[llvm] b9567bc - [RISCV] Use SelectionDAG::getVScale in lowerVPReverseExperimental. NFCI (#81694)

[via llvm-commits]

Author: Luke Lau
Date: 2024-02-14T12:30:29+08:00
New Revision: b9567bc78f42a6850ddf3b3cf3f9a0d2cc08ffff

URL: https://github.com/llvm/llvm-project/commit/b9567bc78f42a6850ddf3b3cf3f9a0d2cc08ffff
DIFF: https://github.com/llvm/llvm-project/commit/b9567bc78f42a6850ddf3b3cf3f9a0d2cc08ffff.diff

LOG: [RISCV] Use SelectionDAG::getVScale in lowerVPReverseExperimental. NFCI (#81694)

Use a slightly more idiomatic way of getting vscale. getVScale
performs additional constant folding, but I presume computeKnownBits
also catches these cases too.

Added: 
    

Modified: 
    llvm/lib/Target/RISCV/RISCVISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 73492c28815b1d..4caadef694d725 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -11106,8 +11106,8 @@ RISCVTargetLowering::lowerVPReverseExperimental(SDValue Op,
       // Slide off any elements from past EVL that were reversed into the low
       // elements.
       unsigned MinElts = GatherVT.getVectorMinNumElements();
-      SDValue VLMax = DAG.getNode(ISD::VSCALE, DL, XLenVT,
-                                  DAG.getConstant(MinElts, DL, XLenVT));
+      SDValue VLMax =
+          DAG.getVScale(DL, XLenVT, APInt(XLenVT.getSizeInBits(), MinElts));
       SDValue Diff = DAG.getNode(ISD::SUB, DL, XLenVT, VLMax, EVL);
 
       Result = getVSlidedown(DAG, Subtarget, DL, GatherVT,