[llvm] Remove `NVPTXTargetLowering::LowerCONCAT_VECTORS` (PR #133145)
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Wed Mar 26 12:39:18 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-nvptx
Author: Ethan Kaji (Esan5)
<details>
<summary>Changes</summary>
>From #<!-- -->120030, `NVPTXTargetLowering::LowerCONCAT_VECTORS` is actually dead code since https://github.com/llvm/llvm-project/commit/be8dc6499ac00b2e5a608dbcec3ecb17348299e0.
This PR removes code from NVPTX, though it will still be ported to SelectionDAG.
---
Full diff: https://github.com/llvm/llvm-project/pull/133145.diff
2 Files Affected:
- (modified) llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp (-24)
- (modified) llvm/lib/Target/NVPTX/NVPTXISelLowering.h (-1)
``````````diff
diff --git a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
index 3e755c25fd91a..f6793d53967b1 100644
--- a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
@@ -2110,28 +2110,6 @@ SDValue NVPTXTargetLowering::LowerSTACKSAVE(SDValue Op,
return DAG.getMergeValues({ASC, SDValue(SS.getNode(), 1)}, DL);
}
-// By default CONCAT_VECTORS is lowered by ExpandVectorBuildThroughStack()
-// (see LegalizeDAG.cpp). This is slow and uses local memory.
-// We use extract/insert/build vector just as what LegalizeOp() does in llvm 2.5
-SDValue
-NVPTXTargetLowering::LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const {
- SDNode *Node = Op.getNode();
- SDLoc dl(Node);
- SmallVector<SDValue, 8> Ops;
- unsigned NumOperands = Node->getNumOperands();
- for (unsigned i = 0; i < NumOperands; ++i) {
- SDValue SubOp = Node->getOperand(i);
- EVT VVT = SubOp.getNode()->getValueType(0);
- EVT EltVT = VVT.getVectorElementType();
- unsigned NumSubElem = VVT.getVectorNumElements();
- for (unsigned j = 0; j < NumSubElem; ++j) {
- Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, SubOp,
- DAG.getIntPtrConstant(j, dl)));
- }
- }
- return DAG.getBuildVector(Node->getValueType(0), dl, Ops);
-}
-
SDValue NVPTXTargetLowering::LowerBITCAST(SDValue Op, SelectionDAG &DAG) const {
// Handle bitcasting from v2i8 without hitting the default promotion
// strategy which goes through stack memory.
@@ -2777,8 +2755,6 @@ NVPTXTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
return LowerINSERT_VECTOR_ELT(Op, DAG);
case ISD::VECTOR_SHUFFLE:
return LowerVECTOR_SHUFFLE(Op, DAG);
- case ISD::CONCAT_VECTORS:
- return LowerCONCAT_VECTORS(Op, DAG);
case ISD::STORE:
return LowerSTORE(Op, DAG);
case ISD::LOAD:
diff --git a/llvm/lib/Target/NVPTX/NVPTXISelLowering.h b/llvm/lib/Target/NVPTX/NVPTXISelLowering.h
index f41c569a65544..f8c17d7118bbb 100644
--- a/llvm/lib/Target/NVPTX/NVPTXISelLowering.h
+++ b/llvm/lib/Target/NVPTX/NVPTXISelLowering.h
@@ -279,7 +279,6 @@ class NVPTXTargetLowering : public TargetLowering {
SDValue LowerBITCAST(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
- SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
``````````
</details>
https://github.com/llvm/llvm-project/pull/133145
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