[llvm] 6d8cae7 - [X86] LowerShift - use DAG::getNegative() helper. NFC.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2024-04-29T17:44:38+01:00
New Revision: 6d8cae7f8bd47d7cf9ea447531f8810b66870ebe

URL: https://github.com/llvm/llvm-project/commit/6d8cae7f8bd47d7cf9ea447531f8810b66870ebe
DIFF: https://github.com/llvm/llvm-project/commit/6d8cae7f8bd47d7cf9ea447531f8810b66870ebe.diff

LOG: [X86] LowerShift - use DAG::getNegative() helper. NFC.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86ISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 3dca306a7642c9..ea876307f2aef3 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -29374,10 +29374,8 @@ static SDValue LowerShift(SDValue Op, const X86Subtarget &Subtarget,
   // +ve/-ve Amt = shift left/right.
   if (Subtarget.hasXOP() && (VT == MVT::v2i64 || VT == MVT::v4i32 ||
                              VT == MVT::v8i16 || VT == MVT::v16i8)) {
-    if (Opc == ISD::SRL || Opc == ISD::SRA) {
-      SDValue Zero = DAG.getConstant(0, dl, VT);
-      Amt = DAG.getNode(ISD::SUB, dl, VT, Zero, Amt);
-    }
+    if (Opc == ISD::SRL || Opc == ISD::SRA)
+      Amt = DAG.getNegative(Amt, dl, VT);
     if (Opc == ISD::SHL || Opc == ISD::SRL)
       return DAG.getNode(X86ISD::VPSHL, dl, VT, R, Amt);
     if (Opc == ISD::SRA)