From e063e1f68a43354795a626b6546c50ade038437e Mon Sep 17 00:00:00 2001
From: Quentin Colombet <qcolombet@apple.com>
Date: Fri, 26 Aug 2016 22:32:55 +0000
Subject: [PATCH] [SelectionDAG] Do not run the ISel process on already
 selected code.

Right now, this cannot happen, but with the fall back path of GlobalISel
it will show up eventually.

llvm-svn: 279877
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index e886d67..b9c4eb3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -426,6 +426,10 @@ static void SplitCriticalSideEffectEdges(Function &Fn) {
 }
 
 bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
+  // If we already selected that function, we do not need to run SDISel.
+  if (mf.getProperties().hasProperty(
+          MachineFunctionProperties::Property::Selected))
+    return false;
   // Do some sanity-checking on the command-line options.
   assert((!EnableFastISelVerbose || TM.Options.EnableFastISel) &&
          "-fast-isel-verbose requires -fast-isel");
-- 
2.7.4