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4 Commits

Author SHA1 Message Date
Simon Pilgrim 546d002d7a [GlobalISel] ComputeKnownBits - use common KnownBits shift handling (PR44526) 
Convert GISelKnownBits.computeKnownBitsImpl shift handling to use the common KnownBits implementations, which makes use of the known leading/trailing bits for shifted values in cases where we don't know the shift amount value, as detailed in https://blog.regehr.org/archives/1709

Differential Revision: https://reviews.llvm.org/D90527
 2020-11-05 11:52:26 +00:00
Matt Arsenault 201f770f16 GlobalISel: Add and_trivial_mask to all_combines 
Also make up a new category of combines.
 2020-08-27 16:42:09 -04:00
Matt Arsenault 5819159995 AMDGPU/GlobalISel: Pack constant G_BUILD_VECTOR_TRUNCs when selecting 2020-07-26 09:55:34 -04:00
Matt Arsenault 96819011ca AMDGPU/GlobalISel: Fix RegBankSelect for v2s16 shifts 
These need to be promoted and scalarized for the SALU.
 2020-04-11 20:55:33 -04:00