Remove CUDA support relying on abandoned toolchain

CHANGELOG

@@ -1,3 +1,6 @@
+## Unreleased
+- The `cuda` feature has been removed, as the toolchain it depends on is long abandoned.
+
 ## Release v0.8.1 (04 Apr. 2023)
 - Add implementation of `rkyv` serialization/deserialization to the `Wide*` wrapper types.
 

Cargo.toml

@@ -21,7 +21,6 @@ partial_fixed_point_support = [ "fixed", "cordic" ]
 serde_serialize = [ "serde", "fixed/serde" ]
 rkyv-serialize = [ "rkyv" ]
 libm = [ "num-traits/libm" ]
-cuda = [ "cuda_std", "cust_core" ]
 
 [dependencies]
 num-traits  = { version = "0.2.11", default-features = false }
@@ -37,8 +36,6 @@ rand        = { version = "0.8", optional = true }
 serde       = { version = "1", default-features = false, optional = true }
 rkyv        = { version = "0.7", optional = true }
 libm_force  = { package = "libm", version = "0.2", optional = true }
-cuda_std    = { version = "0.2", optional = true }
-cust_core   = { version = "0.1", optional = true }
 
 [package.metadata.docs.rs]
 all-features = true

src/scalar/complex.rs

@@ -6,13 +6,6 @@ use std::ops::Neg;
 use std::{f32, f64};
 
 use crate::scalar::{Field, RealField, SubsetOf, SupersetOf};
-#[cfg(all(
-    any(target_arch = "nvptx", target_arch = "nvptx64"),
-    not(feature = "std"),
-    not(feature = "libm_force"),
-    feature = "cuda"
-))]
-use cuda_std::GpuFloat;
 #[cfg(all(not(feature = "std"), not(feature = "libm_force"), feature = "libm"))]
 use num::Float;
 //#[cfg(feature = "decimal")]
@@ -493,17 +486,6 @@ impl_complex!(
     f64,f64,f64
 );
 
-#[cfg(all(
-    any(target_arch = "nvptx", target_arch = "nvptx64"),
-    not(feature = "std"),
-    not(feature = "libm_force"),
-    feature = "cuda"
-))]
-impl_complex!(
-    f32, f32, GpuFloat;
-    f64, f64, GpuFloat
-);
-
 #[cfg(feature = "libm_force")]
 impl ComplexField for f32 {
     type RealField = f32;

src/scalar/real.rs

@@ -5,13 +5,6 @@ use approx::{RelativeEq, UlpsEq};
 
 use crate::scalar::ComplexField;
 
-#[cfg(all(
-    any(target_arch = "nvptx", target_arch = "nvptx64"),
-    not(feature = "std"),
-    not(feature = "libm_force"),
-    feature = "cuda"
-))]
-use cuda_std::GpuFloat;
 #[cfg(all(not(feature = "std"), not(feature = "libm_force"), feature = "libm"))]
 use num::Float;
 //#[cfg(feature = "decimal")]
@@ -225,16 +218,6 @@ macro_rules! impl_real(
 impl_real!(f32, f32, Float, Float; f64, f64, Float, Float);
 #[cfg(all(feature = "std", not(feature = "libm_force")))]
 impl_real!(f32, f32, f32, f32; f64, f64, f64, f64);
-#[cfg(all(
-    any(target_arch = "nvptx", target_arch = "nvptx64"),
-    not(feature = "std"),
-    not(feature = "libm_force"),
-    feature = "cuda"
-))]
-impl_real!(
-    f32, f32, GpuFloat, GpuFloat;
-    f64, f64, GpuFloat, GpuFloat
-);
 #[cfg(feature = "libm_force")]
 impl_real!(f32, f32, libm_force_f32, libm_force_f32; f64, f64, libm_force, libm_force);
 

src/simd/auto_simd_impl.rs

@@ -46,7 +46,6 @@ macro_rules! ident_to_value(
     derive(rkyv::Archive, rkyv::Deserialize, rkyv::Serialize),
     archive(as = "Self", bound(archive = "N: rkyv::Archive<Archived = N>"))
 )]
-#[cfg_attr(feature = "cuda", derive(cust_core::DeviceCopy))]
 pub struct AutoSimd<N>(pub N);
 
 /// A SIMD boolean structure that implements all the relevant traits from `num` an `simba`.
@@ -669,7 +668,7 @@ macro_rules! impl_float_simd(
 
         impl Field for AutoSimd<$t> {}
 
-        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force", all(any(target_arch = "nvptx", target_arch = "nvptx64"), feature = "cuda")))]
+        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force"))]
         impl SimdRealField for AutoSimd<$t> {
             #[inline(always)]
             fn simd_atan2(self, other: Self) -> Self {
@@ -763,7 +762,7 @@ macro_rules! impl_float_simd(
             }
         }
 
-        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force", all(any(target_arch = "nvptx", target_arch = "nvptx64"), feature = "cuda")))]
+        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force"))]
         impl SimdComplexField for AutoSimd<$t> {
             type SimdRealField = Self;
 
@@ -1029,7 +1028,7 @@ macro_rules! impl_float_simd(
         // NOTE: most of the impls in there are copy-paste from the implementation of
         // ComplexField for num_complex::Complex. Unfortunately, we can't reuse the implementations
         // so easily.
-        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force", all(any(target_arch = "nvptx", target_arch = "nvptx64"), feature = "cuda")))]
+        #[cfg(any(feature = "std", feature = "libm", feature = "libm_force"))]
         impl SimdComplexField for num_complex::Complex<AutoSimd<$t>> {
             type SimdRealField = AutoSimd<$t>;