[Clang][Codegen] fix vector data by modifying VMVN

[Zhenhang1213]

No description provided.

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[llvmbot]

@llvm/pr-subscribers-backend-arm

Author: Austin (Zhenhang1213)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/105913.diff

1 Files Affected:

• (modified) llvm/lib/Target/ARM/ARMISelLowering.cpp (+1-1)

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 1e8bb8a495e68b..96e4cbb26a5a7b 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -7976,7 +7976,7 @@ SDValue ARMTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
           VT, ST->hasMVEIntegerOps() ? MVEVMVNModImm : VMVNModImm);
       if (Val.getNode()) {
         SDValue Vmov = DAG.getNode(ARMISD::VMVNIMM, dl, VmovVT, Val);
-        return DAG.getNode(ISD::BITCAST, dl, VT, Vmov);
+        return DAG.getNode(ARMISD::VECTOR_REG_CAST, dl, VT, Vmov);
       }
 
       // Use vmov.f32 to materialize other v2f32 and v4f32 splats.

[davemgreen]

I think I would fold this into #105519. If this is not affecting any tests then the might not be any big endian test coverage for them at the moment. I've added a few extra tests in 9f82f6d

[Zhenhang1213]

I think I would fold this into #105519. If this is not affecting any tests then the might not be any big endian test coverage for them at the moment. I've added a few extra tests in 9f82f6d

I rebased it and modified the failed tests, this pr is just a reference, and I've collapsed it into #105519