[PATCH] D62614: Fix for the OCL/LC to failure on some OCLPerf tests

Fri May 31 03:26:40 PDT 2019

alex-t added a comment.

In D62614#1524597 <https://reviews.llvm.org/D62614#1524597>, @nhaehnle wrote:

> See D60834 <https://reviews.llvm.org/D60834> for what I think is the right direction to fix this.

Once again:

LCSSA is not sufficient for the following reason:
Since definition is considered uniform it is selected to SALU and produces SGPR.
The value in this SGPR is correct for all laves leave in loop body.
LCSSA PHI node that inserted in loop exit block will turn into the copy from SGPR to VGPR – this is incorrect.

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62614/new/

https://reviews.llvm.org/D62614