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[Bug tree-optimization/79014] Absent vectorization with memory loads
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 09 Jan 2017 08:43:54 +0000
- Subject: [Bug tree-optimization/79014] Absent vectorization with memory loads
- Auto-submitted: auto-generated
- References: <bug-79014-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79014
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-01-09
Blocks| |53947
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is that GCC does not recognize s3[R[z] & mask] as valid gather
instruction (it does not understand the bitwise and doing scalar evolution
analysis for a start which it does to do dependence analysis).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations