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lib/x86: allow choosing adler32_sse2() at runtime

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Now that we detect CPU features on 32-bit x86, allow the SSE2
implementation of Adler-32 to be selected at runtime based on the
presence of the SSE2 feature.
This commit is contained in:
Eric Biggers 2018-02-18 23:03:26 -08:00
parent 0d1260be99
commit 1617206086
3 changed files with 20 additions and 3 deletions
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3
common/common_defs.h
View File

@ -133,6 +133,9 @@ typedef size_t machine_word_t;
* Which targets are supported with the 'target' function attribute and have
* intrinsics that work within 'target'-ed functions?
*/
#ifndef COMPILER_SUPPORTS_SSE2_TARGET_INTRINSICS
# define COMPILER_SUPPORTS_SSE2_TARGET_INTRINSICS 0
#endif
#ifndef COMPILER_SUPPORTS_PCLMUL_TARGET_INTRINSICS
# define COMPILER_SUPPORTS_PCLMUL_TARGET_INTRINSICS 0
#endif

1
common/compiler_gcc.h
View File

@ -80,6 +80,7 @@
* for this so we have to check its version.
*/
# if GCC_PREREQ(4, 9) || CLANG_PREREQ(3, 8, 7030000)
# define COMPILER_SUPPORTS_SSE2_TARGET_INTRINSICS 1
# define COMPILER_SUPPORTS_PCLMUL_TARGET_INTRINSICS \
COMPILER_SUPPORTS_PCLMUL_TARGET
# define COMPILER_SUPPORTS_AVX2_TARGET_INTRINSICS \

19
lib/x86/adler32_impl.h
View File

@ -81,7 +81,10 @@ adler32_avx2_chunk(const __m256i *p, const __m256i *const end, u32 *s1, u32 *s2)
#endif /* AVX2 implementation */
/* SSE2 implementation */
#if !defined(DEFAULT_IMPL) && defined(__SSE2__)
#undef DISPATCH_SSE2
#if !defined(DEFAULT_IMPL) && \
(defined(__SSE2__) || (X86_CPU_FEATURES_ENABLED && \
COMPILER_SUPPORTS_SSE2_TARGET_INTRINSICS))
# define FUNCNAME adler32_sse2
# define FUNCNAME_CHUNK adler32_sse2_chunk
# define IMPL_ALIGNMENT 16
@ -92,8 +95,14 @@ adler32_avx2_chunk(const __m256i *p, const __m256i *const end, u32 *s1, u32 *s2)
* would behave incorrectly.
*/
# define IMPL_MAX_CHUNK_SIZE (32 * (0x7FFF / 0xFF))
# define ATTRIBUTES
# define DEFAULT_IMPL adler32_sse2
# ifdef __SSE2__
# define ATTRIBUTES
# define DEFAULT_IMPL adler32_sse2
# else
# define ATTRIBUTES __attribute__((target("sse2")))
# define DISPATCH 1
# define DISPATCH_SSE2 1
# endif
# include <emmintrin.h>
static forceinline ATTRIBUTES void
adler32_sse2_chunk(const __m128i *p, const __m128i *const end, u32 *s1, u32 *s2)
@ -179,6 +188,10 @@ arch_select_adler32_func(void)
#ifdef DISPATCH_AVX2
if (features & X86_CPU_FEATURE_AVX2)
return adler32_avx2;
#endif
#ifdef DISPATCH_SSE2
if (features & X86_CPU_FEATURE_SSE2)
return adler32_sse2;
#endif
return NULL;
}