[Bug tree-optimization/20643] [4.0/4.1/4.2 Regression] Tree loop optimizer does worse job than RTL loop optimizer

[rguenth at gcc dot gnu dot org]

------- Comment #9 from rguenth at gcc dot gnu dot org  2006-04-28 14:06 -------
This is really because we do not decompose structs pointed to by parameters for
their elements, so a write to an int clobbers all of plan7_s.

With -O2 timings on i686 are for me (averages of three runs)

3.4.6    5.4s
4.0.3    7.4s
4.1.0    6.1s
4.2.0    6.6s

manually PREing gives 5.2s for mainline.


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rguenth at gcc dot gnu dot org changed:

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20643