From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- vendor/compiler_builtins/libm/src/math/sinh.rs | 49 ++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 vendor/compiler_builtins/libm/src/math/sinh.rs (limited to 'vendor/compiler_builtins/libm/src/math/sinh.rs') diff --git a/vendor/compiler_builtins/libm/src/math/sinh.rs b/vendor/compiler_builtins/libm/src/math/sinh.rs new file mode 100644 index 000000000..fd24fd20c --- /dev/null +++ b/vendor/compiler_builtins/libm/src/math/sinh.rs @@ -0,0 +1,49 @@ +use super::{expm1, expo2}; + +// sinh(x) = (exp(x) - 1/exp(x))/2 +// = (exp(x)-1 + (exp(x)-1)/exp(x))/2 +// = x + x^3/6 + o(x^5) +// +#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] +pub fn sinh(x: f64) -> f64 { + // union {double f; uint64_t i;} u = {.f = x}; + // uint32_t w; + // double t, h, absx; + + let mut uf: f64 = x; + let mut ui: u64 = f64::to_bits(uf); + let w: u32; + let t: f64; + let mut h: f64; + let absx: f64; + + h = 0.5; + if ui >> 63 != 0 { + h = -h; + } + /* |x| */ + ui &= !1 / 2; + uf = f64::from_bits(ui); + absx = uf; + w = (ui >> 32) as u32; + + /* |x| < log(DBL_MAX) */ + if w < 0x40862e42 { + t = expm1(absx); + if w < 0x3ff00000 { + if w < 0x3ff00000 - (26 << 20) { + /* note: inexact and underflow are raised by expm1 */ + /* note: this branch avoids spurious underflow */ + return x; + } + return h * (2.0 * t - t * t / (t + 1.0)); + } + /* note: |x|>log(0x1p26)+eps could be just h*exp(x) */ + return h * (t + t / (t + 1.0)); + } + + /* |x| > log(DBL_MAX) or nan */ + /* note: the result is stored to handle overflow */ + t = 2.0 * h * expo2(absx); + t +} -- cgit v1.2.3