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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
- Re: [Qemu-devel] [PATCH 1/8] tcg: Adjust descriptions of *cond opcodes, (continued)
- [Qemu-devel] [PATCH 2/8] tcg: Emit ANDI as EXTU for appropriate constants, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 3/8] tcg: Optimize initial inputs for ori_i64, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 4/8] tcg: Emit XORI as NOT for appropriate constants, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 5/8] tcg: Implement concat*_i64 with deposit_i64, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 6/8] tcg: Add tcg_debug_assert,
Richard Henderson <=
- [Qemu-devel] [PATCH 7/8] tcg: Sanity check deposit inputs, Richard Henderson, 2012/09/21
- [Qemu-devel] [PATCH 8/8] tcg: Sanity check goto_tb input, Richard Henderson, 2012/09/21
- Re: [Qemu-devel] [PATCH 0/8] Misc tcg improvements, Aurelien Jarno, 2012/09/25