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authorJason Ekstrand <[email protected]>2016-12-19 13:11:43 -0800
committerJason Ekstrand <[email protected]>2016-12-22 16:27:19 -0800
commit6d9f576b56e53e26315aa589c72f399dc29e9672 (patch)
tree6df8f9dd89f4e254cc0aef4070ddb5eb6a1a44c9 /.dir-locals.el
parent1111a05f90e27e9820dd187be16ae41335db6838 (diff)
nir: Add a pass for moving SPIR-V continue blocks to the ends of loops
When shaders come in from SPIR-V, we handle continue blocks by placing the contents of the continue inside of a "if (!first_iteration)". We do this so that we can properly handle the fact that continues in SPIR-V jump to the continue block at the end of the loop rather than jumping directly to the top of the loop like they do in NIR. In particular, the increment step of a simple for loop ends up in the continue block. This pass looks for this case in loops that don't actually have any continues and moves the continue contents to the end of the loop instead. We need this because loop unrolling doesn't work if the increment is inside of a condition. Reviewed-by: Timothy Arceri <[email protected]>
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