Merge commit 'f07ccd6e4fbc5bbfeb94d40e0f14bc527a7d5439' as 'cpp/simdcomp'

cpp/simdcomp/include/portability.h

@@ -0,0 +1,81 @@
+/**
+ * This code is released under a BSD License.
+ */
+#ifndef SIMDBITCOMPAT_H_
+#define SIMDBITCOMPAT_H_
+
+#include <iso646.h> /* mostly for Microsoft compilers */
+#include <string.h>
+
+#if SIMDCOMP_DEBUG
+# define SIMDCOMP_ALWAYS_INLINE inline
+# define SIMDCOMP_NEVER_INLINE
+# define SIMDCOMP_PURE
+#else
+# if defined(__GNUC__)
+#  if __GNUC__ >= 3
+#   define SIMDCOMP_ALWAYS_INLINE inline __attribute__((always_inline))
+#   define SIMDCOMP_NEVER_INLINE __attribute__((noinline))
+#   define SIMDCOMP_PURE __attribute__((pure))
+#  else
+#   define SIMDCOMP_ALWAYS_INLINE inline
+#   define SIMDCOMP_NEVER_INLINE
+#   define SIMDCOMP_PURE
+#  endif
+# elif defined(_MSC_VER)
+#  define SIMDCOMP_ALWAYS_INLINE __forceinline
+#  define SIMDCOMP_NEVER_INLINE
+#  define SIMDCOMP_PURE
+# else
+#  if __has_attribute(always_inline)
+#   define SIMDCOMP_ALWAYS_INLINE inline __attribute__((always_inline))
+#  else
+#   define SIMDCOMP_ALWAYS_INLINE inline
+#  endif
+#  if __has_attribute(noinline)
+#   define SIMDCOMP_NEVER_INLINE __attribute__((noinline))
+#  else
+#   define SIMDCOMP_NEVER_INLINE
+#  endif
+#  if __has_attribute(pure)
+#   define SIMDCOMP_PURE __attribute__((pure))
+#  else
+#   define SIMDCOMP_PURE
+#  endif
+# endif
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER < 1600
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+typedef signed char int8_t;
+#else
+#include <stdint.h> /* part of Visual Studio 2010 and better, others likely anyway */
+#endif
+
+#if defined(_MSC_VER)
+#define SIMDCOMP_ALIGNED(x) __declspec(align(x))
+#else
+#if defined(__GNUC__)
+#define SIMDCOMP_ALIGNED(x) __attribute__ ((aligned(x)))
+#endif
+#endif
+
+#if defined(_MSC_VER)
+# include <intrin.h>
+/* 64-bit needs extending */
+# define SIMDCOMP_CTZ(result, mask) do { \
+		unsigned long index; \
+		if (!_BitScanForward(&(index), (mask))) { \
+			(result) = 32U; \
+		} else { \
+			(result) = (uint32_t)(index); \
+		} \
+	} while (0)
+#else
+# define SIMDCOMP_CTZ(result, mask) \
+	result = __builtin_ctz(mask)
+#endif
+
+#endif /* SIMDBITCOMPAT_H_ */
+