diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/multiarch/memcmp.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/multiarch/memcmp.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/multiarch/memcmp.S b/REORG.TODO/sysdeps/x86_64/multiarch/memcmp.S new file mode 100644 index 0000000000..0c9804b7e9 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/multiarch/memcmp.S @@ -0,0 +1,78 @@ +/* Multiple versions of memcmp + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2010-2017 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> + +/* Define multiple versions only for the definition in libc. */ +#if IS_IN (libc) + .text +ENTRY(memcmp) + .type memcmp, @gnu_indirect_function + LOAD_RTLD_GLOBAL_RO_RDX + HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER) + jnz 1f + HAS_ARCH_FEATURE (AVX2_Usable) + jz 1f + HAS_CPU_FEATURE (MOVBE) + jz 1f + HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) + jz 1f + leaq __memcmp_avx2_movbe(%rip), %rax + ret + +1: HAS_CPU_FEATURE (SSSE3) + jnz 2f + leaq __memcmp_sse2(%rip), %rax + ret + +2: HAS_CPU_FEATURE (SSE4_1) + jz 3f + leaq __memcmp_sse4_1(%rip), %rax + ret + +3: leaq __memcmp_ssse3(%rip), %rax + ret + +END(memcmp) + +# undef ENTRY +# define ENTRY(name) \ + .type __memcmp_sse2, @function; \ + .p2align 4; \ + .globl __memcmp_sse2; \ + .hidden __memcmp_sse2; \ + __memcmp_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2 + +# ifdef SHARED +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal memcmp calls through a PLT. + The speedup we get from using SSE4 instructions is likely eaten away + by the indirect call in the PLT. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_memcmp; __GI_memcmp = __memcmp_sse2 +# endif +#endif + +#include "../memcmp.S" |