Optimised copy for mod #343
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Aelphy
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dsharlet
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May 22, 2024
builder/optimizations.cc
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| const bool is_unfolded = | ||
| !src_dim.fold_factor.defined() || | ||
| src_dim.fold_factor.same_as(dim::unfolded); | ||
| if (depends_on(m->a, dst_x).any() && !depends_on(m->b, dst_x).any() && |
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Nit: put the is_unfolded first in the condition (short circuit the relatively expensive depends_on checks)
dsharlet
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May 22, 2024
| var x(ctx, "x"); | ||
| var y(ctx, "y"); | ||
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| const int kMod = 23; |
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This is too big to test the functionality, all of the copy fits in the first fold. I'd make this 3.
builder/optimizations.cc
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| const bool is_unfolded = | ||
| !src_dim.fold_factor.defined() || | ||
| src_dim.fold_factor.same_as(dim::unfolded); | ||
| if (depends_on(m->a, dst_x).any() && !depends_on(m->b, dst_x).any() && |
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I think you only need the depends_on check for m->b, not m->a. If that doesn't depend on a, we should have treated this as a broadcast.
| // Try to parse src_x = dst_x % fold_factor | ||
| if (const class mod* m = src_x.as<class mod>()) { | ||
| const bool is_unfolded = | ||
| !src_dim.fold_factor.defined() || |
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I don't think all of the callers set this now, it just starts out undefined. Thinking about this, this is quite tricky. We might need to track fold factors in the visitor so we can know what they are.
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Addresses #306