Tree-ssa status with POOMA

[Richard Guenther]

Hi!

I promised to give some updates on tree-ssa and POOMA.  Tree-ssa is
currently failing three regression tests that 3.4 succeeds in.  One
is a clear miscompilation resulting in wrong results, two look like the
same bug causing a SIGSEGV.  As usual the testcases would be incredibly
large and hard to debug, so this is mainly a heads-up (though 3.3.3 won't
be any better here).

For my real-world application I'm quite happy with tree-ssa:

-O2 -funroll-loops -ffast-math -march=athlon -fno-exceptions

		memory	compile-time	run-time	stripped static size
tree-ssa	450MB	3m57s		46s		1729680
gcc3.4		530MB	3m16s		44s		1734596

compile times are slightly in favor of 3.4, but it was compiled with a
profiledbootstrap (with a usual bootstrap I remember about 3m40s compile
time).  Runtime is also slightly in favor of 3.4, but memory usage and
binary size are really fine.  Results are identical for both 3.4 and
tree-ssa runs as far as correctness is concerned.

Richard.

--
Richard Guenther <richard dot guenther at uni-tuebingen dot de>
WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/