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Use `std::mem::{size_of, size_of_val, align_of, align_of_val}` from the
prelude instead of importing or qualifying them.
These functions were added to all preludes in Rust 1.80.
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also move internal const_panic helpers to a better location
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Operations like is_aligned would return actively wrong results at compile-time,
i.e. calling it on the same pointer at compiletime and runtime could yield
different results. That's no good.
Instead of having hacks to make align_offset kind-of work in const-eval, just
use const_eval_select in the few places where it makes sense, which also ensures
those places are all aware they need to make sure the fallback behavior is
consistent.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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Some masks where defined as
```rust
const NONASCII_MASK: usize = 0x80808080_80808080u64 as usize;
```
where it was assumed that `usize` is never wider than 64, which is currently true.
To make those constants valid in a hypothetical 128-bit target, these constants have been redefined in an `usize`-width-agnostic way
```rust
const NONASCII_MASK: usize = usize::from_ne_bytes([0x80; size_of::<usize>()]);
```
There are already some cases where Rust anticipates the possibility of supporting 128-bit targets, such as not implementing `From<usize>` for `u64`.
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is UTF-8-like
The functions are now `unsafe` and they use `Option::unwrap_unchecked` instead of `unwrap_or_0`
`unwrap_or_0` was added in 42357d772b8a3a1ce4395deeac0a5cf1f66e951d. I guess `unwrap_unchecked` was not available back then.
Given this example:
```rust
pub fn first_char(s: &str) -> Option<char> {
s.chars().next()
}
```
Previously, the following assembly was produced:
```asm
_ZN7example10first_char17ha056ddea6bafad1cE:
.cfi_startproc
test rsi, rsi
je .LBB0_1
movzx edx, byte ptr [rdi]
test dl, dl
js .LBB0_3
mov eax, edx
ret
.LBB0_1:
mov eax, 1114112
ret
.LBB0_3:
lea r8, [rdi + rsi]
xor eax, eax
mov r9, r8
cmp rsi, 1
je .LBB0_5
movzx eax, byte ptr [rdi + 1]
add rdi, 2
and eax, 63
mov r9, rdi
.LBB0_5:
mov ecx, edx
and ecx, 31
cmp dl, -33
jbe .LBB0_6
cmp r9, r8
je .LBB0_9
movzx esi, byte ptr [r9]
add r9, 1
and esi, 63
shl eax, 6
or eax, esi
cmp dl, -16
jb .LBB0_12
.LBB0_13:
cmp r9, r8
je .LBB0_14
movzx edx, byte ptr [r9]
and edx, 63
jmp .LBB0_16
.LBB0_6:
shl ecx, 6
or eax, ecx
ret
.LBB0_9:
xor esi, esi
mov r9, r8
shl eax, 6
or eax, esi
cmp dl, -16
jae .LBB0_13
.LBB0_12:
shl ecx, 12
or eax, ecx
ret
.LBB0_14:
xor edx, edx
.LBB0_16:
and ecx, 7
shl ecx, 18
shl eax, 6
or eax, ecx
or eax, edx
ret
```
After this change, the assembly is reduced to:
```asm
_ZN7example10first_char17h4318683472f884ccE:
.cfi_startproc
test rsi, rsi
je .LBB0_1
movzx ecx, byte ptr [rdi]
test cl, cl
js .LBB0_3
mov eax, ecx
ret
.LBB0_1:
mov eax, 1114112
ret
.LBB0_3:
mov eax, ecx
and eax, 31
movzx esi, byte ptr [rdi + 1]
and esi, 63
cmp cl, -33
jbe .LBB0_4
movzx edx, byte ptr [rdi + 2]
shl esi, 6
and edx, 63
or edx, esi
cmp cl, -16
jb .LBB0_7
movzx ecx, byte ptr [rdi + 3]
and eax, 7
shl eax, 18
shl edx, 6
and ecx, 63
or ecx, edx
or eax, ecx
ret
.LBB0_4:
shl eax, 6
or eax, esi
ret
.LBB0_7:
shl eax, 12
or eax, edx
ret
```
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This commit makes the following functions from `core::str` `const fn`:
- `from_utf8[_mut]` (`feature(const_str_from_utf8)`)
- `from_utf8_unchecked_mut` (`feature(const_str_from_utf8_unchecked_mut)`)
- `Utf8Error::{valid_up_to,error_len}` (`feature(const_str_from_utf8)`)
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Add #[must_use] to remaining core functions
I've run out of compelling reasons to group functions together across crates so I'm just going to go module-by-module. This is everything remaining from the `core` crate.
Ignored by clippy for reasons unknown:
```rust
core::alloc::Layout unsafe fn for_value_raw<T: ?Sized>(t: *const T) -> Self;
core::any const fn type_name_of_val<T: ?Sized>(_val: &T) -> &'static str;
```
Ignored by clippy because of `mut`:
```rust
str fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str);
```
<del>
Ignored by clippy presumably because a caller might want `f` called for side effects. That seems like a bad usage of `map` to me.
```rust
core::cell::Ref<'b, T> fn map<U: ?Sized, F>(orig: Ref<'b, T>, f: F) -> Ref<'b, T>;
core::cell::Ref<'b, T> fn map_split<U: ?Sized, V: ?Sized, F>(orig: Ref<'b, T>, f: F) -> (Ref<'b, U>, Ref<'b, V>);
```
</del>
Parent issue: #89692
r? ```@joshtriplett```
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Using short-circuiting operators makes it easier to perform some kinds
of source code analysis, like MC/DC code coverage (a requirement in
safety-critical environments). The optimized x86_64 assembly is
equivalent between the old and new versions.
Old assembly of that condition:
```
mov rax, qword ptr [rdi + rdx + 8]
or rax, qword ptr [rdi + rdx]
test rax, r9
je .LBB0_7
```
New assembly of that condition:
```
mov rax, qword ptr [rdi + rdx]
or rax, qword ptr [rdi + rdx + 8]
test rax, r8
je .LBB0_7
```
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```
old, -O2, x86-64
test str::str_validate_emoji ... bench: 4,606 ns/iter (+/- 64)
new, -O2, x86-64
test str::str_validate_emoji ... bench: 3,837 ns/iter (+/- 60)
```
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it shows consistent improvements across several x86_64 feature levels
```
old, -O2, x86-64
test str::str_char_count_emoji ... bench: 1,924 ns/iter (+/- 26)
test str::str_char_count_lorem ... bench: 879 ns/iter (+/- 12)
test str::str_char_count_lorem_short ... bench: 5 ns/iter (+/- 0)
new, -O2, x86-64
test str::str_char_count_emoji ... bench: 1,878 ns/iter (+/- 21)
test str::str_char_count_lorem ... bench: 851 ns/iter (+/- 11)
test str::str_char_count_lorem_short ... bench: 4 ns/iter (+/- 0)
old, -O2, x86-64-v2
test str::str_char_count_emoji ... bench: 1,477 ns/iter (+/- 46)
test str::str_char_count_lorem ... bench: 675 ns/iter (+/- 15)
test str::str_char_count_lorem_short ... bench: 5 ns/iter (+/- 0)
new, -O2, x86-64-v2
test str::str_char_count_emoji ... bench: 1,323 ns/iter (+/- 39)
test str::str_char_count_lorem ... bench: 593 ns/iter (+/- 18)
test str::str_char_count_lorem_short ... bench: 4 ns/iter (+/- 0)
old, -O2, x86-64-v3
test str::str_char_count_emoji ... bench: 748 ns/iter (+/- 7)
test str::str_char_count_lorem ... bench: 348 ns/iter (+/- 2)
test str::str_char_count_lorem_short ... bench: 5 ns/iter (+/- 0)
new, -O2, x86-64-v3
test str::str_char_count_emoji ... bench: 650 ns/iter (+/- 4)
test str::str_char_count_lorem ... bench: 301 ns/iter (+/- 1)
test str::str_char_count_lorem_short ... bench: 5 ns/iter (+/- 0)
```
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This macro is used in expression position (a match arm), and only
compiles because of #33953
Regardless of what happens with that issue, this makes the
usage of the macro less confusing at the call site.
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