[RISCV] Hoist duplicate code in lowerINSERT_SUBVECTOR. NFC

[topperc]

No description provided.

[llvmbot]

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/109733.diff

1 Files Affected:

• (modified) llvm/lib/Target/RISCV/RISCVISelLowering.cpp (+4-6)

diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index c4458b14f36ece..78d72ea6e28edb 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -10204,17 +10204,15 @@ SDValue RISCVTargetLowering::lowerINSERT_SUBVECTOR(SDValue Op,
       Vec = convertToScalableVector(ContainerVT, Vec, DAG, Subtarget);
     }
 
+    SubVec = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, ContainerVT,
+                         DAG.getUNDEF(ContainerVT), SubVec,
+                         DAG.getVectorIdxConstant(0, DL));
+
     if (OrigIdx == 0 && Vec.isUndef() && VecVT.isFixedLengthVector()) {
-      SubVec = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, ContainerVT,
-                           DAG.getUNDEF(ContainerVT), SubVec,
-                           DAG.getVectorIdxConstant(0, DL));
       SubVec = convertFromScalableVector(VecVT, SubVec, DAG, Subtarget);
       return DAG.getBitcast(Op.getValueType(), SubVec);
     }
 
-    SubVec = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, ContainerVT,
-                         DAG.getUNDEF(ContainerVT), SubVec,
-                         DAG.getVectorIdxConstant(0, DL));
     SDValue Mask =
         getDefaultVLOps(VecVT, ContainerVT, DL, DAG, Subtarget).first;
     // Set the vector length to only the number of elements we care about. Note

[michaelmaitland]

LGTM

[preames]

LGTM