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Jun Bum Lim 339e9723c1 [InstCombine] Simplify a known nonzero incoming value of PHI 
Summary:
When a PHI is used only to be compared with zero, it is possible to replace an
incoming value with any non-zero constant if the incoming value can be proved as
a known nonzero value. For example, in below code, we can replace the incoming value %v with
any non-zero constant based on the fact that the PHI is only used to be compared with zero
and %v is a known non-zero value:
  %v = select %cond, 1, 2
  %p = phi [%v, BB] ...
  %c = icmp eq, %p, 0

Reviewers: mcrosier, jmolloy, sanjoy

Subscribers: hfinkel, mcrosier, majnemer, llvm-commits, haicheng, bmakam, mssimpso, gberry

Differential Revision: http://reviews.llvm.org/D16240

llvm-svn: 260530
 		2016-02-11 15:50:07 +00:00
..
ADCE [PM] Port ADCE to the new pass manager 2015-10-30 23:13:18 +00:00
AddDiscriminators Reimplement discriminator assignment algorithm. 2015-11-19 19:53:05 +00:00
AlignmentFromAssumptions Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
ArgumentPromotion DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
AtomicExpand [IR] Add support for floating pointer atomic loads and stores 2015-12-16 00:49:36 +00:00
BBVectorize Have a single way for creating unique value names. 2015-11-22 00:16:24 +00:00
BDCE Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
BranchFolding Move branch folding test to a better location. 2015-12-03 19:41:25 +00:00
CodeExtractor Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
CodeGenPrepare AMDGPU: Remove some old intrinsic uses from tests 2016-02-11 06:02:01 +00:00
ConstProp IR: Make ConstantDataArray::getFP actually return a ConstantDataArray 2015-12-09 21:21:07 +00:00
ConstantHoisting
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ConstantMerge [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
CorrelatedValuePropagation [LVI] Introduce an intersect operation on lattice values 2016-02-02 03:15:40 +00:00
CrossDSOCFI [cfi] Cross-DSO CFI diagnostic mode (LLVM part). 2016-01-25 23:35:03 +00:00
DeadArgElim [OperandBundles] Have DeadArgElim play nice with operand bundles 2015-12-23 09:58:36 +00:00
DeadStoreElimination [BasicAliasAnalysis] Take into account operand bundles in the getModRefInfo function 2016-01-16 12:15:53 +00:00
EarlyCSE Fix several accidental DOS line endings in source files 2016-01-03 17:22:03 +00:00
EliminateAvailableExternally Don't change the visibility when converting a definition to a declaration. 2015-07-13 14:18:22 +00:00
Float2Int [Float2Int] Don't operate on vector instructions 2015-12-09 21:08:18 +00:00
ForcedFunctionAttrs [attrs] Split off the forced attributes utility into its own pass that 2015-12-27 08:13:45 +00:00
FunctionAttrs Add convergent-removing bits to FunctionAttrs pass. 2016-02-09 23:03:22 +00:00
FunctionImport FunctionImport: add a progressive heuristic to limit importing too deep in the callgraph 2016-02-10 23:31:45 +00:00
GCOVProfiling [GCOV] Avoid emitting profile arcs for module and skeleton CUs 2016-01-21 17:04:42 +00:00
GVN Fix for two constant propagation problems in GVN with the assume intrinsic 2016-01-21 21:32:35 +00:00
GlobalDCE [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
GlobalOpt Make sure that any new and optimized objects created during GlobalOPT copy all the attributes from the base object. 2016-01-22 21:18:20 +00:00
IPConstantProp [SCCP] Don't violate the lattice invariants 2016-01-07 21:36:16 +00:00
IRCE [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
IndVarSimplify [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
InferFunctionAttrs [BasicAA] Remove special casing of memset_pattern16 in favor of generic attribute inference 2016-01-06 04:53:16 +00:00
Inline Avoid inlining call sites in unreachable-terminated block 2016-02-01 20:55:11 +00:00
InstCombine [InstCombine] Simplify a known nonzero incoming value of PHI 2016-02-11 15:50:07 +00:00
InstMerge
…
InstSimplify [InstCombine] Simplify (x >> y) <= x 2016-01-21 18:55:54 +00:00
Internalize [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
JumpThreading [LVI] Introduce an intersect operation on lattice values 2016-02-02 03:15:40 +00:00
LCSSA [WinEH] Update LCSSA to handle catchswitch with handlers inside and outside a loop 2015-12-18 18:12:35 +00:00
LICM [LICM] Keep metadata on control equivalent hoists 2016-01-28 15:51:58 +00:00
LoadCombine
…
LoopDeletion
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LoopDistribute Allow LLE/LD and the loop versioning infrastructure to use SCEV predicates 2015-11-09 13:26:09 +00:00
LoopIdiom [LIR] Add support for structs and hand unrolled loops 2016-01-26 02:27:47 +00:00
LoopInterchange
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LoopLoadElim [LoopLoadElim] Don't allow versioning when optForSize 2016-02-05 01:14:05 +00:00
LoopReroll Enable loopreroll to rerool loop with pointer induction variable. 2016-01-25 19:43:45 +00:00
LoopRotate DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
LoopSimplify DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
LoopSimplifyCFG Add LoopSimplifyCFG pass 2016-01-29 22:35:36 +00:00
LoopStrengthReduce [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
LoopUnroll AMDGPU: Remove some old intrinsic uses from tests 2016-02-11 06:02:01 +00:00
LoopUnswitch [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
LoopVectorize [SCEV][LAA] Re-commit r260085 and r260086, this time with a fix for the memory 2016-02-08 17:02:45 +00:00
LoopVersioning [LoopVersioning] Expose loop versioning as a pass too 2016-02-03 00:06:10 +00:00
LoopVersioningLICM Corrected tests for Loop Versioning LICM, by adding “REQUIRES: asserts”. 2016-02-06 12:34:41 +00:00
LowerAtomic
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LowerBitSets [cfi] Fix LowerBitSets on 32-bit targets. 2015-12-21 22:14:04 +00:00
LowerExpectIntrinsic [PM] Port StripDeadPrototypes to the new pass manager 2015-10-30 23:28:12 +00:00
LowerInvoke Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
LowerSwitch Have a single way for creating unique value names. 2015-11-22 00:16:24 +00:00
Mem2Reg [Mem2Reg] Respect optnone 2015-12-11 13:36:59 +00:00
MemCpyOpt Fix PR26051: Memcpy optimization should introduce a call to memcpy before the store destination position 2016-01-06 23:50:22 +00:00
MergeFunc [IR] Remove terminatepad 2015-12-14 18:34:23 +00:00
MetaRenamer Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
NaryReassociate [NaryReassociate] allow candidate to have a different type 2015-12-18 21:36:30 +00:00
ObjCARC Add support for objc_unsafeClaimAutoreleasedReturnValue to the 2016-01-27 19:05:08 +00:00
PGOProfile [PGO] Indirect-call profile annotation in IR level profiling 2016-02-10 18:24:45 +00:00
PartiallyInlineLibCalls
…
PhaseOrdering Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
PlaceSafepoints [PlaceSafepoints] Clamp NoStatepoints to true 2016-01-28 21:51:14 +00:00
PruneEH [PruneEH] Don't try to insert a terminator after another terminator 2016-01-23 06:00:44 +00:00
Reassociate Reassociate: Reprocess RedoInsts after each inst 2016-01-26 18:42:36 +00:00
Reg2Mem Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
RewriteStatepointsForGC [RS4GC] Remove unnecessary redirections from tests; NFC 2016-01-29 16:32:30 +00:00
SCCP [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
SLPVectorizer Add test case missing from r259357 (NFC) 2016-02-01 19:09:24 +00:00
SROA [SROA] Also insert a bit piece expression if only one piece is needed 2016-01-14 20:06:34 +00:00
SafeStack [safestack] Make sure the unsafe stack pointer is popped in all cases 2016-02-02 01:03:11 +00:00
SampleProfile SamplePGO - Add initial support for inliner annotations. 2015-11-27 23:14:51 +00:00
ScalarRepl Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
Scalarizer DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
SeparateConstOffsetFromGEP [SeparateConstOffsetFromGEP] sext(a)+sext(b) => sext(a+b) when a+b can't sign-overflow. 2015-08-14 02:02:05 +00:00
SimplifyCFG [SimplifyCFG] Fix for "endless" loop after dead code removal (Alternative to 2016-02-03 23:54:25 +00:00
Sink [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
SpeculativeExecution Add a speculative execution pass 2015-05-15 17:54:48 +00:00
StraightLineStrengthReduce [SeparateConstOffsetFromGEP] strengthen the inbounds attribute 2015-08-13 18:48:49 +00:00
StripDeadPrototypes [PM] Port StripDeadPrototypes to the new pass manager 2015-10-30 23:28:12 +00:00
StripSymbols DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
StructurizeCFG AMDGPU: Remove some old intrinsic uses from tests 2016-02-11 06:02:01 +00:00
TailCallElim Push isDereferenceableAndAlignedPointer down into isSafeToLoadUnconditionally 2016-01-17 12:35:29 +00:00
TailDup
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Util Make check line consistent 2016-02-07 20:57:46 +00:00
WholeProgramDevirt WholeProgramDevirt: introduce. 2016-02-09 22:50:34 +00:00