1 /* strlen with SSE2 and BSF
2 Copyright (C) 2010-2021 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/>. */
19 #if defined SHARED && IS_IN (libc)
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)
33 #define PARMS 4 + 8 /* Preserve ESI and EDI. */
35 #define ENTRANCE PUSH (%esi); PUSH (%edi); cfi_remember_state
36 #define RETURN POP (%edi); POP (%esi); ret; \
37 cfi_restore_state; cfi_remember_state
40 ENTRY ( __strlen_sse2_bsf)
75 pcmpeqb 16(%eax), %xmm0
80 pcmpeqb 32(%eax), %xmm1
85 pcmpeqb 48(%eax), %xmm2
90 pcmpeqb 64(%eax), %xmm3
122 END ( __strlen_sse2_bsf)