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Document WebGPU edge case behaviour of bitfield operations #33

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dneto0 opened this issue Jun 22, 2019 · 0 comments

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dneto0 commented Jun 22, 2019

From gpuweb/gpuweb#288

Implementation behaviour edge cases for OpBitFieldSExtract, OpBitFieldUExtract and OpBitFieldInsert are:

Clamp Offset to [0,31] (make the bit width in bounds)
Clamp Count such that clamped_offset + count is within [0,31].
When inserting, only the clamped_count least significant bits are used.
When extracting, only the clamped_count least significant bits are returned

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