[RISCV] Use CONCAT_VECTORS instead of INSERT_SUBVECTOR. NFC.

[tclin914]

No description provided.

[llvmbot]

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

Author: Jim Lin (tclin914)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/164226.diff

1 Files Affected:

• (modified) llvm/lib/Target/RISCV/RISCVISelLowering.cpp (+1-4)

diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index eb875583ffca4..022d0268f8736 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -12649,10 +12649,7 @@ SDValue RISCVTargetLowering::lowerVECTOR_REVERSE(SDValue Op,
       Lo = DAG.getNode(ISD::VECTOR_REVERSE, DL, LoVT, Lo);
       Hi = DAG.getNode(ISD::VECTOR_REVERSE, DL, HiVT, Hi);
       // Reassemble the low and high pieces reversed.
-      // FIXME: This is a CONCAT_VECTORS.
-      SDValue Res = DAG.getInsertSubvector(DL, DAG.getUNDEF(VecVT), Hi, 0);
-      return DAG.getInsertSubvector(DL, Res, Lo,
-                                    LoVT.getVectorMinNumElements());
+      return DAG.getNode(ISD::CONCAT_VECTORS, DL, VecVT, Hi, Lo);
     }
 
     // Just promote the int type to i16 which will double the LMUL.

[topperc]

LGTM