Chandler Carruth 63974b2144 Initial CodeGen support for CTTZ/CTLZ where a zero input produces an ... undefined result. This adds new ISD nodes for the new semantics, selecting them when the LLVM intrinsic indicates that the undef behavior is desired. The new nodes expand trivially to the old nodes, so targets don't actually need to do anything to support these new nodes besides indicating that they should be expanded. I've done this for all the operand types that I could figure out for all the targets. Owners of various targets, please review and let me know if any of these are incorrect. Note that the expand behavior is *conservatively correct*, and exactly matches LLVM's current behavior with these operations. Ideally this patch will not change behavior in any way. For example the regtest suite finds the exact same instruction sequences coming out of the code generator. That's why there are no new tests here -- all of this is being exercised by the existing test suite. Thanks to Duncan Sands for reviewing the various bits of this patch and helping me get the wrinkles ironed out with expanding for each target. Also thanks to Chris for clarifying through all the discussions that this is indeed the approach he was looking for. That said, there are likely still rough spots. Further review much appreciated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146466 91177308-0d34-0410-b5e6-96231b3b80d8		2011-12-13 01:56:10 +00:00
..
ADT	Hexagon backend support	2011-12-12 21:14:40 +00:00
Analysis	Change the Dominators recalculate() function to only rely on GraphTraits	2011-12-05 19:17:04 +00:00
Assembly
Bitcode	Begin sketching out a bitcode verifier pass. Idea is to emit a .bc file and	2011-12-12 22:57:31 +00:00
CodeGen	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
Config
DebugInfo
ExecutionEngine	ExecutionEngine: refactor interface	2011-12-12 04:20:36 +00:00
MC	The second part of support for generating dwarf for assembly source files. This	2011-12-09 18:09:40 +00:00
Object
Support	Hexagon backend support	2011-12-12 21:14:40 +00:00
TableGen
Target	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
Transforms	SplitBlockPredecessors uses ArrayRef instead of Data and Size.	2011-12-09 21:19:53 +00:00
Argument.h
Attributes.h
AutoUpgrade.h
BasicBlock.h
CallGraphSCCPass.h
CallingConv.h
CMakeLists.txt
Constant.h
Constants.h
DebugInfoProbe.h
DefaultPasses.h
DerivedTypes.h
Function.h
GlobalAlias.h
GlobalValue.h
GlobalVariable.h
GVMaterializer.h
InitializePasses.h	Kill off the LoopSplitter. It's not being used or maintained.	2011-12-06 01:57:59 +00:00
InlineAsm.h
InstrTypes.h
Instruction.def
Instruction.h	Push StringRefs through the metadata interface.	2011-12-06 11:50:26 +00:00
Instructions.h
IntrinsicInst.h
Intrinsics.h
Intrinsics.td	Hexagon backend support	2011-12-12 21:14:40 +00:00
IntrinsicsARM.td
IntrinsicsCellSPU.td
IntrinsicsHexagon.td	Hexagon backend support	2011-12-12 21:14:40 +00:00
IntrinsicsPowerPC.td
IntrinsicsPTX.td
IntrinsicsX86.td
IntrinsicsXCore.td
LinkAllPasses.h	All these arguments are default anyways.	2011-12-06 00:11:58 +00:00
LinkAllVMCore.h
Linker.h
LLVMContext.h
Metadata.h	Add dump method for debugging.	2011-12-09 23:18:34 +00:00
Module.h
OperandTraits.h
Operator.h
Pass.h
PassAnalysisSupport.h
PassManager.h
PassManagers.h
PassRegistry.h
PassSupport.h	Add Tsan annotations to the pass system.	2011-12-08 00:15:41 +00:00
SymbolTableListTraits.h
Type.h
Use.h
User.h
Value.h
ValueSymbolTable.h