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author | Chris Lattner <sabre@nondot.org> | 2007-04-14 00:12:57 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2007-04-14 00:12:57 +0000 |
commit | 6f771d435111cd943414ab570e9aec0c7a6c2954 (patch) | |
tree | 4a331f0ec578b15450e28e2f0144047bf81280c5 /lib/VMCore/Instructions.cpp | |
parent | 0468ab302537912264f61066fe8b780e52c7f5ef (diff) | |
download | external_llvm-6f771d435111cd943414ab570e9aec0c7a6c2954.zip external_llvm-6f771d435111cd943414ab570e9aec0c7a6c2954.tar.gz external_llvm-6f771d435111cd943414ab570e9aec0c7a6c2954.tar.bz2 |
add GetElementPtrInst::hasAllZeroIndices, a long-overdue helper method.
Writing it twice in the same day was too much for me.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35978 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/Instructions.cpp')
-rw-r--r-- | lib/VMCore/Instructions.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp index f6abd85..bfda46d 100644 --- a/lib/VMCore/Instructions.cpp +++ b/lib/VMCore/Instructions.cpp @@ -966,6 +966,22 @@ const Type* GetElementPtrInst::getIndexedType(const Type *Ptr, Value *Idx) { return PTy->getElementType(); } + +/// hasAllZeroIndices - Return true if all of the indices of this GEP are +/// zeros. If so, the result pointer and the first operand have the same +/// value, just potentially different types. +bool GetElementPtrInst::hasAllZeroIndices() const { + for (unsigned i = 1, e = getNumOperands(); i != e; ++i) { + if (ConstantInt *CI = dyn_cast<ConstantInt>(getOperand(i))) { + if (!CI->isZero()) return false; + } else { + return false; + } + } + return true; +} + + //===----------------------------------------------------------------------===// // ExtractElementInst Implementation //===----------------------------------------------------------------------===// |