| /* Multiple versions of memchr |
| All versions must be listed in ifunc-impl-list.c. |
| Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| Contributed by Intel Corporation. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <init-arch.h> |
| |
| #ifndef NOT_IN_libc |
| # define CFI_POP(REG) \ |
| cfi_adjust_cfa_offset (-4); \ |
| cfi_restore (REG) |
| |
| # define CFI_PUSH(REG) \ |
| cfi_adjust_cfa_offset (4); \ |
| cfi_rel_offset (REG, 0) |
| |
| .text |
| ENTRY(__memchr) |
| .type __memchr, @gnu_indirect_function |
| pushl %ebx |
| CFI_PUSH (%ebx) |
| LOAD_PIC_REG(bx) |
| cmpl $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx) |
| jne 1f |
| call __init_cpu_features |
| |
| 1: testl $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx) |
| jz 2f |
| testl $bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx) |
| jz 3f |
| |
| leal __memchr_sse2@GOTOFF(%ebx), %eax |
| popl %ebx |
| CFI_POP (%ebx) |
| ret |
| |
| CFI_PUSH (%ebx) |
| |
| 2: leal __memchr_ia32@GOTOFF(%ebx), %eax |
| popl %ebx |
| CFI_POP (%ebx) |
| ret |
| |
| CFI_PUSH (%ebx) |
| |
| 3: leal __memchr_sse2_bsf@GOTOFF(%ebx), %eax |
| popl %ebx |
| CFI_POP (%ebx) |
| ret |
| END(__memchr) |
| |
| weak_alias(__memchr, memchr) |
| |
| # undef ENTRY |
| # define ENTRY(name) \ |
| .type __memchr_ia32, @function; \ |
| .globl __memchr_ia32; \ |
| .p2align 4; \ |
| __memchr_ia32: cfi_startproc; \ |
| CALL_MCOUNT |
| # undef END |
| # define END(name) \ |
| cfi_endproc; .size __memchr_ia32, .-__memchr_ia32 |
| |
| # undef libc_hidden_builtin_def |
| /* IFUNC doesn't work with the hidden functions in shared library since |
| they will be called without setting up EBX needed for PLT which is |
| used by IFUNC. */ |
| # define libc_hidden_builtin_def(name) \ |
| .globl __GI_memchr; __GI_memchr = __memchr_ia32 |
| |
| #endif |
| #include "../../memchr.S" |
