http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50829
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> 2012-12-01 20:26:32
UTC ---
(In reply to comment #10)
> Created attachment 28846 [details]
> Use subreg
>
> Hmm, I don't understand why we use UNSPEC_CAST. I tried the attached patch to
> use a subreg instead. It passed bootstrap+testsuite and generates optimal code
> for the testcase of this PR.
>
> So, any idea what advantage the unspec has over a subreg? And if none, what is
> the best way to use a subreg?
subreg didn't work before.
