Push struct.new down to make it more likely that heap stores can be optimized.
#6584
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@gkdn Reproed the case with the string constructor that had some inline code that prevented the |
kripken
reviewed
May 13, 2024
kripken
reviewed
May 14, 2024
kripken
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May 15, 2024
src/passes/OptimizeInstructions.cpp
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| auto* tmp = list[i]; | ||
| list[i] = list[j]; | ||
| list[j] = tmp; |
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| auto* tmp = list[i]; | |
| list[i] = list[j]; | |
| list[j] = tmp; | |
| std::swap(list[i], list[j]); |
kripken
reviewed
May 21, 2024
| @@ -1,5 +1,5 @@ | |||
| ;; NOTE: Assertions have been generated by update_lit_checks.py and should not be edited. | |||
| ;; RUN: wasm-opt %s --remove-unused-names --optimize-instructions -all -S -o - \ | |||
| ;; RUN: wasm-opt %s --remove-unused-names --optimize-instructions -all -S -o - \ | |||
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unneeded space?
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| ;; RUN: wasm-opt %s --remove-unused-names --optimize-instructions -all -S -o - \ | |
| ;; RUN: wasm-opt %s --remove-unused-names --optimize-instructions -all -S -o - \ |
| (nop) | ||
| ;; |
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| ;; | |
| ;; We do not swap with another local.set of struct.new. |
kripken
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May 28, 2024
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Heap stores (
struct.set) are optimized into thestruct.newwhen they are adjacent in a statement list.Pushing
struct.newdown when they are not adjacent increases the likelihood for heap stores to be optimized. Optimizing heap stores is a beneficial step in making struct fields immutable which in turn helps other various optimziations.