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aco: Implement subgroup shuffle in GFX10 wave64 mode.

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Previously subgroup shuffle was implemented using the bpermute
instruction, which only works accross half-waves, so by itself it's
not suitable for implementing subgroup shuffle when the shader is
running in wave64 mode.

This commit adds a trick using shared VGPRs that allows to implement
subgroup shuffle still relatively effectively in this mode.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
This commit is contained in:
Timur Kristóf
2019-09-21 18:03:56 +02:00
committed by Rhys Perry
parent c2eebfe3ea
commit d59f702e26
6 changed files with 113 additions and 16 deletions
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src/amd/compiler/aco_builder_h.py
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@@ -358,7 +358,7 @@ formats = [("pseudo", [Format.PSEUDO], 'Pseudo_instruction', list(itertools.prod
("exp", [Format.EXP], 'Export_instruction', [(0, 4)]),
("branch", [Format.PSEUDO_BRANCH], 'Pseudo_branch_instruction', itertools.product([0], [0, 1])),
("barrier", [Format.PSEUDO_BARRIER], 'Pseudo_barrier_instruction', [(0, 0)]),
("reduction", [Format.PSEUDO_REDUCTION], 'Pseudo_reduction_instruction', [(3, 2)]),
("reduction", [Format.PSEUDO_REDUCTION], 'Pseudo_reduction_instruction', [(3, 2), (3, 4)]),
("vop1", [Format.VOP1], 'VOP1_instruction', [(1, 1), (2, 2)]),
("vop2", [Format.VOP2], 'VOP2_instruction', itertools.product([1, 2], [2, 3])),
("vopc", [Format.VOPC], 'VOPC_instruction', itertools.product([1, 2], [2])),