 Contributed by Intel Corporation.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
24 # define CFI_PUSH(REG) \
25 cfi_adjust_cfa_offset (4); \
26 cfi_rel_offset (REG, 0)
28 # define CFI_POP(REG) \
29 cfi_adjust_cfa_offset (-4); \
32 # define PUSH(REG) pushl REG; CFI_PUSH (REG)
33 # define POP(REG) popl REG; CFI_POP (REG)
40 ENTRY (__strrchr_sse2_bsf)
43 movd STR2(%esp), %xmm1
48 punpcklbw %xmm1, %xmm1
49 punpcklbw %xmm1, %xmm1
53 pshufd $0, %xmm1, %xmm1
56 /* unaligned string. */
60 /* Find where NULL is. */
62 /* Check if there is a match. */
66 jnz L(unaligned_match1)
84 L(unaligned_return_value1):
100 jnz L(unaligned_return_value1)
116 /* Hancle unaligned string. */
123 /* Find where NULL is. */
125 /* Check if there is a match. */
127 /* Remove the leading bytes. */
132 jnz L(unaligned_match)
149 L(unaligned_return_value):
166 jnz L(unaligned_return_value)
173 lea (%edi, %ecx), %esi
175 /* Loop start on aligned string. */
238 jnz L(return_value_1)
281 END (__strrchr_sse2_bsf)