1 files changed, 128 insertions, 0 deletions
diff --git a/src/arm32/signed/mod.rs b/src/arm32/signed/mod.rs
new file mode 100644
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--- /dev/null
+++ b/src/arm32/signed/mod.rs
@@ -0,0 +1,128 @@
+// Copyright 2024 Gabriel Bjørnager Jensen.
+//
+// This file is part of Pollex.
+//
+// Pollex is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Af-
+// fero General Public License as published by the
+// Free Software Foundation, either version 3 of
+// the License, or (at your option) any later ver-
+// sion.
+//
+// Pollex is distributed in the hope that it will
+// be useful, but WITHOUT ANY WARRANTY; without
+// even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Af-
+// fero General Public License along with Pollex.
+// If not, see <https://www.gnu.org/licenses/>.
+
+use crate::arm32::Unsigned;
+
+use core::cmp::Ordering;
+use core::fmt::{Display, Formatter};
+use core::ops::{Add, Div, Mul, Sub};
+
+/// A signed word.
+///
+/// This type defines the [`Add`], [`Sub`], [`Mul`], and [`Div`] traits for `Self` and [`i32`].
+/// Internally, these implementations use wrapping arithemtic.
+#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct Signed(i32);
+
+impl Signed {
+ /// Constructs a new word.
+ #[inline(always)]
+ #[must_use]
+ pub const fn new(value: i32) -> Self { Self(value) }
+
+ /// Retrieves the word's value.
+ #[inline(always)]
+ #[must_use]
+ pub const fn get(self) -> i32 { self.0 }
+
+ /// Sets the value of the word.
+ #[inline(always)]
+ pub fn set(&mut self, value: i32) { self.0 = value }
+
+ /// Reinterprets the word as unsigned.
+ #[inline(always)]
+ #[must_use]
+ pub const fn as_unsigned(self) -> Unsigned { Unsigned::new(self.0 as u32) }
+}
+
+impl Add<Self> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn add(self, rhs: Self) -> Self::Output { self + rhs.get() }
+}
+
+impl Add<i32> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn add(self, rhs: i32) -> Self::Output { Self(self.0.wrapping_add(rhs)) }
+}
+
+impl Display for Signed {
+ #[inline(always)]
+ fn fmt(&self, f: &mut Formatter) -> core::fmt::Result {
+ write!(f, "#{:+}", self.0)
+ }
+}
+
+impl Div<Self> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn div(self, rhs: Self) -> Self::Output { self / rhs.get() }
+}
+
+impl Div<i32> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn div(self, rhs: i32) -> Self::Output { Self(self.0.wrapping_div(rhs)) }
+}
+
+impl Mul<Self> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn mul(self, rhs: Self) -> Self::Output { self * rhs.get() }
+}
+
+impl Mul<i32> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn mul(self, rhs: i32) -> Self::Output { Self(self.0.wrapping_mul(rhs)) }
+}
+
+impl Sub<Self> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn sub(self, rhs: Self) -> Self::Output { self - rhs.get() }
+}
+
+impl Sub<i32> for Signed {
+ type Output = Self;
+
+ #[inline(always)]
+ fn sub(self, rhs: i32) -> Self::Output { Self(self.0.wrapping_sub(rhs)) }
+}
+
+impl PartialEq<i32> for Signed {
+ #[inline(always)]
+ fn eq(&self, other: &i32) -> bool { self.0 == *other }
+}
+
+impl PartialOrd<i32> for Signed {
+ #[inline(always)]
+ fn partial_cmp(&self, other: &i32) -> Option<Ordering> { self.0.partial_cmp(other) }
+}