Restructure crate as core module

Aligns module with rust-lang/library/core, creating an... unusual
architecture that is easier to pull in as a module, as core itself can
have no dependencies (as we haven't built core yet).

Author: workingjubilee

crates/core_simd/src/comparisons.rs

@@ -1,4 +1,5 @@
-use crate::{LaneCount, Mask, Simd, SimdElement, SupportedLaneCount};
+use crate::simd::intrinsics;
+use crate::simd::{LaneCount, Mask, Simd, SimdElement, SupportedLaneCount};
 
 impl<T, const LANES: usize> Simd<T, LANES>
 where
@@ -8,13 +9,13 @@ where
     /// Test if each lane is equal to the corresponding lane in `other`.
     #[inline]
     pub fn lanes_eq(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_eq(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_eq(self, other)) }
     }
 
     /// Test if each lane is not equal to the corresponding lane in `other`.
     #[inline]
     pub fn lanes_ne(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_ne(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_ne(self, other)) }
     }
 }
 
@@ -26,24 +27,24 @@ where
     /// Test if each lane is less than the corresponding lane in `other`.
     #[inline]
     pub fn lanes_lt(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_lt(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_lt(self, other)) }
     }
 
     /// Test if each lane is greater than the corresponding lane in `other`.
     #[inline]
     pub fn lanes_gt(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_gt(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_gt(self, other)) }
     }
 
     /// Test if each lane is less than or equal to the corresponding lane in `other`.
     #[inline]
     pub fn lanes_le(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_le(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_le(self, other)) }
     }
 
     /// Test if each lane is greater than or equal to the corresponding lane in `other`.
     #[inline]
     pub fn lanes_ge(self, other: Self) -> Mask<T::Mask, LANES> {
-        unsafe { Mask::from_int_unchecked(crate::intrinsics::simd_ge(self, other)) }
+        unsafe { Mask::from_int_unchecked(intrinsics::simd_ge(self, other)) }
     }
 }

crates/core_simd/src/core_simd_docs.md

@@ -0,0 +1,4 @@
+Portable SIMD module.
+
+This module offers a portable abstraction for SIMD operations
+that is not bound to any particular hardware architecture.

crates/core_simd/src/fmt.rs

@@ -1,17 +1,20 @@
+use crate::simd::{LaneCount, Simd, SimdElement, SupportedLaneCount};
+use core::fmt;
+
 macro_rules! impl_fmt_trait {
     { $($trait:ident,)* } => {
         $(
-            impl<T, const LANES: usize> core::fmt::$trait for crate::Simd<T, LANES>
+            impl<T, const LANES: usize> fmt::$trait for Simd<T, LANES>
             where
-                crate::LaneCount<LANES>: crate::SupportedLaneCount,
-                T: crate::SimdElement + core::fmt::$trait,
+                LaneCount<LANES>: SupportedLaneCount,
+                T: SimdElement + fmt::$trait,
             {
-                fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+                fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                     #[repr(transparent)]
-                    struct Wrapper<'a, T: core::fmt::$trait>(&'a T);
+                    struct Wrapper<'a, T: fmt::$trait>(&'a T);
 
-                    impl<T: core::fmt::$trait> core::fmt::Debug for Wrapper<'_, T> {
-                        fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+                    impl<T: fmt::$trait> fmt::Debug for Wrapper<'_, T> {
+                        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                             self.0.fmt(f)
                         }
                     }

crates/core_simd/src/intrinsics.rs

@@ -91,9 +91,9 @@ extern "platform-intrinsic" {
     pub(crate) fn simd_bitmask<T, U>(x: T) -> U;
 
     // select
-    pub(crate) fn simd_select<T, U>(m: T, a: U, b: U) -> U;
+    pub(crate) fn simd_select<M, T>(m: M, a: T, b: T) -> T;
     #[allow(unused)]
-    pub(crate) fn simd_select_bitmask<T, U>(m: T, a: U, b: U) -> U;
+    pub(crate) fn simd_select_bitmask<M, T>(m: M, a: T, b: T) -> T;
 }
 
 #[cfg(feature = "std")]
@@ -114,4 +114,4 @@ mod std {
 }
 
 #[cfg(feature = "std")]
-pub(crate) use crate::intrinsics::std::*;
+pub(crate) use crate::simd::intrinsics::std::*;

crates/core_simd/src/iter.rs

@@ -1,4 +1,4 @@
-use crate::{LaneCount, Simd, SupportedLaneCount};
+use crate::simd::{LaneCount, Simd, SupportedLaneCount};
 use core::{
     iter::{Product, Sum},
     ops::{Add, Mul},
@@ -15,7 +15,7 @@ macro_rules! impl_traits {
             }
         }
 
-        impl<const LANES: usize> core::iter::Product<Self> for Simd<$type, LANES>
+        impl<const LANES: usize> Product<Self> for Simd<$type, LANES>
         where
             LaneCount<LANES>: SupportedLaneCount,
         {

crates/core_simd/src/lib.rs

@@ -14,31 +14,6 @@
 #![unstable(feature = "portable_simd", issue = "86656")]
 //! Portable SIMD module.
 
-#[macro_use]
-mod permute;
-#[macro_use]
-mod reduction;
-
-mod select;
-pub use select::Select;
-
-#[cfg(feature = "generic_const_exprs")]
-mod to_bytes;
-
-mod comparisons;
-mod fmt;
-mod intrinsics;
-mod iter;
-mod math;
-mod ops;
-mod round;
-mod vendor;
-
-mod lane_count;
-pub use lane_count::*;
-
-mod masks;
-pub use masks::*;
-
-mod vector;
-pub use vector::*;
+#[path = "mod.rs"]
+mod core_simd;
+pub use self::core_simd::simd::*;

crates/core_simd/src/masks.rs

@@ -12,7 +12,9 @@
 )]
 mod mask_impl;
 
-use crate::{LaneCount, Simd, SimdElement, SupportedLaneCount};
+use crate::simd::{LaneCount, Simd, SimdElement, SupportedLaneCount};
+use core::cmp::Ordering;
+use core::fmt;
 
 /// Marker trait for types that may be used as SIMD mask elements.
 pub unsafe trait MaskElement: SimdElement {
@@ -251,17 +253,17 @@ where
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
-    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         self.0.partial_cmp(&other.0)
     }
 }
 
-impl<T, const LANES: usize> core::fmt::Debug for Mask<T, LANES>
+impl<T, const LANES: usize> fmt::Debug for Mask<T, LANES>
 where
-    T: MaskElement + core::fmt::Debug,
+    T: MaskElement + fmt::Debug,
     LaneCount<LANES>: SupportedLaneCount,
 {
-    fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_list()
             .entries((0..LANES).map(|lane| self.test(lane)))
             .finish()

crates/core_simd/src/masks/bitmask.rs

@@ -1,4 +1,5 @@
-use crate::{LaneCount, MaskElement, Simd, SupportedLaneCount};
+use crate::simd::intrinsics;
+use crate::simd::{LaneCount, Simd, SupportedLaneCount};
 use core::marker::PhantomData;
 
 /// A mask where each lane is represented by a single bit.
@@ -99,11 +100,7 @@ where
         unsafe {
             let mask: <LaneCount<LANES> as SupportedLaneCount>::IntBitMask =
                 core::mem::transmute_copy(&self);
-            crate::intrinsics::simd_select_bitmask(
-                mask,
-                Simd::splat(T::TRUE),
-                Simd::splat(T::FALSE),
-            )
+            intrinsics::simd_select_bitmask(mask, Simd::splat(T::TRUE), Simd::splat(T::FALSE))
         }
     }
 
@@ -115,7 +112,7 @@ where
             core::mem::size_of::<<LaneCount::<LANES> as SupportedLaneCount>::IntBitMask>(),
         );
         let mask: <LaneCount<LANES> as SupportedLaneCount>::IntBitMask =
-            crate::intrinsics::simd_bitmask(value);
+            intrinsics::simd_bitmask(value);
         Self(core::mem::transmute_copy(&mask), PhantomData)
     }
 

crates/core_simd/src/masks/full_masks.rs

@@ -1,7 +1,8 @@
 //! Masks that take up full SIMD vector registers.
 
 use super::MaskElement;
-use crate::{LaneCount, Simd, SupportedLaneCount};
+use crate::simd::intrinsics;
+use crate::simd::{LaneCount, Simd, SupportedLaneCount};
 
 #[repr(transparent)]
 pub struct Mask<T, const LANES: usize>(Simd<T, LANES>)
@@ -98,7 +99,7 @@ where
     where
         U: MaskElement,
     {
-        unsafe { Mask(crate::intrinsics::simd_cast(self.0)) }
+        unsafe { Mask(intrinsics::simd_cast(self.0)) }
     }
 
     #[cfg(feature = "generic_const_exprs")]
@@ -111,7 +112,7 @@ where
                 LaneCount::<LANES>::BITMASK_LEN,
             );
             let bitmask: <LaneCount<LANES> as SupportedLaneCount>::IntBitMask =
-                crate::intrinsics::simd_bitmask(self.0);
+                intrinsics::simd_bitmask(self.0);
             let mut bitmask: [u8; LaneCount::<LANES>::BITMASK_LEN] =
                 core::mem::transmute_copy(&bitmask);
 
@@ -149,7 +150,7 @@ where
             let bitmask: <LaneCount<LANES> as SupportedLaneCount>::IntBitMask =
                 core::mem::transmute_copy(&bitmask);
 
-            Self::from_int_unchecked(crate::intrinsics::simd_select_bitmask(
+            Self::from_int_unchecked(intrinsics::simd_select_bitmask(
                 bitmask,
                 Self::splat(true).to_int(),
                 Self::splat(false).to_int(),
@@ -159,12 +160,12 @@ where
 
     #[inline]
     pub fn any(self) -> bool {
-        unsafe { crate::intrinsics::simd_reduce_any(self.to_int()) }
+        unsafe { intrinsics::simd_reduce_any(self.to_int()) }
     }
 
     #[inline]
     pub fn all(self) -> bool {
-        unsafe { crate::intrinsics::simd_reduce_all(self.to_int()) }
+        unsafe { intrinsics::simd_reduce_all(self.to_int()) }
     }
 }
 
@@ -186,7 +187,7 @@ where
     type Output = Self;
     #[inline]
     fn bitand(self, rhs: Self) -> Self {
-        unsafe { Self(crate::intrinsics::simd_and(self.0, rhs.0)) }
+        unsafe { Self(intrinsics::simd_and(self.0, rhs.0)) }
     }
 }
 
@@ -198,7 +199,7 @@ where
     type Output = Self;
     #[inline]
     fn bitor(self, rhs: Self) -> Self {
-        unsafe { Self(crate::intrinsics::simd_or(self.0, rhs.0)) }
+        unsafe { Self(intrinsics::simd_or(self.0, rhs.0)) }
     }
 }
 
@@ -210,7 +211,7 @@ where
     type Output = Self;
     #[inline]
     fn bitxor(self, rhs: Self) -> Self {
-        unsafe { Self(crate::intrinsics::simd_xor(self.0, rhs.0)) }
+        unsafe { Self(intrinsics::simd_xor(self.0, rhs.0)) }
     }
 }
 

crates/core_simd/src/math.rs

@@ -1,4 +1,5 @@
-use crate::{LaneCount, Simd, SupportedLaneCount};
+use crate::simd::intrinsics::{simd_saturating_add, simd_saturating_sub};
+use crate::simd::{LaneCount, Simd, SupportedLaneCount};
 
 macro_rules! impl_uint_arith {
     ($($ty:ty),+) => {
@@ -20,7 +21,7 @@ macro_rules! impl_uint_arith {
             /// ```
             #[inline]
             pub fn saturating_add(self, second: Self) -> Self {
-                unsafe { crate::intrinsics::simd_saturating_add(self, second) }
+                unsafe { simd_saturating_add(self, second) }
             }
 
             /// Lanewise saturating subtract.
@@ -38,7 +39,7 @@ macro_rules! impl_uint_arith {
             /// assert_eq!(sat, Simd::splat(0));
             #[inline]
             pub fn saturating_sub(self, second: Self) -> Self {
-                unsafe { crate::intrinsics::simd_saturating_sub(self, second) }
+                unsafe { simd_saturating_sub(self, second) }
             }
         })+
     }
@@ -64,7 +65,7 @@ macro_rules! impl_int_arith {
             /// ```
             #[inline]
             pub fn saturating_add(self, second: Self) -> Self {
-                unsafe { crate::intrinsics::simd_saturating_add(self, second) }
+                unsafe { simd_saturating_add(self, second) }
             }
 
             /// Lanewise saturating subtract.
@@ -82,7 +83,7 @@ macro_rules! impl_int_arith {
             /// assert_eq!(sat, Simd::from_array([MIN, MIN, MIN, 0]));
             #[inline]
             pub fn saturating_sub(self, second: Self) -> Self {
-                unsafe { crate::intrinsics::simd_saturating_sub(self, second) }
+                unsafe { simd_saturating_sub(self, second) }
             }
 
             /// Lanewise absolute value, implemented in Rust.

crates/core_simd/src/mod.rs

@@ -0,0 +1,33 @@
+#[macro_use]
+mod permute;
+#[macro_use]
+mod reduction;
+
+mod select;
+
+#[cfg(feature = "generic_const_exprs")]
+mod to_bytes;
+
+mod comparisons;
+mod fmt;
+mod intrinsics;
+mod iter;
+mod math;
+mod ops;
+mod round;
+mod vendor;
+
+mod lane_count;
+
+mod masks;
+
+mod vector;
+
+#[doc = include_str!("core_simd_docs.md")]
+pub mod simd {
+    pub use crate::core_simd::lane_count::*;
+    pub use crate::core_simd::masks::*;
+    pub use crate::core_simd::select::Select;
+    pub use crate::core_simd::vector::*;
+    pub(crate) use crate::core_simd::*;
+}