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[Bug tree-optimization/18557] Inefficient code generated by -ftree-vectorize on Alpha
- From: "falk at debian dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Nov 2004 11:29:12 -0000
- Subject: [Bug tree-optimization/18557] Inefficient code generated by -ftree-vectorize on Alpha
- References: <20041118235414.18557.falk@debian.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From falk at debian dot org 2004-11-19 11:29 -------
(In reply to comment #3)
> Can we get some numbers to understand how worse we are behaving?
The code size is inflated by a factor of about 3. Run time difference depends
a lot on how many bytes are actually copied, how predictable the branches are
etc. If I just run the test case on always the same data, which is about the
best possible case, the vectorized code is 5% slower than f2.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18557