[llvm] [ISel] Propagate disjoint flag in ShrinkDemandedOp (PR #114560)

[Yingwei Zheng via llvm-commits]

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@@ -609,6 +609,11 @@ bool TargetLowering::ShrinkDemandedOp(SDValue Op, unsigned BitWidth,
           Op.getOpcode(), dl, SmallVT,
           DAG.getNode(ISD::TRUNCATE, dl, SmallVT, Op.getOperand(0)),
           DAG.getNode(ISD::TRUNCATE, dl, SmallVT, Op.getOperand(1)));
+      // If the operation has the 'disjoint' flag, then the operands on
+      // the new node are also disjoint.
+      SDNodeFlags Flags = Op->getFlags();
+      X->setFlags(Flags.hasDisjoint() ? SDNodeFlags::Disjoint
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dtcxzyw wrote:

You can pass flags into `DAG.getNode`.


https://github.com/llvm/llvm-project/pull/114560