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Intrinsic overflow checks perf trial #146288

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pitaj wants to merge 5 commits into from
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Intrinsic overflow checks perf trial #146288

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5518779
refactor ub_checks and contract_checks to share logic
pitaj May 4, 2025
e79bbaa
add `overflow_checks` intrinsic
pitaj Aug 4, 2024
bf981b7
fix a couple unstable attributes
pitaj May 4, 2025
74cccf7
new RangeFrom overflow check
pitaj May 4, 2025
47e50ab
overflow_checks intrinsic compile time perf trial
pitaj Oct 9, 2025
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overflow_checks intrinsic compile time perf trial
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@pitaj
pitaj committed Oct 9, 2025
commit 47e50ab1635893b9e8d10ee1ce8fda51d7d12d5e
5 changes: 5 additions & 0 deletions library/core/src/iter/range.rs
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Expand Up @@ -1014,6 +1014,11 @@ impl<A: Step> Iterator for ops::RangeFrom<A> {

#[inline]
fn next(&mut self) -> Option<A> {
// Panic when at max-2, rather than at max-1 as usual
if crate::intrinsics::overflow_checks() {
Step::forward(self.start.clone(), 2);
}

let n = Step::forward(self.start.clone(), 1);
Some(mem::replace(&mut self.start, n))
}
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