From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29416 invoked by alias); 23 Jun 2005 15:11:56 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 29399 invoked by uid 48); 23 Jun 2005 15:11:52 -0000 Date: Thu, 23 Jun 2005 15:11:00 -0000 Message-ID: <20050623151152.29397.qmail@sourceware.org> From: "mmitchel at gcc dot gnu dot org" To: gcc-bugs@gcc.gnu.org In-Reply-To: <20050610135925.22000.rpedersen@atmel.com> References: <20050610135925.22000.rpedersen@atmel.com> Reply-To: gcc-bugzilla@gcc.gnu.org Subject: [Bug tree-optimization/22000] [4.0/4.1 Regression] Read from volatile member of struct is optimized away X-Bugzilla-Reason: CC X-SW-Source: 2005-06/txt/msg02935.txt.bz2 List-Id: ------- Additional Comments From mmitchel at gcc dot gnu dot org 2005-06-23 15:11 ------- I somewhat suspect this hunk of code in c-typeck.c:build_component_ref: if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (subdatum)) TREE_THIS_VOLATILE (ref) = 1; I don't see anything that sets TREE_SIDE_EFFECTS. However, from tree.h: If this bit is set in an expression, so is TREE_SIDE_EFFECTS. */ #define TREE_THIS_VOLATILE(NODE) ((NODE)->common.volatile_flag) However, I'm having a hard time getting good connectivity back to my build machine to experiment with this. Joseph, any ideas about this? -- What |Removed |Added ---------------------------------------------------------------------------- CC| |joseph at codesourcery dot | |com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22000