Revert "[NFC][ScheduleDAG] Remove unused EntrySU SUnit"
This reverts commit 0345d88de654259ae90494bf9b015416e2cccacb.
Google internal backend uses EntrySU, we are looking into removing
dependency on it.
Differential Revision: https://reviews.llvm.org/D88018
diff --git a/llvm/lib/Target/AMDGPU/GCNMinRegStrategy.cpp b/llvm/lib/Target/AMDGPU/GCNMinRegStrategy.cpp
index 417abc4..884b2e1 100644
--- a/llvm/lib/Target/AMDGPU/GCNMinRegStrategy.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNMinRegStrategy.cpp
@@ -248,6 +248,7 @@
for (auto SU : TopRoots) {
RQ.push_back(*new (Alloc.Allocate()) Candidate(SU, StepNo));
}
+ releaseSuccessors(&DAG.EntrySU, StepNo);
while (!RQ.empty()) {
LLVM_DEBUG(dbgs() << "\n=== Picking candidate, Step = " << StepNo
diff --git a/llvm/lib/Target/AMDGPU/SIMachineScheduler.h b/llvm/lib/Target/AMDGPU/SIMachineScheduler.h
index cfa6734..0a8abbb 100644
--- a/llvm/lib/Target/AMDGPU/SIMachineScheduler.h
+++ b/llvm/lib/Target/AMDGPU/SIMachineScheduler.h
@@ -455,6 +455,7 @@
MachineRegisterInfo *getMRI() { return &MRI; }
const TargetRegisterInfo *getTRI() { return TRI; }
ScheduleDAGTopologicalSort *GetTopo() { return &Topo; }
+ SUnit &getEntrySU() { return EntrySU; }
SUnit& getExitSU() { return ExitSU; }
void restoreSULinksLeft();