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2017 Oct 17
3
Possible bug of Alias Analysis?
Hi,
I am an out-of-tree user of llvm. I am running into an regression issue against llvm 5.0.
The issue was introduced by "[BasicAA] Use MayAlias instead of PartialAlias for fallback."( https://reviews.llvm.org/D34318)
I have attached a very simple program to reproduce the issue. The symptom is alias analysis report NoAlias to GVN which cause GVN do wrong optimization.
The BasicAA reports MayAlias while TBAA reports NoAlias, when query the pointers of below two instructions in attached sample:
%5 = load float, f...
2017 Oct 18
2
Possible bug of Alias Analysis?
...iling.song at intel.com>:
> > Hi,
> >
> > I am an out-of-tree user of llvm. I am running into an regression issue against
> llvm 5.0.
> > The issue was introduced by "[BasicAA] Use MayAlias instead of PartialAlias for
> fallback."( https://reviews.llvm.org/D34318)
> > I have attached a very simple program to reproduce the issue. The symptom is
> alias analysis report NoAlias to GVN which cause GVN do wrong optimization.
> > The BasicAA reports MayAlias while TBAA reports NoAlias, when query the
> pointers of below two instructions in attac...
2017 Oct 18
2
Possible bug of Alias Analysis?
...; >
> >> > I am an out-of-tree user of llvm. I am running into an regression issue
> against
> >> llvm 5.0.
> >> > The issue was introduced by "[BasicAA] Use MayAlias instead of PartialAlias
> for
> >> fallback."( https://reviews.llvm.org/D34318)
> >> > I have attached a very simple program to reproduce the issue. The
> symptom is
> >> alias analysis report NoAlias to GVN which cause GVN do wrong optimization.
> >> > The BasicAA reports MayAlias while TBAA reports NoAlias, when query the
> >> po...