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[Bug middle-end/77568] [7 regression] CSE/PRE/Hoisting blocks common instruction contractions
- 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: Fri, 13 Jan 2017 09:59:14 +0000
- Subject: [Bug middle-end/77568] [7 regression] CSE/PRE/Hoisting blocks common instruction contractions
- Auto-submitted: auto-generated
- References: <bug-77568-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77568
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|7.0 |8.0
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
The FMA regression would need to be solved by enhancing FMA recognition on
GIMPLE. Not sth appropriate for GCC 7 at this point (and on some
microarchitecture that would end up if-converting the thing it might be
preferable to have a single multiplication rather than two fmas due to
resource constraints).