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| author | Dan Gohman <gohman@apple.com> | 2010-05-14 23:01:02 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-05-14 23:01:02 +0000 |
| commit | fd726176886b946ff4eaaf85bd254c5fbbacabfd (patch) | |
| tree | 1e5968a4c0da1245c56e1faafaf98c4890d31a1a /include/llvm/Constants.h | |
| parent | 12c24690c7dc53cf6e6ca8cb062255e82d568edf (diff) | |
| download | llvm-fd726176886b946ff4eaaf85bd254c5fbbacabfd.tar.gz llvm-fd726176886b946ff4eaaf85bd254c5fbbacabfd.tar.bz2 llvm-fd726176886b946ff4eaaf85bd254c5fbbacabfd.tar.xz | |
Add some comments about undef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103834 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/Constants.h')
| -rw-r--r-- | include/llvm/Constants.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h index ba0ace3f7a..9ca845ec9d 100644 --- a/include/llvm/Constants.h +++ b/include/llvm/Constants.h @@ -923,7 +923,11 @@ DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantExpr, Constant) /// UndefValue - 'undef' values are things that do not have specified contents. /// These are used for a variety of purposes, including global variable /// 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 { friend struct ConstantCreator<UndefValue, Type, char>; @@ -954,6 +958,7 @@ public: return V->getValueID() == UndefValueVal; } }; + } // End llvm namespace #endif |