Commit Graph

5 Commits

Author SHA1 Message Date
Scott McMurray
a32305a80f Re-optimize Layout::array
This way it's one check instead of two, so hopefully it'll be better

Nightly:
```
layout_array_i32:
	movq	%rdi, %rax
	movl	$4, %ecx
	mulq	%rcx
	jo	.LBB1_2
	movabsq	$9223372036854775805, %rcx
	cmpq	%rcx, %rax
	jae	.LBB1_2
	movl	$4, %edx
	retq
.LBB1_2:
	…
```

This PR:
```
	movq	%rcx, %rax
	shrq	$61, %rax
	jne	.LBB2_1
	shlq	$2, %rcx
	movl	$4, %edx
	movq	%rcx, %rax
	retq
.LBB2_1:
	…
```
2022-07-13 17:07:41 -07:00
Ralf Jung
8c977cfda8 libcore tests: avoid int2ptr casts 2022-06-27 13:30:44 -04:00
liangyongrui
03b2588837 fix Layout struct member naming style 2022-04-11 13:35:18 +08:00
Scott McMurray
fe0c08a4f2 Make non-power-of-two alignments a validity error in Layout
Inspired by the zulip conversation about how `Layout` should better enforce `size < isize::MAX as usize`, this uses an N-variant enum on N-bit platforms to require at the validity level that the existing invariant of "must be a power of two" is upheld.

This was MIRI can catch it, and means there's a more-specific type for `Layout` to store than just `NonZeroUsize`.
2022-04-08 20:17:38 -07:00
mark
2c31b45ae8 mv std libs to library/ 2020-07-27 19:51:13 -05:00