[AArch64] Use getNegative instead of manually sub with 0 (NFC)

[AZero13]

No description provided.

[llvmbot]

@llvm/pr-subscribers-backend-aarch64

Author: AZero13 (AZero13)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/158511.diff

1 Files Affected:

• (modified) llvm/lib/Target/AArch64/AArch64ISelLowering.cpp (+2-2)

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index d7c90bcb9723d..fc683afa2364a 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -7312,8 +7312,8 @@ SDValue AArch64TargetLowering::LowerABS(SDValue Op, SelectionDAG &DAG) const {
     return LowerToPredicatedOp(Op, DAG, AArch64ISD::ABS_MERGE_PASSTHRU);
 
   SDLoc DL(Op);
-  SDValue Neg = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, DL, VT),
-                            Op.getOperand(0));
+  SDValue Neg = DAG.getNegative(Op.getOperand(0), DL, VT);
+
   // Generate SUBS & CSEL.
   SDValue Cmp = DAG.getNode(AArch64ISD::SUBS, DL, DAG.getVTList(VT, FlagsVT),
                             Op.getOperand(0), DAG.getConstant(0, DL, VT));

[topperc]

LGTM

[AZero13]

LGTM

Thank you can you please merge?

[AZero13]

@topperc