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Philip Reames 4527f27ca2 Carry facts about nullness and undef across GC relocation 
This change implements four basic optimizations:

    If a relocated value isn't used, it doesn't need to be relocated.
    If the value being relocated is null, relocation doesn't change that. (Technically, this might be collector specific. I don't know of one which it doesn't work for though.)
    If the value being relocated is undef, the relocation is meaningless.
    If the value being relocated was known nonnull, the relocated pointer also isn't null. (Since it points to the same source language object.)

I outlined other planned work in comments.

Differential Revision: http://reviews.llvm.org/D6600

llvm-svn: 224968
2014-12-29 23:27:30 +00:00
..
Analysis ValueTracking: Small cleanup in ComputeNumSignBits 2014-12-26 09:20:17 +00:00
AsmParser IR: Make metadata typeless in assembly 2014-12-15 19:07:53 +00:00
Bitcode Fix Visual C++ error "'llvm::make_unique' : ambiguous call to overloaded function". 2014-12-18 10:03:35 +00:00
CodeGen Refactor duplicated code. 2014-12-29 15:18:31 +00:00
DebugInfo [DebugInfo] Move all DWARF headers to the public include directory. 2014-12-19 18:26:33 +00:00
ExecutionEngine [C API] Expose LLVMGetGlobalValueAddress and LLVMGetFunctionAddress. 2014-12-22 18:53:11 +00:00
IR Masked Load/Store - Changed the order of parameters in intrinsics. 2014-12-25 07:49:20 +00:00
IRReader
LineEditor
Linker Finish removing DestroySource. 2014-12-23 19:16:45 +00:00
LTO LTO: Lazy-load LTOModule in local contexts 2014-12-17 22:05:42 +00:00
MC Refactor duplicated code. 2014-12-29 15:18:31 +00:00
Object Add printing the LC_THREAD load commands with llvm-objdump’s -private-headers. 2014-12-23 22:56:39 +00:00
Option
ProfileData
Support Remove unnecessary StringRef->std::string conversion. 2014-12-29 20:59:02 +00:00
TableGen Clean up static analyzer warnings. 2014-12-12 21:48:03 +00:00
Target [Hexagon] Adding allocframe, post-increment circular immediate stores, post-increment circular register stores, and bit reversed post-increment stores. 2014-12-29 21:33:45 +00:00
Transforms Carry facts about nullness and undef across GC relocation 2014-12-29 23:27:30 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile