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Update library/core/src/num/mod.rs

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Co-authored-by: LingMan <LingMan@users.noreply.github.com>
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Squirrel 2021-05-18 18:22:21 +01:00 • committed by gilescope
parent 48b7cc49a3
commit b9923a80c2
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library/core/src/num/mod.rs
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@ -1097,8 +1097,8 @@ fn from_str_radix<T: FromStrRadixHelper>(src: &str, radix: u32) -> Result<T, Par
// the compiler can use shifts if `radix` can be expressed as a // the compiler can use shifts if `radix` can be expressed as a
// sum of powers of 2 (x*10 can be written as x*8 + x*2). // sum of powers of 2 (x*10 can be written as x*8 + x*2).
// When the compiler can't use these optimisations, // When the compiler can't use these optimisations,
// there is a latency of several cycles so doing the // the latency of the multiplication can be hidden by issuing it
// multiply before we need to use the result helps. // before the result is needed.
let mul = result.checked_mul(radix); let mul = result.checked_mul(radix);
let x = (c as char).to_digit(radix).ok_or(PIE { kind: InvalidDigit })?; let x = (c as char).to_digit(radix).ok_or(PIE { kind: InvalidDigit })?;
result = mul.ok_or_else(overflow_err)?; result = mul.ok_or_else(overflow_err)?;