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Sander de Smalen 4ca860742d [InstructionCost] Don't conflate Invalid costs with Unknown costs. 
We previously made a change to getUserCost to return a Invalid cost
when one of the TTI costs returned '-1' (meaning 'unknown' or
'infinitely expensive'). It makes no sense to say that:

  shufflevector <2 x i8> %x, <2 x i8> %y, <4 x i32> <i32 0, i32 1, i32 2, i32 3>

has an invalid cost. Perhaps the cost is not known, but the IR is valid
and can be code-generated. Invalid should only be used for IR that
cannot possibly be code-generated and where a cost is nonsensical.

With more passes now asserting that the cost must be valid, it is possible
that those assertions will fail for perfectly valid IR. An incomplete
cost-model probably shouldn't be a reason for the compiler to break.

It's better to consider these costs as 'very expensive' and ignore them
for other reasons. At some point, we should consider replacing -1 with
some other mechanism.

Reviewed By: paulwalker-arm, dmgreen

Differential Revision: https://reviews.llvm.org/D99502
 		2021-03-30 09:29:42 +01:00
..
AliasSet [noalias.decl] Look through llvm.experimental.noalias.scope.decl 2021-01-19 20:09:42 +01:00
AssumptionCache Revert "[AssumptionCache] Avoid dangling llvm.assume calls in the cache" 2021-02-11 12:17:38 -06:00
BasicAA [BasicAA] Make sure types match in constant offset heuristic 2021-03-28 21:38:09 +02:00
BlockFrequencyInfo [BPI] Improve static heuristics for "cold" paths. 2020-12-23 22:47:36 +07:00
BranchProbabilityInfo [test] Pin some tests to legacy PM 2020-12-26 13:46:02 -08:00
CFLAliasAnalysis [BasicAA] Rename -disable-basicaa to -disable-basic-aa to be consistent with the canonical name "basic-aa" 2020-06-26 20:55:44 -07:00
CallGraph Option to ignore llvm[.compiler].used uses in hasAddressTaken() 2021-02-25 10:06:24 -08:00
CostModel [InstructionCost] Don't conflate Invalid costs with Unknown costs. 2021-03-30 09:29:42 +01:00
DDG Fix print-dot-ddg.ll so it doesn't try to write to the source tree (& uses the test temp paths instead) 2021-01-07 19:57:14 -08:00
Delinearization [Delinearization][NewPM] Port delinearization to NPM 2020-09-21 17:59:08 -07:00
DemandedBits Precommit analysis/etc tests for inselt poison placeholder 2020-12-24 12:14:24 +09:00
DependenceAnalysis [DependenceAnalysis][NewPM] Fix tests to work under NPM 2020-09-15 11:11:23 -07:00
DivergenceAnalysis [NewPM] Introduce (GPU)DivergenceAnalysis in the new pass manager 2021-02-16 10:26:45 +05:30
DominanceFrontier
…
Dominators [Dominators][NewPM] Pin tests with -analyze to legacy PM 2020-09-15 11:59:00 -07:00
FunctionPropertiesAnalysis Add new function properties to FunctionPropertiesAnalysis 2020-07-23 12:46:47 -07:00
GlobalsModRef [GlobalsAA] Teach to handle `addrspacecast`. 2020-11-09 00:04:52 -05:00
IRSimilarityIdentifier [IROutliner] Adding instruction strings to IRSimilarityPrinting diagnostics. 2021-02-09 12:11:47 -06:00
IVUsers [SCEV] Strenthen nowrap flags after constant folding for mul exprs 2020-10-25 19:43:58 +01:00
LazyCallGraph [LazyCallGraph] Build SCCs of the reference graph in order 2020-11-02 13:22:42 -08:00
LazyValueAnalysis [JumpThreading] Make -print-lvi-after-jump-threading work with NPM 2020-11-17 23:15:20 -08:00
LegacyDivergenceAnalysis [NewPM] Introduce (GPU)DivergenceAnalysis in the new pass manager 2021-02-16 10:26:45 +05:30
Lint OpaquePtr: Update more tests to use typed sret 2020-11-20 20:08:43 -05:00
LoopAccessAnalysis [llvm][NFC] Disallow all warnings in TypeSize tests 2021-01-06 17:17:07 +00:00
LoopCacheAnalysis/PowerPC
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LoopInfo [LoopInfo][NewPM] Fix tests in Analysis/LoopInfo under NPM 2020-09-22 11:31:00 -07:00
LoopNestAnalysis [LoopNest] Use `getUniqueSuccessor()` instead when checking empty blocks 2021-02-24 09:53:12 +08:00
MemoryDependenceAnalysis OpaquePtr: Update more tests to use typed sret 2020-11-20 20:08:43 -05:00
MemorySSA [MemorySSA] Don't treat lifetime.end as NoAlias 2021-02-04 20:58:28 +01:00
MustExecute Port print-must-be-executed-contexts and print-mustexecute to NPM 2020-11-03 21:06:46 -08:00
PhiValues
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PostDominators [PostDominators][NewPM] Fix tests to work under NPM 2020-09-15 11:19:01 -07:00
ProfileSummary
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RegionInfo [RegionInfo][NewPM] Fix RegionInfo tests to work under NPM 2020-09-15 11:12:14 -07:00
ScalarEvolution [SCEV] Improve handling of not expressions in isImpliedCond() 2021-03-24 21:53:02 +01:00
ScopedNoAliasAA [MemCpyOpt] Correctly merge alias scopes during call slot optimization 2020-12-03 09:23:37 -08:00
StackSafetyAnalysis [SCEV] Use both known bits and sign bits when computing range of SCEV unknowns 2021-02-19 08:29:12 -08:00
TypeBasedAliasAnalysis Reland "[Libcalls, Attrs] Annotate libcalls with noundef" 2021-02-20 06:18:48 +01:00
ValueTracking [ValueTracking] Handle shl pair in isKnownNonEqual() 2021-03-26 20:21:05 +01:00
alias-analysis-uses.ll [NewPM] Pin tests with -debug-pass to legacy PM 2020-09-22 17:54:25 -07:00