[Bug rtl-optimization/40772] generating rendundant moves from second byte of 32b/64b register

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-07-17 09:54 -------
The zero extension is done to avoid partial register stalls.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40772