http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50829



--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> 2012-12-01 
19:50:28 UTC ---

Created attachment 28846

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28846

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?

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