[Bug regression/33928] [4.3 Regression] 22% performance slowdown from 4.2.2 to 4.3.0 in floating-point code
lucier at math dot purdue dot edu
gcc-bugzilla@gcc.gnu.org
Wed Jan 9 19:21:00 GMT 2008
------- Comment #21 from lucier at math dot purdue dot edu 2008-01-09 18:44 -------
The assembler is identical to that in the third attachment and the time is
basically the same (other things were going on at the same time):
(time (direct-fft-recursive-4 a table))
465 ms real time
466 ms cpu time (466 user, 0 system)
no collections
64 bytes allocated
no minor faults
no major faults
euler-86% /pkgs/gcc-mainline/bin/gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../../mainline/configure --prefix=/pkgs/gcc-mainline
--enable-languages=c --enable-checking=release --with-gmp=/pkgs/gmp-4.2.2
--with-mpfr=/pkgs/gmp-4.2.2 --enable-gather-detailed-mem-stats
Thread model: posix
gcc version 4.3.0 20080109 (experimental) [trunk revision 131427] (GCC)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928
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