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[Bug rtl-optimization/65932] [5 Regression] Linux-3.10.75 on arm926ej-s does not boot due to wrong code generation
- From: "wilson at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 12 Jun 2015 22:35:00 +0000
- Subject: [Bug rtl-optimization/65932] [5 Regression] Linux-3.10.75 on arm926ej-s does not boot due to wrong code generation
- Auto-submitted: auto-generated
- References: <bug-65932-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65932
Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |wilson at gcc dot gnu.org
--- Comment #11 from Jim Wilson <wilson at gcc dot gnu.org> ---
There is another testcase in 66271.
The LSR is emitted because the arm port has PROMOTE_MODE defined to make chars
and shorts unsigned when extended to int. So the problem seems to be why it
wasn't re-sign-extended before the compare. Maybe an optimization pass
incorrectly deleted that sign-extend.