Jay Foad f7684d8510 [DAG] Use legal shift amount type in DAGTypeLegalizer::JoinIntegers ...

Documentation for TargetLowering::getShiftAmountTy says that LegalTypes
should generally be true during type legalization, so this patch does
that.

On AMDGPU the effect is that we use i32 (a sane type) instead of i64
(pointer sized type) for more shift amounts, which in turn allows more
formation of rotates and funnel shifts pre-legalization.

Differential Revision: https://reviews.llvm.org/D154960

2023-07-12 08:12:09 +01:00

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