Well I tried a few different builds of xplor-nih tonight with the
following optimization flags for the gcc and g++ compilers...
testsuite in seconds
xplor python tcl
-O3 -ffastmath -mtune=970 137.5454 128.7770 48.0390
-O3 -ffastmath -mtune=970 -fno-threadsafe-statics 137.0741 127.4653 48.0205
-O3 -ffastmath -mtune=970 -finline-limit=1200 135.4462 127.5790 48.3680
As you can see the c/c++ code (mostly c++) in xplor-nih is immune to
improvement in gcc 4.2.0 with the -fno-threadsafe-statics and
-finline-limit=1200. The same build using Apple's gcc 3.3 would execute about
7% faster.
Is there anything not usually enabled in -O3 that might help? I am
rather confused by the options...
-ftree-vectorize
-fipa-cp
and the rest as to which ones are part of -O3 in gcc 4.2.0 and which require
enabling (as well as which are incompatible with each other). I would be
interested in trying to squeeze some more performance out of the gcc 4.2.0
compiles but am at a loss for the logical approach to doing this (short of
resorting to -fprofile-use).
Thanks in advance for any other advice.
Jack
