[Bug rtl-optimization/45434] x86 missed optimization: use high register (ah, bh, ch, dh) when available to make comparisons

[hjl dot tools at gmail dot com]

------- Comment #3 from hjl dot tools at gmail dot com  2010-08-29 18:34 -------
Combine seems to prefer LSHIFTRT over ZERO_EXTRACT.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45434