From 9c15f4c9c98d884ff5427df69f9859a95b75c2fb Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Tue, 7 Jan 2014 07:31:10 +0000
Subject: Fix for PR18396: Assertion: MO->isDead "Cannot fold physreg def".

InlineSpiller::foldMemoryOperand needs to handle undef call operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198679 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/InlineSpiller.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index bb0e642313..70d97c0f55 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -1098,12 +1098,11 @@ foldMemoryOperand(ArrayRef<std::pair<MachineInstr*, unsigned> > Ops,
         MRI.isReserved(Reg)) {
       continue;
     }
+    // Skip non-Defs, including undef uses and internal reads.
+    if (MO->isUse())
+      continue;
     MIBundleOperands::PhysRegInfo RI =
       MIBundleOperands(FoldMI).analyzePhysReg(Reg, &TRI);
-    if (MO->readsReg()) {
-      assert(RI.Reads && "Cannot fold physreg reader");
-      continue;
-    }
     if (RI.Defines)
       continue;
     // FoldMI does not define this physreg. Remove the LI segment.
-- 
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