[llvm] [AMDGPU] Cluster export instruction in PostRA Scheduler (PR #141399)

[Carl Ritson via llvm-commits]

https://github.com/perlfu created https://github.com/llvm/llvm-project/pull/141399

DAG mutation needs to be applied post-RA to maintain order established during pre-RA scheduler.

>From 35b663ea71e9c17c049ac54717aae929d4089282 Mon Sep 17 00:00:00 2001
From: Carl Ritson <carl.ritson at amd.com>
Date: Sun, 25 May 2025 16:52:49 +0900
Subject: [PATCH] [AMDGPU] Cluster export instruction in PostRA Scheduler

DAG mutation needs to be applied post-RA to maintain order
established during pre-RA scheduler.
---
 llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index e24d8481408ad..7479703ce353a 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -1129,6 +1129,7 @@ GCNTargetMachine::createPostMachineScheduler(MachineSchedContext *C) const {
        getOptLevel() >= CodeGenOptLevel::Less) &&
       EnableVOPD)
     DAG->addMutation(createVOPDPairingMutation());
+  DAG->addMutation(createAMDGPUExportClusteringDAGMutation());
   return DAG;
 }
 //===----------------------------------------------------------------------===//