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add a canary test for complex repr(simd)

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This commit is contained in:
Ashley Mannix 2020-11-15 09:35:04 +10:00
parent 74f2941a8e
commit 7565809163
3 changed files with 57 additions and 1 deletions
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8
compiler/rustc_middle/src/ty/sty.rs
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@ -1966,7 +1966,13 @@ impl<'tcx> TyS<'tcx> {
let f0_ty = variant.fields[0].ty(tcx, substs);
match f0_ty.kind() {
Array(f0_elem_ty, f0_len) => (f0_len.eval_usize(tcx, ParamEnv::empty()) as u64, f0_elem_ty),
Array(f0_elem_ty, f0_len) => {
// FIXME(repr_simd): https://github.com/rust-lang/rust/pull/78863#discussion_r522784112
// The way we evaluate the `N` in `[T; N]` here only works since we use
// `simd_size_and_type` post-monomorphization. It will probably start to ICE
// if we use it in generic code. See the `simd-array-trait` ui test.
(f0_len.eval_usize(tcx, ParamEnv::empty()) as u64, f0_elem_ty)
}
_ => (variant.fields.len() as u64, f0_ty),
}
}