[Bug tree-optimization/36439] [4.3 Regression] very long compile-time in PRE building gimp-plugin-registry

[kurt at garloff dot de]

------- Comment #11 from kurt at garloff dot de  2010-03-19 00:34 -------
(In reply to comment #10)
> GCC 4.3.4 is being released, adjusting target milestone.

Very non-scientific benchmark:
Did compile latest gmic-1.3.4.0 on a 2xL5540 system (plenty of RAM) with make
-j8 and compile flags: 
-O3 --param max-inline-insns-auto=200 -ffast-math -funroll-loops
-ftree-vectorize
Times (in seconds, user, elapsed):
4.3.5:             1263u, 377e
 w/ -fno-tree-pre:  755u, 202e
4.4.4:             1022u, 311e
 w/ -fno-tree-pre:  996u, 284e
4.5.0:             2325u, 615e
 w/ -fno-tree-pre: 1974u, 543e

Note that this is in contrast to earlier observations that 4.4/4.5 did do much
better than 4.3. Don't know whether that's caused by changed gmic code or
whether we have regressed in 4.5. Let me know if you want me to pick one file
that takes particularly long to compile and investigate further.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36439