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| author | Zhou Sheng <zhousheng00@gmail.com> | 2007-03-20 12:49:06 +0000 |
|---|---|---|
| committer | Zhou Sheng <zhousheng00@gmail.com> | 2007-03-20 12:49:06 +0000 |
| commit | 2cde46cb6645569db996b303716080a92bbdfa9b (patch) | |
| tree | 2cbfff1cbcc9da175bf3adec4a82831897d90a71 /lib | |
| parent | 07073e5f70e2146583980aebb0804b82fe6581a2 (diff) | |
| download | external_llvm-2cde46cb6645569db996b303716080a92bbdfa9b.zip external_llvm-2cde46cb6645569db996b303716080a92bbdfa9b.tar.gz external_llvm-2cde46cb6645569db996b303716080a92bbdfa9b.tar.bz2 | |
Simplify isHighOnes().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35211 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 287a007..891868b 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -3491,15 +3491,7 @@ static bool isLowOnes(const ConstantInt *CI) { // 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 |