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[Constant] add undef element query for vector constants; NFC

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This is likely to be used in D48987 and similar patches, 
so adding it as an NFC preliminary step.

llvm-svn: 336442
This commit is contained in:
Sanjay Patel 2018-07-06 14:52:36 +00:00
parent 5aeee587fd
commit 8e3ee5bc36
2 changed files with 14 additions and 0 deletions
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4
include/llvm/IR/Constant.h
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@ -87,6 +87,10 @@ public:
/// floating-point constant with all NaN elements.
bool isNaN() const;
/// Return true if this is a vector constant that includes any undefined
/// elements.
bool containsUndefElement() const;
/// Return true if evaluation of this constant could trap. This is true for
/// things like constant expressions that could divide by zero.
bool canTrap() const;

10
lib/IR/Constants.cpp
View File

@ -254,6 +254,16 @@ bool Constant::isNaN() const {
return true;
}
bool Constant::containsUndefElement() const {
if (!getType()->isVectorTy())
return false;
for (unsigned i = 0, e = getType()->getVectorNumElements(); i != e; ++i)
if (isa<UndefValue>(getAggregateElement(i)))
return true;
return false;
}
/// Constructor to create a '0' constant of arbitrary type.
Constant *Constant::getNullValue(Type *Ty) {
switch (Ty->getTypeID()) {