http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32523
Christian Cornelssen <ccorn at cs dot tu-berlin.de> changed:
What |Removed |Added
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CC| |ccorn at cs dot
| |tu-berlin.de
--- Comment #14 from Christian Cornelssen <ccorn at cs dot tu-berlin.de>
2010-11-03 19:32:24 UTC ---
Reproduced the problem on a PowerMac G5 with 2 PPC970MP (4 cores) under MacOS X
10.4.11 (Darwin 8.11.0).
Using the attachment of the original bug report, I compared
a) Apple's version of GCC-4.0 as provied by Xcode 2.5 as /usr/bin/gcc:
powerpc-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc. build 5370)
b) GCC-4.4.5 as provided by MacPorts:
gcc-mp-4.4 (GCC) 4.4.5
simply by issuing the command
make double GCC3=gcc-4.0 GCC4=gcc-mp-4.4
Performance drop is about one third with GCC-4.4.5 instead of Apple's version
of GCC-4.0.1, but is almost restored when using -fno-schedule-insns
-fno-rerun-loop-opt with GCC-4.4.5.
