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Add some comments about undef.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103834 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-05-14 23:01:02 +00:00
parent 12c24690c7
commit fd72617688
1 changed files with 6 additions and 1 deletions
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7
include/llvm/Constants.h
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@ -923,7 +923,11 @@ DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantExpr, Constant)
/// UndefValue - 'undef' values are things that do not have specified contents. /// UndefValue - 'undef' values are things that do not have specified contents.
/// These are used for a variety of purposes, including global variable /// These are used for a variety of purposes, including global variable
/// initializers and operands to instructions. 'undef' values can occur with /// initializers and operands to instructions. 'undef' values can occur with
/// any type. /// any first-class type.
///
/// Undef values aren't exactly constants; if they have multiple uses, they
/// can appear to have different bit patterns at each use. See
/// LangRef.html#undefvalues for details.
/// ///
class UndefValue : public Constant { class UndefValue : public Constant {
friend struct ConstantCreator<UndefValue, Type, char>; friend struct ConstantCreator<UndefValue, Type, char>;
@ -954,6 +958,7 @@ public:
return V->getValueID() == UndefValueVal; return V->getValueID() == UndefValueVal;
} }
}; };
} // End llvm namespace } // End llvm namespace
#endif #endif