Little C-benchmarks of gcc-2.95.4-ss,gcc-3.3.4-ss,gcc-3.4.1-ss & gcc-3.5.0-ss.

[jc-nospam@jr-pizarro.jazztel.es]

* > > * CFLAGS_only_for_gcc35="$CFLAGS -ftree-ccp -ftree-pre -ftree-dce
* > > -ftree-dse \ -ftree-lrs -ftree-combine-temps -ftree-ter -ftree-copyrename
* > > \
* > > -ftree-dominator-opts -ftree-ch -ftree-sra"
* >
* > Aren't those enabled by default?
* 
* At -O2 they all are enabled by default.
* 
I'm not sure, but i forced this options of tree-SSA from Novillo's GCC-3.5.

* To the best of (at least) my knowledge, the SSA optimizations are
* not slow.  You can see what component of the compiler takes too 
* much compile time by looking at the output of -ftime-report (and
* file bugs when an SSA optimizer eats up more than, say, 10% of the
* total compile time).
* 
* Did you build the 3.5 snapshot with --disable-checking?
* 
Yes, i'd built the 4 GCCs with the configure's option --disable-checking,
--disable-shared and --disable-threads.

I've time to test -ftime-report :(, i only wanted little benchmarks xD.