[llvm] [PowerPC] improve P10 store forwarding on P7 scalar to vector (PR #102330)

[Chen Zheng via llvm-commits]

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@@ -11479,9 +11492,33 @@ SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
+  SDValue Val = Op.getOperand(0);
+  EVT ValVT = Val.getValueType();
+  // P10 hardware store forwarding requires that a single store contains all
+  // the data for the load. P10 is able to merge a pair of adjacent stores. Try
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chenzheng1030 wrote:

Thanks for explanation. Got it.

https://github.com/llvm/llvm-project/pull/102330