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[Bug rtl-optimization/64304] AArch64 miscompilation with -mgeneral-regs-only
- From: "jiwang at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 06 Jan 2015 18:23:05 +0000
- Subject: [Bug rtl-optimization/64304] AArch64 miscompilation with -mgeneral-regs-only
- Auto-submitted: auto-generated
- References: <bug-64304-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64304
Jiong Wang <jiwang at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-01-06
Ever confirmed|0 |1
--- Comment #2 from Jiong Wang <jiwang at gcc dot gnu.org> ---
a quick looks shows it's related with SHIFT_COUNT_TRUNCATED.
looks like generic code, especially combine pass, is with wrong usage of
SHIFT_COUNT_TRUNCATED in some situations.