From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14046 invoked by alias); 9 Jun 2010 12:06:23 -0000 Received: (qmail 13629 invoked by uid 48); 9 Jun 2010 12:06:07 -0000 Date: Wed, 09 Jun 2010 12:06:00 -0000 Message-ID: <20100609120607.13628.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/44423] [4.5/4.6 Regression] Massive performance regression in SSE code due to SRA In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "martin at mpa-garching dot mpg dot de" 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: 2010-06/txt/msg01010.txt.bz2 ------- Comment #14 from martin at mpa-garching dot mpg dot de 2010-06-09 12:06 ------- SSE performance is fine again, thanks a lot! One more question, if that's OK... Depending on ARRSZ the testcase uses wildly varying amounts of CPU time; it's about half a second for ARRSZ=1024, but almost 10 seconds for ARRSZ=20 on my machine, which is extremely strange because the operation count is the same in both cases. I suspect that something weird is happening with respect to the cache and prefetching. Should I open another PR for this? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44423