Merge branch 'wip/nir-vtn' into vulkan

[mesa.git] / src / util / macros.h

diff --git a/src/util/macros.h b/src/util/macros.h
index 40ebf02da84cc86c22cbd930d29c8f07185604e4..3b708ed6aa2afc09b6cb69ee2858359e78ddbca2 100644 (file)
--- a/src/util/macros.h
+++ b/src/util/macros.h
@@ -29,6 +29,10 @@
 #  define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
 #endif
 
+/* For compatibility with Clang's __has_builtin() */
+#ifndef __has_builtin
+#  define __has_builtin(x) 0
+#endif
 
 /**
  * __builtin_expect macros
@@ -69,10 +73,34 @@ do {                        \
    assert(!str);            \
    __builtin_unreachable(); \
 } while (0)
+#elif defined (_MSC_VER)
+#define unreachable(str)    \
+do {                        \
+   assert(!str);            \
+   __assume(0);             \
+} while (0)
+#else
+#define unreachable(str) assert(!str)
 #endif
 
-#ifndef unreachable
-#define unreachable(str)
+/**
+ * Assume macro. Useful for expressing our assumptions to the compiler,
+ * typically for purposes of silencing warnings.
+ */
+#if __has_builtin(__builtin_assume)
+#define assume(expr)       \
+do {                       \
+   assert(expr);           \
+   __builtin_assume(expr); \
+} while (0)
+#elif defined HAVE___BUILTIN_UNREACHABLE
+#define assume(expr) ((expr) ? ((void) 0) \
+                             : (assert(!"assumption failed"), \
+                                __builtin_unreachable()))
+#elif defined (_MSC_VER)
+#define assume(expr) __assume(expr)
+#else
+#define assume(expr) assert(expr)
 #endif
 
 #ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
@@ -126,4 +154,35 @@ do {                        \
 #   endif
 #endif
 
+/**
+ * PUBLIC/USED macros
+ *
+ * If we build the library with gcc's -fvisibility=hidden flag, we'll
+ * use the PUBLIC macro to mark functions that are to be exported.
+ *
+ * We also need to define a USED attribute, so the optimizer doesn't
+ * inline a static function that we later use in an alias. - ajax
+ */
+#ifndef PUBLIC
+#  if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
+#    define PUBLIC __attribute__((visibility("default")))
+#    define USED __attribute__((used))
+#  elif defined(_MSC_VER)
+#    define PUBLIC __declspec(dllexport)
+#    define USED
+#  else
+#    define PUBLIC
+#    define USED
+#  endif
+#endif
+
+#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+
+/** Compute ceiling of integer quotient of A divided by B. */
+#define DIV_ROUND_UP( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+
 #endif /* UTIL_MACROS_H */