From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23499 invoked by alias); 15 Feb 2007 15:37:38 -0000 Received: (qmail 23422 invoked by uid 48); 15 Feb 2007 15:37:24 -0000 Date: Thu, 15 Feb 2007 15:37:00 -0000 Message-ID: <20070215153724.23421.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug middle-end/30807] sh postreload bug (might be generic in trunk) In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "christian dot bruel at st dot com" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2007-02/txt/msg01815.txt.bz2 ------- Comment #1 from christian dot bruel at st dot com 2007-02-15 15:37 ------- The bug might be clearer to explain like this we have 16: (set reg:r1) (const_int 188) 17: (set reg:r1) (plus (reg:r1 reg:r2) 18: (set reg:r1) (mem (plus (reg:r1) (const_int 4)) is transformed into 16: (set reg:r0) (const_int 192) 18: (set reg:r1) (mem (plus (reg:r0) (reg:r2)) since insn 18 is not reg_state[2].reg_use[i].insn, r2 might be seen as dead by another similar combine transformation on previous insns -- christian dot bruel at st dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |christian dot bruel at st | |dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30807