From c6dbe30e8831722e0ebf44345414275e723fa01a Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Mon, 1 Mar 2010 18:38:45 +0000
Subject: Don't potentially read past the end of the fill data when making a
 NaN from an APInt.

llvm-svn: 97467
---
 llvm/lib/Support/APFloat.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Support')

diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index 16a0c232927..619f061862c 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -638,7 +638,8 @@ void APFloat::makeNaN(bool SNaN, bool Negative, const APInt *fill)
   if (!fill || fill->getNumWords() < numParts)
     APInt::tcSet(significand, 0, numParts);
   if (fill) {
-    APInt::tcAssign(significand, fill->getRawData(), partCount());
+    APInt::tcAssign(significand, fill->getRawData(),
+                    std::min(fill->getNumWords(), numParts));
 
     // Zero out the excess bits of the significand.
     unsigned bitsToPreserve = semantics->precision - 1;
-- 
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