[llvm] [VectorCombine] Fix crash in scalarizeVPIntrinsic (PR #72039)

[Craig Topper via llvm-commits]

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@@ -843,6 +843,8 @@ bool VectorCombine::scalarizeVPIntrinsic(Instruction &I) {
 
   Value *ScalarOp0 = getSplatValue(Op0);
   Value *ScalarOp1 = getSplatValue(Op1);
+  if (!ScalarOp0 || !ScalarOp1)
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topperc wrote:

getSplatValue can't create new instructions, it can only return an operand of existing instructions. isSplatValue can look at shuffles and see that it splat one of the elements of its input. To get that element as a scalar you would need to insert an extractelement instruction.

https://github.com/llvm/llvm-project/pull/72039