1 /* Copyright (C) 2009, 2011 Free Software Foundation, Inc.
2 Contributed by Ulrich Drepper <drepper@redhat.com>.
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 <http://www.gnu.org/licenses/>. */
20 #include <init-arch.h>
23 /* Define multiple versions only for the definition in lib. */
27 .type rawmemchr, @gnu_indirect_function
28 cmpl $0, __cpu_features+KIND_OFFSET(%rip)
30 call __init_cpu_features
31 1: testl $bit_Prefer_PMINUB_for_stringop, __cpu_features+FEATURE_OFFSET+index_Prefer_PMINUB_for_stringop(%rip)
33 testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
35 leaq __rawmemchr_sse42(%rip), %rax
37 2: leaq __rawmemchr_sse2(%rip), %rax
41 strong_alias (rawmemchr, __rawmemchr)
44 .section .text.sse4.2,"ax",@progbits
46 .type __rawmemchr_sse42, @function
66 2: pcmpestri $0x08, 16(%rdi), %xmm1
70 leaq (%rdi,%rcx), %rax
77 .size __rawmemchr_sse42, .-__rawmemchr_sse42
81 # define ENTRY(name) \
82 .type __rawmemchr_sse2, @function; \
84 __rawmemchr_sse2: cfi_startproc; \
88 cfi_endproc; .size __rawmemchr_sse2, .-__rawmemchr_sse2
89 # undef libc_hidden_builtin_def
90 /* It doesn't make sense to send libc-internal rawmemchr calls through a PLT.
91 The speedup we get from using SSE4.2 instruction is likely eaten away
92 by the indirect call in the PLT. */
93 # define libc_hidden_builtin_def(name) \
94 .globl __GI___rawmemchr; __GI___rawmemchr = __rawmemchr_sse2
97 #include "../rawmemchr.S"