From 41bfb49b40cfa3a33bdfe9073a6342edaab98868 Mon Sep 17 00:00:00 2001
From: Hiroshi Inoue <inouehrs@jp.ibm.com>
Date: Mon, 16 Oct 2017 12:11:15 +0000
Subject: [PATCH] [PowerPC] fix up in sign-/zero-extension elimination

This patch fixes a potential problem in my previous commit (https://reviews.llvm.org/rL315888) by adding a null check.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315900 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCInstrInfo.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp
index 9da20d9bc6f..b4da2d65596 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -2256,6 +2256,8 @@ PPCInstrInfo::isSignOrZeroExtended(const MachineInstr &MI, bool SignExt,
           if (CallMI.isCall() && CallMI.getOperand(0).isGlobal()) {
             const Function *CalleeFn =
               dyn_cast<Function>(CallMI.getOperand(0).getGlobal());
+            if (!CalleeFn)
+              return false;
             const IntegerType *IntTy =
               dyn_cast<IntegerType>(CalleeFn->getReturnType());
             const AttributeSet &Attrs =
-- 
2.50.1