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Implement 128bit multiply with overflow

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This commit is contained in:
bjorn3
2019-07-20 17:57:00 +02:00
parent 88ad25f45e
commit 65e337cdf3
3 changed files with 34 additions and 56 deletions
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49
src/codegen_i128.rs
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@@ -30,19 +30,9 @@ pub fn maybe_codegen<'a, 'tcx>(
BinOp::Mul => {
let res = if checked {
if is_signed {
let oflow_place = CPlace::new_stack_slot(fx, fx.tcx.types.i32);
let oflow_addr = oflow_place.to_addr(fx);
let oflow_addr = CValue::by_val(oflow_addr, fx.layout_of(fx.tcx.mk_mut_ptr(fx.tcx.types.i32)));
let val = fx.easy_call("__muloti4", &[lhs, rhs, oflow_addr], fx.tcx.types.i128);
let val = val.load_scalar(fx);
let oflow = oflow_place.to_cvalue(fx).load_scalar(fx);
let oflow = fx.bcx.ins().icmp_imm(IntCC::NotEqual, oflow, 0);
let oflow = fx.bcx.ins().bint(types::I8, oflow);
CValue::by_val_pair(val, oflow, fx.layout_of(out_ty))
fx.easy_call("__rust_i128_mulo", &[lhs, rhs], out_ty)
} else {
// FIXME implement it
let out_layout = fx.layout_of(out_ty);
return Some(crate::trap::trap_unreachable_ret_value(fx, out_layout, format!("unimplemented 128bit checked binop unsigned mul")));
fx.easy_call("__rust_u128_mulo", &[lhs, rhs], out_ty)
}
} else {
let val_ty = if is_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
@@ -51,32 +41,20 @@ pub fn maybe_codegen<'a, 'tcx>(
return Some(res);
}
BinOp::Div => {
let res = if checked {
// FIXME implement it
let out_layout = fx.layout_of(out_ty);
return Some(crate::trap::trap_unreachable_ret_value(fx, out_layout, format!("unimplemented 128bit checked binop div")));
assert!(!checked);
if is_signed {
Some(fx.easy_call("__divti3", &[lhs, rhs], fx.tcx.types.i128))
} else {
if is_signed {
fx.easy_call("__divti3", &[lhs, rhs], fx.tcx.types.i128)
} else {
fx.easy_call("__udivti3", &[lhs, rhs], fx.tcx.types.u128)
}
};
return Some(res);
Some(fx.easy_call("__udivti3", &[lhs, rhs], fx.tcx.types.u128))
}
}
BinOp::Rem => {
let res = if checked {
// FIXME implement it
let out_layout = fx.layout_of(out_ty);
return Some(crate::trap::trap_unreachable_ret_value(fx, out_layout, format!("unimplemented 128bit checked binop rem")));
assert!(!checked);
if is_signed {
Some(fx.easy_call("__modti3", &[lhs, rhs], fx.tcx.types.i128))
} else {
if is_signed {
fx.easy_call("__modti3", &[lhs, rhs], fx.tcx.types.i128)
} else {
fx.easy_call("__umodti3", &[lhs, rhs], fx.tcx.types.u128)
}
};
return Some(res);
Some(fx.easy_call("__umodti3", &[lhs, rhs], fx.tcx.types.u128))
}
}
BinOp::Lt | BinOp::Le | BinOp::Eq | BinOp::Ge | BinOp::Gt | BinOp::Ne => {
assert!(!checked);
@@ -140,8 +118,9 @@ pub fn maybe_codegen<'a, 'tcx>(
Some(CValue::by_val(val, fx.layout_of(fx.tcx.types.i128)))
}
(BinOp::Shl, _) => {
let val_ty = if is_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
let val = fx.bcx.ins().iconcat(all_zeros, lhs_lsb);
Some(CValue::by_val(val, fx.layout_of(out_ty)))
Some(CValue::by_val(val, fx.layout_of(val_ty)))
}
_ => None
};