diff options
| -rw-r--r-- | library/compiler-builtins/libm/crates/libm-test/src/f8_impl.rs | 1 | ||||
| -rw-r--r-- | library/compiler-builtins/libm/src/math/support/float_traits.rs | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/library/compiler-builtins/libm/crates/libm-test/src/f8_impl.rs b/library/compiler-builtins/libm/crates/libm-test/src/f8_impl.rs index 5dce9be1891..56ea0b72995 100644 --- a/library/compiler-builtins/libm/crates/libm-test/src/f8_impl.rs +++ b/library/compiler-builtins/libm/crates/libm-test/src/f8_impl.rs @@ -32,6 +32,7 @@ impl Float for f8 { const INFINITY: Self = Self(0b0_1111_000); const NEG_INFINITY: Self = Self(0b1_1111_000); const NAN: Self = Self(0b0_1111_100); + const MIN_POSITIVE_NORMAL: Self = Self(1 << Self::SIG_BITS); // FIXME: incorrect values const EPSILON: Self = Self::ZERO; const PI: Self = Self::ZERO; diff --git a/library/compiler-builtins/libm/src/math/support/float_traits.rs b/library/compiler-builtins/libm/src/math/support/float_traits.rs index ee83c793da3..42ce3148464 100644 --- a/library/compiler-builtins/libm/src/math/support/float_traits.rs +++ b/library/compiler-builtins/libm/src/math/support/float_traits.rs @@ -41,6 +41,8 @@ pub trait Float: const NEG_PI: Self; const FRAC_PI_2: Self; + const MIN_POSITIVE_NORMAL: Self; + /// The bitwidth of the float type const BITS: u32; @@ -200,6 +202,9 @@ macro_rules! float_impl { const MIN: Self = $from_bits(Self::Int::MAX & !(1 << Self::SIG_BITS)); const EPSILON: Self = <$ty>::EPSILON; + // Exponent is a 1 in the LSB + const MIN_POSITIVE_NORMAL: Self = $from_bits(1 << Self::SIG_BITS); + const PI: Self = core::$ty::consts::PI; const NEG_PI: Self = -Self::PI; const FRAC_PI_2: Self = core::$ty::consts::FRAC_PI_2; @@ -358,6 +363,7 @@ mod tests { // results for zero and subnormals. assert_eq!(f16::ZERO.exp_unbiased(), -15); assert_eq!(f16::from_bits(0x1).exp_unbiased(), -15); + assert_eq!(f16::MIN_POSITIVE, f16::MIN_POSITIVE_NORMAL); // `from_parts` assert_biteq!(f16::from_parts(true, f16::EXP_BIAS, 0), -1.0f16); @@ -383,6 +389,7 @@ mod tests { // results for zero and subnormals. assert_eq!(f32::ZERO.exp_unbiased(), -127); assert_eq!(f32::from_bits(0x1).exp_unbiased(), -127); + assert_eq!(f32::MIN_POSITIVE, f32::MIN_POSITIVE_NORMAL); // `from_parts` assert_biteq!(f32::from_parts(true, f32::EXP_BIAS, 0), -1.0f32); @@ -409,6 +416,7 @@ mod tests { // results for zero and subnormals. assert_eq!(f64::ZERO.exp_unbiased(), -1023); assert_eq!(f64::from_bits(0x1).exp_unbiased(), -1023); + assert_eq!(f64::MIN_POSITIVE, f64::MIN_POSITIVE_NORMAL); // `from_parts` assert_biteq!(f64::from_parts(true, f64::EXP_BIAS, 0), -1.0f64); @@ -436,6 +444,7 @@ mod tests { // results for zero and subnormals. assert_eq!(f128::ZERO.exp_unbiased(), -16383); assert_eq!(f128::from_bits(0x1).exp_unbiased(), -16383); + assert_eq!(f128::MIN_POSITIVE, f128::MIN_POSITIVE_NORMAL); // `from_parts` assert_biteq!(f128::from_parts(true, f128::EXP_BIAS, 0), -1.0f128); |