1 //! Replaces 128-bit operators with lang item calls where necessary
3 use cranelift_codegen::ir::ArgumentPurpose;
7 pub(crate) fn maybe_codegen<'tcx>(
8 fx: &mut FunctionCx<'_, '_, 'tcx>,
13 ) -> Option<CValue<'tcx>> {
14 if lhs.layout().ty != fx.tcx.types.u128
15 && lhs.layout().ty != fx.tcx.types.i128
16 && rhs.layout().ty != fx.tcx.types.u128
17 && rhs.layout().ty != fx.tcx.types.i128
22 let lhs_val = lhs.load_scalar(fx);
23 let rhs_val = rhs.load_scalar(fx);
25 let is_signed = type_sign(lhs.layout().ty);
28 BinOp::BitAnd | BinOp::BitOr | BinOp::BitXor => {
32 BinOp::Add | BinOp::Sub if !checked => None,
33 BinOp::Mul if !checked => {
34 let val_ty = if is_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
35 Some(fx.easy_call("__multi3", &[lhs, rhs], val_ty))
37 BinOp::Add | BinOp::Sub | BinOp::Mul => {
39 let out_ty = fx.tcx.mk_tup([lhs.layout().ty, fx.tcx.types.bool].iter());
40 let out_place = CPlace::new_stack_slot(fx, fx.layout_of(out_ty));
41 let param_types = vec![
42 AbiParam::special(pointer_ty(fx.tcx), ArgumentPurpose::StructReturn),
43 AbiParam::new(types::I128),
44 AbiParam::new(types::I128),
46 let args = [out_place.to_ptr().get_addr(fx), lhs.load_scalar(fx), rhs.load_scalar(fx)];
47 let name = match (bin_op, is_signed) {
48 (BinOp::Add, false) => "__rust_u128_addo",
49 (BinOp::Add, true) => "__rust_i128_addo",
50 (BinOp::Sub, false) => "__rust_u128_subo",
51 (BinOp::Sub, true) => "__rust_i128_subo",
52 (BinOp::Mul, false) => "__rust_u128_mulo",
53 (BinOp::Mul, true) => "__rust_i128_mulo",
56 fx.lib_call(name, param_types, vec![], &args);
57 Some(out_place.to_cvalue(fx))
59 BinOp::Offset => unreachable!("offset should only be used on pointers, not 128bit ints"),
63 Some(fx.easy_call("__divti3", &[lhs, rhs], fx.tcx.types.i128))
65 Some(fx.easy_call("__udivti3", &[lhs, rhs], fx.tcx.types.u128))
71 Some(fx.easy_call("__modti3", &[lhs, rhs], fx.tcx.types.i128))
73 Some(fx.easy_call("__umodti3", &[lhs, rhs], fx.tcx.types.u128))
76 BinOp::Lt | BinOp::Le | BinOp::Eq | BinOp::Ge | BinOp::Gt | BinOp::Ne => {
80 BinOp::Shl | BinOp::Shr => {
81 let is_overflow = if checked {
84 // FIXME support non 128bit rhs
85 /*let (rhs_lsb, rhs_msb) = fx.bcx.ins().isplit(rhs_val);
86 let rhs_msb_gt_0 = fx.bcx.ins().icmp_imm(IntCC::NotEqual, rhs_msb, 0);
87 let rhs_lsb_ge_128 = fx.bcx.ins().icmp_imm(IntCC::SignedGreaterThan, rhs_lsb, 127);
88 let is_overflow = fx.bcx.ins().bor(rhs_msb_gt_0, rhs_lsb_ge_128);*/
89 let is_overflow = fx.bcx.ins().bconst(types::B1, false);
91 Some(fx.bcx.ins().bint(types::I8, is_overflow))
96 let truncated_rhs = clif_intcast(fx, rhs_val, types::I32, false);
97 let val = match bin_op {
98 BinOp::Shl => fx.bcx.ins().ishl(lhs_val, truncated_rhs),
101 fx.bcx.ins().sshr(lhs_val, truncated_rhs)
103 fx.bcx.ins().ushr(lhs_val, truncated_rhs)
108 if let Some(is_overflow) = is_overflow {
109 let out_ty = fx.tcx.mk_tup([lhs.layout().ty, fx.tcx.types.bool].iter());
110 Some(CValue::by_val_pair(val, is_overflow, fx.layout_of(out_ty)))
112 Some(CValue::by_val(val, lhs.layout()))