fb54fec726
This patch adds a pass '-allocate-sme-tiles' to the ArmSME dialect that implements allocation of SME ZA tiles. It does this at the 'func.func' op level by replacing 'arm_sme.get_tile_id' ops with 'arith.constant' ops that represent the tile number. The tiles in use in a given function are tracked by an integer function attribute 'arm_sme.tiles_in_use' that is a 16-bit tile mask with a bit for each 128-bit element tile (ZA0.Q-ZA15.Q), the smallest ZA tile granule. This is initialized on the first 'arm_sme.get_tile_id' rewrite and updated on each subsequent rewrite. Mixing of different element tile types is supported. Section B2.3.2 of the SME spec [1] describes how the 128-bit element tiles overlap with other element tiles. Depends on D154941 [1] https://developer.arm.com/documentation/ddi0616/aa Reviewed By: awarzynski Differential Revision: https://reviews.llvm.org/D154955
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