From 6194cdc7b87d2bbaec5eabfa5a2e81fa2ca5f3d2 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 15 Feb 2007 19:05:25 +0000
Subject: [PATCH] Eliminate a redundent ctor; eliminate one more potential new
 [0].

llvm-svn: 34313
---
 llvm/include/llvm/ADT/BitVector.h | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/llvm/include/llvm/ADT/BitVector.h b/llvm/include/llvm/ADT/BitVector.h
index 94cbf0962140..a6ae1ac80d50 100644
--- a/llvm/include/llvm/ADT/BitVector.h
+++ b/llvm/include/llvm/ADT/BitVector.h
@@ -72,25 +72,23 @@ public:
     Bits = NULL;
   }
 
-  /// BitVector ctor - Creates a bitvector of specified number of bits. All
-  /// bits are initialized to false;
-  BitVector(unsigned s) : Size(s) {
-    Capacity = NumBitWords(s);
-    Bits = new BitWord[Capacity];
-    init_words(Bits, Capacity, false);
-  }
-
   /// BitVector ctor - Creates a bitvector of specified number of bits. All
   /// bits are initialized to the specified value.
-  BitVector(unsigned s, bool t) : Size(s) {
+  explicit BitVector(unsigned s, bool t = false) : Size(s) {
     Capacity = NumBitWords(s);
     Bits = new BitWord[Capacity];
     init_words(Bits, Capacity, t);
-    clear_unused_bits();
+    if (t)
+      clear_unused_bits();
   }
 
   /// BitVector copy ctor.
   BitVector(const BitVector &RHS) : Size(RHS.size()) {
+    if (Size == 0) {
+      Bits = NULL;
+      return;
+    }
+
     Capacity = NumBitWords(RHS.size());
     Bits = new BitWord[Capacity];
     std::copy(RHS.Bits, &RHS.Bits[Capacity], Bits);