mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-14 14:45:40 +00:00
84 lines
2.1 KiB
Rust
84 lines
2.1 KiB
Rust
use std::{f32, f64};
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// F32
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pub extern "C" fn ceilf32(x: f32) -> f32 {
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x.ceil()
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}
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pub extern "C" fn floorf32(x: f32) -> f32 {
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x.floor()
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}
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pub extern "C" fn truncf32(x: f32) -> f32 {
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x.trunc()
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}
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/// `f32.round()` doesn't have the correct behavior. Ideally, we'd use
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/// "https://doc.rust-lang.org/std/intrinsics/fn.nearbyintf32.html" for this,
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/// but support for stable compilers is necessary, so we must implement
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/// this ourselves.
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/// This is ported from "https://github.com/rust-lang/rust/issues/55107#issuecomment-431247454"
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pub extern "C" fn nearbyintf32(x: f32) -> f32 {
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#[inline]
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fn copysign(x: f32, y: f32) -> f32 {
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let bitmask = y.to_bits() & (1 << 31);
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f32::from_bits(x.to_bits() | bitmask)
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}
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if x.is_nan() {
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f32::from_bits(x.to_bits() | (1 << 22))
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} else {
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let k = f32::EPSILON.recip();
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let a = x.abs();
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if a < k {
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copysign((a + k) - k, x)
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} else {
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x
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}
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}
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}
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// F64
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pub extern "C" fn ceilf64(x: f64) -> f64 {
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x.ceil()
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}
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pub extern "C" fn floorf64(x: f64) -> f64 {
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x.floor()
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}
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pub extern "C" fn truncf64(x: f64) -> f64 {
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x.trunc()
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}
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/// `f64.round()` doesn't have the correct behavior. Ideally, we'd use
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/// "https://doc.rust-lang.org/std/intrinsics/fn.nearbyintf64.html" for this,
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/// but support for stable compilers is necessary, so we must implement
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/// this ourselves.
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/// This is ported from "https://github.com/rust-lang/rust/issues/55007#issuecomment-431247454"
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pub extern "C" fn nearbyintf64(x: f64) -> f64 {
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#[inline]
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fn copysign(x: f64, y: f64) -> f64 {
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let bitmask = y.to_bits() & (1 << 63);
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f64::from_bits(x.to_bits() | bitmask)
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}
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if x.is_nan() {
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f64::from_bits(x.to_bits() | (1 << 51))
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} else {
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let k = f64::EPSILON.recip();
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let a = x.abs();
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if a < k {
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copysign((a + k) - k, x)
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} else {
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x
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}
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}
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}
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/// A declaration for the stack probe function in Rust's standard library, for
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/// catching callstack overflow.
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extern "C" {
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pub fn __rust_probestack();
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}
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