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Inject clamps around func calls h(...) when all the following conditions hold: 1. The call is in an indexing context, such as: f(x) = g(h(x)); 2. The schedule for f uses RoundUp or ShiftInwards 3. h is not compute_at within f's produce node 4. The FuncValueBounds of h are smaller than those of its type Conditions (3) and (4) are not yet implemented.
abadams
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Oct 7, 2021
abadams
reviewed
Oct 7, 2021
abadams
reviewed
Oct 7, 2021
abadams
reviewed
Oct 7, 2021
abadams
reviewed
Oct 7, 2021
abadams
reviewed
Oct 7, 2021
| if (is_inside_indexing) { | ||
| auto bounds = func_bounds.at({call->name, call->value_index}); | ||
| if (bounds_smaller_than_type(bounds, call->type)) { | ||
| // TODO: check that the clamped function's allocation bounds might be wider than its compute bounds |
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Oh, I figured this PR was blocked on implementing this.
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It fixes a miscompilation. I think we can live with a few extra ops instead in the short term.
abadams
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Oct 7, 2021
| // TODO(#6297): check that the clamped function's allocation bounds might be wider than its compute bounds | ||
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| auto [new_args, changed] = mutate_with_changes(call->args); | ||
| Expr new_call = changed ? call : Call::make(call->type, call->name, new_args, call->call_type, call->func, call->value_index, call->image, call->param); |
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(resurrecting a zombie PR...)
Uh, is this right? Shouldn't it be !changed ? call : ... ?
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Yeeeep, that looks like a typo. Want to try changing it to see if tests fail?
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Inject clamps around func calls h(...) when all the following conditions hold:
Fixes #6131