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Disable the unpack optimization

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This commit is contained in:
Noah 2020-04-24 15:14:58 -05:00
parent 1e12aa8afe
commit aba7359b36
2 changed files with 25 additions and 24 deletions
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2
src/peephole.rs
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@ -92,7 +92,7 @@ impl<O: OutputStream> PeepholeOptimizer<O> {
}
fn optimize(&mut self) {
apply_optimizations!(self, operator, unpack);
apply_optimizations!(self, operator /* , unpack */);
}
}

47
src/peephole/optimizations.rs
View file

@ -73,26 +73,27 @@ pub fn operator(buf: &mut impl OptimizationBuffer) {
}
}
pub fn unpack(buf: &mut impl OptimizationBuffer) {
let (instruction, meta) = buf.pop();
if let Instruction::UnpackSequence { size } = instruction {
let (arg, arg_meta) = buf.pop();
match arg {
Instruction::BuildTuple {
size: tup_size,
unpack,
} if !unpack && tup_size == size => {
buf.emit(
Instruction::Reverse { amount: size },
vec![arg_meta, meta].into(),
);
}
arg => {
buf.emit(arg, arg_meta);
buf.emit(instruction, meta);
}
}
} else {
buf.emit(instruction, meta)
}
}
// TODO: make a version of this that doesn't miscompile `a, b = (1, 2) if True else (3, 4)`
// pub fn unpack(buf: &mut impl OptimizationBuffer) {
// let (instruction, meta) = buf.pop();
// if let Instruction::UnpackSequence { size } = instruction {
// let (arg, arg_meta) = buf.pop();
// match arg {
// Instruction::BuildTuple {
// size: tup_size,
// unpack,
// } if !unpack && tup_size == size => {
// buf.emit(
// Instruction::Reverse { amount: size },
// vec![arg_meta, meta].into(),
// );
// }
// arg => {
// buf.emit(arg, arg_meta);
// buf.emit(instruction, meta);
// }
// }
// } else {
// buf.emit(instruction, meta)
// }
// }