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Implement float -> float and int -> float casts

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This commit is contained in:
bjorn3 2018-08-09 11:16:46 +02:00
parent 6c86274943
commit 9a2b1d4ac3
2 changed files with 33 additions and 0 deletions
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8
examples/example.rs
View File

@ -158,3 +158,11 @@ unsafe fn use_ctlz_nonzero(a: u16) -> u16 {
fn ptr_as_usize(ptr: *const u8) -> usize {
ptr as usize
}
fn float_cast(a: f32, b: f64) -> (f64, f32) {
(a as f64, b as f32)
}
fn int_to_float(a: u8, b: i32) -> (f64, f32) {
(a as f64, b as f32)
}

25
src/base.rs
View File

@ -395,6 +395,31 @@ fn trans_stmt<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, cur_ebb: Ebb, stmt: &
let res = crate::common::cton_intcast(fx, from, from_ty, to_ty, true);
lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
}
(TypeVariants::TyFloat(from_flt), TypeVariants::TyFloat(to_flt)) => {
let from = operand.load_value(fx);
let res = match (from_flt, to_flt) {
(FloatTy::F32, FloatTy::F64) => {
fx.bcx.ins().fpromote(types::F64, from)
}
(FloatTy::F64, FloatTy::F32) => {
fx.bcx.ins().fdemote(types::F32, from)
}
_ => from,
};
lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
}
(TypeVariants::TyInt(_), TypeVariants::TyFloat(_)) => {
let from = operand.load_value(fx);
let f_type = fx.cton_type(to_ty).unwrap();
let res = fx.bcx.ins().fcvt_from_sint(f_type, from);
lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
}
(TypeVariants::TyUint(_), TypeVariants::TyFloat(_)) => {
let from = operand.load_value(fx);
let f_type = fx.cton_type(to_ty).unwrap();
let res = fx.bcx.ins().fcvt_from_uint(f_type, from);
lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
}
_ => unimpl!("rval misc {:?} {:?}", from_ty, to_ty),
}
}