1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
//! Various number casting functions
use crate::prelude::*;
pub(crate) fn clif_intcast(
fx: &mut FunctionCx<'_, '_, '_>,
val: Value,
to: Type,
signed: bool,
) -> Value {
let from = fx.bcx.func.dfg.value_type(val);
match (from, to) {
// equal
(_, _) if from == to => val,
// extend
(_, _) if to.wider_or_equal(from) => {
if signed {
fx.bcx.ins().sextend(to, val)
} else {
fx.bcx.ins().uextend(to, val)
}
}
// reduce
(_, _) => fx.bcx.ins().ireduce(to, val),
}
}
pub(crate) fn clif_int_or_float_cast(
fx: &mut FunctionCx<'_, '_, '_>,
from: Value,
from_signed: bool,
to_ty: Type,
to_signed: bool,
) -> Value {
let from_ty = fx.bcx.func.dfg.value_type(from);
if from_ty.is_int() && to_ty.is_int() {
// int-like -> int-like
clif_intcast(
fx,
from,
to_ty,
// This is correct as either from_signed == to_signed (=> this is trivially correct)
// Or from_clif_ty == to_clif_ty, which means this is a no-op.
from_signed,
)
} else if from_ty.is_int() && to_ty.is_float() {
if from_ty == types::I128 {
// _______ss__f_
// __float tisf: i128 -> f32
// __float tidf: i128 -> f64
// __floatuntisf: u128 -> f32
// __floatuntidf: u128 -> f64
let name = format!(
"__float{sign}ti{flt}f",
sign = if from_signed { "" } else { "un" },
flt = match to_ty {
types::F32 => "s",
types::F64 => "d",
_ => unreachable!("{:?}", to_ty),
},
);
let from_rust_ty = if from_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
let to_rust_ty = match to_ty {
types::F32 => fx.tcx.types.f32,
types::F64 => fx.tcx.types.f64,
_ => unreachable!(),
};
return fx
.easy_call(&name, &[CValue::by_val(from, fx.layout_of(from_rust_ty))], to_rust_ty)
.load_scalar(fx);
}
// int-like -> float
if from_signed {
fx.bcx.ins().fcvt_from_sint(to_ty, from)
} else {
fx.bcx.ins().fcvt_from_uint(to_ty, from)
}
} else if from_ty.is_float() && to_ty.is_int() {
let val = if to_ty == types::I128 {
// _____sssf___
// __fix sfti: f32 -> i128
// __fix dfti: f64 -> i128
// __fixunssfti: f32 -> u128
// __fixunsdfti: f64 -> u128
let name = format!(
"__fix{sign}{flt}fti",
sign = if to_signed { "" } else { "uns" },
flt = match from_ty {
types::F32 => "s",
types::F64 => "d",
_ => unreachable!("{:?}", to_ty),
},
);
let from_rust_ty = match from_ty {
types::F32 => fx.tcx.types.f32,
types::F64 => fx.tcx.types.f64,
_ => unreachable!(),
};
let to_rust_ty = if to_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
fx.easy_call(&name, &[CValue::by_val(from, fx.layout_of(from_rust_ty))], to_rust_ty)
.load_scalar(fx)
} else if to_ty == types::I8 || to_ty == types::I16 {
// FIXME implement fcvt_to_*int_sat.i8/i16
let val = if to_signed {
fx.bcx.ins().fcvt_to_sint_sat(types::I32, from)
} else {
fx.bcx.ins().fcvt_to_uint_sat(types::I32, from)
};
let (min, max) = match (to_ty, to_signed) {
(types::I8, false) => (0, i64::from(u8::MAX)),
(types::I16, false) => (0, i64::from(u16::MAX)),
(types::I8, true) => (i64::from(i8::MIN), i64::from(i8::MAX)),
(types::I16, true) => (i64::from(i16::MIN), i64::from(i16::MAX)),
_ => unreachable!(),
};
let min_val = fx.bcx.ins().iconst(types::I32, min);
let max_val = fx.bcx.ins().iconst(types::I32, max);
let val = if to_signed {
let has_underflow = fx.bcx.ins().icmp_imm(IntCC::SignedLessThan, val, min);
let has_overflow = fx.bcx.ins().icmp_imm(IntCC::SignedGreaterThan, val, max);
let bottom_capped = fx.bcx.ins().select(has_underflow, min_val, val);
fx.bcx.ins().select(has_overflow, max_val, bottom_capped)
} else {
let has_overflow = fx.bcx.ins().icmp_imm(IntCC::UnsignedGreaterThan, val, max);
fx.bcx.ins().select(has_overflow, max_val, val)
};
fx.bcx.ins().ireduce(to_ty, val)
} else if to_signed {
fx.bcx.ins().fcvt_to_sint_sat(to_ty, from)
} else {
fx.bcx.ins().fcvt_to_uint_sat(to_ty, from)
};
if let Some(false) = fx.tcx.sess.opts.unstable_opts.saturating_float_casts {
return val;
}
let is_not_nan = fx.bcx.ins().fcmp(FloatCC::Equal, from, from);
let zero = type_zero_value(&mut fx.bcx, to_ty);
fx.bcx.ins().select(is_not_nan, val, zero)
} else if from_ty.is_float() && to_ty.is_float() {
// float -> float
match (from_ty, to_ty) {
(types::F32, types::F64) => fx.bcx.ins().fpromote(types::F64, from),
(types::F64, types::F32) => fx.bcx.ins().fdemote(types::F32, from),
_ => from,
}
} else {
unreachable!("cast value from {:?} to {:?}", from_ty, to_ty);
}
}
|
