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[Bug target/34653] unnecessary REX prefix
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 17 Sep 2009 09:50:01 -0000
- Subject: [Bug target/34653] unnecessary REX prefix
- References: <bug-34653-5748@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from ubizjak at gmail dot com 2009-09-17 09:50 -------
(In reply to comment #1)
> and in this case the "mov %rdx,%rax" could be "mov %edx,%eax" because of the
> dominating movzbl.
32bit moves and other instructions _SIGN_EXTEND_ results to 64bits on x86_64.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34653