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tcg: Add tcg_debug_assert

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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 <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2012-09-21 17:18:14 -07:00 committed by Aurelien Jarno
parent 77276f6581
commit c552d6c038
1 changed files with 9 additions and 0 deletions
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9
tcg/tcg.h
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@ -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