From edad5bcb76bf472a1487c0f3dd94a5914213a647 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 2 Dec 2017 12:46:23 +0000
Subject: Vendor import of llvm release_50 branch r319231:
 https://llvm.org/svn/llvm-project/llvm/branches/release_50@319231

---
 lib/Target/AArch64/AArch64RedundantCopyElimination.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/Target/AArch64/AArch64RedundantCopyElimination.cpp')

diff --git a/lib/Target/AArch64/AArch64RedundantCopyElimination.cpp b/lib/Target/AArch64/AArch64RedundantCopyElimination.cpp
index 4e65c0ab6011..22c11c7276d2 100644
--- a/lib/Target/AArch64/AArch64RedundantCopyElimination.cpp
+++ b/lib/Target/AArch64/AArch64RedundantCopyElimination.cpp
@@ -167,6 +167,9 @@ AArch64RedundantCopyElimination::knownRegValInBlock(
     // CMP is an alias for SUBS with a dead destination register.
     case AArch64::SUBSWri:
     case AArch64::SUBSXri: {
+      // Sometimes the first operand is a FrameIndex. Bail if tht happens.
+      if (!PredI.getOperand(1).isReg())
+        return None;
       MCPhysReg SrcReg = PredI.getOperand(1).getReg();
 
       // Must not be a symbolic immediate.
-- 
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