[llvm] [LV] Add support for speculative loads in loops that may fault (PR #151300)

[Alexey Bataev via llvm-commits]

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@@ -960,6 +967,8 @@ InstructionCost VPInstruction::computeCost(ElementCount VF,
         Instruction::Or, cast<VectorType>(VecTy), std::nullopt, Ctx.CostKind);
   }
   case VPInstruction::FirstActiveLane: {
+    if (VF.isScalar())
+      return InstructionCost::getInvalid();
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alexey-bataev wrote:

Separate patch with a test

https://github.com/llvm/llvm-project/pull/151300