compiler/rustc_hir_analysis/src/check/intrinsic.rs

   1 //! Type-checking for the rust-intrinsic and platform-intrinsic
   2 //! intrinsics that the compiler exposes.
   3
   4 use crate::errors::{
   5     UnrecognizedAtomicOperation, UnrecognizedIntrinsicFunction,
   6     WrongNumberOfGenericArgumentsToIntrinsic,
   7 };
   8 use crate::require_same_types;
   9
  10 use hir::def_id::DefId;
  11 use rustc_errors::{struct_span_err, DiagnosticMessage};
  12 use rustc_hir as hir;
  13 use rustc_middle::traits::{ObligationCause, ObligationCauseCode};
  14 use rustc_middle::ty::{self, TyCtxt};
  15 use rustc_span::symbol::{kw, sym, Symbol};
  16 use rustc_target::spec::abi::Abi;
  17
  18 use std::iter;
  19
  20 fn equate_intrinsic_type<'tcx>(
  21     tcx: TyCtxt<'tcx>,
  22     it: &hir::ForeignItem<'_>,
  23     n_tps: usize,
  24     n_lts: usize,
  25     sig: ty::PolyFnSig<'tcx>,
  26 ) {
  27     let (own_counts, span) = match &it.kind {
  28         hir::ForeignItemKind::Fn(.., generics) => {
  29             let own_counts = tcx.generics_of(it.owner_id.to_def_id()).own_counts();
  30             (own_counts, generics.span)
  31         }
  32         _ => {
  33             struct_span_err!(tcx.sess, it.span, E0622, "intrinsic must be a function")
  34                 .span_label(it.span, "expected a function")
  35                 .emit();
  36             return;
  37         }
  38     };
  39
  40     let gen_count_ok = |found: usize, expected: usize, descr: &str| -> bool {
  41         if found != expected {
  42             tcx.sess.emit_err(WrongNumberOfGenericArgumentsToIntrinsic {
  43                 span,
  44                 found,
  45                 expected,
  46                 descr,
  47             });
  48             false
  49         } else {
  50             true
  51         }
  52     };
  53
  54     if gen_count_ok(own_counts.lifetimes, n_lts, "lifetime")
  55         && gen_count_ok(own_counts.types, n_tps, "type")
  56         && gen_count_ok(own_counts.consts, 0, "const")
  57     {
  58         let fty = tcx.mk_fn_ptr(sig);
  59         let it_def_id = it.owner_id.def_id;
  60         let cause = ObligationCause::new(it.span, it_def_id, ObligationCauseCode::IntrinsicType);
  61         require_same_types(tcx, &cause, tcx.mk_fn_ptr(tcx.fn_sig(it.owner_id)), fty);
  62     }
  63 }
  64
  65 /// Returns the unsafety of the given intrinsic.
  66 pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: DefId) -> hir::Unsafety {
  67     let has_safe_attr = match tcx.has_attr(intrinsic_id, sym::rustc_safe_intrinsic) {
  68         true => hir::Unsafety::Normal,
  69         false => hir::Unsafety::Unsafe,
  70     };
  71     let is_in_list = match tcx.item_name(intrinsic_id) {
  72         // When adding a new intrinsic to this list,
  73         // it's usually worth updating that intrinsic's documentation
  74         // to note that it's safe to call, since
  75         // safe extern fns are otherwise unprecedented.
  76         sym::abort
  77         | sym::assert_inhabited
  78         | sym::assert_zero_valid
  79         | sym::assert_mem_uninitialized_valid
  80         | sym::size_of
  81         | sym::min_align_of
  82         | sym::needs_drop
  83         | sym::caller_location
  84         | sym::add_with_overflow
  85         | sym::sub_with_overflow
  86         | sym::mul_with_overflow
  87         | sym::wrapping_add
  88         | sym::wrapping_sub
  89         | sym::wrapping_mul
  90         | sym::saturating_add
  91         | sym::saturating_sub
  92         | sym::rotate_left
  93         | sym::rotate_right
  94         | sym::ctpop
  95         | sym::ctlz
  96         | sym::cttz
  97         | sym::bswap
  98         | sym::bitreverse
  99         | sym::discriminant_value
 100         | sym::type_id
 101         | sym::likely
 102         | sym::unlikely
 103         | sym::ptr_guaranteed_cmp
 104         | sym::minnumf32
 105         | sym::minnumf64
 106         | sym::maxnumf32
 107         | sym::rustc_peek
 108         | sym::maxnumf64
 109         | sym::type_name
 110         | sym::forget
 111         | sym::black_box
 112         | sym::variant_count
 113         | sym::ptr_mask => hir::Unsafety::Normal,
 114         _ => hir::Unsafety::Unsafe,
 115     };
 116
 117     if has_safe_attr != is_in_list {
 118         tcx.sess.struct_span_err(
 119             tcx.def_span(intrinsic_id),
 120             DiagnosticMessage::Str(format!(
 121                     "intrinsic safety mismatch between list of intrinsics within the compiler and core library intrinsics for intrinsic `{}`",
 122                     tcx.item_name(intrinsic_id)
 123         ))).emit();
 124     }
 125
 126     is_in_list
 127 }
 128
 129 /// Remember to add all intrinsics here, in `compiler/rustc_codegen_llvm/src/intrinsic.rs`,
 130 /// and in `library/core/src/intrinsics.rs`.
 131 pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
 132     let param = |n| tcx.mk_ty_param(n, Symbol::intern(&format!("P{}", n)));
 133     let intrinsic_id = it.owner_id.to_def_id();
 134     let intrinsic_name = tcx.item_name(intrinsic_id);
 135     let name_str = intrinsic_name.as_str();
 136
 137     let bound_vars = tcx.mk_bound_variable_kinds(
 138         [
 139             ty::BoundVariableKind::Region(ty::BrAnon(0, None)),
 140             ty::BoundVariableKind::Region(ty::BrEnv),
 141         ]
 142         .iter()
 143         .copied(),
 144     );
 145     let mk_va_list_ty = |mutbl| {
 146         tcx.lang_items().va_list().map(|did| {
 147             let region = tcx.mk_region(ty::ReLateBound(
 148                 ty::INNERMOST,
 149                 ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) },
 150             ));
 151             let env_region = tcx.mk_region(ty::ReLateBound(
 152                 ty::INNERMOST,
 153                 ty::BoundRegion { var: ty::BoundVar::from_u32(1), kind: ty::BrEnv },
 154             ));
 155             let va_list_ty = tcx.bound_type_of(did).subst(tcx, &[region.into()]);
 156             (tcx.mk_ref(env_region, ty::TypeAndMut { ty: va_list_ty, mutbl }), va_list_ty)
 157         })
 158     };
 159
 160     let (n_tps, n_lts, inputs, output, unsafety) = if name_str.starts_with("atomic_") {
 161         let split: Vec<&str> = name_str.split('_').collect();
 162         assert!(split.len() >= 2, "Atomic intrinsic in an incorrect format");
 163
 164         //We only care about the operation here
 165         let (n_tps, inputs, output) = match split[1] {
 166             "cxchg" | "cxchgweak" => (
 167                 1,
 168                 vec![tcx.mk_mut_ptr(param(0)), param(0), param(0)],
 169                 tcx.intern_tup(&[param(0), tcx.types.bool]),
 170             ),
 171             "load" => (1, vec![tcx.mk_imm_ptr(param(0))], param(0)),
 172             "store" => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit()),
 173
 174             "xchg" | "xadd" | "xsub" | "and" | "nand" | "or" | "xor" | "max" | "min" | "umax"
 175             | "umin" => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], param(0)),
 176             "fence" | "singlethreadfence" => (0, Vec::new(), tcx.mk_unit()),
 177             op => {
 178                 tcx.sess.emit_err(UnrecognizedAtomicOperation { span: it.span, op });
 179                 return;
 180             }
 181         };
 182         (n_tps, 0, inputs, output, hir::Unsafety::Unsafe)
 183     } else {
 184         let unsafety = intrinsic_operation_unsafety(tcx, intrinsic_id);
 185         let (n_tps, inputs, output) = match intrinsic_name {
 186             sym::abort => (0, Vec::new(), tcx.types.never),
 187             sym::unreachable => (0, Vec::new(), tcx.types.never),
 188             sym::breakpoint => (0, Vec::new(), tcx.mk_unit()),
 189             sym::size_of | sym::pref_align_of | sym::min_align_of | sym::variant_count => {
 190                 (1, Vec::new(), tcx.types.usize)
 191             }
 192             sym::size_of_val | sym::min_align_of_val => {
 193                 (1, vec![tcx.mk_imm_ptr(param(0))], tcx.types.usize)
 194             }
 195             sym::rustc_peek => (1, vec![param(0)], param(0)),
 196             sym::caller_location => (0, vec![], tcx.caller_location_ty()),
 197             sym::assert_inhabited
 198             | sym::assert_zero_valid
 199             | sym::assert_mem_uninitialized_valid => (1, Vec::new(), tcx.mk_unit()),
 200             sym::forget => (1, vec![param(0)], tcx.mk_unit()),
 201             sym::transmute => (2, vec![param(0)], param(1)),
 202             sym::prefetch_read_data
 203             | sym::prefetch_write_data
 204             | sym::prefetch_read_instruction
 205             | sym::prefetch_write_instruction => (
 206                 1,
 207                 vec![
 208                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 209                     tcx.types.i32,
 210                 ],
 211                 tcx.mk_unit(),
 212             ),
 213             sym::drop_in_place => (1, vec![tcx.mk_mut_ptr(param(0))], tcx.mk_unit()),
 214             sym::needs_drop => (1, Vec::new(), tcx.types.bool),
 215
 216             sym::type_name => (1, Vec::new(), tcx.mk_static_str()),
 217             sym::type_id => (1, Vec::new(), tcx.types.u64),
 218             sym::offset | sym::arith_offset => (
 219                 1,
 220                 vec![
 221                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 222                     tcx.types.isize,
 223                 ],
 224                 tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 225             ),
 226             sym::ptr_mask => (
 227                 1,
 228                 vec![
 229                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 230                     tcx.types.usize,
 231                 ],
 232                 tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 233             ),
 234
 235             sym::copy | sym::copy_nonoverlapping => (
 236                 1,
 237                 vec![
 238                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 239                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 240                     tcx.types.usize,
 241                 ],
 242                 tcx.mk_unit(),
 243             ),
 244             sym::volatile_copy_memory | sym::volatile_copy_nonoverlapping_memory => (
 245                 1,
 246                 vec![
 247                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 248                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 249                     tcx.types.usize,
 250                 ],
 251                 tcx.mk_unit(),
 252             ),
 253             sym::write_bytes | sym::volatile_set_memory => (
 254                 1,
 255                 vec![
 256                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 257                     tcx.types.u8,
 258                     tcx.types.usize,
 259                 ],
 260                 tcx.mk_unit(),
 261             ),
 262             sym::sqrtf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 263             sym::sqrtf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 264             sym::powif32 => (0, vec![tcx.types.f32, tcx.types.i32], tcx.types.f32),
 265             sym::powif64 => (0, vec![tcx.types.f64, tcx.types.i32], tcx.types.f64),
 266             sym::sinf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 267             sym::sinf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 268             sym::cosf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 269             sym::cosf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 270             sym::powf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 271             sym::powf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 272             sym::expf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 273             sym::expf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 274             sym::exp2f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 275             sym::exp2f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 276             sym::logf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 277             sym::logf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 278             sym::log10f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 279             sym::log10f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 280             sym::log2f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 281             sym::log2f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 282             sym::fmaf32 => (0, vec![tcx.types.f32, tcx.types.f32, tcx.types.f32], tcx.types.f32),
 283             sym::fmaf64 => (0, vec![tcx.types.f64, tcx.types.f64, tcx.types.f64], tcx.types.f64),
 284             sym::fabsf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 285             sym::fabsf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 286             sym::minnumf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 287             sym::minnumf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 288             sym::maxnumf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 289             sym::maxnumf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 290             sym::copysignf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 291             sym::copysignf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 292             sym::floorf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 293             sym::floorf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 294             sym::ceilf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 295             sym::ceilf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 296             sym::truncf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 297             sym::truncf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 298             sym::rintf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 299             sym::rintf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 300             sym::nearbyintf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 301             sym::nearbyintf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 302             sym::roundf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 303             sym::roundf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 304
 305             sym::volatile_load | sym::unaligned_volatile_load => {
 306                 (1, vec![tcx.mk_imm_ptr(param(0))], param(0))
 307             }
 308             sym::volatile_store | sym::unaligned_volatile_store => {
 309                 (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit())
 310             }
 311
 312             sym::ctpop
 313             | sym::ctlz
 314             | sym::ctlz_nonzero
 315             | sym::cttz
 316             | sym::cttz_nonzero
 317             | sym::bswap
 318             | sym::bitreverse => (1, vec![param(0)], param(0)),
 319
 320             sym::add_with_overflow | sym::sub_with_overflow | sym::mul_with_overflow => {
 321                 (1, vec![param(0), param(0)], tcx.intern_tup(&[param(0), tcx.types.bool]))
 322             }
 323
 324             sym::ptr_guaranteed_cmp => {
 325                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.u8)
 326             }
 327
 328             sym::const_allocate => {
 329                 (0, vec![tcx.types.usize, tcx.types.usize], tcx.mk_mut_ptr(tcx.types.u8))
 330             }
 331             sym::const_deallocate => (
 332                 0,
 333                 vec![tcx.mk_mut_ptr(tcx.types.u8), tcx.types.usize, tcx.types.usize],
 334                 tcx.mk_unit(),
 335             ),
 336
 337             sym::ptr_offset_from => {
 338                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.isize)
 339             }
 340             sym::ptr_offset_from_unsigned => {
 341                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.usize)
 342             }
 343             sym::unchecked_div | sym::unchecked_rem | sym::exact_div => {
 344                 (1, vec![param(0), param(0)], param(0))
 345             }
 346             sym::unchecked_shl | sym::unchecked_shr | sym::rotate_left | sym::rotate_right => {
 347                 (1, vec![param(0), param(0)], param(0))
 348             }
 349             sym::unchecked_add | sym::unchecked_sub | sym::unchecked_mul => {
 350                 (1, vec![param(0), param(0)], param(0))
 351             }
 352             sym::wrapping_add | sym::wrapping_sub | sym::wrapping_mul => {
 353                 (1, vec![param(0), param(0)], param(0))
 354             }
 355             sym::saturating_add | sym::saturating_sub => (1, vec![param(0), param(0)], param(0)),
 356             sym::fadd_fast | sym::fsub_fast | sym::fmul_fast | sym::fdiv_fast | sym::frem_fast => {
 357                 (1, vec![param(0), param(0)], param(0))
 358             }
 359             sym::float_to_int_unchecked => (2, vec![param(0)], param(1)),
 360
 361             sym::assume => (0, vec![tcx.types.bool], tcx.mk_unit()),
 362             sym::likely => (0, vec![tcx.types.bool], tcx.types.bool),
 363             sym::unlikely => (0, vec![tcx.types.bool], tcx.types.bool),
 364
 365             sym::discriminant_value => {
 366                 let assoc_items = tcx.associated_item_def_ids(
 367                     tcx.require_lang_item(hir::LangItem::DiscriminantKind, None),
 368                 );
 369                 let discriminant_def_id = assoc_items[0];
 370
 371                 let br =
 372                     ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) };
 373                 (
 374                     1,
 375                     vec![
 376                         tcx.mk_imm_ref(tcx.mk_region(ty::ReLateBound(ty::INNERMOST, br)), param(0)),
 377                     ],
 378                     tcx.mk_projection(discriminant_def_id, tcx.mk_substs([param(0).into()].iter())),
 379                 )
 380             }
 381
 382             kw::Try => {
 383                 let mut_u8 = tcx.mk_mut_ptr(tcx.types.u8);
 384                 let try_fn_ty = ty::Binder::dummy(tcx.mk_fn_sig(
 385                     iter::once(mut_u8),
 386                     tcx.mk_unit(),
 387                     false,
 388                     hir::Unsafety::Normal,
 389                     Abi::Rust,
 390                 ));
 391                 let catch_fn_ty = ty::Binder::dummy(tcx.mk_fn_sig(
 392                     [mut_u8, mut_u8].iter().cloned(),
 393                     tcx.mk_unit(),
 394                     false,
 395                     hir::Unsafety::Normal,
 396                     Abi::Rust,
 397                 ));
 398                 (
 399                     0,
 400                     vec![tcx.mk_fn_ptr(try_fn_ty), mut_u8, tcx.mk_fn_ptr(catch_fn_ty)],
 401                     tcx.types.i32,
 402                 )
 403             }
 404
 405             sym::va_start | sym::va_end => match mk_va_list_ty(hir::Mutability::Mut) {
 406                 Some((va_list_ref_ty, _)) => (0, vec![va_list_ref_ty], tcx.mk_unit()),
 407                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 408             },
 409
 410             sym::va_copy => match mk_va_list_ty(hir::Mutability::Not) {
 411                 Some((va_list_ref_ty, va_list_ty)) => {
 412                     let va_list_ptr_ty = tcx.mk_mut_ptr(va_list_ty);
 413                     (0, vec![va_list_ptr_ty, va_list_ref_ty], tcx.mk_unit())
 414                 }
 415                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 416             },
 417
 418             sym::va_arg => match mk_va_list_ty(hir::Mutability::Mut) {
 419                 Some((va_list_ref_ty, _)) => (1, vec![va_list_ref_ty], param(0)),
 420                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 421             },
 422
 423             sym::nontemporal_store => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit()),
 424
 425             sym::raw_eq => {
 426                 let br =
 427                     ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) };
 428                 let param_ty =
 429                     tcx.mk_imm_ref(tcx.mk_region(ty::ReLateBound(ty::INNERMOST, br)), param(0));
 430                 (1, vec![param_ty; 2], tcx.types.bool)
 431             }
 432
 433             sym::black_box => (1, vec![param(0)], param(0)),
 434
 435             sym::const_eval_select => (4, vec![param(0), param(1), param(2)], param(3)),
 436
 437             sym::vtable_size | sym::vtable_align => {
 438                 (0, vec![tcx.mk_imm_ptr(tcx.mk_unit())], tcx.types.usize)
 439             }
 440
 441             other => {
 442                 tcx.sess.emit_err(UnrecognizedIntrinsicFunction { span: it.span, name: other });
 443                 return;
 444             }
 445         };
 446         (n_tps, 0, inputs, output, unsafety)
 447     };
 448     let sig = tcx.mk_fn_sig(inputs.into_iter(), output, false, unsafety, Abi::RustIntrinsic);
 449     let sig = ty::Binder::bind_with_vars(sig, bound_vars);
 450     equate_intrinsic_type(tcx, it, n_tps, n_lts, sig)
 451 }
 452
 453 /// Type-check `extern "platform-intrinsic" { ... }` functions.
 454 pub fn check_platform_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
 455     let param = |n| {
 456         let name = Symbol::intern(&format!("P{}", n));
 457         tcx.mk_ty_param(n, name)
 458     };
 459
 460     let name = it.ident.name;
 461
 462     let (n_tps, inputs, output) = match name {
 463         sym::simd_eq | sym::simd_ne | sym::simd_lt | sym::simd_le | sym::simd_gt | sym::simd_ge => {
 464             (2, vec![param(0), param(0)], param(1))
 465         }
 466         sym::simd_add
 467         | sym::simd_sub
 468         | sym::simd_mul
 469         | sym::simd_rem
 470         | sym::simd_div
 471         | sym::simd_shl
 472         | sym::simd_shr
 473         | sym::simd_and
 474         | sym::simd_or
 475         | sym::simd_xor
 476         | sym::simd_fmin
 477         | sym::simd_fmax
 478         | sym::simd_fpow
 479         | sym::simd_saturating_add
 480         | sym::simd_saturating_sub => (1, vec![param(0), param(0)], param(0)),
 481         sym::simd_arith_offset => (2, vec![param(0), param(1)], param(0)),
 482         sym::simd_neg
 483         | sym::simd_fsqrt
 484         | sym::simd_fsin
 485         | sym::simd_fcos
 486         | sym::simd_fexp
 487         | sym::simd_fexp2
 488         | sym::simd_flog2
 489         | sym::simd_flog10
 490         | sym::simd_flog
 491         | sym::simd_fabs
 492         | sym::simd_ceil
 493         | sym::simd_floor
 494         | sym::simd_round
 495         | sym::simd_trunc => (1, vec![param(0)], param(0)),
 496         sym::simd_fpowi => (1, vec![param(0), tcx.types.i32], param(0)),
 497         sym::simd_fma => (1, vec![param(0), param(0), param(0)], param(0)),
 498         sym::simd_gather => (3, vec![param(0), param(1), param(2)], param(0)),
 499         sym::simd_scatter => (3, vec![param(0), param(1), param(2)], tcx.mk_unit()),
 500         sym::simd_insert => (2, vec![param(0), tcx.types.u32, param(1)], param(0)),
 501         sym::simd_extract => (2, vec![param(0), tcx.types.u32], param(1)),
 502         sym::simd_cast
 503         | sym::simd_as
 504         | sym::simd_cast_ptr
 505         | sym::simd_expose_addr
 506         | sym::simd_from_exposed_addr => (2, vec![param(0)], param(1)),
 507         sym::simd_bitmask => (2, vec![param(0)], param(1)),
 508         sym::simd_select | sym::simd_select_bitmask => {
 509             (2, vec![param(0), param(1), param(1)], param(1))
 510         }
 511         sym::simd_reduce_all | sym::simd_reduce_any => (1, vec![param(0)], tcx.types.bool),
 512         sym::simd_reduce_add_ordered | sym::simd_reduce_mul_ordered => {
 513             (2, vec![param(0), param(1)], param(1))
 514         }
 515         sym::simd_reduce_add_unordered
 516         | sym::simd_reduce_mul_unordered
 517         | sym::simd_reduce_and
 518         | sym::simd_reduce_or
 519         | sym::simd_reduce_xor
 520         | sym::simd_reduce_min
 521         | sym::simd_reduce_max
 522         | sym::simd_reduce_min_nanless
 523         | sym::simd_reduce_max_nanless => (2, vec![param(0)], param(1)),
 524         sym::simd_shuffle => (3, vec![param(0), param(0), param(1)], param(2)),
 525         name if name.as_str().starts_with("simd_shuffle") => {
 526             match name.as_str()["simd_shuffle".len()..].parse() {
 527                 Ok(n) => {
 528                     let params = vec![param(0), param(0), tcx.mk_array(tcx.types.u32, n)];
 529                     (2, params, param(1))
 530                 }
 531                 Err(_) => {
 532                     let msg =
 533                         format!("unrecognized platform-specific intrinsic function: `{name}`");
 534                     tcx.sess.struct_span_err(it.span, &msg).emit();
 535                     return;
 536                 }
 537             }
 538         }
 539         _ => {
 540             let msg = format!("unrecognized platform-specific intrinsic function: `{name}`");
 541             tcx.sess.struct_span_err(it.span, &msg).emit();
 542             return;
 543         }
 544     };
 545
 546     let sig = tcx.mk_fn_sig(
 547         inputs.into_iter(),
 548         output,
 549         false,
 550         hir::Unsafety::Unsafe,
 551         Abi::PlatformIntrinsic,
 552     );
 553     let sig = ty::Binder::dummy(sig);
 554     equate_intrinsic_type(tcx, it, n_tps, 0, sig)
 555 }