[llvm] r306155 - [APInt] Make the single word cases of isMaxSignedValue/isMinSignedValue just compare with the expected value rather than counting bits. NFCI

[Craig Topper via llvm-commits]

Author: ctopper
Date: Fri Jun 23 15:28:52 2017
New Revision: 306155

URL: http://llvm.org/viewvc/llvm-project?rev=306155&view=rev
Log:
[APInt] Make the single word cases of isMaxSignedValue/isMinSignedValue just compare with the expected value rather than counting bits. NFCI

Modified:
    llvm/trunk/include/llvm/ADT/APInt.h

Modified: llvm/trunk/include/llvm/ADT/APInt.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/APInt.h?rev=306155&r1=306154&r2=306155&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/APInt.h (original)
+++ llvm/trunk/include/llvm/ADT/APInt.h Fri Jun 23 15:28:52 2017
@@ -414,7 +414,9 @@ public:
   /// This checks to see if the value of this APInt is the maximum signed
   /// value for the APInt's bit width.
   bool isMaxSignedValue() const {
-    return !isNegative() && countTrailingOnes() == BitWidth - 1;
+    if (isSingleWord())
+      return U.VAL == ((WordType(1) << (BitWidth - 1)) - 1);
+    return !isNegative() && countTrailingOnesSlowCase() == BitWidth - 1;
   }
 
   /// \brief Determine if this is the smallest unsigned value.
@@ -428,7 +430,9 @@ public:
   /// This checks to see if the value of this APInt is the minimum signed
   /// value for the APInt's bit width.
   bool isMinSignedValue() const {
-    return isNegative() && countTrailingZeros() == BitWidth - 1;
+    if (isSingleWord())
+      return U.VAL == (WordType(1) << (BitWidth - 1));
+    return isNegative() && countTrailingZerosSlowCase() == BitWidth - 1;
   }
 
   /// \brief Check if this APInt has an N-bits unsigned integer value.