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[Bug tree-optimization/38328] Massive performance regression for jpeg_idct_islow
- From: "sgunderson at bigfoot dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Nov 2008 22:48:27 -0000
- Subject: [Bug tree-optimization/38328] Massive performance regression for jpeg_idct_islow
- References: <bug-38328-3483@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #11 from sgunderson at bigfoot dot com 2008-11-30 22:48 -------
Subject: Re: Massive performance regression
for jpeg_idct_islow
On Sun, Nov 30, 2008 at 09:29:29PM -0000, rguenth at gcc dot gnu dot org wrote:
> so it uses -mtune=i486 - this optimizes the multiplication for i486 where imul
> is slow. The difference to 4.3 is a packaging issue in Debian.
Thanks! I'll file a bug against the package.
/* Steinar */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38328