src/intrinsics.rs

   1 use crate::prelude::*;
   2
   3 use rustc::ty::subst::SubstsRef;
   4
   5 macro_rules! intrinsic_pat {
   6     (_) => {
   7         _
   8     };
   9     ($name:ident) => {
  10         stringify!($name)
  11     }
  12 }
  13
  14 macro_rules! intrinsic_arg {
  15     (c $fx:expr, $arg:ident) => {
  16         $arg
  17     };
  18     (v $fx:expr, $arg:ident) => {
  19         $arg.load_scalar($fx)
  20     };
  21 }
  22
  23 macro_rules! intrinsic_substs {
  24     ($substs:expr, $index:expr,) => {};
  25     ($substs:expr, $index:expr, $first:ident $(,$rest:ident)*) => {
  26         let $first = $substs.type_at($index);
  27         intrinsic_substs!($substs, $index+1, $($rest),*);
  28     };
  29 }
  30
  31 macro_rules! intrinsic_match {
  32     ($fx:expr, $intrinsic:expr, $substs:expr, $args:expr, $(
  33         $($name:tt)|+ $(if $cond:expr)?, $(<$($subst:ident),*>)? ($($a:ident $arg:ident),*) $content:block;
  34     )*) => {
  35         match $intrinsic {
  36             $(
  37                 $(intrinsic_pat!($name))|* $(if $cond)? => {
  38                     #[allow(unused_parens, non_snake_case)]
  39                     {
  40                         $(
  41                             intrinsic_substs!($substs, 0, $($subst),*);
  42                         )?
  43                         if let [$($arg),*] = *$args {
  44                             let ($($arg),*) = (
  45                                 $(intrinsic_arg!($a $fx, $arg)),*
  46                             );
  47                             #[warn(unused_parens, non_snake_case)]
  48                             {
  49                                 $content
  50                             }
  51                         } else {
  52                             bug!("wrong number of args for intrinsic {:?}", $intrinsic);
  53                         }
  54                     }
  55                 }
  56             )*
  57             _ => unimpl!("unsupported intrinsic {}", $intrinsic),
  58         }
  59     };
  60 }
  61
  62 macro_rules! call_intrinsic_match {
  63     ($fx:expr, $intrinsic:expr, $substs:expr, $ret:expr, $destination:expr, $args:expr, $(
  64         $name:ident($($arg:ident),*) -> $ty:ident => $func:ident,
  65     )*) => {
  66         match $intrinsic {
  67             $(
  68                 stringify!($name) => {
  69                     assert!($substs.is_noop());
  70                     if let [$($arg),*] = *$args {
  71                         let res = $fx.easy_call(stringify!($func), &[$($arg),*], $fx.tcx.types.$ty);
  72                         $ret.write_cvalue($fx, res);
  73
  74                         if let Some((_, dest)) = $destination {
  75                             let ret_ebb = $fx.get_ebb(dest);
  76                             $fx.bcx.ins().jump(ret_ebb, &[]);
  77                             return;
  78                         } else {
  79                             unreachable!();
  80                         }
  81                     } else {
  82                         bug!("wrong number of args for intrinsic {:?}", $intrinsic);
  83                     }
  84                 }
  85             )*
  86             _ => {}
  87         }
  88     }
  89 }
  90
  91 macro_rules! atomic_binop_return_old {
  92     ($fx:expr, $op:ident<$T:ident>($ptr:ident, $src:ident) -> $ret:ident) => {
  93         let clif_ty = $fx.clif_type($T).unwrap();
  94         let old = $fx.bcx.ins().load(clif_ty, MemFlags::new(), $ptr, 0);
  95         let new = $fx.bcx.ins().$op(old, $src);
  96         $fx.bcx.ins().store(MemFlags::new(), new, $ptr, 0);
  97         $ret.write_cvalue($fx, CValue::by_val(old, $fx.layout_of($T)));
  98     };
  99 }
 100
 101 macro_rules! atomic_minmax {
 102     ($fx:expr, $cc:expr, <$T:ident> ($ptr:ident, $src:ident) -> $ret:ident) => {
 103         // Read old
 104         let clif_ty = $fx.clif_type($T).unwrap();
 105         let old = $fx.bcx.ins().load(clif_ty, MemFlags::new(), $ptr, 0);
 106
 107         // Compare
 108         let is_eq = $fx.bcx.ins().icmp(IntCC::SignedGreaterThan, old, $src);
 109         let new = crate::common::codegen_select(&mut $fx.bcx, is_eq, old, $src);
 110
 111         // Write new
 112         $fx.bcx.ins().store(MemFlags::new(), new, $ptr, 0);
 113
 114         let ret_val = CValue::by_val(old, $ret.layout());
 115         $ret.write_cvalue($fx, ret_val);
 116     };
 117 }
 118
 119 fn lane_type_and_count<'tcx>(
 120     fx: &FunctionCx<'_, 'tcx, impl Backend>,
 121     layout: TyLayout<'tcx>,
 122     intrinsic: &str,
 123 ) -> (TyLayout<'tcx>, usize) {
 124     let lane_count = match layout.fields {
 125         layout::FieldPlacement::Array { stride: _, count } => usize::try_from(count).unwrap(),
 126         _ => panic!("Non vector type {:?} passed to or returned from simd_* intrinsic {}", layout.ty, intrinsic),
 127     };
 128     let lane_layout = layout.field(fx, 0);
 129     (lane_layout, lane_count)
 130 }
 131
 132 fn simd_for_each_lane<'tcx, B: Backend>(
 133     fx: &mut FunctionCx<'_, 'tcx, B>,
 134     intrinsic: &str,
 135     x: CValue<'tcx>,
 136     y: CValue<'tcx>,
 137     ret: CPlace<'tcx>,
 138     f: impl Fn(&mut FunctionCx<'_, 'tcx, B>, TyLayout<'tcx>, TyLayout<'tcx>, Value, Value) -> CValue<'tcx>,
 139 ) {
 140     assert_eq!(x.layout(), y.layout());
 141     let layout = x.layout();
 142
 143     let (lane_layout, lane_count) = lane_type_and_count(fx, layout, intrinsic);
 144     let (ret_lane_layout, ret_lane_count) = lane_type_and_count(fx, ret.layout(), intrinsic);
 145     assert_eq!(lane_count, ret_lane_count);
 146
 147     for lane in 0..lane_count {
 148         let lane = mir::Field::new(lane);
 149         let x_lane = x.value_field(fx, lane).load_scalar(fx);
 150         let y_lane = y.value_field(fx, lane).load_scalar(fx);
 151
 152         let res_lane = f(fx, lane_layout, ret_lane_layout, x_lane, y_lane);
 153
 154         ret.place_field(fx, lane).write_cvalue(fx, res_lane);
 155     }
 156 }
 157
 158 macro_rules! simd_binop {
 159     ($fx:expr, $intrinsic:expr, $op:ident($x:ident, $y:ident) -> $ret:ident) => {
 160         simd_for_each_lane($fx, $intrinsic, $x, $y, $ret, |fx, _lane_layout, ret_lane_layout, x_lane, y_lane| {
 161             let res_lane = fx.bcx.ins().$op(x_lane, y_lane);
 162             CValue::by_val(res_lane, ret_lane_layout)
 163         });
 164     };
 165     ($fx:expr, $intrinsic:expr, $op_u:ident|$op_s:ident($x:ident, $y:ident) -> $ret:ident) => {
 166         simd_for_each_lane($fx, $intrinsic, $x, $y, $ret, |fx, lane_layout, ret_lane_layout, x_lane, y_lane| {
 167             let res_lane = match lane_layout.ty.sty {
 168                 ty::Uint(_) => fx.bcx.ins().$op_u(x_lane, y_lane),
 169                 ty::Int(_) => fx.bcx.ins().$op_s(x_lane, y_lane),
 170                 _ => unreachable!("{:?}", lane_layout.ty),
 171             };
 172             CValue::by_val(res_lane, ret_lane_layout)
 173         });
 174     };
 175 }
 176
 177 pub fn codegen_intrinsic_call<'a, 'tcx: 'a>(
 178     fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
 179     def_id: DefId,
 180     substs: SubstsRef<'tcx>,
 181     args: Vec<CValue<'tcx>>,
 182     destination: Option<(CPlace<'tcx>, BasicBlock)>,
 183 ) {
 184     let intrinsic = fx.tcx.item_name(def_id).as_str();
 185     let intrinsic = &intrinsic[..];
 186
 187     let ret = match destination {
 188         Some((place, _)) => place,
 189         None => {
 190             // Insert non returning intrinsics here
 191             match intrinsic {
 192                 "abort" => {
 193                     trap_panic(fx, "Called intrinsic::abort.");
 194                 }
 195                 "unreachable" => {
 196                     trap_unreachable(fx, "[corruption] Called intrinsic::unreachable.");
 197                 }
 198                 _ => unimplemented!("unsupported instrinsic {}", intrinsic),
 199             }
 200             return;
 201         }
 202     };
 203
 204     let u64_layout = fx.layout_of(fx.tcx.types.u64);
 205     let usize_layout = fx.layout_of(fx.tcx.types.usize);
 206
 207     call_intrinsic_match! {
 208         fx, intrinsic, substs, ret, destination, args,
 209         expf32(flt) -> f32 => expf,
 210         expf64(flt) -> f64 => exp,
 211         exp2f32(flt) -> f32 => exp2f,
 212         exp2f64(flt) -> f64 => exp2,
 213         sqrtf32(flt) -> f32 => sqrtf,
 214         sqrtf64(flt) -> f64 => sqrt,
 215         powif32(a, x) -> f32 => __powisf2, // compiler-builtins
 216         powif64(a, x) -> f64 => __powidf2, // compiler-builtins
 217         logf32(flt) -> f32 => logf,
 218         logf64(flt) -> f64 => log,
 219         fabsf32(flt) -> f32 => fabsf,
 220         fabsf64(flt) -> f64 => fabs,
 221         fmaf32(x, y, z) -> f32 => fmaf,
 222         fmaf64(x, y, z) -> f64 => fma,
 223
 224         // rounding variants
 225         floorf32(flt) -> f32 => floorf,
 226         floorf64(flt) -> f64 => floor,
 227         ceilf32(flt) -> f32 => ceilf,
 228         ceilf64(flt) -> f64 => ceil,
 229         truncf32(flt) -> f32 => truncf,
 230         truncf64(flt) -> f64 => trunc,
 231         roundf32(flt) -> f32 => roundf,
 232         roundf64(flt) -> f64 => round,
 233
 234         // trigonometry
 235         sinf32(flt) -> f32 => sinf,
 236         sinf64(flt) -> f64 => sin,
 237         cosf32(flt) -> f32 => cosf,
 238         cosf64(flt) -> f64 => cos,
 239         tanf32(flt) -> f32 => tanf,
 240         tanf64(flt) -> f64 => tan,
 241     }
 242
 243     intrinsic_match! {
 244         fx, intrinsic, substs, args,
 245
 246         assume, (c _a) {};
 247         likely | unlikely, (c a) {
 248             ret.write_cvalue(fx, a);
 249         };
 250         breakpoint, () {
 251             fx.bcx.ins().debugtrap();
 252         };
 253         copy | copy_nonoverlapping, <elem_ty> (v src, v dst, v count) {
 254             let elem_size: u64 = fx.layout_of(elem_ty).size.bytes();
 255             let elem_size = fx
 256                 .bcx
 257                 .ins()
 258                 .iconst(fx.pointer_type, elem_size as i64);
 259             assert_eq!(args.len(), 3);
 260             let byte_amount = fx.bcx.ins().imul(count, elem_size);
 261
 262             if intrinsic.ends_with("_nonoverlapping") {
 263                 fx.bcx.call_memcpy(fx.module.target_config(), dst, src, byte_amount);
 264             } else {
 265                 fx.bcx.call_memmove(fx.module.target_config(), dst, src, byte_amount);
 266             }
 267         };
 268         discriminant_value, (c val) {
 269             let pointee_layout = fx.layout_of(val.layout().ty.builtin_deref(true).unwrap().ty);
 270             let place = CPlace::for_addr(val.load_scalar(fx), pointee_layout);
 271             let discr = crate::base::trans_get_discriminant(fx, place, ret.layout());
 272             ret.write_cvalue(fx, discr);
 273         };
 274         size_of, <T> () {
 275             let size_of = fx.layout_of(T).size.bytes();
 276             let size_of = CValue::const_val(fx, usize_layout.ty, size_of.into());
 277             ret.write_cvalue(fx, size_of);
 278         };
 279         size_of_val, <T> (c ptr) {
 280             let layout = fx.layout_of(T);
 281             let size = if layout.is_unsized() {
 282                 let (_ptr, info) = ptr.load_scalar_pair(fx);
 283                 let (size, _align) = crate::unsize::size_and_align_of_dst(fx, layout.ty, info);
 284                 size
 285             } else {
 286                 fx
 287                     .bcx
 288                     .ins()
 289                     .iconst(fx.pointer_type, layout.size.bytes() as i64)
 290             };
 291             ret.write_cvalue(fx, CValue::by_val(size, usize_layout));
 292         };
 293         min_align_of, <T> () {
 294             let min_align = fx.layout_of(T).align.abi.bytes();
 295             let min_align = CValue::const_val(fx, usize_layout.ty, min_align.into());
 296             ret.write_cvalue(fx, min_align);
 297         };
 298         min_align_of_val, <T> (c ptr) {
 299             let layout = fx.layout_of(T);
 300             let align = if layout.is_unsized() {
 301                 let (_ptr, info) = ptr.load_scalar_pair(fx);
 302                 let (_size, align) = crate::unsize::size_and_align_of_dst(fx, layout.ty, info);
 303                 align
 304             } else {
 305                 fx
 306                     .bcx
 307                     .ins()
 308                     .iconst(fx.pointer_type, layout.align.abi.bytes() as i64)
 309             };
 310             ret.write_cvalue(fx, CValue::by_val(align, usize_layout));
 311         };
 312         pref_align_of, <T> () {
 313             let pref_align = fx.layout_of(T).align.pref.bytes();
 314             let pref_align = CValue::const_val(fx, usize_layout.ty, pref_align.into());
 315             ret.write_cvalue(fx, pref_align);
 316         };
 317
 318
 319         type_id, <T> () {
 320             let type_id = fx.tcx.type_id_hash(T);
 321             let type_id = CValue::const_val(fx, u64_layout.ty, type_id.into());
 322             ret.write_cvalue(fx, type_id);
 323         };
 324         type_name, <T> () {
 325             let type_name = fx.tcx.type_name(T);
 326             let type_name = crate::constant::trans_const_value(fx, type_name);
 327             ret.write_cvalue(fx, type_name);
 328         };
 329
 330         _ if intrinsic.starts_with("unchecked_") || intrinsic == "exact_div", (c x, c y) {
 331             // FIXME trap on overflow
 332             let bin_op = match intrinsic {
 333                 "unchecked_sub" => BinOp::Sub,
 334                 "unchecked_div" | "exact_div" => BinOp::Div,
 335                 "unchecked_rem" => BinOp::Rem,
 336                 "unchecked_shl" => BinOp::Shl,
 337                 "unchecked_shr" => BinOp::Shr,
 338                 _ => unimplemented!("intrinsic {}", intrinsic),
 339             };
 340             let res = match ret.layout().ty.sty {
 341                 ty::Uint(_) => crate::base::trans_int_binop(
 342                     fx,
 343                     bin_op,
 344                     x,
 345                     y,
 346                     ret.layout().ty,
 347                     false,
 348                 ),
 349                 ty::Int(_) => crate::base::trans_int_binop(
 350                     fx,
 351                     bin_op,
 352                     x,
 353                     y,
 354                     ret.layout().ty,
 355                     true,
 356                 ),
 357                 _ => panic!(),
 358             };
 359             ret.write_cvalue(fx, res);
 360         };
 361         _ if intrinsic.ends_with("_with_overflow"), <T> (c x, c y) {
 362             assert_eq!(x.layout().ty, y.layout().ty);
 363             let bin_op = match intrinsic {
 364                 "add_with_overflow" => BinOp::Add,
 365                 "sub_with_overflow" => BinOp::Sub,
 366                 "mul_with_overflow" => BinOp::Mul,
 367                 _ => unimplemented!("intrinsic {}", intrinsic),
 368             };
 369             let res = match T.sty {
 370                 ty::Uint(_) => crate::base::trans_checked_int_binop(
 371                     fx,
 372                     bin_op,
 373                     x,
 374                     y,
 375                     ret.layout().ty,
 376                     false,
 377                 ),
 378                 ty::Int(_) => crate::base::trans_checked_int_binop(
 379                     fx,
 380                     bin_op,
 381                     x,
 382                     y,
 383                     ret.layout().ty,
 384                     true,
 385                 ),
 386                 _ => panic!(),
 387             };
 388             ret.write_cvalue(fx, res);
 389         };
 390         _ if intrinsic.starts_with("overflowing_"), <T> (c x, c y) {
 391             assert_eq!(x.layout().ty, y.layout().ty);
 392             let bin_op = match intrinsic {
 393                 "overflowing_add" => BinOp::Add,
 394                 "overflowing_sub" => BinOp::Sub,
 395                 "overflowing_mul" => BinOp::Mul,
 396                 _ => unimplemented!("intrinsic {}", intrinsic),
 397             };
 398             let res = match T.sty {
 399                 ty::Uint(_) => crate::base::trans_int_binop(
 400                     fx,
 401                     bin_op,
 402                     x,
 403                     y,
 404                     ret.layout().ty,
 405                     false,
 406                 ),
 407                 ty::Int(_) => crate::base::trans_int_binop(
 408                     fx,
 409                     bin_op,
 410                     x,
 411                     y,
 412                     ret.layout().ty,
 413                     true,
 414                 ),
 415                 _ => panic!(),
 416             };
 417             ret.write_cvalue(fx, res);
 418         };
 419         _ if intrinsic.starts_with("saturating_"), <T> (c x, c y) {
 420             // FIXME implement saturating behavior
 421             assert_eq!(x.layout().ty, y.layout().ty);
 422             let bin_op = match intrinsic {
 423                 "saturating_add" => BinOp::Add,
 424                 "saturating_sub" => BinOp::Sub,
 425                 "saturating_mul" => BinOp::Mul,
 426                 _ => unimplemented!("intrinsic {}", intrinsic),
 427             };
 428             let res = match T.sty {
 429                 ty::Uint(_) => crate::base::trans_int_binop(
 430                     fx,
 431                     bin_op,
 432                     x,
 433                     y,
 434                     ret.layout().ty,
 435                     false,
 436                 ),
 437                 ty::Int(_) => crate::base::trans_int_binop(
 438                     fx,
 439                     bin_op,
 440                     x,
 441                     y,
 442                     ret.layout().ty,
 443                     true,
 444                 ),
 445                 _ => panic!(),
 446             };
 447             ret.write_cvalue(fx, res);
 448         };
 449         rotate_left, <T>(v x, v y) {
 450             let layout = fx.layout_of(T);
 451             let res = fx.bcx.ins().rotl(x, y);
 452             ret.write_cvalue(fx, CValue::by_val(res, layout));
 453         };
 454         rotate_right, <T>(v x, v y) {
 455             let layout = fx.layout_of(T);
 456             let res = fx.bcx.ins().rotr(x, y);
 457             ret.write_cvalue(fx, CValue::by_val(res, layout));
 458         };
 459
 460         // The only difference between offset and arith_offset is regarding UB. Because Cranelift
 461         // doesn't have UB both are codegen'ed the same way
 462         offset | arith_offset, (c base, v offset) {
 463             let pointee_ty = base.layout().ty.builtin_deref(true).unwrap().ty;
 464             let pointee_size = fx.layout_of(pointee_ty).size.bytes();
 465             let ptr_diff = fx.bcx.ins().imul_imm(offset, pointee_size as i64);
 466             let base_val = base.load_scalar(fx);
 467             let res = fx.bcx.ins().iadd(base_val, ptr_diff);
 468             ret.write_cvalue(fx, CValue::by_val(res, args[0].layout()));
 469         };
 470
 471         transmute, <src_ty, dst_ty> (c from) {
 472             assert_eq!(from.layout().ty, src_ty);
 473             let addr = from.force_stack(fx);
 474             let dst_layout = fx.layout_of(dst_ty);
 475             ret.write_cvalue(fx, CValue::by_ref(addr, dst_layout))
 476         };
 477         init, () {
 478             if ret.layout().abi == Abi::Uninhabited {
 479                 crate::trap::trap_panic(fx, "[panic] Called intrinsic::init for uninhabited type.");
 480                 return;
 481             }
 482
 483             match ret {
 484                 CPlace::NoPlace(_layout) => {}
 485                 CPlace::Var(var, layout) => {
 486                     let clif_ty = fx.clif_type(layout.ty).unwrap();
 487                     let val = match clif_ty {
 488                         types::I8 | types::I16 | types::I32 | types::I64 => fx.bcx.ins().iconst(clif_ty, 0),
 489                         types::F32 => {
 490                             let zero = fx.bcx.ins().iconst(types::I32, 0);
 491                             fx.bcx.ins().bitcast(types::F32, zero)
 492                         }
 493                         types::F64 => {
 494                             let zero = fx.bcx.ins().iconst(types::I64, 0);
 495                             fx.bcx.ins().bitcast(types::F64, zero)
 496                         }
 497                         _ => panic!("clif_type returned {}", clif_ty),
 498                     };
 499                     fx.bcx.def_var(mir_var(var), val);
 500                 }
 501                 _ => {
 502                     let addr = ret.to_addr(fx);
 503                     let layout = ret.layout();
 504                     fx.bcx.emit_small_memset(fx.module.target_config(), addr, 0, layout.size.bytes(), 1);
 505                 }
 506             }
 507         };
 508         write_bytes, (c dst, v val, v count) {
 509             let pointee_ty = dst.layout().ty.builtin_deref(true).unwrap().ty;
 510             let pointee_size = fx.layout_of(pointee_ty).size.bytes();
 511             let count = fx.bcx.ins().imul_imm(count, pointee_size as i64);
 512             let dst_ptr = dst.load_scalar(fx);
 513             fx.bcx.call_memset(fx.module.target_config(), dst_ptr, val, count);
 514         };
 515         ctlz | ctlz_nonzero, <T> (v arg) {
 516             let res = if T == fx.tcx.types.u128 || T == fx.tcx.types.i128 {
 517                 // FIXME verify this algorithm is correct
 518                 let (lsb, msb) = fx.bcx.ins().isplit(arg);
 519                 let lsb_lz = fx.bcx.ins().clz(lsb);
 520                 let msb_lz = fx.bcx.ins().clz(msb);
 521                 let msb_is_zero = fx.bcx.ins().icmp_imm(IntCC::Equal, msb, 0);
 522                 let lsb_lz_plus_64 = fx.bcx.ins().iadd_imm(lsb_lz, 64);
 523                 fx.bcx.ins().select(msb_is_zero, lsb_lz_plus_64, msb_lz)
 524             } else {
 525                 fx.bcx.ins().clz(arg)
 526             };
 527             let res = CValue::by_val(res, fx.layout_of(T));
 528             ret.write_cvalue(fx, res);
 529         };
 530         cttz | cttz_nonzero, <T> (v arg) {
 531             let res = if T == fx.tcx.types.u128 || T == fx.tcx.types.i128 {
 532                 // FIXME verify this algorithm is correct
 533                 let (lsb, msb) = fx.bcx.ins().isplit(arg);
 534                 let lsb_tz = fx.bcx.ins().ctz(lsb);
 535                 let msb_tz = fx.bcx.ins().ctz(msb);
 536                 let lsb_is_zero = fx.bcx.ins().icmp_imm(IntCC::Equal, lsb, 0);
 537                 let msb_tz_plus_64 = fx.bcx.ins().iadd_imm(msb_tz, 64);
 538                 fx.bcx.ins().select(lsb_is_zero, msb_tz_plus_64, lsb_tz)
 539             } else {
 540                 fx.bcx.ins().ctz(arg)
 541             };
 542             let res = CValue::by_val(res, fx.layout_of(T));
 543             ret.write_cvalue(fx, res);
 544         };
 545         ctpop, <T> (v arg) {
 546             let res = CValue::by_val(fx.bcx.ins().popcnt(arg), fx.layout_of(T));
 547             ret.write_cvalue(fx, res);
 548         };
 549         bitreverse, <T> (v arg) {
 550             let res = CValue::by_val(fx.bcx.ins().bitrev(arg), fx.layout_of(T));
 551             ret.write_cvalue(fx, res);
 552         };
 553         bswap, <T> (v arg) {
 554             // FIXME(CraneStation/cranelift#794) add bswap instruction to cranelift
 555             fn swap(bcx: &mut FunctionBuilder, v: Value) -> Value {
 556                 match bcx.func.dfg.value_type(v) {
 557                     types::I8 => v,
 558
 559                     // https://code.woboq.org/gcc/include/bits/byteswap.h.html
 560                     types::I16 => {
 561                         let tmp1 = bcx.ins().ishl_imm(v, 8);
 562                         let n1 = bcx.ins().band_imm(tmp1, 0xFF00);
 563
 564                         let tmp2 = bcx.ins().ushr_imm(v, 8);
 565                         let n2 = bcx.ins().band_imm(tmp2, 0x00FF);
 566
 567                         bcx.ins().bor(n1, n2)
 568                     }
 569                     types::I32 => {
 570                         let tmp1 = bcx.ins().ishl_imm(v, 24);
 571                         let n1 = bcx.ins().band_imm(tmp1, 0xFF00_0000);
 572
 573                         let tmp2 = bcx.ins().ishl_imm(v, 8);
 574                         let n2 = bcx.ins().band_imm(tmp2, 0x00FF_0000);
 575
 576                         let tmp3 = bcx.ins().ushr_imm(v, 8);
 577                         let n3 = bcx.ins().band_imm(tmp3, 0x0000_FF00);
 578
 579                         let tmp4 = bcx.ins().ushr_imm(v, 24);
 580                         let n4 = bcx.ins().band_imm(tmp4, 0x0000_00FF);
 581
 582                         let or_tmp1 = bcx.ins().bor(n1, n2);
 583                         let or_tmp2 = bcx.ins().bor(n3, n4);
 584                         bcx.ins().bor(or_tmp1, or_tmp2)
 585                     }
 586                     types::I64 => {
 587                         let tmp1 = bcx.ins().ishl_imm(v, 56);
 588                         let n1 = bcx.ins().band_imm(tmp1, 0xFF00_0000_0000_0000u64 as i64);
 589
 590                         let tmp2 = bcx.ins().ishl_imm(v, 40);
 591                         let n2 = bcx.ins().band_imm(tmp2, 0x00FF_0000_0000_0000u64 as i64);
 592
 593                         let tmp3 = bcx.ins().ishl_imm(v, 24);
 594                         let n3 = bcx.ins().band_imm(tmp3, 0x0000_FF00_0000_0000u64 as i64);
 595
 596                         let tmp4 = bcx.ins().ishl_imm(v, 8);
 597                         let n4 = bcx.ins().band_imm(tmp4, 0x0000_00FF_0000_0000u64 as i64);
 598
 599                         let tmp5 = bcx.ins().ushr_imm(v, 8);
 600                         let n5 = bcx.ins().band_imm(tmp5, 0x0000_0000_FF00_0000u64 as i64);
 601
 602                         let tmp6 = bcx.ins().ushr_imm(v, 24);
 603                         let n6 = bcx.ins().band_imm(tmp6, 0x0000_0000_00FF_0000u64 as i64);
 604
 605                         let tmp7 = bcx.ins().ushr_imm(v, 40);
 606                         let n7 = bcx.ins().band_imm(tmp7, 0x0000_0000_0000_FF00u64 as i64);
 607
 608                         let tmp8 = bcx.ins().ushr_imm(v, 56);
 609                         let n8 = bcx.ins().band_imm(tmp8, 0x0000_0000_0000_00FFu64 as i64);
 610
 611                         let or_tmp1 = bcx.ins().bor(n1, n2);
 612                         let or_tmp2 = bcx.ins().bor(n3, n4);
 613                         let or_tmp3 = bcx.ins().bor(n5, n6);
 614                         let or_tmp4 = bcx.ins().bor(n7, n8);
 615
 616                         let or_tmp5 = bcx.ins().bor(or_tmp1, or_tmp2);
 617                         let or_tmp6 = bcx.ins().bor(or_tmp3, or_tmp4);
 618                         bcx.ins().bor(or_tmp5, or_tmp6)
 619                     }
 620                     types::I128 => {
 621                         let (lo, hi) = bcx.ins().isplit(v);
 622                         let lo = swap(bcx, lo);
 623                         let hi = swap(bcx, hi);
 624                         bcx.ins().iconcat(hi, lo)
 625                     }
 626                     ty => unimplemented!("bswap {}", ty),
 627                 }
 628             };
 629             let res = CValue::by_val(swap(&mut fx.bcx, arg), fx.layout_of(T));
 630             ret.write_cvalue(fx, res);
 631         };
 632         needs_drop, <T> () {
 633             let needs_drop = if T.needs_drop(fx.tcx, ParamEnv::reveal_all()) {
 634                 1
 635             } else {
 636                 0
 637             };
 638             let needs_drop = CValue::const_val(fx, fx.tcx.types.bool, needs_drop);
 639             ret.write_cvalue(fx, needs_drop);
 640         };
 641         panic_if_uninhabited, <T> () {
 642             if fx.layout_of(T).abi.is_uninhabited() {
 643                 crate::trap::trap_panic(fx, "[panic] Called intrinsic::panic_if_uninhabited for uninhabited type.");
 644                 return;
 645             }
 646         };
 647
 648         volatile_load, (c ptr) {
 649             // Cranelift treats loads as volatile by default
 650             let inner_layout =
 651                 fx.layout_of(ptr.layout().ty.builtin_deref(true).unwrap().ty);
 652             let val = CValue::by_ref(ptr.load_scalar(fx), inner_layout);
 653             ret.write_cvalue(fx, val);
 654         };
 655         volatile_store, (v ptr, c val) {
 656             // Cranelift treats stores as volatile by default
 657             let dest = CPlace::for_addr(ptr, val.layout());
 658             dest.write_cvalue(fx, val);
 659         };
 660
 661         _ if intrinsic.starts_with("atomic_fence"), () {};
 662         _ if intrinsic.starts_with("atomic_singlethreadfence"), () {};
 663         _ if intrinsic.starts_with("atomic_load"), (c ptr) {
 664             let inner_layout =
 665                 fx.layout_of(ptr.layout().ty.builtin_deref(true).unwrap().ty);
 666             let val = CValue::by_ref(ptr.load_scalar(fx), inner_layout);
 667             ret.write_cvalue(fx, val);
 668         };
 669         _ if intrinsic.starts_with("atomic_store"), (v ptr, c val) {
 670             let dest = CPlace::for_addr(ptr, val.layout());
 671             dest.write_cvalue(fx, val);
 672         };
 673         _ if intrinsic.starts_with("atomic_xchg"), <T> (v ptr, c src) {
 674             // Read old
 675             let clif_ty = fx.clif_type(T).unwrap();
 676             let old = fx.bcx.ins().load(clif_ty, MemFlags::new(), ptr, 0);
 677             ret.write_cvalue(fx, CValue::by_val(old, fx.layout_of(T)));
 678
 679             // Write new
 680             let dest = CPlace::for_addr(ptr, src.layout());
 681             dest.write_cvalue(fx, src);
 682         };
 683         _ if intrinsic.starts_with("atomic_cxchg"), <T> (v ptr, v test_old, v new) { // both atomic_cxchg_* and atomic_cxchgweak_*
 684             // Read old
 685             let clif_ty = fx.clif_type(T).unwrap();
 686             let old = fx.bcx.ins().load(clif_ty, MemFlags::new(), ptr, 0);
 687
 688             // Compare
 689             let is_eq = fx.bcx.ins().icmp(IntCC::Equal, old, test_old);
 690             let new = crate::common::codegen_select(&mut fx.bcx, is_eq, new, old); // Keep old if not equal to test_old
 691
 692             // Write new
 693             fx.bcx.ins().store(MemFlags::new(), new, ptr, 0);
 694
 695             let ret_val = CValue::by_val_pair(old, fx.bcx.ins().bint(types::I8, is_eq), ret.layout());
 696             ret.write_cvalue(fx, ret_val);
 697         };
 698
 699         _ if intrinsic.starts_with("atomic_xadd"), <T> (v ptr, v amount) {
 700             atomic_binop_return_old! (fx, iadd<T>(ptr, amount) -> ret);
 701         };
 702         _ if intrinsic.starts_with("atomic_xsub"), <T> (v ptr, v amount) {
 703             atomic_binop_return_old! (fx, isub<T>(ptr, amount) -> ret);
 704         };
 705         _ if intrinsic.starts_with("atomic_and"), <T> (v ptr, v src) {
 706             atomic_binop_return_old! (fx, band<T>(ptr, src) -> ret);
 707         };
 708         _ if intrinsic.starts_with("atomic_nand"), <T> (v ptr, v src) {
 709             atomic_binop_return_old! (fx, band_not<T>(ptr, src) -> ret);
 710         };
 711         _ if intrinsic.starts_with("atomic_or"), <T> (v ptr, v src) {
 712             atomic_binop_return_old! (fx, bor<T>(ptr, src) -> ret);
 713         };
 714         _ if intrinsic.starts_with("atomic_xor"), <T> (v ptr, v src) {
 715             atomic_binop_return_old! (fx, bxor<T>(ptr, src) -> ret);
 716         };
 717
 718         _ if intrinsic.starts_with("atomic_max"), <T> (v ptr, v src) {
 719             atomic_minmax!(fx, IntCC::SignedGreaterThan, <T> (ptr, src) -> ret);
 720         };
 721         _ if intrinsic.starts_with("atomic_umax"), <T> (v ptr, v src) {
 722             atomic_minmax!(fx, IntCC::UnsignedGreaterThan, <T> (ptr, src) -> ret);
 723         };
 724         _ if intrinsic.starts_with("atomic_min"), <T> (v ptr, v src) {
 725             atomic_minmax!(fx, IntCC::SignedLessThan, <T> (ptr, src) -> ret);
 726         };
 727         _ if intrinsic.starts_with("atomic_umin"), <T> (v ptr, v src) {
 728             atomic_minmax!(fx, IntCC::UnsignedLessThan, <T> (ptr, src) -> ret);
 729         };
 730
 731         minnumf32, (v a, v b) {
 732             let val = fx.bcx.ins().fmin(a, b);
 733             let val = CValue::by_val(val, fx.layout_of(fx.tcx.types.f32));
 734             ret.write_cvalue(fx, val);
 735         };
 736         minnumf64, (v a, v b) {
 737             let val = fx.bcx.ins().fmin(a, b);
 738             let val = CValue::by_val(val, fx.layout_of(fx.tcx.types.f64));
 739             ret.write_cvalue(fx, val);
 740         };
 741         maxnumf32, (v a, v b) {
 742             let val = fx.bcx.ins().fmax(a, b);
 743             let val = CValue::by_val(val, fx.layout_of(fx.tcx.types.f32));
 744             ret.write_cvalue(fx, val);
 745         };
 746         maxnumf64, (v a, v b) {
 747             let val = fx.bcx.ins().fmax(a, b);
 748             let val = CValue::by_val(val, fx.layout_of(fx.tcx.types.f64));
 749             ret.write_cvalue(fx, val);
 750         };
 751
 752         simd_cast, (c x) {
 753             ret.write_cvalue(fx, x.unchecked_cast_to(ret.layout()));
 754         };
 755
 756         simd_add, (c x, c y) {
 757             simd_binop!(fx, intrinsic, iadd(x, y) -> ret);
 758         };
 759         simd_sub, (c x, c y) {
 760             simd_binop!(fx, intrinsic, isub(x, y) -> ret);
 761         };
 762         simd_mul, (c x, c y) {
 763             simd_binop!(fx, intrinsic, imul(x, y) -> ret);
 764         };
 765         simd_div, (c x, c y) {
 766             simd_binop!(fx, intrinsic, udiv|sdiv(x, y) -> ret);
 767         };
 768         simd_rem, (c x, c y) {
 769             simd_binop!(fx, intrinsic, urem|srem(x, y) -> ret);
 770         };
 771         simd_shl, (c x, c y) {
 772             simd_binop!(fx, intrinsic, ishl(x, y) -> ret);
 773         };
 774         simd_shr, (c x, c y) {
 775             simd_binop!(fx, intrinsic, ushr|sshr(x, y) -> ret);
 776         };
 777         simd_and, (c x, c y) {
 778             simd_binop!(fx, intrinsic, band(x, y) -> ret);
 779         };
 780         simd_or, (c x, c y) {
 781             simd_binop!(fx, intrinsic, bor(x, y) -> ret);
 782         };
 783         simd_bxor, (c x, c y) {
 784             simd_binop!(fx, intrinsic, bxor(x, y) -> ret);
 785         };
 786
 787         simd_fmin, (c x, c y) {
 788             simd_binop!(fx, intrinsic, fmin(x, y) -> ret);
 789         };
 790         simd_fmax, (c x, c y) {
 791             simd_binop!(fx, intrinsic, fmax(x, y) -> ret);
 792         };
 793     }
 794
 795     if let Some((_, dest)) = destination {
 796         let ret_ebb = fx.get_ebb(dest);
 797         fx.bcx.ins().jump(ret_ebb, &[]);
 798     } else {
 799         trap_unreachable(fx, "[corruption] Diverging intrinsic returned.");
 800     }
 801 }