[Bug middle-end/36099] [4.4 Regression] early loop unrolling pass prevents vectorization, SLP doesn't do its job

[victork at gcc dot gnu dot org]

------- Comment #6 from victork at gcc dot gnu dot org  2008-07-29 22:56 -------
I had a closer look into testcase in original bug report and it appears that
vectorizer fails on attempt to vectorize __builtin_cexpi ().

Regarding different behavior of vectorizer with -m32 and -m64 described in
comment #5. It appears that with -m32, the internal loop is not unrolled, and
thus is vectorized later. While with -m64 the internal loop gets completely
unrolled, so there is no chance to vectorize it later.


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victork at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |victork at gcc dot gnu dot
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36099