https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80198
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-03-27
CC| |amker at gcc dot gnu.org,
| |law at gcc dot gnu.org
Blocks| |53947, 65917
Target Milestone|--- |6.4
Ever confirmed|0 |1
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Another fallout of that questionable change...
Note it's true that the vectorizer doesn't special-case zero dependence
distance when doing runtime checking for aliasing, that's a missed feature.
Not sure
if we can cheaply add that case. If we know the difference we are looking at
is >= 0 we can bias by -1 (unsigned).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65917
[Bug 65917] [6 Regression] XFAIL: gcc.dg/tree-ssa/20030922-2.c
scan-tree-dump-times dom1 "if " 2
