From bcdbfa854a91797f5b43ac8955aaeb44ba196aa4 Mon Sep 17 00:00:00 2001
From: Mon P Wang <wangmp@apple.com>
Date: Thu, 11 Dec 2008 03:30:13 +0000
Subject: Avoid generating a convert_rndsat node when the src and dest type are
 the same.

llvm-svn: 60869
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp')

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index bb3b42c383f..33eddae7f90 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1140,6 +1140,10 @@ SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
 SDValue SelectionDAG::getConvertRndSat(MVT VT, SDValue Val, SDValue DTy,
                                        SDValue STy, SDValue Rnd, SDValue Sat,
                                        ISD::CvtCode Code) {
+  // If the src and dest types are the same, no conversion is necessary.
+  if (DTy == STy)
+    return Val;
+
   FoldingSetNodeID ID;
   void* IP = 0;
   if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
-- 
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