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| author | Matthew <mjjasper1@gmail.com> | 2017-04-24 10:20:05 +0100 |
|---|---|---|
| committer | Matthew <mjjasper1@gmail.com> | 2017-04-24 10:20:05 +0100 |
| commit | 158b085f06a41004ebf36d87afa3548f8b60861a (patch) | |
| tree | e035c4787385e562748f7a3d04bb4e5018f82767 /src/libcore/tests | |
| parent | 8a3ea01bcae85a3ed0c90ca5603cd88c469172c3 (diff) | |
| parent | 15ce54096a589de277771ad1f55a334fe2661a64 (diff) | |
| download | rust-158b085f06a41004ebf36d87afa3548f8b60861a.tar.gz rust-158b085f06a41004ebf36d87afa3548f8b60861a.zip | |
Fix more merge conflicts
Diffstat (limited to 'src/libcore/tests')
| -rw-r--r-- | src/libcore/tests/num/dec2flt/rawfp.rs | 47 |
1 files changed, 35 insertions, 12 deletions
diff --git a/src/libcore/tests/num/dec2flt/rawfp.rs b/src/libcore/tests/num/dec2flt/rawfp.rs index 1a3533317da..2b0afc40202 100644 --- a/src/libcore/tests/num/dec2flt/rawfp.rs +++ b/src/libcore/tests/num/dec2flt/rawfp.rs @@ -8,23 +8,14 @@ // option. This file may not be copied, modified, or distributed // except according to those terms. +use std::f32; use std::f64; -use std::mem; use core::num::diy_float::Fp; use core::num::dec2flt::rawfp::{fp_to_float, prev_float, next_float, round_normal}; +use core::num::dec2flt::rawfp::RawFloat; fn integer_decode(f: f64) -> (u64, i16, i8) { - let bits: u64 = unsafe { mem::transmute(f) }; - let sign: i8 = if bits >> 63 == 0 { 1 } else { -1 }; - let mut exponent: i16 = ((bits >> 52) & 0x7ff) as i16; - let mantissa = if exponent == 0 { - (bits & 0xfffffffffffff) << 1 - } else { - (bits & 0xfffffffffffff) | 0x10000000000000 - }; - // Exponent bias + mantissa shift - exponent -= 1023 + 52; - (mantissa, exponent, sign) + RawFloat::integer_decode(f) } #[test] @@ -152,3 +143,35 @@ fn next_float_monotonic() { } assert!(x > 0.5); } + +#[test] +fn test_f32_integer_decode() { + assert_eq!(3.14159265359f32.integer_decode(), (13176795, -22, 1)); + assert_eq!((-8573.5918555f32).integer_decode(), (8779358, -10, -1)); + assert_eq!(2f32.powf(100.0).integer_decode(), (8388608, 77, 1)); + assert_eq!(0f32.integer_decode(), (0, -150, 1)); + assert_eq!((-0f32).integer_decode(), (0, -150, -1)); + assert_eq!(f32::INFINITY.integer_decode(), (8388608, 105, 1)); + assert_eq!(f32::NEG_INFINITY.integer_decode(), (8388608, 105, -1)); + + // Ignore the "sign" (quiet / signalling flag) of NAN. + // It can vary between runtime operations and LLVM folding. + let (nan_m, nan_e, _nan_s) = f32::NAN.integer_decode(); + assert_eq!((nan_m, nan_e), (12582912, 105)); +} + +#[test] +fn test_f64_integer_decode() { + assert_eq!(3.14159265359f64.integer_decode(), (7074237752028906, -51, 1)); + assert_eq!((-8573.5918555f64).integer_decode(), (4713381968463931, -39, -1)); + assert_eq!(2f64.powf(100.0).integer_decode(), (4503599627370496, 48, 1)); + assert_eq!(0f64.integer_decode(), (0, -1075, 1)); + assert_eq!((-0f64).integer_decode(), (0, -1075, -1)); + assert_eq!(f64::INFINITY.integer_decode(), (4503599627370496, 972, 1)); + assert_eq!(f64::NEG_INFINITY.integer_decode(), (4503599627370496, 972, -1)); + + // Ignore the "sign" (quiet / signalling flag) of NAN. + // It can vary between runtime operations and LLVM folding. + let (nan_m, nan_e, _nan_s) = f64::NAN.integer_decode(); + assert_eq!((nan_m, nan_e), (6755399441055744, 972)); +} |
