| Issue |
145335
|
| Summary |
[CostModel] TargetTransformInfoImplCRTPBase.getInstructionCost - move shuffle analysis into improveShuffleKindFromMask / target getShuffleCost
|
| Labels |
llvm:analysis
|
| Assignees |
|
| Reporter |
RKSimon
|
As discussed on #144690 and #141634 - we're making too many assumptions about how length changing shuffles are legalized by the target. These need to be driven by the actual target implementations.
Additionally - like getInstructionCost - improveShuffleKindFromMask needs to be able to recognize a SK_PermuteSingleSrc class shuffle that has been miss-tagged as a SK_PermuteTwoSrc class.
CC @davemgreen @preames
https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h#L1527-L1547
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