forked from AbleOS/holey-bytes
60 lines
1.8 KiB
Rust
60 lines
1.8 KiB
Rust
use {core::arch::asm, hbbytecode::RoundingMode};
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macro_rules! roundm_op_litmode_internal {
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($ins:literal, $in:expr, $out:expr => $outy:ident, $mode:literal $(,)?) => {
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asm!(
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concat!($ins, " {}, {}, ", $mode),
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out($outy) $out,
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in(freg) $in,
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)
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};
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}
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macro_rules! gen_roundm_op_litmode {
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[$($ty:ident => $reg:ident),* $(,)?] => {
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macro_rules! roundm_op_litmode {
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$(
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($ins:literal, $in:expr, $out:expr => $ty, $mode:literal) => {
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roundm_op_litmode_internal!($ins, $in, $out => $reg, $mode)
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};
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)*
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}
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};
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}
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gen_roundm_op_litmode![
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f32 => freg,
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f64 => freg,
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i64 => reg,
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];
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macro_rules! fnsdef {
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{$(
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$(#[$attr:meta])*
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$vis:vis fn $name:ident($from:ident -> $to:ident): $ins:literal;
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)*} => {$(
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$(#[$attr])*
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$vis fn $name(val: $from, mode: RoundingMode) -> $to {
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let result: $to;
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unsafe {
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match mode {
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RoundingMode::NearestEven => roundm_op_litmode!($ins, val, result => $to, "rne"),
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RoundingMode::Truncate => roundm_op_litmode!($ins, val, result => $to, "rtz"),
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RoundingMode::Up => roundm_op_litmode!($ins, val, result => $to, "rup"),
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RoundingMode::Down => roundm_op_litmode!($ins, val, result => $to, "rdn"),
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}
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}
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result
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}
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)*};
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}
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fnsdef! {
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/// Convert [`f64`] to [`f32`] with chosen rounding mode
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pub fn conv64to32(f64 -> f32): "fcvt.s.d";
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/// Convert [`f32`] to [`i64`] with chosen rounding mode
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pub fn f32toint(f32 -> i64): "fcvt.l.s";
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/// Convert [`f64`] to [`i64`] with chosen rounding mode
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pub fn f64toint(f64 -> i64): "fcvt.l.d";
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}
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