tree fd25b991bc0e91cdd9b76c41be0686ef9c2382c2
parent 5c48ac9139026b4512c79af8059bf2ec40e5fa99
author Piotr Sobczak <piotr.sobczak@amd.com> 1555654754 +0000
committer Piotr Sobczak <piotr.sobczak@amd.com> 1555654754 +0000

[AMDGPU] Ignore non-SUnits edges

Summary:
Ignore edges to non-SUnits (e.g. ExitSU) when checking
for low latency instructions.

When calling the function isLowLatencyInstruction(),
an ExitSU could be on the list of successors, not necessarily
a regular SU. In other places in the code there is a check
"Succ->NodeNum >= DAGSize" to prevent further processing of
ExitSU as "Succ->getInstr()" is NULL in such a case.
Also, 8 out of 9 cases of "SUnit *Succ = SuccDep.getSUnit())"
has the guard, so it is clearly an omission here.

Change-Id: Ica86f0327c7b2e6bcb56958e804ea6c71084663b

Reviewers: nhaehnle

Reviewed By: nhaehnle

Subscribers: MatzeB, arsenm, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60864

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358740 91177308-0d34-0410-b5e6-96231b3b80d8