[llvm] [VPlan] Add support for VPWidenIntOrFpInductionRecipe in predicated D… (PR #115274)

[Shih-Po Hung via llvm-commits]

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@@ -1191,6 +1191,16 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
     return getCmpSelInstrCost(Instruction::Select, ICA.getReturnType(),
                               ICA.getArgTypes()[0], CmpInst::BAD_ICMP_PREDICATE,
                               CostKind);
+  case Intrinsic::experimental_vp_splat: {
+    auto LT = getTypeLegalizationCost(RetTy);
+    if (RetTy->getScalarSizeInBits() == 1) {
+      return LT.first *
+             (1 + getRISCVInstructionCost({RISCV::VMV_V_X, RISCV::VMSNE_VI},
+                                          LT.second, CostKind));
+    }
+    return LT.first *
+           getRISCVInstructionCost(RISCV::VMV_V_X, LT.second, CostKind);
+  }
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arcbbb wrote:

These changes are included to prevent invalid costs in the tests, and will be moved to a separate patch for backend.

https://github.com/llvm/llvm-project/pull/115274