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wrap_index without abs #3769

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Merged
youknowone merged 1 commit into from
Feb 13, 2023
Merged

wrap_index without abs #3769

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13 changes: 7 additions & 6 deletions vm/src/sliceable.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -308,14 +308,15 @@ impl SequenceIndexOp for isize {
}

fn wrapped_at(&self, len: usize) -> Option<usize> {
let neg = self.is_negative();
let p = self.unsigned_abs();
if neg {
len.checked_sub(p)
} else if p >= len {
let mut p = *self;
if p < 0 {
// casting to isize is ok because it is used by wrapping_add
p = p.wrapping_add(len as isize);
}
if p < 0 || (p as usize) >= len {
None
} else {
Some(p)
Some(p as usize)
}
}
}
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