Sync from rust 385fa9d845

src/base.rs

@@ -649,8 +649,8 @@ fn codegen_stmt<'tcx>(
                     | CastKind::IntToFloat
                     | CastKind::FnPtrToPtr
                     | CastKind::PtrToPtr
-                    | CastKind::PointerExposeAddress
-                    | CastKind::PointerFromExposedAddress,
+                    | CastKind::PointerExposeProvenance
+                    | CastKind::PointerWithExposedProvenance,
                     ref operand,
                     to_ty,
                 ) => {

src/codegen_i128.rs

@@ -68,7 +68,7 @@ pub(crate) fn maybe_codegen<'tcx>(
                 Some(CValue::by_val(ret_val, lhs.layout()))
             }
         }
-        BinOp::Lt | BinOp::Le | BinOp::Eq | BinOp::Ge | BinOp::Gt | BinOp::Ne => None,
+        BinOp::Lt | BinOp::Le | BinOp::Eq | BinOp::Ge | BinOp::Gt | BinOp::Ne | BinOp::Cmp => None,
         BinOp::Shl | BinOp::ShlUnchecked | BinOp::Shr | BinOp::ShrUnchecked => None,
     }
 }
@@ -134,6 +134,7 @@ pub(crate) fn maybe_codegen_checked<'tcx>(
         BinOp::AddUnchecked | BinOp::SubUnchecked | BinOp::MulUnchecked => unreachable!(),
         BinOp::Offset => unreachable!("offset should only be used on pointers, not 128bit ints"),
         BinOp::Div | BinOp::Rem => unreachable!(),
+        BinOp::Cmp => unreachable!(),
         BinOp::Lt | BinOp::Le | BinOp::Eq | BinOp::Ge | BinOp::Gt | BinOp::Ne => unreachable!(),
         BinOp::Shl | BinOp::ShlUnchecked | BinOp::Shr | BinOp::ShrUnchecked => unreachable!(),
     }

src/intrinsics/llvm_x86.rs

@@ -1393,7 +1393,7 @@ fn llvm_add_sub<'tcx>(
 
     // c + carry -> c + first intermediate carry or borrow respectively
     let int0 = crate::num::codegen_checked_int_binop(fx, bin_op, a, b);
-    let c = int0.value_field(fx, FieldIdx::new(0));
+    let c = int0.value_field(fx, FieldIdx::ZERO);
     let cb0 = int0.value_field(fx, FieldIdx::new(1)).load_scalar(fx);
 
     // c + carry -> c + second intermediate carry or borrow respectively

src/intrinsics/simd.rs

@@ -965,7 +965,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
             });
         }
 
-        sym::simd_expose_addr | sym::simd_from_exposed_addr | sym::simd_cast_ptr => {
+        sym::simd_expose_provenance | sym::simd_with_exposed_provenance | sym::simd_cast_ptr => {
             intrinsic_args!(fx, args => (arg); intrinsic);
             ret.write_cvalue_transmute(fx, arg);
         }

src/num.rs

@@ -40,6 +40,22 @@ pub(crate) fn bin_op_to_intcc(bin_op: BinOp, signed: bool) -> Option<IntCC> {
     })
 }
 
+fn codegen_three_way_compare<'tcx>(
+    fx: &mut FunctionCx<'_, '_, 'tcx>,
+    signed: bool,
+    lhs: Value,
+    rhs: Value,
+) -> CValue<'tcx> {
+    // This emits `(lhs > rhs) - (lhs < rhs)`, which is cranelift's preferred form per
+    // <https://github.com/bytecodealliance/wasmtime/blob/8052bb9e3b792503b225f2a5b2ba3bc023bff462/cranelift/codegen/src/prelude_opt.isle#L41-L47>
+    let gt_cc = crate::num::bin_op_to_intcc(BinOp::Gt, signed).unwrap();
+    let lt_cc = crate::num::bin_op_to_intcc(BinOp::Lt, signed).unwrap();
+    let gt = fx.bcx.ins().icmp(gt_cc, lhs, rhs);
+    let lt = fx.bcx.ins().icmp(lt_cc, lhs, rhs);
+    let val = fx.bcx.ins().isub(gt, lt);
+    CValue::by_val(val, fx.layout_of(fx.tcx.ty_ordering_enum(Some(fx.mir.span))))
+}
+
 fn codegen_compare_bin_op<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
     bin_op: BinOp,
@@ -47,6 +63,10 @@ fn codegen_compare_bin_op<'tcx>(
     lhs: Value,
     rhs: Value,
 ) -> CValue<'tcx> {
+    if bin_op == BinOp::Cmp {
+        return codegen_three_way_compare(fx, signed, lhs, rhs);
+    }
+
     let intcc = crate::num::bin_op_to_intcc(bin_op, signed).unwrap();
     let val = fx.bcx.ins().icmp(intcc, lhs, rhs);
     CValue::by_val(val, fx.layout_of(fx.tcx.types.bool))
@@ -59,7 +79,7 @@ pub(crate) fn codegen_binop<'tcx>(
     in_rhs: CValue<'tcx>,
 ) -> CValue<'tcx> {
     match bin_op {
-        BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt => {
+        BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt | BinOp::Cmp => {
             match in_lhs.layout().ty.kind() {
                 ty::Bool | ty::Uint(_) | ty::Int(_) | ty::Char => {
                     let signed = type_sign(in_lhs.layout().ty);
@@ -160,7 +180,7 @@ pub(crate) fn codegen_int_binop<'tcx>(
         }
         BinOp::Offset => unreachable!("Offset is not an integer operation"),
         // Compare binops handles by `codegen_binop`.
-        BinOp::Eq | BinOp::Ne | BinOp::Lt | BinOp::Le | BinOp::Gt | BinOp::Ge => {
+        BinOp::Eq | BinOp::Ne | BinOp::Lt | BinOp::Le | BinOp::Gt | BinOp::Ge | BinOp::Cmp => {
             unreachable!("{:?}({:?}, {:?})", bin_op, in_lhs.layout().ty, in_rhs.layout().ty);
         }
     };

src/vtable.rs

@@ -61,7 +61,7 @@ pub(crate) fn get_ptr_and_method_ref<'tcx>(
             if ty.is_dyn_star() {
                 let inner_layout = fx.layout_of(arg.layout().ty.builtin_deref(true).unwrap().ty);
                 let dyn_star = CPlace::for_ptr(Pointer::new(arg.load_scalar(fx)), inner_layout);
-                let ptr = dyn_star.place_field(fx, FieldIdx::new(0)).to_ptr();
+                let ptr = dyn_star.place_field(fx, FieldIdx::ZERO).to_ptr();
                 let vtable =
                     dyn_star.place_field(fx, FieldIdx::new(1)).to_cvalue(fx).load_scalar(fx);
                 break 'block (ptr, vtable);