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test: Fix an overflow on empty benchmarks #23127

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Merged
merged 1 commit into from
Mar 8, 2015
Merged

test: Fix an overflow on empty benchmarks #23127

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9 changes: 8 additions & 1 deletion src/libtest/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1108,7 +1108,14 @@ impl Bencher {
return summ5;
}

n *= 2;
// If we overflow here just return the results so far. We check a
// multiplier of 10 because we're about to multiply by 2 and the
// next iteration of the loop will also multiply by 5 (to calculate
// the summ5 result)
n = match n.checked_mul(10) {
Some(_) => n * 2,
None => return summ5,
};
}
}
}
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