1 /* strlen with SSE2 and BSF
2 Copyright (C) 2010, 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/>. */
20 #if defined SHARED && !defined NOT_IN_libc
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)
34 #define PARMS 4 + 8 /* Preserve ESI and EDI. */
36 #define ENTRANCE PUSH (%esi); PUSH (%edi); cfi_remember_state
37 #define RETURN POP (%edi); POP (%esi); ret; \
38 cfi_restore_state; cfi_remember_state
41 ENTRY ( __strlen_sse2_bsf)
76 pcmpeqb 16(%eax), %xmm0
81 pcmpeqb 32(%eax), %xmm1
86 pcmpeqb 48(%eax), %xmm2
91 pcmpeqb 64(%eax), %xmm3
123 END ( __strlen_sse2_bsf)