Craig Topper d2fe411570 [InstCombine] Fold (a | b) ^ (~a | ~b) --> ~(a ^ b) and (a & b) ^ (~a & ~b) --> ~(a ^ b) ...

Summary:
I came across this while thinking about what would happen if one of the operands in this xor pattern was itself a inverted (A & ~B) ^ (~A & B)-> (A^B).

The patterns here assume that the (~a | ~b) will be demorganed to ~(a & b) first. Though I wonder if there's a multiple use case that would prevent the demorgan.

Reviewers: spatel

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34870

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306967 91177308-0d34-0410-b5e6-96231b3b80d8

2017-07-02 01:15:51 +00:00

..

ADCE

Fix a test to check assembly output instead of bitcode.

2017-03-31 23:22:19 +00:00

AddDiscriminators

[AddDiscriminators] Assign discriminators to MemIntrinsic calls.

2017-04-11 19:07:30 +00:00

AlignmentFromAssumptions

[PM] Port AlignmentFromAssumptions to the new PM.

2016-06-15 06:18:01 +00:00

ArgumentPromotion

[ArgPromotion] Add a testcase for PR32917

2017-05-05 08:40:24 +00:00

AtomicExpand

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

BDCE

[Analysis] Support bitreverse in -demanded-bits pass

2017-04-13 16:44:25 +00:00

BranchFolding

Move branch folding test to a better location.

2015-12-03 19:41:25 +00:00

CodeExtractor

Clean up a test case

2017-06-27 21:35:49 +00:00

CodeGenPrepare

[CodeGenPrepare] Don't create inttoptr for ni ptrs

2017-06-29 20:28:59 +00:00

ConstantHoisting

[ConstantHoisting] Avoid hoisting constants in GEPs that index into a struct type.

2017-06-29 17:03:34 +00:00

ConstantMerge

Don't merge global constants with non-dbg metadata.

2017-03-09 00:03:37 +00:00

ConstProp

[X86] Replace 'REQUIRES: x86' in tests with 'REQUIRES: x86-registered-target' which seems to be the correct way to make them run on an x86 build.

2017-06-04 08:21:58 +00:00

Coroutines

[coroutines] PR33271: Remove stray coro.save intrinsics during CoroSplit

2017-06-02 02:18:36 +00:00

CorrelatedValuePropagation

[LVI] Teach LVI to reason about ORs of icmps similar to how it reasons about ANDs of icmps

2017-06-23 01:08:16 +00:00

CountingFunctionInserter

Add a counter-function insertion pass

2016-09-01 09:42:39 +00:00

CrossDSOCFI

[cfi] CFI-ICall for ThinLTO.

2017-06-16 00:18:29 +00:00

DCE

[InstSimplify] Don't constant fold or DCE calls that are marked nobuiltin

2017-06-09 23:18:11 +00:00

DeadArgElim

Replace hardcoded intrinsic list with speculatable attribute.

2017-05-03 02:26:10 +00:00

DeadStoreElimination

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

EarlyCSE

[EarlyCSE] Make PhiToCheck in removeMSSA() a set.

2017-06-14 19:29:53 +00:00

EliminateAvailableExternally

[PM] Port EliminateAvailableExternally pass to the new pass manager.

2016-05-05 02:37:32 +00:00

Float2Int

[PM] Port float2int to the new pass manager

2016-06-24 23:32:02 +00:00

ForcedFunctionAttrs

[attrs] Split off the forced attributes utility into its own pass that

2015-12-27 08:13:45 +00:00

FunctionAttrs

Support arbitrary address space pointers in masked gather/scatter intrinsics.

2017-05-03 12:28:54 +00:00

FunctionImport

Revert r295861, "[ModuleSummaryAnalysis] Don't crash when referencing unnamed globals."

2017-05-03 00:18:48 +00:00

GCOVProfiling

[IR] Remove the DIExpression field from DIGlobalVariable.

2016-12-20 02:09:43 +00:00

GlobalDCE

[PM] Teach the PGO instrumentation pasess to run GlobalDCE before

2017-05-25 07:15:09 +00:00

GlobalMerge

Align definition of DW_OP_plus with DWARF spec [3/3]

2017-06-14 13:14:38 +00:00

GlobalOpt

[GlobalOpt] Correctly update metadata when localizing a global.

2017-04-27 18:39:08 +00:00

GlobalSplit

Fix one-after-the-end type metadata handling in globalsplit.

2017-03-07 22:18:48 +00:00

GuardWidening

[GuardWidening] Fix incorrect use of remove_if

2016-05-21 02:24:44 +00:00

GVN

[GVN] Recommit the patch "Add phi-translate support in scalarpre".

2017-06-26 18:16:10 +00:00

GVNHoist

Disable GVN Hoist due to still more bugs being found in it. There is

2017-04-27 00:28:03 +00:00

GVNSink

Changed a comparison operator for std::stable_sort to implement strict weak ordering.

2017-06-08 17:27:40 +00:00

IndVarSimplify

[SCEV] Make MulOpsInlineThreshold lower to avoid excessive compilation time

2017-06-21 07:28:13 +00:00

InferAddressSpaces

InferAddressSpaces: Avoid assertion failure with replacing identical

2017-06-08 13:20:55 +00:00

InferFunctionAttrs

Add argmononly attribute to strlen and wcslen, i.e. they only read memory (string) passed to them.

2017-06-18 03:10:26 +00:00

Inline

[Cloner] Re-map simplfied cloned instructions.

2017-07-01 03:29:33 +00:00

InstCombine

[InstCombine] Fold (a | b) ^ (~a | ~b) --> ~(a ^ b) and (a & b) ^ (~a & ~b) --> ~(a ^ b)

2017-07-02 01:15:51 +00:00

InstMerge

Remove the load hoisting code of MLSM, it is completely subsumed by GVNHoist

2017-01-24 19:55:36 +00:00

InstNamer

Add basic test case for -instnamer

2017-05-08 23:18:46 +00:00

InstSimplify

[InstSimplify] Constant fold the new GEP in SimplifyGEPInst.

2017-06-06 10:17:14 +00:00

InterleavedAccess

Fix the bug when handling shufflevector for aarch64.

2017-06-26 21:33:51 +00:00

Internalize

[Internalize] Test that __stack_chk_{guard, fail} are not internalized.

2016-06-05 19:08:54 +00:00

IPConstantProp

[IPCP] Don't propagate return value for naked functions.

2017-02-04 19:44:14 +00:00

IRCE

[IRCE] Canonicalize pre/post loops after the blocks are added into parent loop

2017-06-06 14:54:01 +00:00

JumpThreading

[JumpThreading] Add test case that was supposed to go with r306085.

2017-06-27 15:26:47 +00:00

LCSSA

Revert "Revert r275883 and r275891. They seem to cause PR28608."

2016-07-20 01:55:27 +00:00

LICM

[AliasSetTracker] Don't drop AA MD so eagerly

2017-06-29 19:13:11 +00:00

LoadStoreVectorizer

Skip bitcasts while looking for GEP in LoadStoreVectorizer

2017-04-25 18:00:08 +00:00

LoopDataPrefetch

[PM] Port LoopDataPrefetch AArch64 tests to new pass manager

2016-08-22 12:59:58 +00:00

LoopDeletion

[LoopDeletion] Update exits correctly when multiple duplicate edges from an exiting block

2017-06-22 20:20:56 +00:00

LoopDistribute

Move test of lazy BFI with ORE to a generic directory

2017-01-13 00:16:23 +00:00

LoopIdiom

[Atomics] Rename and change prototype for atomic memcpy intrinsic

2017-06-16 14:43:59 +00:00

LoopInterchange

[LoopInterchange] Track all dependencies, not just anti dependencies.

2016-09-21 19:16:47 +00:00

LoopLoadElim

[PM] Port LoopLoadElimination to the new pass manager and wire it into

2017-01-27 01:32:26 +00:00

LoopPredication

Loop predication expand both sides of the widened condition

2017-02-27 15:44:49 +00:00

LoopReroll

[LoopReroll] Make root-finding more aggressive.

2016-11-21 22:35:34 +00:00

LoopRotate

Restrict the definition of loop preheader to avoid EH blocks

2017-06-22 23:27:16 +00:00

LoopSimplify

[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.

2017-06-25 22:45:31 +00:00

LoopSimplifyCFG

LPM: Drop require<loops> from these tests, it's redundant. NFC

2016-05-10 18:28:10 +00:00

LoopStrengthReduce

Revert r304824 "Fix PR23384 (part 3 of 3)"

2017-06-19 17:57:15 +00:00

LoopUnroll

[RuntimeUnrolling] Add logic for loops with multiple exit blocks

2017-06-30 17:57:07 +00:00

LoopUnswitch

[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.

2017-06-25 22:45:31 +00:00

LoopVectorize

Revert "r306473 - re-commit r306336: Enable vectorizer-maximize-bandwidth by default."

2017-07-01 03:24:09 +00:00

LoopVersioning

[LAA] Correctly return a half-open range in expandBounds

2017-04-05 09:24:26 +00:00

LoopVersioningLICM

[LAA] Correctly return a half-open range in expandBounds

2017-04-05 09:24:26 +00:00

LowerAtomic

[PM] Port LowerAtomic to the new pass manager.

2016-05-13 22:52:35 +00:00

LowerExpectIntrinsic

Fix builin_expect lowering bug

2017-06-07 18:32:24 +00:00

LowerGuardIntrinsic

[PM] Port LowerGuardIntrinsic to the new PM.

2016-07-28 22:08:41 +00:00

LowerInvoke

[PM] Port LowerInvoke to the new pass manager

2016-08-12 17:28:27 +00:00

LowerSwitch

LowerSwitch: Fix producing invalid IR on unreachable code

2017-04-21 23:54:12 +00:00

LowerTypeTests

Fix ODR violations due to abuse of LLVM_YAML_IS_(FLOW_)?SEQUENCE_VECTOR

2017-06-30 20:56:57 +00:00

Mem2Reg

Add test coverage for mem2reg dbg.declare lowering.

2017-04-21 22:13:55 +00:00

MemCpyOpt

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

MergeFunc

MergeFunctions: Preserve debug info in thunks, under option -mergefunc-preserve-debug-info

2017-01-21 02:02:56 +00:00

MetaRenamer

[MetaRenamer] Don't rename library functions.

2017-03-23 23:21:07 +00:00

NameAnonGlobals

[ThinLTO] Ensure anonymous globals renamed even at -O0

2016-09-17 20:40:16 +00:00

NaryReassociate

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

NewGVN

NewGVN: Fix PR 33461, caused by slightly overzealous verification.

2017-06-19 00:24:00 +00:00

ObjCARC

Replace hardcoded intrinsic list with speculatable attribute.

2017-05-03 02:26:10 +00:00

PartiallyInlineLibCalls

Add positive test for sqrt "partial inlining". NFC.

2017-01-04 21:24:56 +00:00

PGOProfile

[PGO] Implementate profile counter regiser promotion

2017-06-25 00:26:43 +00:00

PhaseOrdering

Make globalaa-retained.ll test catching more cases.

2017-04-18 13:29:26 +00:00

PlaceSafepoints

[PlaceSafepoints] Don't call undef in test case; NFC

2016-06-25 01:40:54 +00:00

PreISelIntrinsicLowering

[PM] Port PreISelIntrinsicLowering to the new PM

2016-06-24 20:13:42 +00:00

PruneEH

[PruneEH] Be correct in the face IPO

2016-10-03 19:35:30 +00:00

Reassociate

[Reassociate] Make sure EraseInst sets MadeChange

2017-06-27 05:32:13 +00:00

Reg2Mem

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

RewriteStatepointsForGC

[RS4GC] Drop invalid metadata after pointers are relocated

2017-06-12 21:26:53 +00:00

SafeStack

Align definition of DW_OP_plus with DWARF spec [3/3]

2017-06-14 13:14:38 +00:00

SampleProfile

Do not inline recursive direct calls in sample loader pass.

2017-06-21 17:57:43 +00:00

Scalarizer

[Scalarizer] Handle scalar arguments in vector GEP

2017-03-31 06:29:49 +00:00

SCCP

[SCCP] Resolve indirect branch target when possible.

2017-04-10 00:33:25 +00:00

SeparateConstOffsetFromGEP

AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel

2017-03-21 21:39:51 +00:00

SimpleLoopUnswitch

[PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch

2017-05-25 06:33:36 +00:00

SimplifyCFG

[Hexagon] Guard the generation of lookup table

2017-06-30 20:54:24 +00:00

Sink

[Sink] Fix predicate in legality check

2017-06-09 19:31:10 +00:00

SLPVectorizer

[SLP] A test for limiting vectorization of instructions, NFC.

2017-06-30 14:37:32 +00:00

SpeculativeExecution

Revert r301950: SpeculativeExecution: Stop using whitelist for costs

2017-05-10 12:30:07 +00:00

SROA

[SROA] Fix APInt size when alloca address space is not 0

2017-06-27 18:26:06 +00:00

StraightLineStrengthReduce

AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel

2017-03-21 21:39:51 +00:00

StripDeadPrototypes

[PM] Port StripDeadPrototypes to the new pass manager

2015-10-30 23:28:12 +00:00

StripSymbols

[StripDeadDebug/DIFinder] Track inlined SPs

2017-04-11 13:32:11 +00:00

StructurizeCFG

Revert "StructurizeCFG: Directly invert cmp instructions"

2017-04-24 20:25:01 +00:00

TailCallElim

[TRE] Improve code motion in TRE, use AA to tell whether a load can be moved before a call that writes to memory.

2017-06-19 15:21:18 +00:00

ThinLTOBitcodeWriter

Write summaries for merged modules when splitting modules for ThinLTO.

2017-06-08 23:01:49 +00:00

Util

PredicateInfo: Don't insert conditional info when a conditional branch jumps to the same target regardless of condition

2017-06-14 21:19:52 +00:00

WholeProgramDevirt

Skip CFI for dead functions.

2017-06-02 18:24:23 +00:00