From 54801f78b1ed0078a4c07cbb5472830335987f66 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 5 Feb 2009 22:24:17 +0000
Subject: isAsCheapAsMove instructions can have register src operands. Check if
 they are really re-materializable. This fixes sse.expandfft and sse.stepfft.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63890 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SimpleRegisterCoalescing.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 28d249235d..f09eee64b2 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -558,6 +558,9 @@ bool SimpleRegisterCoalescing::ReMaterializeTrivialDef(LiveInterval &SrcInt,
   const TargetInstrDesc &TID = DefMI->getDesc();
   if (!TID.isAsCheapAsAMove())
     return false;
+  if (!DefMI->getDesc().isRematerializable() ||
+      !tii_->isTriviallyReMaterializable(DefMI))
+    return false;
   bool SawStore = false;
   if (!DefMI->isSafeToMove(tii_, SawStore))
     return false;
-- 
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