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Rollup merge of #109287 - scottmcm:hash-slice-size-of-val, r=oli-obk

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Use `size_of_val` instead of manual calculation

Very minor thing that I happened to notice in passing, but it's both shorter and [means it gets `mul nsw`](https://rust.godbolt.org/z/Y9KxYETv5), so why not.
This commit is contained in:
Matthias Krüger 2023-03-18 12:04:24 +01:00 committed by GitHub
commit 0aa0043141
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2 changed files with 2 additions and 2 deletions
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2
compiler/rustc_codegen_ssa/src/glue.rs
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@ -46,7 +46,7 @@ pub fn size_and_align_of_dst<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
// NOTE: ideally, we want the effects of both `unchecked_smul` and `unchecked_umul`
// (resulting in `mul nsw nuw` in LLVM IR), since we know that the multiplication
// cannot signed wrap, and that both operands are non-negative. But at the time of writing,
// `BuilderMethods` can't do this, and it doesn't seem to enable any further optimizations.
// the `LLVM-C` binding can't do this, and it doesn't seem to enable any further optimizations.
bx.unchecked_smul(info.unwrap(), bx.const_usize(unit.size.bytes())),
bx.const_usize(unit.align.abi.bytes()),
)

2
library/core/src/hash/mod.rs
View File

@ -834,7 +834,7 @@ fn hash<H: ~const Hasher>(&self, state: &mut H) {
#[inline]
fn hash_slice<H: ~const Hasher>(data: &[$ty], state: &mut H) {
let newlen = data.len() * mem::size_of::<$ty>();
let newlen = mem::size_of_val(data);
let ptr = data.as_ptr() as *const u8;
// SAFETY: `ptr` is valid and aligned, as this macro is only used
// for numeric primitives which have no padding. The new slice only