Make gpu thread and block for loop names opaque #8133
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This is one of our largest remaining type of magic name. These were explicitly constructed in lots of places and then explicitly checked for with ends_with in lots of places. This PR makes the names opaque. Only CanonicalizeGPUVars.cpp knows what they are, and they don't have to be a single fixed thing as long as they're consistent within a process. Also reduced the number of GPU dimensions to three more uniformly. We were already asserting this, but there was lots of dead code in lowering passes after gpu loop validation that allowed for four. Also fixed a bug I found in is_block_uniform. It didn't consider that the dependence on a gpu thread variable in a load index could be because a let variable encountered depends on a gpu thread variable.
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Tagging @derek-gerstmann for review for this one because I made non-trivial changes to the vulkan backend. |
derek-gerstmann
approved these changes
Mar 4, 2024
| @@ -203,7 +204,7 @@ class ReplaceForWithIf : public IRMutator { | |||
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| Stmt body = mutate(op->body); | |||
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| Expr var = Variable::make(Int(32), "." + thread_names[dim]); | |||
| Expr var = Variable::make(Int(32), gpu_thread_name(dim)); | |||
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Should this be a UInt(32) ?
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I don't think so. Our loop variables are currently always Int(32).
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This is one of our largest remaining type of magic name. These were explicitly constructed in lots of places and then explicitly checked for with ends_with in lots of places.
This PR makes the names opaque. Only CanonicalizeGPUVars.cpp knows what they are, and they don't have to be a single fixed thing as long as they're consistent within a process.
Also reduced the number of GPU dimensions to three more uniformly. We were already asserting this, but there was lots of dead code in lowering passes after gpu loop validation that allowed for four.
Also fixed a bug I found in is_block_uniform. It didn't consider that the dependence on a gpu thread variable in a load index could be because a let variable encountered depends on a gpu thread variable.