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AVX2 Adler-32 actually requires gcc 4.9+

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This commit is contained in:
Eric Biggers 2016-09-09 21:44:07 -07:00
parent 36f8286db7
commit 9c5c05201a
1 changed files with 5 additions and 1 deletions
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6
common/compiler_gcc.h
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@ -40,9 +40,13 @@
(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
(GCC_PREREQ(4, 7) || __has_builtin(__builtin_ia32_pdep_di)))
/*
* Note: AVX2 support was added in gcc 4.7, but AVX2 intrinsics don't work in
* __attribute__((target("avx2"))) functions until gcc 4.9.
*/
#define COMPILER_SUPPORTS_AVX2_TARGET \
(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
(GCC_PREREQ(4, 7) || __has_builtin(__builtin_ia32_pmaddwd256)))
(GCC_PREREQ(4, 9) || __has_builtin(__builtin_ia32_pmaddwd256)))
/* Newer gcc supports __BYTE_ORDER__. Older gcc doesn't. */
#ifdef __BYTE_ORDER__