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Auto merge of rust-lang#74245 - Manishearth:rollup-r0xq9dn, r=Manishe…
…arth Rollup of 10 pull requests Successful merges: - rust-lang#72920 (Stabilize `transmute` in constants and statics but not const fn) - rust-lang#73715 (debuginfo: Mangle tuples to be natvis friendly, typedef basic types) - rust-lang#74066 (Optimize is_ascii for str and [u8].) - rust-lang#74116 (Fix cross compilation of LLVM to aarch64 Windows targets) - rust-lang#74167 (linker: illumos ld does not support --eh-frame-hdr) - rust-lang#74168 (Add a help to use `in_band_lifetimes` in nightly) - rust-lang#74197 (Reword incorrect `self` token suggestion) - rust-lang#74213 (Minor refactor for rustc_resolve diagnostics match) - rust-lang#74240 (Fix rust-lang#74081 and add the test case from rust-lang#74236) - rust-lang#74241 (update miri) Failed merges: r? @ghost
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| use super::{LONG, MEDIUM, SHORT}; | ||
| use test::black_box; | ||
| use test::Bencher; | ||
|
|
||
| macro_rules! benches { | ||
| ($( fn $name: ident($arg: ident: &[u8]) $body: block )+) => { | ||
| benches!(mod short SHORT[..] $($name $arg $body)+); | ||
| benches!(mod medium MEDIUM[..] $($name $arg $body)+); | ||
| benches!(mod long LONG[..] $($name $arg $body)+); | ||
| // Ensure we benchmark cases where the functions are called with strings | ||
| // that are not perfectly aligned or have a length which is not a | ||
| // multiple of size_of::<usize>() (or both) | ||
| benches!(mod unaligned_head MEDIUM[1..] $($name $arg $body)+); | ||
| benches!(mod unaligned_tail MEDIUM[..(MEDIUM.len() - 1)] $($name $arg $body)+); | ||
| benches!(mod unaligned_both MEDIUM[1..(MEDIUM.len() - 1)] $($name $arg $body)+); | ||
| }; | ||
|
|
||
| (mod $mod_name: ident $input: ident [$range: expr] $($name: ident $arg: ident $body: block)+) => { | ||
| mod $mod_name { | ||
| use super::*; | ||
| $( | ||
| #[bench] | ||
| fn $name(bencher: &mut Bencher) { | ||
| bencher.bytes = $input[$range].len() as u64; | ||
| let mut vec = $input.as_bytes().to_vec(); | ||
| bencher.iter(|| { | ||
| let $arg: &[u8] = &black_box(&mut vec)[$range]; | ||
| black_box($body) | ||
| }) | ||
| } | ||
| )+ | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| benches! { | ||
| fn case00_libcore(bytes: &[u8]) { | ||
| bytes.is_ascii() | ||
| } | ||
|
|
||
| fn case01_iter_all(bytes: &[u8]) { | ||
| bytes.iter().all(|b| b.is_ascii()) | ||
| } | ||
|
|
||
| fn case02_align_to(bytes: &[u8]) { | ||
| is_ascii_align_to(bytes) | ||
| } | ||
|
|
||
| fn case03_align_to_unrolled(bytes: &[u8]) { | ||
| is_ascii_align_to_unrolled(bytes) | ||
| } | ||
| } | ||
|
|
||
| // These are separate since it's easier to debug errors if they don't go through | ||
| // macro expansion first. | ||
| fn is_ascii_align_to(bytes: &[u8]) -> bool { | ||
| if bytes.len() < core::mem::size_of::<usize>() { | ||
| return bytes.iter().all(|b| b.is_ascii()); | ||
| } | ||
| // SAFETY: transmuting a sequence of `u8` to `usize` is always fine | ||
| let (head, body, tail) = unsafe { bytes.align_to::<usize>() }; | ||
| head.iter().all(|b| b.is_ascii()) | ||
| && body.iter().all(|w| !contains_nonascii(*w)) | ||
| && tail.iter().all(|b| b.is_ascii()) | ||
| } | ||
|
|
||
| fn is_ascii_align_to_unrolled(bytes: &[u8]) -> bool { | ||
| if bytes.len() < core::mem::size_of::<usize>() { | ||
| return bytes.iter().all(|b| b.is_ascii()); | ||
| } | ||
| // SAFETY: transmuting a sequence of `u8` to `[usize; 2]` is always fine | ||
| let (head, body, tail) = unsafe { bytes.align_to::<[usize; 2]>() }; | ||
| head.iter().all(|b| b.is_ascii()) | ||
| && body.iter().all(|w| !contains_nonascii(w[0] | w[1])) | ||
| && tail.iter().all(|b| b.is_ascii()) | ||
| } | ||
|
|
||
| #[inline] | ||
| fn contains_nonascii(v: usize) -> bool { | ||
| const NONASCII_MASK: usize = 0x80808080_80808080u64 as usize; | ||
| (NONASCII_MASK & v) != 0 | ||
| } |
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