From 768e6faba8fa5eef04276a51836a40c5ab8013bc Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad@amd.com>
Date: Wed, 16 Feb 2022 16:41:45 +0000
Subject: [PATCH] [AMDGPU] Return better Changed status from SILowerControlFlow

Differential Revision: https://reviews.llvm.org/D120025
---
 llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp b/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
index e1018bd..4bb05d9 100644
--- a/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
+++ b/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
@@ -865,6 +865,7 @@ bool SILowerControlFlow::runOnMachineFunction(MachineFunction &MF) {
     }
   }
 
+  bool Changed = false;
   MachineFunction::iterator NextBB;
   for (MachineFunction::iterator BI = MF.begin();
        BI != MF.end(); BI = NextBB) {
@@ -886,6 +887,7 @@ bool SILowerControlFlow::runOnMachineFunction(MachineFunction &MF) {
       case AMDGPU::SI_LOOP:
       case AMDGPU::SI_END_CF:
         SplitMBB = process(MI);
+        Changed = true;
         break;
 
       // FIXME: find a better place for this
@@ -894,6 +896,7 @@ bool SILowerControlFlow::runOnMachineFunction(MachineFunction &MF) {
         lowerInitExec(MBB, MI);
         if (LIS)
           LIS->removeAllRegUnitsForPhysReg(AMDGPU::EXEC);
+        Changed = true;
         break;
 
       default:
@@ -913,5 +916,5 @@ bool SILowerControlFlow::runOnMachineFunction(MachineFunction &MF) {
   LoweredIf.clear();
   KillBlocks.clear();
 
-  return true;
+  return Changed;
 }
-- 
2.7.4