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authorAntia Puentes <[email protected]>2018-02-22 13:50:23 +0100
committerAlejandro Piñeiro <[email protected]>2018-07-03 12:41:46 +0200
commitfbcebfc5bf191f6018a8e17ca26e47cbfdf5e40c (patch)
tree983d0c4e763ada4aa9f806e57277bf3778fb132c /docs/utilities.html
parent6677e131b806b10754adcb7cf3f427a7fcc2aa09 (diff)
nir: Fix OpAtomicCounterIDecrement for uniform atomic counters
From the SPIR-V 1.0 specification, section 3.32.18, "Atomic Instructions": "OpAtomicIDecrement: <skip> The instruction's result is the Original Value." However, we were implementing it, for uniform atomic counters, as a pre-decrement operation, as was the one available from GLSL. Renamed the former nir intrinsic 'atomic_counter_dec*' to 'atomic_counter_pre_dec*' for clarification purposes, as it implements a pre-decrement operation as specified for GLSL. From GLSL 4.50 spec, section 8.10, "Atomic Counter Functions": "uint atomicCounterDecrement (atomic_uint c) Atomically 1. decrements the counter for c, and 2. returns the value resulting from the decrement operation. These two steps are done atomically with respect to the atomic counter functions in this table." Added a new nir intrinsic 'atomic_counter_post_dec*' which implements a post-decrement operation as required by SPIR-V. v2: (Timothy Arceri) * Add extra spec quotes on commit message * Use "post" instead "pos" to avoid confusion with "position" Signed-off-by: Antia Puentes <[email protected]> Signed-off-by: Alejandro Piñeiro <[email protected]> Reviewed-by: Timothy Arceri <[email protected]>
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