From fe0bfe4fa43b9a032cc54737ab56b979006b1b26 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Thu, 30 Jul 2009 08:44:08 +0000 Subject: [PATCH] I've changed the semantics of MERGE_VALUES a bit. It's now allowed to live until scheduling. It's deleted when the scheduler translate DAG nodes to machine instructions. This is currently used by X86 to handle atomic_load_add when the output of the node is not used. I believe there is a better solution. But I find MERGE_VALUES useful for selecting multi-output node when the dead output can be selected as a IMPLICIT_DEF. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77583 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/SelectionDAGNodes.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h index 62c3769ebe6..6dc55fff841 100644 --- a/include/llvm/CodeGen/SelectionDAGNodes.h +++ b/include/llvm/CodeGen/SelectionDAGNodes.h @@ -225,9 +225,9 @@ namespace ISD { // MERGE_VALUES - This node takes multiple discrete operands and returns // them all as its individual results. This nodes has exactly the same - // number of inputs and outputs, and is only valid before legalization. - // This node is useful for some pieces of the code generator that want to - // think about a single node with multiple results, not multiple nodes. + // number of inputs and outputs. This node is useful for some pieces of the + // code generator that want to think about a single node with multiple + // results, not multiple nodes. MERGE_VALUES, // Simple integer binary arithmetic operators. -- 2.11.0