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
..
CMakeLists.txt	build/CMake: Finish removal of add_llvm_library_dependencies.	2011-11-29 19:25:30 +00:00
DAGCombiner.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
FastISel.cpp	[fast-isel] SelectInsertValue seems to be causing miscompiles for ARM. Disable while I investigate.	2011-12-10 21:27:40 +00:00
FunctionLoweringInfo.cpp	An array of chars of length 8 will also cause the stack protector to be inserted	2011-11-02 23:20:58 +00:00
InstrEmitter.cpp	Add bundle aware API for querying instruction properties and switch the code	2011-12-07 07:15:52 +00:00
InstrEmitter.h	Simplify EXTRACT_SUBREG emission.	2011-10-05 20:26:40 +00:00
LegalizeDAG.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
LegalizeFloatTypes.cpp	Added invariant field to the DAG.getLoad method and changed all calls.	2011-11-08 18:42:53 +00:00
LegalizeIntegerTypes.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
LegalizeTypes.cpp	Added invariant field to the DAG.getLoad method and changed all calls.	2011-11-08 18:42:53 +00:00
LegalizeTypes.h	1. Fix the widening of SETCC in WidenVecOp_SETCC. Use the correct return CC type.	2011-10-21 11:42:07 +00:00
LegalizeTypesGeneric.cpp	Remove some unnecessary includes of PseudoSourceValue.h.	2011-11-15 07:50:46 +00:00
LegalizeVectorOps.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
LegalizeVectorTypes.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile
ScheduleDAGFast.cpp	- Rename TargetInstrDesc, TargetOperandInfo to MCInstrDesc and MCOperandInfo and	2011-06-28 19:10:37 +00:00
ScheduleDAGRRList.cpp	Make sure we correctly set LiveRegGens when a call is unscheduled. <rdar://problem/10460321>. No testcase because this is very sensitive to scheduling.	2011-12-07 22:24:28 +00:00
ScheduleDAGSDNodes.cpp	Rename TargetSubtarget to TargetSubtargetInfo for consistency.	2011-07-01 21:01:15 +00:00
ScheduleDAGSDNodes.h	The index stored in the RegDefIter is one after the current index. When getting the index, decrement it so that it points to the current element. Fixes an off-by-one bug encountered when trying to make use of MVT::untyped.	2011-06-27 18:34:12 +00:00
SDNodeDbgValue.h	Do not lose debug info of an inlined function argument even if the argument is only used through GEPs.	2011-02-18 22:43:42 +00:00
SDNodeOrdering.h
SelectionDAG.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
SelectionDAGBuilder.cpp	Initial CodeGen support for CTTZ/CTLZ where a zero input produces an	2011-12-13 01:56:10 +00:00
SelectionDAGBuilder.h	Enhance both TargetLibraryInfo and SelectionDAGBuilder so that the latter can use the former to prevent the formation of libm SDNode's when -fno-builtin is passed.	2011-12-08 22:15:21 +00:00
SelectionDAGISel.cpp	[fast-isel] Guard "exhastive" fast-isel output with -fast-isel-verbose2.	2011-12-13 00:05:11 +00:00
SelectionDAGPrinter.cpp	Twinify GraphWriter a little bit.	2011-11-15 16:26:38 +00:00
TargetLowering.cpp	Fix a couple of logic bugs in TargetLowering::SimplifyDemandedBits. PR11514.	2011-12-09 01:16:26 +00:00
TargetSelectionDAGInfo.cpp	Implement a bunch more TargetSelectionDAGInfo infrastructure.	2010-05-11 17:31:57 +00:00