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Bytecode parity by youknowone · Pull Request #7481 · RustPython/RustPython · GitHub
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Bytecode parity #7481

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Merged
youknowone merged 7 commits into from
Mar 25, 2026
Merged

Bytecode parity #7481

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d0cb8e1
Bytecode parity
youknowone Mar 23, 2026
6d4ed64
Fix formatting and collapsible_if clippy warnings in compile.rs
youknowone Mar 23, 2026
12b405d
Fix clippy, fold_unary_negative chaining, and generator line tracing
youknowone Mar 23, 2026
970a9c9
Fix JIT StoreFastStoreFast, format, and remove expectedFailure markers
youknowone Mar 23, 2026
9f952c7
Fix peephole optimizer: use NOP replacement instead of remove()
youknowone Mar 25, 2026
ce07e05
Revert peephole_optimize to use remove() for chaining support
youknowone Mar 25, 2026
289172a
Fix StoreFastStoreFast to handle NULL from LoadFastAndClear
youknowone Mar 25, 2026
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Revert peephole_optimize to use remove() for chaining support 
NOP replacement broke chaining of peephole optimizations (e.g.
LOAD_CONST+TO_BOOL then LOAD_CONST+UNARY_NOT for 'not True').
The remove() approach is used by upstream and works correctly here;
fold_unary_negative keeps NOP replacement since it doesn't need chaining.
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@youknowone
youknowone committed Mar 25, 2026
commit ce07e05795ed4bee1d87a53a0e3161ff177e373c
8 changes: 3 additions & 5 deletions crates/codegen/src/ir.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1054,11 +1054,9 @@ impl CodeInfo {
// Combine: keep first instruction's location, replace with combined instruction
block.instructions[i].instr = new_instr.into();
block.instructions[i].arg = new_arg;
// Replace the second instruction with NOP
let loc = block.instructions[i].location;
block.instructions[i + 1].instr = Instruction::Nop.into();
block.instructions[i + 1].location = loc;
i += 2;
// Remove the second instruction
block.instructions.remove(i + 1);
// Don't increment i - check if we can combine again with the next instruction
} else {
i += 1;
}
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