http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52838
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |hjl.tools at gmail dot com
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2012-04-05 00:46:13
UTC ---
(In reply to comment #2)
> The existence of (subreg/s/u:SI (reg:DI 60) 0) means that (reg:DI 60) is known
> to be a zero-extended 32-bit value, so the optimization is valid (and useful).
Can we somehow keep the knowledge that it is a zero-extended 32-bit value?
It is useful for encoding purpose.
