bors 908fc5b26d Auto merge of #99174 - scottmcm:reoptimize-layout-array, r=joshtriplett ... Reoptimize layout array This way it's one check instead of two, so hopefully (cc #99117) it'll be simpler for rustc perf too 🤞 Quick demonstration: ```rust pub fn demo(n: usize) -> Option<Layout> { Layout::array::<i32>(n).ok() } ``` Nightly: <https://play.rust-lang.org/?version=nightly&mode=release&edition=2021&gist=e97bf33508aa03f38968101cdeb5322d> ```nasm mov rax, rdi mov ecx, 4 mul rcx seto cl movabs rdx, 9223372036854775805 xor esi, esi cmp rax, rdx setb sil shl rsi, 2 xor edx, edx test cl, cl cmove rdx, rsi ret ``` This PR (note no `mul`, in addition to being much shorter): ```nasm xor edx, edx lea rax, [4*rcx] shr rcx, 61 sete dl shl rdx, 2 ret ``` This is built atop `@CAD97` 's #99136; the new changes are cb8aba66ef6a0e17f08a0574e4820653e31b45a0. I added a bunch more tests for `Layout::from_size_align` and `Layout::array` too.		2022-08-10 23:50:18 +00:00
..
benches	Rename integer log* methods to ilog*	2022-08-09 10:20:49 -07:00
primitive_docs	Add primitive documentation to libcore	2021-09-12 02:23:08 +00:00
src	Auto merge of #99174 - scottmcm:reoptimize-layout-array, r=joshtriplett	2022-08-10 23:50:18 +00:00
tests	Auto merge of #99174 - scottmcm:reoptimize-layout-array, r=joshtriplett	2022-08-10 23:50:18 +00:00
Cargo.toml	Avoid use of rand::thread_rng in stdlib benchmarks	2022-05-02 00:08:21 -07:00