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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 | 159cd770e3ea0c5cba37006c4dc96b3235670f0d (patch) | |
| tree | 0f7c041619d7593e111a77c1f79954b83b6dbf99 /lib/Parse/ParseExpr.cpp | |
| parent | 54b8029400637989d16f8467643c46296e62e1d3 (diff) | |
| download | clang-159cd770e3ea0c5cba37006c4dc96b3235670f0d.tar.gz | |
[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
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@364954 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Parse/ParseExpr.cpp')
| -rw-r--r-- | lib/Parse/ParseExpr.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp index dbea774118..b5c01fe60f 100644 --- a/lib/Parse/ParseExpr.cpp +++ b/lib/Parse/ParseExpr.cpp @@ -1223,6 +1223,9 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression, case tok::kw_static_cast: Res = ParseCXXCasts(); break; + case tok::kw___builtin_bit_cast: + Res = ParseBuiltinBitCast(); + break; case tok::kw_typeid: Res = ParseCXXTypeid(); break; |