From d0dd24a381a7ee54cb42201889a0d4533b0f9ffa Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Thu, 6 Feb 2020 08:34:18 -0500
Subject: [PATCH] AMDGPU/GlobalISel: Fix crashing on weird G_INSERT sources

No test since these cases shouldn't really be getting through the
legalizer.
---
 llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
index 7c4fd81..9e1fb42 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -737,7 +737,7 @@ bool AMDGPUInstructionSelector::selectG_INSERT(MachineInstr &I) const {
   // Deal with weird cases where the class only partially supports the subreg
   // index.
   Src0RC = TRI.getSubClassWithSubReg(Src0RC, SubReg);
-  if (!Src0RC)
+  if (!Src0RC || !Src1RC)
     return false;
 
   if (!RBI.constrainGenericRegister(DstReg, *DstRC, *MRI) ||
-- 
2.7.4