Chandler Carruth 7fcb422bb2 [x86] Revert r212324 which was too aggressive w.r.t. allowing undef ... lanes in vector splats. The core problem here is that undef lanes can't *unilaterally* be considered to contribute to splats. Their handling needs to be more cautious. There is also a reported failure of the nightly testers (thanks Tobias!) that may well stem from the same core issue. I'm going to fix this theoretical issue, factor the APIs a bit better, and then verify that I don't see anything bad with Tobias's reduction from the test suite before recommitting. Original commit message for r212324: [x86] Generalize BuildVectorSDNode::getConstantSplatValue to work for any constant, constant FP, or undef splat and to tolerate any undef lanes in a splat, then replace all uses of isSplatVector in X86's lowering with it. This fixes issues where undef lanes in an otherwise splat vector would prevent the splat logic from firing. It is a touch more awkward to use this interface, but it is much more accurate. Suggestions for better interface structuring welcome. With this fix, the code generated with the widening legalization strategy for widen_cast-4.ll is *dramatically* improved as the special lowering strategies for a v16i8 SRA kick in even though the high lanes are undef. We also get a slightly different choice for broadcasting an aligned memory location, and use vpshufd instead of vbroadcastss. This looks like a minor win for pipelining and domain crossing, but a minor loss for the number of micro-ops. I suspect its a wash, but folks can easily tweak the lowering if they want. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212475 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-07 19:03:32 +00:00
..
PBQP	Function defined in a header should be inline. Found by modules build.	2014-04-24 23:14:32 +00:00
Analysis.h	Have isInTailCallPosition take the DAG so that we can use the	2014-06-10 20:39:38 +00:00
AsmPrinter.h	CodeGen: refactor DwarfException	2014-06-11 01:19:03 +00:00
CalcSpillWeights.h	CalcSpillWeights: allow overidding the spill weight normalizing function	2013-11-11 19:56:14 +00:00
CallingConvLower.h	ARM: HFAs must be passed in consecutive registers	2014-05-09 14:01:47 +00:00
CommandFlags.h	Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.	2014-06-05 19:29:43 +00:00
DAGCombine.h	Refactor DAGCombinerInfo. Change the different booleans that indicate if we are before or after different runs of DAGCo, with the CombineLevel enum.	2012-12-27 06:47:41 +00:00
DFAPacketizer.h	Sort the #include lines for the include/... tree with the script.	2012-12-03 17:02:12 +00:00
EdgeBundles.h	[modules] "Specialize" a function by actually specializing a function template	2014-04-24 18:27:29 +00:00
FastISel.h	Move function dependent resetting of a subtarget variable out of the	2014-07-04 01:55:26 +00:00
FunctionLoweringInfo.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
GCMetadata.h	Use unique_ptr to manage ownership of GCStrategy objects in GCMetadata	2014-04-15 05:34:49 +00:00
GCMetadataPrinter.h	Mark unimplemented copy constructors and copy assignment operators as LLVM_DELETED_FUNCTION.	2012-09-17 06:59:23 +00:00
GCs.h	Test commit: Remove trailing whitespace.	2014-03-10 22:24:07 +00:00
GCStrategy.h	Use unique_ptr to manage ownership of GCFunctionInfos in GCStrategy	2014-04-15 06:07:26 +00:00
IntrinsicLowering.h	Rename some member variables from TD to DL.	2014-02-18 15:33:12 +00:00
ISDOpcodes.h	IR: add "cmpxchg weak" variant to support permitted failure.	2014-06-13 14:24:07 +00:00
JITCodeEmitter.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
JumpInstrTables.h	Escape "@function" with \verbatim. [-Wdocumentation]	2014-06-08 23:25:02 +00:00
LatencyPriorityQueue.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LexicalScopes.h	DebugInfo: Reapply r209984 (reverted in r210143), asserting that abstract DbgVariables have DIEs.	2014-06-04 23:50:52 +00:00
LinkAllAsmWriterComponents.h	Add a GC plugin for Erlang	2013-03-25 13:47:46 +00:00
LinkAllCodegenComponents.h	[C++] Use 'nullptr'.	2014-04-24 06:44:33 +00:00
LiveInterval.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LiveIntervalAnalysis.h	Calculate dead instructions when a live interval is created.	2014-06-03 22:42:10 +00:00
LiveIntervalUnion.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LivePhysRegs.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LiveRangeEdit.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LiveRegMatrix.h	[C++11] Replace OwningPtr with std::unique_ptr in places where it doesn't break the API.	2014-04-21 09:34:48 +00:00
LiveStackAnalysis.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
LiveVariables.h	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-07 09:26:03 +00:00
MachineBasicBlock.h	Fix missing const	2014-07-02 06:45:26 +00:00
MachineBlockFrequencyInfo.h	blockfreq: Remove unnecessary template parameters	2014-04-11 23:21:02 +00:00
MachineBranchProbabilityInfo.h	blockfreq: Use const in MachineBlockFrequencyInfo	2014-03-25 18:01:32 +00:00
MachineCodeEmitter.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineCodeInfo.h	[C++] Use 'nullptr'.	2014-04-24 06:44:33 +00:00
MachineConstantPool.h	Directly access objects which may change during compilation.	2013-06-17 20:41:25 +00:00
MachineDominators.h	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-07 09:26:03 +00:00
MachineFrameInfo.h	Re-apply r211399, "Generate native unwind info on Win64" with a fix to ignore SEH pseudo ops in X86 JIT emitter.	2014-06-25 12:41:52 +00:00
MachineFunction.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineFunctionAnalysis.h	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-07 09:26:03 +00:00
MachineFunctionPass.h	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-07 09:26:03 +00:00
MachineInstr.h	fixed typo in comment	2014-07-03 16:17:20 +00:00
MachineInstrBuilder.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineInstrBundle.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineJumpTableInfo.h	Sort the #include lines for the include/... tree with the script.	2012-12-03 17:02:12 +00:00
MachineLoopInfo.h	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-07 09:26:03 +00:00
MachineMemOperand.h	Break PseudoSourceValue out of the Value hierarchy. It is now the root of its own tree containing FixedStackPseudoSourceValue (which you can use isa/dyn_cast on) and MipsCallEntry (which you can't). Anything that needs to use either a PseudoSourceValue* and Value* is strongly encouraged to use a MachinePointerInfo instead.	2014-04-15 07:22:52 +00:00
MachineModuleInfo.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineModuleInfoImpls.h	Rename virtual table anchors from Anchor() to anchor() for consistency with the rest of the tree.	2012-09-26 06:36:36 +00:00
MachineOperand.h	Clean up language and grammar.	2014-05-20 17:11:11 +00:00
MachinePassRegistry.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachinePostDominators.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineRegisterInfo.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineRelocation.h	[typo] An LLVM.	2013-08-16 23:30:19 +00:00
MachineScheduler.h	Move remaining LLVM_ENABLE_DUMP conditionals out of the headers	2014-07-01 21:19:13 +00:00
MachineSSAUpdater.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineTraceMetrics.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
MachineValueType.h	Make the copy member of StringRef/ArrayRef generic wrt allocators.	2014-04-18 16:36:15 +00:00
MachORelocation.h	Fix include guards so they exactly match file names.	2013-01-10 00:45:19 +00:00
Passes.h	Move GlobalMerge from Transform to CodeGen.	2014-06-13 22:57:59 +00:00
PseudoSourceValue.h	Fix broken build of llvm using clang.	2014-04-15 08:10:46 +00:00
RegAllocPBQP.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
RegAllocRegistry.h	Fix include guards so they exactly match file names.	2013-01-10 00:45:19 +00:00
RegisterClassInfo.h	[C++11] Replace OwningPtr with std::unique_ptr in places where it doesn't break the API.	2014-04-21 09:34:48 +00:00
RegisterPressure.h	Move remaining LLVM_ENABLE_DUMP conditionals out of the headers	2014-07-01 21:19:13 +00:00
RegisterScavenging.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
ResourcePriorityQueue.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
RuntimeLibcalls.h	Fix filename in header comment	2013-11-16 15:40:54 +00:00
ScheduleDAG.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
ScheduleDAGInstrs.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
ScheduleDFS.h	Move remaining LLVM_ENABLE_DUMP conditionals out of the headers	2014-07-01 21:19:13 +00:00
ScheduleHazardRecognizer.h	Add two additional hazard recognizer functions	2013-12-11 22:33:43 +00:00
SchedulerRegistry.h	Fix include guards so they exactly match file names.	2013-01-10 00:45:19 +00:00
ScoreboardHazardRecognizer.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
SelectionDAG.h	IR: add "cmpxchg weak" variant to support permitted failure.	2014-06-13 14:24:07 +00:00
SelectionDAGISel.h	Implememting named register intrinsics	2014-05-06 16:51:25 +00:00
SelectionDAGNodes.h	[x86] Revert r212324 which was too aggressive w.r.t. allowing undef	2014-07-07 19:03:32 +00:00
SlotIndexes.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
StackMapLivenessAnalysis.h	[StackMaps] Enable patchpoint liveness analysis per default.	2014-06-26 23:39:52 +00:00
StackMaps.h	[Stackmaps] Pacify windows buildbot.	2014-05-01 22:39:26 +00:00
StackProtector.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
TargetLoweringObjectFileImpl.h	Fix a few issues with comdat handling on COFF.	2014-06-06 19:26:12 +00:00
TargetSchedule.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00
ValueTypes.h	[C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr.	2014-04-09 06:08:46 +00:00
ValueTypes.td	Implement aarch64 neon instruction set AdvSIMD (Across).	2013-10-05 08:22:10 +00:00
VirtRegMap.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-14 00:51:57 +00:00