Chandler Carruth 4d628e200f We really want to hash pairs of directly-hashable data as directly ... hashable data. This matters when we have pair<T*, U*> as a key, which is quite common in DenseMap, etc. To that end, we need to detect when this is safe. The requirements on a generic std::pair<T, U> are: 1) Both T and U must satisfy the existing is_hashable_data trait. Note that this includes the requirement that T and U have no internal padding bits or other bits not contributing directly to equality. 2) The alignment constraints of std::pair<T, U> do not require padding between consecutive objects. 3) The alignment constraints of U and the size of T do not conspire to require padding between the first and second elements. Grow two somewhat magical traits to detect this by forming a pod structure and inspecting offset artifacts on it. Hopefully this won't cause any compilers to panic. Added and adjusted tests now that pairs, even nested pairs, are treated as just sequences of data. Thanks to Jeffrey Yasskin for helping me sort through this and reviewing the somewhat subtle traits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151883 91177308-0d34-0410-b5e6-96231b3b80d8		2012-03-02 09:26:36 +00:00
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ADT	We really want to hash pairs of directly-hashable data as directly	2012-03-02 09:26:36 +00:00
Analysis	The product of two chrec's can always be represented as a chrec.	2011-10-04 06:51:26 +00:00
Bitcode	Bitcode: Don't expose WriteBitcodeToStream to clients.	2012-02-29 20:30:56 +00:00
ExecutionEngine	MCJIT support for non-function sections.	2012-01-16 22:26:39 +00:00
Support	BumpPtrAllocator: Make sure threshold cannot be initialized with a value smaller than the slab size.	2012-03-01 22:10:16 +00:00
Transforms	Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch	2011-12-20 02:50:00 +00:00
VMCore	Undo the hack in r147427 and move this unittest to a better home. This	2012-01-02 09:19:48 +00:00
CMakeLists.txt	Add a Briggs and Torczon sparse set implementation.	2012-02-22 00:56:08 +00:00
Makefile	Undo the hack in r147427 and move this unittest to a better home. This	2012-01-02 09:19:48 +00:00
Makefile.unittest	build/unittests: Fix llvm-config names for gtest libraries, and bring Makefile	2011-12-15 23:35:08 +00:00