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[Qemu-devel] [PATCH 6/8] tcg: Add tcg_debug_assert


From: Richard Henderson
Subject: [Qemu-devel] [PATCH 6/8] tcg: Add tcg_debug_assert
Date: Fri, 21 Sep 2012 17:18:14 -0700

Like the C assert macro, except only enabled for CONFIG_DEBUG_TCG,
and without having to set _NDEBUG and disable all other asserts at
the same time.

The use of __builtin_unreachable (when available) gives the compiler
the same information, which may (or may not) help it optimize better.

Signed-off-by: Richard Henderson <address@hidden>
---
 tcg/tcg.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tcg/tcg.h b/tcg/tcg.h
index 48a56f0..4501c15 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -530,6 +530,15 @@ do {\
     abort();\
 } while (0)
 
+#ifdef CONFIG_DEBUG_TCG
+# define tcg_debug_assert(X) do { assert(X); } while (0)
+#elif QEMU_GNUC_PREREQ(4, 5)
+# define tcg_debug_assert(X) \
+    do { if (!(X)) { __builtin_unreachable(); } } while (0)
+#else
+# define tcg_debug_assert(X) do { (void)(X); } while (0)
+#endif
+
 void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
 
 #if TCG_TARGET_REG_BITS == 32
-- 
1.7.11.4




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