From f77c03a8599ca354393292bb6c918ea8dab6a21d Mon Sep 17 00:00:00 2001
From: Hal Finkel <hfinkel@anl.gov>
Date: Fri, 24 Feb 2012 17:53:59 +0000
Subject: [PATCH] Don't crash when a glue node contains an internal CopyToReg

This is necessary to support the existing ppc lowering code for indirect calls.
Fixes PR12071.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151373 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/InstrEmitter.cpp |  3 +++
 test/CodeGen/PowerPC/ppc64-ind-call.ll    | 12 ++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 test/CodeGen/PowerPC/ppc64-ind-call.ll

diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 3f4f9e26254..1467d887789 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -766,6 +766,9 @@ EmitMachineNode(SDNode *Node, bool IsClone, bool IsCloned,
       if (F->getOpcode() == ISD::CopyFromReg) {
         UsedRegs.push_back(cast<RegisterSDNode>(F->getOperand(1))->getReg());
         continue;
+      } else if (F->getOpcode() == ISD::CopyToReg) {
+        // Skip CopyToReg nodes that are internal to the glue chain.
+        continue;
       }
       // Collect declared implicit uses.
       const MCInstrDesc &MCID = TII->get(F->getMachineOpcode());
diff --git a/test/CodeGen/PowerPC/ppc64-ind-call.ll b/test/CodeGen/PowerPC/ppc64-ind-call.ll
new file mode 100644
index 00000000000..f2d7cb489ed
--- /dev/null
+++ b/test/CodeGen/PowerPC/ppc64-ind-call.ll
@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=ppc64 | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+define void @test1() {
+entry:
+  %call.i75 = call zeroext i8 undef(i8* undef, i8 zeroext 10)
+  unreachable
+}
+
+; CHECK: @test1
+