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3 Commits

Author SHA1 Message Date
Matt Arsenault
f0a88dbaab LoadStoreVectorizer: Split even sized illegal chains properly 
Implement isLegalToVectorizeLoadChain for AMDGPU to avoid
producing private address spaces accesses that will need to be
split up later. This was doing the wrong thing in the case
where the queried chain was an even number of elements.

A possible <4 x i32> store was being split into
store <2 x i32>
store i32
store i32

rather than
store <2 x i32>
store <2 x i32>

when legal.

llvm-svn: 295933
 2017-02-23 03:58:53 +00:00
Tom Stellard
64a9d0876c AMDGPU/SI: Don't allow unaligned scratch access 
Summary: The hardware doesn't support this.

Reviewers: arsenm

Subscribers: kzhuravl, wdng, nhaehnle, yaxunl, llvm-commits, tony-tye

Differential Revision: https://reviews.llvm.org/D25523

llvm-svn: 284257
 2016-10-14 18:10:39 +00:00
Matt Arsenault
950a82047b LSV: Fix incorrectly increasing alignment 
If the unaligned access has a dynamic offset, it may be odd which
would make the adjusted alignment incorrect to use.

llvm-svn: 281110
 2016-09-09 22:20:14 +00:00