From 791ea00d98aa5532307375f0f292b5cce9365bb7 Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad@amd.com>
Date: Tue, 1 Oct 2024 11:56:18 +0100
Subject: [PATCH] [AMDGPU] Remember to clear a DenseMap between runs of
 SIInsertWaitcnts

This caused nondeterministic codegen in some cases.
---
 llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index 80a7529002ac9..b2cfc3f317256 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -2598,6 +2598,7 @@ bool SIInsertWaitcnts::runOnMachineFunction(MachineFunction &MF) {
     Modified = true;
   }
   ReleaseVGPRInsts.clear();
+  PreheadersToFlush.clear();
   SLoadAddresses.clear();
 
   return Modified;