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| author | Erik Pilkington <erik.pilkington@gmail.com> | 2019-07-02 18:28:13 +0000 |
|---|---|---|
| committer | Erik Pilkington <erik.pilkington@gmail.com> | 2019-07-02 18:28:13 +0000 |
| commit | eee944e7f9e60df44714eb547d0b876ee5dc7290 (patch) | |
| tree | bfbb77d0b88de0f45c22ce3747d8d214d0f5a0d7 /clang/include/clang-c | |
| parent | 5613874947462fd4ceb4f66926c879269609463f (diff) | |
| download | bcm5719-llvm-eee944e7f9e60df44714eb547d0b876ee5dc7290.tar.gz bcm5719-llvm-eee944e7f9e60df44714eb547d0b876ee5dc7290.zip | |
[C++2a] Add __builtin_bit_cast, used to implement std::bit_cast
This commit adds a new builtin, __builtin_bit_cast(T, v), which performs a
bit_cast from a value v to a type T. This expression can be evaluated at
compile time under specific circumstances.
The compile time evaluation currently doesn't support bit-fields, but I'm
planning on fixing this in a follow up (some of the logic for figuring this out
is in CodeGen). I'm also planning follow-ups for supporting some more esoteric
types that the constexpr evaluator supports, as well as extending
__builtin_memcpy constexpr evaluation to use the same infrastructure.
rdar://44987528
Differential revision: https://reviews.llvm.org/D62825
llvm-svn: 364954
Diffstat (limited to 'clang/include/clang-c')
| -rw-r--r-- | clang/include/clang-c/Index.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h index 07e71bd48d0..74badac740b 100644 --- a/clang/include/clang-c/Index.h +++ b/clang/include/clang-c/Index.h @@ -2546,7 +2546,11 @@ enum CXCursorKind { */ CXCursor_OMPTargetTeamsDistributeSimdDirective = 279, - CXCursor_LastStmt = CXCursor_OMPTargetTeamsDistributeSimdDirective, + /** C++2a std::bit_cast expression. + */ + CXCursor_BuiltinBitCastExpr = 280, + + CXCursor_LastStmt = CXCursor_BuiltinBitCastExpr, /** * Cursor that represents the translation unit itself. |
