Auto merge of #147019 - Zalathar:rollup-boxzbmo, r=Zalathar

Rollup of 14 pull requests

Successful merges:

 - rust-lang/rust#145067 (RawVecInner: add missing `unsafe` to unsafe fns)
 - rust-lang/rust#145277 (Do not materialise X in [X; 0] when X is unsizing a const)
 - rust-lang/rust#145973 (Add `std` support for `armv7a-vex-v5`)
 - rust-lang/rust#146667 (Add an attribute to check the number of lanes in a SIMD vector after monomorphization)
 - rust-lang/rust#146735 (unstably constify float mul_add methods)
 - rust-lang/rust#146737 (f16_f128: enable some more tests in Miri)
 - rust-lang/rust#146766 (Add attributes for #[global_allocator] functions)
 - rust-lang/rust#146905 (llvm: update remarks support on LLVM 22)
 - rust-lang/rust#146982 (Remove erroneous normalization step in `tests/run-make/linker-warning`)
 - rust-lang/rust#147005 (Small string formatting cleanup)
 - rust-lang/rust#147007 (Explicitly note `&[SocketAddr]` impl of `ToSocketAddrs`)
 - rust-lang/rust#147008 (bootstrap.py: Respect build.jobs while building bootstrap tool)
 - rust-lang/rust#147013 (rustdoc: Fix documentation for `--doctest-build-arg`)
 - rust-lang/rust#147015 (Use `LLVMDisposeTargetMachine`)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 22 insertions, 4 deletions

diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index c4cb43011ad..f59bc2117d5 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -7,12 +7,14 @@ use rustc_abi::{
     VariantIdx, Variants, WrappingRange,
 };
 use rustc_hashes::Hash64;
+use rustc_hir::attrs::AttributeKind;
+use rustc_hir::find_attr;
 use rustc_index::IndexVec;
 use rustc_middle::bug;
 use rustc_middle::query::Providers;
 use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::layout::{
-    FloatExt, HasTyCtxt, IntegerExt, LayoutCx, LayoutError, LayoutOf, TyAndLayout,
+    FloatExt, HasTyCtxt, IntegerExt, LayoutCx, LayoutError, LayoutOf, SimdLayoutError, TyAndLayout,
 };
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{
@@ -23,7 +25,7 @@ use rustc_span::{Symbol, sym};
 use tracing::{debug, instrument};
 use {rustc_abi as abi, rustc_hir as hir};
 
-use crate::errors::{NonPrimitiveSimdType, OversizedSimdType, ZeroLengthSimdType};
+use crate::errors::NonPrimitiveSimdType;
 
 mod invariant;
 
@@ -121,11 +123,11 @@ fn map_error<'tcx>(
         }
         LayoutCalculatorError::ZeroLengthSimdType => {
             // Can't be caught in typeck if the array length is generic.
-            cx.tcx().dcx().emit_fatal(ZeroLengthSimdType { ty })
+            LayoutError::InvalidSimd { ty, kind: SimdLayoutError::ZeroLength }
         }
         LayoutCalculatorError::OversizedSimdType { max_lanes } => {
             // Can't be caught in typeck if the array length is generic.
-            cx.tcx().dcx().emit_fatal(OversizedSimdType { ty, max_lanes })
+            LayoutError::InvalidSimd { ty, kind: SimdLayoutError::TooManyLanes(max_lanes) }
         }
         LayoutCalculatorError::NonPrimitiveSimdType(field) => {
             // This error isn't caught in typeck, e.g., if
@@ -563,6 +565,22 @@ fn layout_of_uncached<'tcx>(
 
             let e_ly = cx.layout_of(e_ty)?;
 
+            // Check for the rustc_simd_monomorphize_lane_limit attribute and check the lane limit
+            if let Some(limit) = find_attr!(
+                tcx.get_all_attrs(def.did()),
+                AttributeKind::RustcSimdMonomorphizeLaneLimit(limit) => limit
+            ) {
+                if !limit.value_within_limit(e_len as usize) {
+                    return Err(map_error(
+                        &cx,
+                        ty,
+                        rustc_abi::LayoutCalculatorError::OversizedSimdType {
+                            max_lanes: limit.0 as u64,
+                        },
+                    ));
+                }
+            }
+
             map_layout(cx.calc.simd_type(e_ly, e_len, def.repr().packed()))?
         }