[llvm] [AMDGPU] Optimize LDS DMA soft waitcnt (PR #138802)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp llvm/lib/Target/AMDGPU/SIInstrInfo.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index 3e0cf5f35..7852c650a 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -1279,9 +1279,10 @@ bool WaitcntGeneratorPreGFX12::applyPreexistingWaitcnt(
       unsigned IEnc = II.getOperand(0).getImm();
       AMDGPU::Waitcnt OldWait = AMDGPU::decodeWaitcnt(IV, IEnc);
 
-      // These pseudo waitcnt instructions are only needed to synchronize DS operations
-      // with direct LDS loads that use vmcnt. We can safely relax them when no
-      // outstanding direct LDS loads exist, even if other vmcnt events are pending.
+      // These pseudo waitcnt instructions are only needed to synchronize DS
+      // operations with direct LDS loads that use vmcnt. We can safely relax
+      // them when no outstanding direct LDS loads exist, even if other vmcnt
+      // events are pending.
       if (II.getOpcode() == AMDGPU::S_WAITCNT_VMCNT_LDS_DMA_soft) {
         unsigned RegNo = SQ_MAX_PGM_VGPRS + EXTRA_VGPR_LDS;
         AMDGPU::Waitcnt LDSDMAWait;
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.h b/llvm/lib/Target/AMDGPU/SIInstrInfo.h
index 8f32c5223..3980cc9c9 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.h
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.h
@@ -1010,7 +1010,7 @@ public:
   static unsigned getNonSoftWaitcntOpcode(unsigned Opcode) {
     switch (Opcode) {
     case AMDGPU::S_WAITCNT_soft:
-    case AMDGPU:: S_WAITCNT_VMCNT_LDS_DMA_soft:
+    case AMDGPU::S_WAITCNT_VMCNT_LDS_DMA_soft:
       return AMDGPU::S_WAITCNT;
     case AMDGPU::S_WAITCNT_VSCNT_soft:
       return AMDGPU::S_WAITCNT_VSCNT;

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https://github.com/llvm/llvm-project/pull/138802