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[Bug target/80570] auto-vectorizing int->double conversion should use half-width memory operands to avoid shuffles, instead of load+extract
- 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: Tue, 02 May 2017 08:35:03 +0000
- Subject: [Bug target/80570] auto-vectorizing int->double conversion should use half-width memory operands to avoid shuffles, instead of load+extract
- Auto-submitted: auto-generated
- References: <bug-80570-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80570
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-05-02
Blocks| |53947
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. The vectorizer doesn't have the ability to avoid unpacking /
packing
by using half-width vectors when it feeds packing/unpacking conversions.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations