[llvm-commits] CVS: llvm/lib/Transforms/Scalar/InstructionCombining.cpp

[Zhou Sheng]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.669 -> 1.670
---
Log message:

Simplify isHighOnes().


---
Diffs of the changes:  (+1 -9)

 InstructionCombining.cpp |   10 +---------
 1 files changed, 1 insertion(+), 9 deletions(-)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.669 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.670
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.669	Mon Mar 19 19:16:52 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Tue Mar 20 07:49:06 2007
@@ -3491,15 +3491,7 @@
 // isHighOnes - Return true if the constant is of the form 1+0+.
 // This is the same as lowones(~X).
 static bool isHighOnes(const ConstantInt *CI) {
-  if (CI->getValue() == 0) return false;  // 0's does not match "1+"
-
-  APInt V(~CI->getValue());
-
-  // There won't be bits set in parts that the type doesn't contain.
-  V &= APInt::getAllOnesValue(CI->getType()->getBitWidth());
-
-  APInt U(V+1);  // If it is low ones, this should be a power of two.
-  return (U!=0) && (V!=0) && (U & V) == 0;
+  return (~CI->getValue() + 1).isPowerOf2();
 }
 
 /// getICmpCode - Encode a icmp predicate into a three bit mask.  These bits