1 /* strchr with SSE2 with bsf
2 Copyright (C) 2011 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)
36 # define ENTRANCE PUSH(%edi)
37 # define RETURN POP(%edi); ret; CFI_PUSH(%edi);
43 ENTRY (__strchr_sse2_bsf)
47 movd STR2(%esp), %xmm1
51 punpcklbw %xmm1, %xmm1
52 punpcklbw %xmm1, %xmm1
55 pshufd $0, %xmm1, %xmm1
58 /* Handle unaligned string. */
63 /* Find where NULL is. */
65 /* Check if there is a match. */
67 /* Remove the leading bytes. */
71 je L(unaligned_no_match)
72 /* Check which byte is a match. */
74 /* Is there a NULL? */
79 /* Return NULL if NULL comes first. */
87 L(unaligned_no_match):
95 /* Loop start on aligned string. */
139 /* There is a match. First find where NULL is. */
143 /* Check if NULL comes first. */
157 END (__strchr_sse2_bsf)