[llvm] [AMDGPU] Support divergent sized dynamic alloca (PR #121148)

[via llvm-commits]

================
@@ -4017,29 +4017,26 @@ SDValue SITargetLowering::LowerCall(CallLoweringInfo &CLI,
 }
 
 // This is similar to the default implementation in ExpandDYNAMIC_STACKALLOC,
-// except for stack growth direction(default: downwards, AMDGPU: upwards) and
-// applying the wave size scale to the increment amount.
-SDValue SITargetLowering::lowerDYNAMIC_STACKALLOCImpl(SDValue Op,
-                                                      SelectionDAG &DAG) const {
+// except for:
+// 1. Stack growth direction(default: downwards, AMDGPU: upwards), and
+// 2. Scale size where, scale = wave-reduction(alloca-size) * wave-size
+SDValue SITargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
+                                                  SelectionDAG &DAG) const {
   const MachineFunction &MF = DAG.getMachineFunction();
   const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
 
   SDLoc dl(Op);
   EVT VT = Op.getValueType();
-  SDValue Tmp1 = Op;
-  SDValue Tmp2 = Op.getValue(1);
-  SDValue Tmp3 = Op.getOperand(2);
-  SDValue Chain = Tmp1.getOperand(0);
-
+  SDValue Chain = Op.getOperand(0);
   Register SPReg = Info->getStackPtrOffsetReg();
 
   // Chain the dynamic stack allocation so that it doesn't modify the stack
   // pointer when other instructions are using the stack.
   Chain = DAG.getCALLSEQ_START(Chain, 0, 0, dl);
 
-  SDValue Size = Tmp2.getOperand(1);
+  SDValue Size = Op.getValue(1).getOperand(1);
----------------
easyonaadit wrote:

Done done.

https://github.com/llvm/llvm-project/pull/121148