[Bug target/30778] [4.3 Regression] invalid code generation for memset() with -mtune=k8

[hubicka at gcc dot gnu dot org]

------- Comment #4 from hubicka at gcc dot gnu dot org  2007-02-24 23:09 -------
Hi,
testing for expected_size is wrong here - with profile feedback, expected_size
is average size of the block and thus can be smaller than actual size of the
block being copied.
In general we should in this case end up using move_by_pieces so we won't
produce the loop anyway, but still there should be loop header test emitted, I
am just looking on why it is skipped.

Honza


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30778