From 5adeb93d8a7de8da5533f79112b8ce740e5584b3 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sun, 19 Feb 2012 03:18:29 +0000
Subject: [PATCH] APFloat::toString(): Fix overrun at scanning.

FYI, clang/test/SemaTemplate/template-id-printing.cpp had been failing due to it on cygwin-clang.

llvm-svn: 150911
---
 llvm/lib/Support/APFloat.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index 8913dd6def56..525aea28c676 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -3340,7 +3340,7 @@ namespace {
     // Rounding down is just a truncation, except we also want to drop
     // trailing zeros from the new result.
     if (buffer[FirstSignificant - 1] < '5') {
-      while (buffer[FirstSignificant] == '0')
+      while (FirstSignificant < N && buffer[FirstSignificant] == '0')
         FirstSignificant++;
 
       exp += FirstSignificant;