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479a57ca4a
llvm-mirror/test/Transforms
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Sanjoy Das 479a57ca4a New pass: guard widening 
Summary:
Implement guard widening in LLVM. Description from GuardWidening.cpp:

The semantics of the `@llvm.experimental.guard` intrinsic lets LLVM
transform it so that it fails more often that it did before the
transform.  This optimization is called "widening" and can be used hoist
and common runtime checks in situations like these:

```
%cmp0 = 7 u< Length
call @llvm.experimental.guard(i1 %cmp0) [ "deopt"(...) ]
call @unknown_side_effects()
%cmp1 = 9 u< Length
call @llvm.experimental.guard(i1 %cmp1) [ "deopt"(...) ]
...
```

to

```
%cmp0 = 9 u< Length
call @llvm.experimental.guard(i1 %cmp0) [ "deopt"(...) ]
call @unknown_side_effects()
...
```

If `%cmp0` is false, `@llvm.experimental.guard` will "deoptimize" back
to a generic implementation of the same function, which will have the
correct semantics from that point onward.  It is always _legal_ to
deoptimize (so replacing `%cmp0` with false is "correct"), though it may
not always be profitable to do so.

NB! This pass is a work in progress.  It hasn't been tuned to be
"production ready" yet.  It is known to have quadriatic running time and
will not scale to large numbers of guards

Reviewers: reames, atrick, bogner, apilipenko, nlewycky

Subscribers: mcrosier, llvm-commits

Differential Revision: http://reviews.llvm.org/D20143

llvm-svn: 269997
2016-05-18 22:55:34 +00:00
..
ADCE [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
AddDiscriminators Revert http://reviews.llvm.org/D19926 as it breaks tests. 2016-05-05 20:47:53 +00:00
AlignmentFromAssumptions
ArgumentPromotion [ArgumentPromotion] Propagate operand bundles to promoted call sites 2016-04-29 04:56:12 +00:00
AtomicExpand ARM: use a pseudo-instruction for cmpxchg at -O0. 2016-04-18 21:48:55 +00:00
BBVectorize
BDCE
BranchFolding
CodeExtractor
CodeGenPrepare [CodeGenPrepare] Don't sink a cast past its user 2016-04-27 19:36:38 +00:00
ConstantHoisting ARM: don't try to hoist constant RHS out of a division. 2016-04-15 18:17:18 +00:00
ConstantMerge [PM] Port ConstantMerge to the new pass manager. 2016-05-05 00:51:09 +00:00
ConstProp Revert "[SCCP] Partially propagate informations when the input is not fully defined." 2016-05-11 23:06:10 +00:00
CorrelatedValuePropagation Remove extra whitespace. NFC. 2016-05-02 16:45:00 +00:00
CrossDSOCFI
DCE Mark guards on true as "trivially dead" 2016-04-29 22:23:16 +00:00
DeadArgElim [DeadArgumentElimination] Propagate operand bundles to promoted call sites 2016-04-29 07:22:36 +00:00
DeadStoreElimination [PM] Port DSE to the new pass manager 2016-05-17 21:38:13 +00:00
EarlyCSE [EarlyCSE] Simplify guard intrinsics 2016-04-29 21:52:58 +00:00
EliminateAvailableExternally [PM] Port EliminateAvailableExternally pass to the new pass manager. 2016-05-05 02:37:32 +00:00
Float2Int
ForcedFunctionAttrs
FunctionAttrs Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
FunctionImport ThinLTO: do not import function whose linkage prevents inlining. 2016-05-03 00:27:28 +00:00
GCOVProfiling DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
GlobalDCE [GlobalDCE, Misc] Don't remove functions referenced by ifuncs 2016-05-04 00:20:48 +00:00
GlobalOpt Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
GuardWidening New pass: guard widening 2016-05-18 22:55:34 +00:00
GVN [GVN] PRE of unordered loads 2016-05-06 21:43:51 +00:00
IndVarSimplify [LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC. 2016-04-19 23:51:52 +00:00
InferFunctionAttrs [InferAttrs] Mark memset_pattern16 params nocapture. 2016-04-27 19:04:43 +00:00
Inline All llvm.deoptimize declarations must use the same calling convention 2016-05-12 01:17:38 +00:00
InstCombine [InstCombine] add another test for wrong icmp constant (PR27792) 2016-05-17 20:20:40 +00:00
InstMerge
InstSimplify Vector GEP - fixed a crash on InstSimplify Pass. 2016-05-15 12:30:25 +00:00
Internalize PM: Port Internalize to the new pass manager 2016-04-26 20:15:52 +00:00
IPConstantProp [PM] Port Interprocedural SCCP to the new pass manager. 2016-05-05 21:05:36 +00:00
IRCE
JumpThreading [ValueTracking] Improve isImpliedCondition when the dominating cond is false. 2016-04-25 17:23:36 +00:00
LCSSA
LICM [ValueTracking] Use guards to prove non-nullness of a value 2016-05-10 02:35:44 +00:00
LoadCombine
LoopDataPrefetch [LoopDataPrefetch] Add optimization remark 2016-05-05 00:08:15 +00:00
LoopDeletion Use all_of instead of a raw loop; NFC 2016-05-03 17:50:06 +00:00
LoopDistribute [LoopDist] Add missing RUN line in test from r268006 2016-04-29 07:16:00 +00:00
LoopIdiom AMDGPU: Other sizes of popcnt are fast 2016-05-18 16:10:19 +00:00
LoopInterchange
LoopLoadElim
LoopReroll Enable loopreroll for sext of loop control only IV 2016-05-10 21:16:49 +00:00
LoopRotate LPM: Drop require<loops> from these tests, it's redundant. NFC 2016-05-10 18:28:10 +00:00
LoopSimplify [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopSimplifyCFG LPM: Drop require<loops> from these tests, it's redundant. NFC 2016-05-10 18:28:10 +00:00
LoopStrengthReduce AMDGPU: Fix a few slightly broken tests 2016-05-18 15:48:44 +00:00
LoopUnroll [LoopUnrollAnalyzer] Take into account cost of instructions controlling branches, along with their operands. 2016-05-18 21:20:12 +00:00
LoopUnswitch
LoopVectorize [LAA] Rename forwarding conflict detection option (NFC) 2016-05-16 17:00:56 +00:00
LoopVersioning
LoopVersioningLICM [LoopVersioningLICM] Add test coverage for llvm.loop.licm_versioning.disable 2016-04-22 18:34:50 +00:00
LowerAtomic [PM] Port LowerAtomic to the new pass manager. 2016-05-13 22:52:35 +00:00
LowerBitSets [cfi] Support explicit sections for functions in cfi-icall. 2016-04-15 22:55:38 +00:00
LowerExpectIntrinsic [LowerExpectIntrinsic] make default likely/unlikely ratio bigger 2016-04-26 22:23:38 +00:00
LowerGuardIntrinsic [Guards] Add branch metadata when lowering 2016-05-17 17:51:19 +00:00
LowerInvoke
LowerSwitch
Mem2Reg [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
MemCpyOpt [MemCpyOpt] Use MaxIntSize in byte instead of bit 2016-05-13 16:52:24 +00:00
MergeFunc MergeFunctions: test alloca better 2016-04-12 00:03:26 +00:00
MetaRenamer
NameAnonFunctions Add a pass to name anonymous/nameless function 2016-04-12 21:35:28 +00:00
NaryReassociate
ObjCARC [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
PartiallyInlineLibCalls
PGOProfile [PM] Port indirect call promotion pass to new pass manager 2016-05-16 16:31:07 +00:00
PhaseOrdering Mark that SpeculativeExecution preserves Globals Alias Analysis. 2016-05-03 08:33:26 +00:00
PlaceSafepoints
PreISelIntrinsicLowering Introduce llvm.load.relative intrinsic. 2016-04-22 21:18:02 +00:00
PruneEH
Reassociate PM: Port Reassociate to the new pass manager 2016-04-26 23:39:29 +00:00
Reg2Mem
RewriteStatepointsForGC [RewriteStatepointsForGC] Remove obsolete assertion 2016-05-17 13:54:10 +00:00
SafeStack DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
SampleProfile Tune basic block annotation algorithm. 2016-04-26 04:59:11 +00:00
Scalarizer [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
ScalarRepl [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SCCP [PM] Port per-function SCCP to the new pass manager. 2016-05-18 15:18:25 +00:00
SeparateConstOffsetFromGEP
SimplifyCFG Follow-up patch of http://reviews.llvm.org/D19948 to handle missing profiles when simplifying CFG. 2016-05-18 22:41:03 +00:00
Sink PM: Port SinkingPass to the new pass manager 2016-04-22 19:54:10 +00:00
SLPVectorizer [SLPVectorizer][X86] Regenerated SEXT/ZEXT cast vectorization tests 2016-05-06 22:22:18 +00:00
SpeculativeExecution Move divergent-target test into CodeGen/NVPTX because it requires an NVPTX target. 2016-04-15 01:20:52 +00:00
SROA [SROA] Function canConvertValue needs to check whether both NewTy and OldTy pointers are 2016-05-03 19:30:48 +00:00
StraightLineStrengthReduce
StripDeadPrototypes
StripSymbols Refactor stripDebugInfo(Function) to handle intrinsic 2016-05-07 04:10:52 +00:00
StructurizeCFG AMDGPU: Remove leftover ShaderType attributes in tests 2016-04-13 00:39:48 +00:00
TailCallElim
Util [BasicAA] Treat llvm.assume as not accessing memory in getModRefBehavior(Function) 2016-04-29 17:18:28 +00:00
WholeProgramDevirt