From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25131 invoked by alias); 8 Oct 2005 05:51:38 -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 25106 invoked by uid 48); 8 Oct 2005 05:51:37 -0000 Date: Sat, 08 Oct 2005 05:51:00 -0000 Message-ID: <20051008055137.25105.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug rtl-optimization/13931] [3.4/4.0/4.1 Regression] combiner much slower on big basic blocks In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "ian at airs dot com" X-SW-Source: 2005-10/txt/msg00975.txt.bz2 List-Id: ------- Comment #34 from ian at airs dot com 2005-10-08 05:51 ------- I am able to recreate the problem with a hppa64-hp-hpux11 cross-compiler, in the sense that combine does lose the REG_DEAD note when compiling the gcc.c-torture/compile/920501-13.c test case with -O1. In the current compiler, the compilation succeeds. A REG_UNUSED note is added by the recompute_reg_usage pass, the unused register is allocated, and the allocated register is later eliminated during the combine_stack_adjustments pass. So it works but the overall effect is not ideal since we allocate an unneccessary register. I'll see if we can avoid losing the REG_DEAD note in the combine pass. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13931