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[Bug rtl-optimization/69904] [6 Regression] shrink-wrapping creates weird atomic compare exchange loop on arm
- 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, 23 Feb 2016 00:24:57 +0000
- Subject: [Bug rtl-optimization/69904] [6 Regression] shrink-wrapping creates weird atomic compare exchange loop on arm
- Auto-submitted: auto-generated
- References: <bug-69904-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69904
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-02-23
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Not allowing the prologue to be moved over clobber-mem-scratch would
pessimize quite a lot of code I think. Here, the problem is that you
really cannot allow any store machine insn inside the loop. Maybe the
loop should be just one RTL insn?
Confirmed btw.