From 1bce6ea7b79cbceab5cd0d458a552fd6bf805c09 Mon Sep 17 00:00:00 2001
From: Igor Breger <igor.breger@intel.com>
Date: Sun, 20 Aug 2017 06:26:22 +0000
Subject: [PATCH] [GlobalIsel] Fix undefined behavior if Action not set
 (release), it aslo crashing in debug mode.

Differential Revision: https://reviews.llvm.org/D34978

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311272 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/GlobalISel/LegalizerInfo.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h b/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h
index c259e93fdd3..b229411c814 100644
--- a/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h
+++ b/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h
@@ -162,6 +162,9 @@ public:
   /// on Ty until we find a legal type for this operation.
   Optional<LLT> findLegalizableSize(const InstrAspect &Aspect,
                                     function_ref<LLT(LLT)> NextType) const {
+    if (Aspect.Idx >= Actions[Aspect.Opcode - FirstOp].size())
+      return None;
+
     LegalizeAction Action;
     const TypeMap &Map = Actions[Aspect.Opcode - FirstOp][Aspect.Idx];
     LLT Ty = Aspect.Type;
-- 
2.40.0