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Diffstat (limited to '')
-rw-r--r-- | vendor/compiler_builtins/libm/src/math/frexp.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/libm/src/math/frexp.rs b/vendor/compiler_builtins/libm/src/math/frexp.rs new file mode 100644 index 000000000..badad786a --- /dev/null +++ b/vendor/compiler_builtins/libm/src/math/frexp.rs @@ -0,0 +1,20 @@ +pub fn frexp(x: f64) -> (f64, i32) { + let mut y = x.to_bits(); + let ee = ((y >> 52) & 0x7ff) as i32; + + if ee == 0 { + if x != 0.0 { + let x1p64 = f64::from_bits(0x43f0000000000000); + let (x, e) = frexp(x * x1p64); + return (x, e - 64); + } + return (x, 0); + } else if ee == 0x7ff { + return (x, 0); + } + + let e = ee - 0x3fe; + y &= 0x800fffffffffffff; + y |= 0x3fe0000000000000; + return (f64::from_bits(y), e); +} |