From ee61fcf98bb84e7e9f3450035bef92c4d087c0ae Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Fri, 27 Aug 2010 23:29:38 +0000
Subject: Improve the precision of getConstant().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112323 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/LazyValueInfo.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/Analysis/LazyValueInfo.cpp')

diff --git a/lib/Analysis/LazyValueInfo.cpp b/lib/Analysis/LazyValueInfo.cpp
index 7e00f14..e7929f3 100644
--- a/lib/Analysis/LazyValueInfo.cpp
+++ b/lib/Analysis/LazyValueInfo.cpp
@@ -846,6 +846,11 @@ Constant *LazyValueInfo::getConstant(Value *V, BasicBlock *BB) {
   
   if (Result.isConstant())
     return Result.getConstant();
+  else if (Result.isConstantRange()) {
+    ConstantRange CR = Result.getConstantRange();
+    if (const APInt *SingleVal = CR.getSingleElement())
+      return ConstantInt::get(V->getContext(), *SingleVal);
+  }
   return 0;
 }
 
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