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3fda684eb9
See the comments in the code for details. This patch emits the definition of the macro only when the first loop is encountered. This does make that first loop's code look a bit odd: it would be more natural to define the macro at the top of the file. (See the modified files in `naga/tests/out/msl`.) Rejected alternatives: - We could emit the macro definition unconditionally at the top of the file. But this changes every MSL snapshot output file, whereas only eight of them actually contain loops. - We could have the validator flag modules that contain loops. But the changes end up being not small, and spread across the validator, so this seems disproportionate. If we had other consumers of this information, it might make sense. - We could change the MSL backend to allow text to be generated out of order, so that we can decide whether to define the macro after we've generated all the function bodies. But at the moment this seems like unnecessary complexity, although it might be worth doing in the future if we had additional uses for it - say, to conditionally emit helper function definitions. Fixes #4972. |
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