Add log2 and log10 to NonZeroU*
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This version is nice in that it doesn't need to worry about zeros, and thus doesn't have any error cases.
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r? @yaahc (rust-highfive has picked a reviewer for you, use r? to override) |
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Jan 16, 2022
| pub const fn u8(val: u8) -> u32 { | ||
| let val = val as u32; | ||
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| // For better performance, avoid branches by assembling the solution |
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These are unchanged, just de-indented. You might want to use ignore whitespace mode to review.
scottmcm
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Jan 16, 2022
| Some(x.log2()) | ||
| } else { | ||
| // SAFETY: We just checked that this number is positive | ||
| let log = (Self::BITS - 1) - unsafe { intrinsics::ctlz_nonzero(self) as u32 }; |
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One fewer unsafe, as a bonus.
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@bors r+ |
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📌 Commit 3dfcc66 has been approved by |
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…askrgr Rollup of 10 pull requests Successful merges: - rust-lang#90498 (Clarifications in the target tier policy) - rust-lang#92164 (Implement `#[rustc_must_implement_one_of]` attribute) - rust-lang#92729 (rustc_codegen_llvm: Remove (almost) unused span parameter from many functions in metadata.rs) - rust-lang#92752 (Correct minor typos in some long error code explanations) - rust-lang#92801 (Enable wrapping words by default) - rust-lang#92825 (Rename environment variable for overriding rustc version) - rust-lang#92877 (Remove LLVMRustMarkAllFunctionsNounwind) - rust-lang#92936 (rustdoc: Remove `collect` in `html::markdown::parse`) - rust-lang#92956 (Add `log2` and `log10` to `NonZeroU*`) - rust-lang#92960 (Use `carrying_{mul|add}` in `num::bignum`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This version is nice in that it doesn't need to worry about zeros, and thus doesn't have any error cases.
cc
int_logtracking issue #70887(I didn't add them to
NonZeroI*despite it being oni*since allowing negatives bring back the error cases again.)