llvm-project

Author	SHA1	Message	Date
Richard Smith	74ce7112c3	Fix behavior of __builtin_bit_cast when the From and To types are the same. We were missing the lvalue-to-rvalue conversion entirely in this case, and in fact still need the full CK_LValueToRValueBitCast conversion to perform a load with no TBAA. llvm-svn: 373874	2019-10-07 02:45:12 +00:00
Erik Pilkington	2d225bbec1	NFC: Fix a poorly-written test The author of r364954 foolishly forgot that == binds tighter than ?: llvm-svn: 372631	2019-09-23 17:16:55 +00:00
David Bolvansky	7b4d40e8db	[NFC] Fixed failed test llvm-svn: 372533	2019-09-22 22:15:11 +00:00
Erik Pilkington	eee944e7f9	[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	2019-07-02 18:28:13 +00:00