Enable use of bswap intrinsics in clang
Necessary because clang disguises itself as an older (__GNUC_MINOR__ = 2) GCC.
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@ -39,6 +39,10 @@ extern "C" {
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# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
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#endif
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#ifndef __has_builtin
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# define __has_builtin(x) 0 /* compat. with non-clang compilers */
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#endif
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/* code only tested on 32 and 64 bits systems */
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#define MEM_STATIC_ASSERT(c) { enum { MEM_static_assert = 1/(int)(!!(c)) }; }
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MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); }
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@ -198,7 +202,8 @@ MEM_STATIC U32 MEM_swap32(U32 in)
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{
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#if defined(_MSC_VER) /* Visual Studio */
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return _byteswap_ulong(in);
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#elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)
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#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
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|| (defined(__clang__) && __has_builtin(__builtin_bswap32))
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return __builtin_bswap32(in);
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#else
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return ((in << 24) & 0xff000000 ) |
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@ -212,7 +217,8 @@ MEM_STATIC U64 MEM_swap64(U64 in)
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{
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#if defined(_MSC_VER) /* Visual Studio */
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return _byteswap_uint64(in);
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#elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)
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#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
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|| (defined(__clang__) && __has_builtin(__builtin_bswap64))
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return __builtin_bswap64(in);
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#else
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return ((in << 56) & 0xff00000000000000ULL) |
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