From: Craig Topper <craig.topper@intel.com>
Date: Fri, 7 Jul 2017 19:56:18 +0000 (+0000)
Subject: [APInt] Add a fastpath for the single word case of isOneValue to match isNullValue... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8614bf0c87bb59fd0799873cd427f53079f121bb;p=llvm

[APInt] Add a fastpath for the single word case of isOneValue to match isNullValue, isAllOnesValue, etc. NFCI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307430 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h
index e5f0c35534a..a1cce6e5fe1 100644
--- a/include/llvm/ADT/APInt.h
+++ b/include/llvm/ADT/APInt.h
@@ -401,7 +401,11 @@ public:
   /// \brief Determine if this is a value of 1.
   ///
   /// This checks to see if the value of this APInt is one.
-  bool isOneValue() const { return getActiveBits() == 1; }
+  bool isOneValue() const {
+    if (isSingleWord())
+      return U.VAL == 1;
+    return countLeadingZerosSlowCase() == BitWidth - 1;
+  }
 
   /// \brief Determine if this is the largest unsigned value.
   ///