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[Bug rtl-optimization/50088] movzbl is generated instead of movl
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 15 Aug 2011 14:47:51 +0000
- Subject: [Bug rtl-optimization/50088] movzbl is generated instead of movl
- Auto-submitted: auto-generated
- References: <bug-50088-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50088
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> 2011-08-15 14:47:51 UTC ---
It is done on purpose:
/* X86_TUNE_MOVX: Enable to zero extend integer registers to avoid
partial dependencies. */
m_PPRO | m_P4_NOCONA | m_CORE2I7 | m_ATOM | m_GEODE | m_AMD_MULTIPLE |
m_GENERIC,
You can remove m_ATOM to see its performance impact with -mtune=atom
on Atom.