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author | Chris Lattner <sabre@nondot.org> | 2008-07-10 00:28:11 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2008-07-10 00:28:11 +0000 |
commit | 8638144825f43fe59b0e1b78d65d93f0a7b737a7 (patch) | |
tree | e7bb7aad7a24a0e2de30f8656b27b29a5f874b42 /lib/VMCore/Constants.cpp | |
parent | 330e7e4d250653243afaaeef4c01a7c12c314b39 (diff) | |
download | external_llvm-8638144825f43fe59b0e1b78d65d93f0a7b737a7.zip external_llvm-8638144825f43fe59b0e1b78d65d93f0a7b737a7.tar.gz external_llvm-8638144825f43fe59b0e1b78d65d93f0a7b737a7.tar.bz2 |
add a helper method for code that wants to handle vector
constants by element without caring how they are formed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53381 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/Constants.cpp')
-rw-r--r-- | lib/VMCore/Constants.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp index 9d898f0..7908638 100644 --- a/lib/VMCore/Constants.cpp +++ b/lib/VMCore/Constants.cpp @@ -155,6 +155,31 @@ ConstantVector *ConstantVector::getAllOnesValue(const VectorType *Ty) { } +/// getVectorElements - This method, which is only valid on constant of vector +/// type, returns the elements of the vector in the specified smallvector. +/// This handles breaking down a vector undef into undef elements, etc. +void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const { + assert(isa<VectorType>(getType()) && "Not a vector constant!"); + + if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) { + for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i) + Elts.push_back(CV->getOperand(i)); + return; + } + + const VectorType *VT = cast<VectorType>(getType()); + if (isa<ConstantAggregateZero>(this)) { + Elts.assign(VT->getNumElements(), + Constant::getNullValue(VT->getElementType())); + return; + } + + assert(isa<UndefValue>(this) && "Unknown vector constant type!"); + Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType())); +} + + + //===----------------------------------------------------------------------===// // ConstantInt //===----------------------------------------------------------------------===// |