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[Bug rtl-optimization/66706] Redundant bitmask instruction on x >> (n & 32)
- From: "segher at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 30 Jun 2015 16:20:11 +0000
- Subject: [Bug rtl-optimization/66706] Redundant bitmask instruction on x >> (n & 32)
- Auto-submitted: auto-generated
- References: <bug-66706-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66706
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-06-30
Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
For some reason when combining the zero_extend with the lshiftrt,
combine writes it as the equivalent and-of-subreg. Which doesn't
match any existing backend pattern.
Confirmed; mine.