Make halide_type_t and halide_type_of constexpr #6340
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This allows us to do a bit more at compile time in some cases; e.g., we can more reliably collapse things like `t == halide_type_t(int, 8)` into `t.as_u32() == literal-integer`, avoiding temporaries. It also makes it tractable to to do a `switch` on a series of `halide_type_t`, since we can now use halide_type_t::as_u32() as a constexpr. There were a number of places that did this in an ad-hoc manner previously; I updated those, and also converted at least one more repeated-if clause into a switch. (TBH, I'm not sure if I'm wild about the syntax, though; it is a bit weedy to scan. Suggestions welcome.)
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Monday review ping |
abadams
reviewed
Oct 25, 2021
abadams
approved these changes
Oct 25, 2021
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This allows us to do a bit more at compile time in some cases; e.g., we can more reliably collapse things like
t == halide_type_t(int, 8)intot.as_u32() == literal-integer, avoiding temporaries.It also makes it tractable to to do a
switchon a series ofhalide_type_t, since we can now use halide_type_t::as_u32() as a constexpr. There were a number of places that did this in an ad-hoc manner previously; I updated those, and also converted at least one more repeated-if clause into a switch. (TBH, I'm not sure if I'm wild about the syntax, though; it is a bit weedy to scan. Suggestions welcome.)