From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Tue, 18 Dec 2018 09:27:29 +0000 (+0000)
Subject: GlobalISel: Improve crash on invalid mapping
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=563dd25b0e4b96d850be61064e9c884b45b233f9;p=llvm

GlobalISel: Improve crash on invalid mapping

If NumBreakDowns is 0, BreakDown is null.
This trades a null dereference with an assert somewhere
else.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349464 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/GlobalISel/RegBankSelect.cpp b/lib/CodeGen/GlobalISel/RegBankSelect.cpp
index 6bb48dc2e8a..98df7d34857 100644
--- a/lib/CodeGen/GlobalISel/RegBankSelect.cpp
+++ b/lib/CodeGen/GlobalISel/RegBankSelect.cpp
@@ -116,7 +116,7 @@ bool RegBankSelect::assignmentMatch(
   OnlyAssign = false;
   // Each part of a break down needs to end up in a different register.
   // In other word, Reg assignement does not match.
-  if (ValMapping.NumBreakDowns > 1)
+  if (ValMapping.NumBreakDowns != 1)
     return false;
 
   const RegisterBank *CurRegBank = RBI->getRegBank(Reg, *MRI, *TRI);