Peter Collingbourne 54e8749794 WholeProgramDevirt: introduce. ... This pass implements whole program optimization of virtual calls in cases where we know (via bitset information) that the list of callees is fixed. This includes the following: - Single implementation devirtualization: if a virtual call has a single possible callee, replace all calls with a direct call to that callee. - Virtual constant propagation: if the virtual function's return type is an integer <=64 bits and all possible callees are readnone, for each class and each list of constant arguments: evaluate the function, store the return value alongside the virtual table, and rewrite each virtual call as a load from the virtual table. - Uniform return value optimization: if the conditions for virtual constant propagation hold and each function returns the same constant value, replace each virtual call with that constant. - Unique return value optimization for i1 return values: if the conditions for virtual constant propagation hold and a single vtable's function returns 0, or a single vtable's function returns 1, replace each virtual call with a comparison of the vptr against that vtable's address. Differential Revision: http://reviews.llvm.org/D16795 llvm-svn: 260312		2016-02-09 22:50:34 +00:00
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IPO	WholeProgramDevirt: introduce.	2016-02-09 22:50:34 +00:00
Utils	Remove autoconf support	2016-01-26 21:29:08 +00:00
CMakeLists.txt	Introduce bitset metadata format and bitset lowering pass.	2015-02-20 20:30:47 +00:00