On 02/22/2012 09:08 AM, Jakub Jelinek wrote:
On Wed, Feb 22, 2012 at 08:46:19AM +0100, Roman Rakus wrote:
On 02/16/2012 05:33 PM, Jakub Jelinek wrote:
For just -O3 or -O2 -ftree-vectorize we could perhaps have some knob in
the spec files to request those extra flags, for PGO it really requires
some work from the packager (but e.g. bash/grep/awk, perhaps perl/python
etc. would definitely improve, gcc itself is already built with PGO).
What kind of work? I have tried to build bash with added -O2
-ftree-vectorize -fprofile-generate, but the build fails with many
undefined reference to `__gcov_*.
That would be probably because -lgcov isn't linked in. When using
-fprofile-generate, you need to pass that switch not just during
compilation, but also when linking the binaries (or libraries) that contain
-fprofile-generate compiled objects.
Jakub
Thanks. Anyone who wants to try/test such built bash can use my builds
which I copied to fedorapeople [1]. It was built using mock. Any
comments, test results are welcome.
[1] http://rrakus.fedorapeople.org/bash-PGO/
RR
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