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llvm-project/llvm/test/Transforms
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Sanjay Patel 70b36f193d [CGP] eliminate a sub instruction in memcmp expansion 
As noted in D34071, there are some IR optimization opportunities that could be 
handled by normal IR passes if this expansion wasn't happening so late in CGP.

Regardless of that, it seems wasteful to knowingly produce suboptimal IR here, 
so I'm proposing this change:
  %s = sub i32 %x, %y
  %r = icmp ne %s, 0
    =>
  %r = icmp ne %x, %y

Changing the predicate to 'eq' mimics what InstCombine would do, so that's just
an efficiency improvement if we decide this expansion should happen sooner.

The fact that the PowerPC backend doesn't eliminate the 'subf.' might be 
something for PPC folks to investigate separately.

Differential Revision: https://reviews.llvm.org/D34416

llvm-svn: 306471
 		2017-06-27 21:46:34 +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
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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
BBVectorize Replace hardcoded intrinsic list with speculatable attribute. 2017-05-03 02:26:10 +00:00
BDCE [Analysis] Support bitreverse in -demanded-bits pass 2017-04-13 16:44:25 +00:00
BranchFolding
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CodeExtractor Clean up a test case 2017-06-27 21:35:49 +00:00
CodeGenPrepare [CGP] eliminate a sub instruction in memcmp expansion 2017-06-27 21:46:34 +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
ConstantHoisting [ConstHoisting] Add BFI in constanthoisting pass and select the best insertion 2017-04-21 15:50:16 +00:00
ConstantMerge Don't merge global constants with non-dbg metadata. 2017-03-09 00:03:37 +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
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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
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Float2Int
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ForcedFunctionAttrs
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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
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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
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
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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
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 [InlineCost] Do not take INT_MAX when Cost is negative 2017-06-23 16:12:37 +00:00
InstCombine [InstCombine] Propagate nsw flag when turning mul by pow2 into shift when the constant is a vector splat or the scalar bit width is larger than 64-bits 2017-06-27 19:57:53 +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
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JumpThreading [JumpThreading] Add test case that was supposed to go with r306085. 2017-06-27 15:26:47 +00:00
LCSSA
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LICM 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
LoadStoreVectorizer Skip bitcasts while looking for GEP in LoadStoreVectorizer 2017-04-25 18:00:08 +00:00
LoopDataPrefetch
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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
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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
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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
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LoopStrengthReduce Revert r304824 "Fix PR23384 (part 3 of 3)" 2017-06-19 17:57:15 +00:00
LoopUnroll [LoopUnroll] Fix a test. REQUIRE should be REQUIRES. 2017-05-12 15:30:58 +00:00
LoopUnswitch [LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr. 2017-06-25 22:45:31 +00:00
LoopVectorize [InstCombine] canonicalize icmp predicate feeding select 2017-06-27 17:53:22 +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
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LowerExpectIntrinsic Fix builin_expect lowering bug 2017-06-07 18:32:24 +00:00
LowerGuardIntrinsic
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LowerInvoke
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LowerSwitch LowerSwitch: Fix producing invalid IR on unreachable code 2017-04-21 23:54:12 +00:00
LowerTypeTests Change YAML traits for vector<string> to flow_vector. 2017-06-16 20:50:41 +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
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NaryReassociate
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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
PGOProfile [PGO] Implementate profile counter regiser promotion 2017-06-25 00:26:43 +00:00
PartiallyInlineLibCalls
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PhaseOrdering Make globalaa-retained.ll test catching more cases. 2017-04-18 13:29:26 +00:00
PlaceSafepoints
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PreISelIntrinsicLowering
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PruneEH
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Reassociate [Reassociate] Make sure EraseInst sets MadeChange 2017-06-27 05:32:13 +00:00
Reg2Mem
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RewriteStatepointsForGC [RS4GC] Drop invalid metadata after pointers are relocated 2017-06-12 21:26:53 +00:00
SCCP [SCCP] Resolve indirect branch target when possible. 2017-04-10 00:33:25 +00:00
SLPVectorizer AMDGPU: Allow vectorization of packed types 2017-06-20 20:38:06 +00:00
SROA [SROA] Fix APInt size when alloca address space is not 0 2017-06-27 18:26:06 +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
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 [ValueTracking] Teach isSafeToSpeculativelyExecute() about the speculatable attribute 2017-04-28 21:13:09 +00:00
Sink [Sink] Fix predicate in legality check 2017-06-09 19:31:10 +00:00
SpeculativeExecution Revert r301950: SpeculativeExecution: Stop using whitelist for costs 2017-05-10 12:30:07 +00:00
StraightLineStrengthReduce AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel 2017-03-21 21:39:51 +00:00
StripDeadPrototypes
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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