[Bug tree-optimization/42108] [4.4/4.5 Regression] 50% performance regression

[matz at gcc dot gnu dot org]

------- Comment #27 from matz at gcc dot gnu dot org  2009-12-14 05:25 -------
Created an attachment (id=19287)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19287&action=view)
three hacks

My current collection of patches and hacks for this problem.  Obviously the
"if (0)" in tree-ssa-pre.c will break pr38819 again; apart from that untested,
hence probably miscompiles everything except this testcase here :-)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42108