From ec65a7d89b3c23183433c69f43220a93f3573551 Mon Sep 17 00:00:00 2001
From: Dale Johannesen <dalej@apple.com>
Date: Tue, 14 Apr 2009 00:56:56 +0000
Subject: [PATCH] Do not force asm's to be chained if they don't touch memory
 and aren't volatile.  This was interfering with good scheduling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69008 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index 0fc5cb13cf4..96fae4d3eec 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -5439,6 +5439,9 @@ void SelectionDAGLowering::visitInlineAsm(CallSite CS) {
     }
 
     setValue(CS.getInstruction(), Val);
+    // Don't need to use this as a chain in this case.
+    if (!IA->hasSideEffects() && !hasMemory && IndirectStoresToEmit.empty())
+      return;
   }
 
   std::vector<std::pair<SDValue, Value*> > StoresToEmit;