bjoernager/rust
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Fix maximum SIMD lane count, and expose it to other crates. Disallow SIMD vectors with non-power-of-two lengths.

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This commit is contained in:
Caleb Zulawski 2021-01-23 16:31:43 -05:00
parent 07db2bfe39
commit 8451656fe7
17 changed files with 151 additions and 172 deletions
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15
compiler/rustc_typeck/src/check/check.rs
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@ -12,6 +12,7 @@ use rustc_hir::{ItemKind, Node};
use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use rustc_infer::infer::{RegionVariableOrigin, TyCtxtInferExt};
use rustc_middle::ty::fold::TypeFoldable;
use rustc_middle::ty::layout::MAX_SIMD_LANES;
use rustc_middle::ty::subst::GenericArgKind;
use rustc_middle::ty::util::{Discr, IntTypeExt, Representability};
use rustc_middle::ty::{self, ParamEnv, RegionKind, ToPredicate, Ty, TyCtxt};
@ -1108,12 +1109,22 @@ pub fn check_simd(tcx: TyCtxt<'_>, sp: Span, def_id: LocalDefId) {
if len == 0 {
struct_span_err!(tcx.sess, sp, E0075, "SIMD vector cannot be empty").emit();
return;
} else if len > 65536 {
} else if !len.is_power_of_two() {
struct_span_err!(
tcx.sess,
sp,
E0075,
"SIMD vector cannot have more than 65536 elements"
"SIMD vector length must be a power of two"
)
.emit();
return;
} else if len > MAX_SIMD_LANES {
struct_span_err!(
tcx.sess,
sp,
E0075,
"SIMD vector cannot have more than {} elements",
MAX_SIMD_LANES,
)
.emit();
return;