[Bug tree-optimization/45021] Redundant prefetches for some loops (vectorizer produced ones too)

[changpeng dot fang at amd dot com]

------- Comment #5 from changpeng dot fang at amd dot com  2010-07-28 18:28 -------
Thing is a little complicate if we change the code to:

a[i] = a[i+1] + beta * b[i];

The prefetch pass want to group a[i] and a[i+1], i.e. they have
the same base address with an offset of 4 bytes.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45021