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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 02:49:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 02:49:50 +0000 |
commit | 9835e2ae736235810b4ea1c162ca5e65c547e770 (patch) | |
tree | 3fcebf40ed70e581d776a8a4c65923e8ec20e026 /vendor/libm-0.1.4/src/math/floor.rs | |
parent | Releasing progress-linux version 1.70.0+dfsg2-1~progress7.99u1. (diff) | |
download | rustc-9835e2ae736235810b4ea1c162ca5e65c547e770.tar.xz rustc-9835e2ae736235810b4ea1c162ca5e65c547e770.zip |
Merging upstream version 1.71.1+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/libm-0.1.4/src/math/floor.rs')
-rw-r--r-- | vendor/libm-0.1.4/src/math/floor.rs | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/libm-0.1.4/src/math/floor.rs b/vendor/libm-0.1.4/src/math/floor.rs new file mode 100644 index 000000000..f6068c697 --- /dev/null +++ b/vendor/libm-0.1.4/src/math/floor.rs @@ -0,0 +1,41 @@ +use core::f64; + +const TOINT: f64 = 1. / f64::EPSILON; + +/// Floor (f64) +/// +/// Finds the nearest integer less than or equal to `x`. +#[inline] +#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] +pub fn floor(x: f64) -> f64 { + // On wasm32 we know that LLVM's intrinsic will compile to an optimized + // `f64.floor` native instruction, so we can leverage this for both code size + // and speed. + llvm_intrinsically_optimized! { + #[cfg(target_arch = "wasm32")] { + return unsafe { ::core::intrinsics::floorf64(x) } + } + } + let ui = x.to_bits(); + let e = ((ui >> 52) & 0x7ff) as i32; + + if (e >= 0x3ff + 52) || (x == 0.) { + return x; + } + /* y = int(x) - x, where int(x) is an integer neighbor of x */ + let y = if (ui >> 63) != 0 { + x - TOINT + TOINT - x + } else { + x + TOINT - TOINT - x + }; + /* special case because of non-nearest rounding modes */ + if e < 0x3ff { + force_eval!(y); + return if (ui >> 63) != 0 { -1. } else { 0. }; + } + if y > 0. { + x + y - 1. + } else { + x + y + } +} |