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[Bug inline-asm/63900] memory constrains needlessly doing memory clobber
- 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: Sun, 16 Nov 2014 19:04:53 +0000
- Subject: [Bug inline-asm/63900] memory constrains needlessly doing memory clobber
- Auto-submitted: auto-generated
- References: <bug-63900-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63900
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |NEW
Last reconfirmed| |2014-11-16
CC| |segher at gcc dot gnu.org
Resolution|INVALID |---
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Reopened; this is a perfectly valid missed optimisation.
Nothing here does a "full memory clobber"; instead, CSE simply doesn't
know how to handle a three-byte datum.