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[Bug middle-end/39046] gcc 4.4.0 20090116 loop unrolling causes unaccountable performance degradation
- From: "blu dot dark at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 31 Jan 2009 03:23:51 -0000
- Subject: [Bug middle-end/39046] gcc 4.4.0 20090116 loop unrolling causes unaccountable performance degradation
- References: <bug-39046-17251@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from blu dot dark at gmail dot com 2009-01-31 03:23 -------
Result unreproducible under the same compiler version and same compile options
on a OSX 10.5.6 core2duo host. Both 'flat_assignment_ai' and
'loop_assignment_ai' versions generate identical code.
$ i386-apple-darwin9.6.0-gcc-4.4.0 -v
Using built-in specs.
Target: i386-apple-darwin9.6.0
Configured with: ../gcc-4.4-20090116/configure --prefix=/opt/local
--enable-languages=c,c++,objc,obj-c++ --libdir=/opt/local/lib/gcc44
--includedir=/opt/local/include/gcc44 --infodir=/opt/local/share/info
--mandir=/opt/local/share/man --with-local-prefix=/opt/local --with-system-zlib
--disable-nls --program-suffix=-mp-4.4
--with-gxx-include-dir=/opt/local/include/gcc44/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local
Thread model: posix
gcc version 4.4.0 20090116 (experimental) (GCC)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39046