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fd3f635103
llvm-6502/include/llvm/CodeGen
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Chris Lattner fd3f635103 Fix rdar://9289512 - not folding load into compare at -O0 
The basic issue here is that bottom-up isel is matching the branch
and compare, and was failing to fold the load into the branch/compare
combo.  Fixing this (by allowing folding into any instruction of a
sequence that is selected) allows us to produce things like:


cmpb    $0, 52(%rax)
je      LBB4_2

instead of:

movb    52(%rax), %cl
cmpb    $0, %cl
je      LBB4_2

This makes the generated -O0 code run a bit faster, but also speeds up
compile time by putting less pressure on the register allocator and 
generating less code.

This was one of the biggest classes of missing load folding.  Implementing
this shrinks 176.gcc's c-decl.s (as a random example) by about 4% in (verbose-asm)
line count.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129656 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-17 06:35:44 +00:00
..
PBQP
Analysis.h Enable sibling call optimization of libcalls which are expanded during 2010-11-30 23:55:39 +00:00
AsmPrinter.h Some refactoring suggested by Anton Korobeynikov. 2011-04-15 20:32:03 +00:00
BinaryObject.h Merge System into Support. 2010-11-29 18:16:10 +00:00
CalcSpillWeights.h Symbolize the default instruction distance. 2011-03-04 18:36:51 +00:00
CallingConvLower.h
EdgeBundles.h Build the Hopfield network incrementally when splitting global live ranges. 2011-04-09 02:59:09 +00:00
FastISel.h Teach FastISel to support register-immediate-immediate instructions. 2011-03-11 21:33:55 +00:00
FunctionLoweringInfo.h There are times when the landing pad won't have a call to 'eh.selector' in 2011-03-03 23:14:05 +00:00
GCMetadata.h
GCMetadataPrinter.h
GCs.h
GCStrategy.h
IntrinsicLowering.h Recognize inline asm 'rev /bin/bash, ' as a bswap intrinsic call. 2011-01-08 01:24:27 +00:00
ISDOpcodes.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
JITCodeEmitter.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
LatencyPriorityQueue.h Various bits of framework needed for precise machine-level selection 2010-12-24 05:03:26 +00:00
LinkAllAsmWriterComponents.h
LinkAllCodegenComponents.h Stub out RegAllocGreedy. 2010-12-08 03:26:16 +00:00
LiveInterval.h Rewrite instructions as part of ConnectedVNInfoEqClasses::Distribute. 2011-03-17 00:23:45 +00:00
LiveIntervalAnalysis.h Dead code elimination may separate the live interval into multiple connected components. 2011-03-17 20:37:07 +00:00
LiveStackAnalysis.h Teach TargetRegisterInfo how to cram stack slot indexes in with the virtual and 2011-01-09 21:17:37 +00:00
LiveVariables.h Use an IndexedMap for LiveVariables::VirtRegInfo. 2011-01-08 23:10:57 +00:00
MachineBasicBlock.h Cache the fairly expensive last split point computation and provide a fast 2011-04-05 04:20:27 +00:00
MachineCodeEmitter.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
MachineCodeInfo.h Merge System into Support. 2010-11-29 18:16:10 +00:00
MachineConstantPool.h Add comment to clarify what MachineConstantPoolEntry::isMachineConstantPoolEntry() means. 2011-03-24 06:28:45 +00:00
MachineDominators.h
MachineFrameInfo.h Tidy up. 2011-03-07 19:28:43 +00:00
MachineFunction.h Revert r124611 - "Keep track of incoming argument's location while emitting LiveIns." 2011-02-21 23:21:26 +00:00
MachineFunctionAnalysis.h Give MachineFunctionAnalysis a getPassName() implementation to make timing reports prettier. 2011-01-04 18:21:18 +00:00
MachineFunctionPass.h
MachineInstr.h 80 columns. 2011-03-11 21:02:27 +00:00
MachineInstrBuilder.h Provide hooks to set MI flags in MachineInstrBuilder 2011-03-05 18:43:20 +00:00
MachineJumpTableInfo.h
MachineLocation.h Merge .debug_loc entries whenever possible to reduce debug_loc size. 2011-02-04 22:57:18 +00:00
MachineLoopInfo.h
MachineLoopRanges.h Enable loop splitting in RegAllocGreedy. 2010-12-17 23:16:32 +00:00
MachineMemOperand.h Merge System into Support. 2010-11-29 18:16:10 +00:00
MachineModuleInfo.h Fix small bug in setDebugInfoAvailability. 2011-01-05 17:01:57 +00:00
MachineModuleInfoImpls.h
MachineOperand.h Simplify LiveDebugVariables by storing MachineOperand copies locations instead 2011-01-09 05:33:21 +00:00
MachinePassRegistry.h
MachineRegisterInfo.h Revert r124611 - "Keep track of incoming argument's location while emitting LiveIns." 2011-02-21 23:21:26 +00:00
MachineRelocation.h Merge System into Support. 2010-11-29 18:16:10 +00:00
MachineSSAUpdater.h
MachORelocation.h Merge System into Support. 2010-11-29 18:16:10 +00:00
ObjectCodeEmitter.h
Passes.h Add the SpillPlacement analysis pass. 2011-01-06 01:21:53 +00:00
ProcessImplicitDefs.h Place context in member variables instead of passing around pointers. 2011-03-14 20:57:14 +00:00
PseudoSourceValue.h
RegAllocPBQP.h Fixed some dependencies in RegAllocPBQP.h . Thanks to Borja Ferrer for pointing out this issue. 2010-12-08 22:15:32 +00:00
RegAllocRegistry.h
RegisterCoalescer.h Merge System into Support. 2010-11-29 18:16:10 +00:00
RegisterScavenging.h Teach the register scavenger to take subregs into account when finding a free register. 2011-03-05 00:20:19 +00:00
RuntimeLibcalls.h Issue libcalls __udivmod*i4 / __divmod*i4 for div / rem pairs. 2011-04-01 00:42:02 +00:00
ScheduleDAG.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
ScheduleHazardRecognizer.h Convert -enable-sched-cycles and -enable-sched-hazard to -disable 2011-01-21 05:51:33 +00:00
SchedulerRegistry.h
ScoreboardHazardRecognizer.h Various bits of framework needed for precise machine-level selection 2010-12-24 05:03:26 +00:00
SelectionDAG.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
SelectionDAGISel.h Fix rdar://9289512 - not folding load into compare at -O0 2011-04-17 06:35:44 +00:00
SelectionDAGNodes.h Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
SlotIndexes.h Skip a binary search when possible. 2011-04-11 20:01:44 +00:00
TargetLoweringObjectFileImpl.h Put each personality function in a section. This fixes the gnu ld warning: 2011-04-16 03:51:21 +00:00
ValueTypes.h rename MVT::Flag to MVT::Glue. "Flag" is a terrible name for 2010-12-21 02:38:05 +00:00
ValueTypes.td