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Make Float::classify matching more clear for f64 and f32

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This commit is contained in:
Brendan Zabarauskas 2013-05-13 07:57:27 +10:00
parent 36771ef609
commit 4f8084a363
2 changed files with 14 additions and 20 deletions
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17
src/libcore/num/f32.rs
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@ -578,10 +578,7 @@ impl Float for f32 {
/// Returns `true` if the number is neither zero, infinite, subnormal or NaN
#[inline(always)]
fn is_normal(&self) -> bool {
match self.classify() {
FPNormal => true,
_ => false,
}
self.classify() == FPNormal
}
/// Returns the floating point category of the number. If only one property is going to
@ -591,14 +588,14 @@ impl Float for f32 {
static MAN_MASK: u32 = 0x007fffff;
match (
unsafe { ::cast::transmute::<f32,u32>(*self) } & MAN_MASK,
unsafe { ::cast::transmute::<f32,u32>(*self) } & EXP_MASK,
unsafe { ::cast::transmute::<f32,u32>(*self) } & MAN_MASK
) {
(EXP_MASK, 0) => FPInfinite,
(EXP_MASK, _) => FPNaN,
(exp, _) if exp != 0 => FPNormal,
_ if self.is_zero() => FPZero,
_ => FPSubnormal,
(0, 0) => FPZero,
(_, 0) => FPSubnormal,
(0, EXP_MASK) => FPInfinite,
(_, EXP_MASK) => FPNaN,
_ => FPNormal,
}
}

17
src/libcore/num/f64.rs
View file

@ -621,10 +621,7 @@ impl Float for f64 {
/// Returns `true` if the number is neither zero, infinite, subnormal or NaN
#[inline(always)]
fn is_normal(&self) -> bool {
match self.classify() {
FPNormal => true,
_ => false,
}
self.classify() == FPNormal
}
/// Returns the floating point category of the number. If only one property is going to
@ -634,14 +631,14 @@ impl Float for f64 {
static MAN_MASK: u64 = 0x000fffffffffffff;
match (
unsafe { ::cast::transmute::<f64,u64>(*self) } & MAN_MASK,
unsafe { ::cast::transmute::<f64,u64>(*self) } & EXP_MASK,
unsafe { ::cast::transmute::<f64,u64>(*self) } & MAN_MASK
) {
(EXP_MASK, 0) => FPInfinite,
(EXP_MASK, _) => FPNaN,
(exp, _) if exp != 0 => FPNormal,
_ if self.is_zero() => FPZero,
_ => FPSubnormal,
(0, 0) => FPZero,
(_, 0) => FPSubnormal,
(0, EXP_MASK) => FPInfinite,
(_, EXP_MASK) => FPNaN,
_ => FPNormal,
}
}