From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:60324) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TFDQU-0004dd-VE for qemu-devel@nongnu.org; Fri, 21 Sep 2012 20:18:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TFDQU-00016W-0t for qemu-devel@nongnu.org; Fri, 21 Sep 2012 20:18:30 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:62643) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TFDQT-00015R-Qs for qemu-devel@nongnu.org; Fri, 21 Sep 2012 20:18:29 -0400 Received: by mail-pa0-f45.google.com with SMTP id fb10so598759pad.4 for ; Fri, 21 Sep 2012 17:18:29 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Fri, 21 Sep 2012 17:18:14 -0700 Message-Id: <1348273096-1495-7-git-send-email-rth@twiddle.net> In-Reply-To: <1348273096-1495-1-git-send-email-rth@twiddle.net> References: <1348273096-1495-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 6/8] tcg: Add tcg_debug_assert List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aurelien@aurel32.net 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 --- 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