[llvm] [AMDGPU] Support image atomic no return instructions (PR #150742)

[Matt Arsenault via llvm-commits]

================
@@ -9149,16 +9149,25 @@ SDValue SITargetLowering::lowerImage(SDValue Op,
   SDLoc DL(Op);
   MachineFunction &MF = DAG.getMachineFunction();
   const GCNSubtarget *ST = &MF.getSubtarget<GCNSubtarget>();
+  unsigned IntrOpcode = Intr->BaseOpcode;
+  // For image atomic: use no-return opcode if result is unused.
+  if (Intr->AtomicNoRetBaseOpcode != Intr->BaseOpcode &&
+      !Op.getNode()->hasAnyUseOfValue(0))
+    IntrOpcode = Intr->AtomicNoRetBaseOpcode;
   const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
-      AMDGPU::getMIMGBaseOpcodeInfo(Intr->BaseOpcode);
+      AMDGPU::getMIMGBaseOpcodeInfo(IntrOpcode);
   const AMDGPU::MIMGDimInfo *DimInfo = AMDGPU::getMIMGDimInfo(Intr->Dim);
-  unsigned IntrOpcode = Intr->BaseOpcode;
   bool IsGFX10Plus = AMDGPU::isGFX10Plus(*Subtarget);
   bool IsGFX11Plus = AMDGPU::isGFX11Plus(*Subtarget);
   bool IsGFX12Plus = AMDGPU::isGFX12Plus(*Subtarget);
 
-  SmallVector<EVT, 3> ResultTypes(Op->values());
   SmallVector<EVT, 3> OrigResultTypes(Op->values());
+  SmallVector<EVT, 3> ResultTypes;
+  if (BaseOpcode->NoReturn && BaseOpcode->Atomic)
+    ResultTypes.push_back(MVT::Other);
+  else
+    ResultTypes = OrigResultTypes;
----------------
arsenm wrote:

Can you initialize from ternary operator 

https://github.com/llvm/llvm-project/pull/150742