[Mesa-dev] [PATCH 1/2] gallium: define unreachable macro

[Tobias Klausmann]

This is done the same way for glsl et al. already

Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann at mni.thm.de>
---
 src/gallium/include/pipe/p_compiler.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/gallium/include/pipe/p_compiler.h b/src/gallium/include/pipe/p_compiler.h
index fb018bf..62ba9d3 100644
--- a/src/gallium/include/pipe/p_compiler.h
+++ b/src/gallium/include/pipe/p_compiler.h
@@ -249,6 +249,29 @@ void _ReadWriteBarrier(void);
 
 
 /**
+ * Unreachable macro. Useful for suppressing "control reaches end of non-void
+ * function" warnings.
+ */
+#ifdef HAVE___BUILTIN_UNREACHABLE
+#define unreachable(str)    \
+do {                        \
+   assert(!str);            \
+   __builtin_unreachable(); \
+} while (0)
+#elif _MSC_VER >= 1200
+#define unreachable(str)    \
+do {                        \
+   assert(!str);            \
+   __assume(0);             \
+} while (0)
+#endif
+
+#ifndef unreachable
+#define unreachable(str) assert(!str)
+#endif
+
+
+/**
  * Static (compile-time) assertion.
  * Basically, use COND to dimension an array.  If COND is false/zero the
  * array size will be -1 and we'll get a compilation error.
-- 
2.2.2