llvm-project

0c4023ae - [RISCV] Use Root instead of N throughout the worklist loop in combineBinOp_VLToVWBinOp_VL. (#99416)

[RISCV] Use Root instead of N throughout the worklist loop in combineBinOp_VLToVWBinOp_VL. (#99416) We were only checking that the node from the worklist is a supported root. We weren't checking the strategy or any of its operands unless it was the original node. For any other node, we just rechecked the original node's strategy and operands. The effect of this is that we don't do all of the transformations at once. Instead, when there were multiple possible nodes to transform we would only do them as each node was visited by the main DAG combine worklist. The test shows a case where we widened an instruction without removing all of the uses of the vsext. The sext is shared by one node that shares another sext node with the root another node that doesn't share anything with the root.