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[Bug target/58928] Different results from gcc when -mlzcnt is used
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 17 Jan 2014 11:16:24 +0000
- Subject: [Bug target/58928] Different results from gcc when -mlzcnt is used
- Auto-submitted: auto-generated
- References: <bug-58928-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58928
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Intel(R) Xeon(R) CPU E5620 @2.40GHz
is not IvyBridge, plus even IvyBridge doesn't support lzcnt insn, only Haswell
or some recent AMD CPUs. So, this looks like user error, you shouldn't compile
code you intend to run on non-lzcnt CPUs with -mlzcnt.