Auto merge of rust-lang#122905 - dpaoliello:sync-portable-simd-2024-03-22, r=workingjubilee

Portable SIMD subtree update

Syncs nightly to the latest changes from rust-lang/portable-simd

r? `@calebzulawski`

Author: bors

library/portable-simd/.github/workflows/ci.yml

@@ -141,6 +141,11 @@ jobs:
       - name: Test (release)
         run: cargo test --verbose --target=${{ matrix.target }} --release
 
+      - name: Generate docs
+        run: cargo doc --verbose --target=${{ matrix.target }}
+        env:
+          RUSTDOCFLAGS: -Dwarnings
+
   wasm-tests:
     name: "wasm (firefox, ${{ matrix.name }})"
     runs-on: ubuntu-latest

library/portable-simd/Cargo.lock

@@ -177,6 +177,9 @@ name = "std_float"
 version = "0.1.0"
 dependencies = [
  "core_simd",
+ "test_helpers",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
 ]
 
 [[package]]

library/portable-simd/crates/core_simd/src/lib.rs

@@ -13,11 +13,12 @@
     simd_ffi,
     staged_api,
     strict_provenance,
+    prelude_import,
     ptr_metadata
 )]
 #![cfg_attr(
     all(
-        any(target_arch = "aarch64", target_arch = "arm",),
+        any(target_arch = "aarch64", target_arch = "arm64ec", target_arch = "arm",),
         any(
             all(target_feature = "v6", not(target_feature = "mclass")),
             all(target_feature = "mclass", target_feature = "dsp"),
@@ -33,12 +34,21 @@
     any(target_arch = "powerpc", target_arch = "powerpc64"),
     feature(stdarch_powerpc)
 )]
+#![cfg_attr(
+    all(target_arch = "x86_64", target_feature = "avx512f"),
+    feature(stdarch_x86_avx512)
+)]
 #![warn(missing_docs, clippy::missing_inline_in_public_items)] // basically all items, really
 #![deny(unsafe_op_in_unsafe_fn, clippy::undocumented_unsafe_blocks)]
+#![doc(test(attr(deny(warnings))))]
 #![allow(internal_features)]
 #![unstable(feature = "portable_simd", issue = "86656")]
 //! Portable SIMD module.
 
+#[prelude_import]
+#[allow(unused_imports)]
+use core::prelude::v1::*;
+
 #[path = "mod.rs"]
 mod core_simd;
 pub use self::core_simd::simd;

library/portable-simd/crates/core_simd/src/masks.rs

@@ -34,6 +34,7 @@ mod sealed {
         fn eq(self, other: Self) -> bool;
 
         fn to_usize(self) -> usize;
+        fn max_unsigned() -> u64;
 
         type Unsigned: SimdElement;
 
@@ -78,6 +79,11 @@ macro_rules! impl_element {
                 self as usize
             }
 
+            #[inline]
+            fn max_unsigned() -> u64 {
+                <$unsigned>::MAX as u64
+            }
+
             type Unsigned = $unsigned;
 
             const TRUE: Self = -1;

library/portable-simd/crates/core_simd/src/swizzle_dyn.rs

@@ -16,7 +16,10 @@ where
     #[inline]
     pub fn swizzle_dyn(self, idxs: Simd<u8, N>) -> Self {
         #![allow(unused_imports, unused_unsafe)]
-        #[cfg(all(target_arch = "aarch64", target_endian = "little"))]
+        #[cfg(all(
+            any(target_arch = "aarch64", target_arch = "arm64ec"),
+            target_endian = "little"
+        ))]
         use core::arch::aarch64::{uint8x8_t, vqtbl1q_u8, vtbl1_u8};
         #[cfg(all(
             target_arch = "arm",
@@ -37,6 +40,7 @@ where
                 #[cfg(all(
                     any(
                         target_arch = "aarch64",
+                        target_arch = "arm64ec",
                         all(target_arch = "arm", target_feature = "v7")
                     ),
                     target_feature = "neon",
@@ -48,7 +52,7 @@ where
                 #[cfg(target_feature = "simd128")]
                 16 => transize(wasm::i8x16_swizzle, self, idxs),
                 #[cfg(all(
-                    target_arch = "aarch64",
+                    any(target_arch = "aarch64", target_arch = "arm64ec"),
                     target_feature = "neon",
                     target_endian = "little"
                 ))]

library/portable-simd/crates/core_simd/src/vector.rs

@@ -1,5 +1,6 @@
 use crate::simd::{
     cmp::SimdPartialOrd,
+    num::SimdUint,
     ptr::{SimdConstPtr, SimdMutPtr},
     LaneCount, Mask, MaskElement, SupportedLaneCount, Swizzle,
 };
@@ -262,6 +263,7 @@ where
     /// # Panics
     ///
     /// Panics if the slice's length is less than the vector's `Simd::N`.
+    /// Use `load_or_default` for an alternative that does not panic.
     ///
     /// # Example
     ///
@@ -315,6 +317,143 @@ where
         unsafe { self.store(slice.as_mut_ptr().cast()) }
     }
 
+    /// Reads contiguous elements from `slice`. Elements are read so long as they're in-bounds for
+    /// the `slice`. Otherwise, the default value for the element type is returned.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::Simd;
+    /// let vec: Vec<i32> = vec![10, 11];
+    ///
+    /// let result = Simd::<i32, 4>::load_or_default(&vec);
+    /// assert_eq!(result, Simd::from_array([10, 11, 0, 0]));
+    /// ```
+    #[must_use]
+    #[inline]
+    pub fn load_or_default(slice: &[T]) -> Self
+    where
+        T: Default,
+    {
+        Self::load_or(slice, Default::default())
+    }
+
+    /// Reads contiguous elements from `slice`. Elements are read so long as they're in-bounds for
+    /// the `slice`. Otherwise, the corresponding value from `or` is passed through.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::Simd;
+    /// let vec: Vec<i32> = vec![10, 11];
+    /// let or = Simd::from_array([-5, -4, -3, -2]);
+    ///
+    /// let result = Simd::load_or(&vec, or);
+    /// assert_eq!(result, Simd::from_array([10, 11, -3, -2]));
+    /// ```
+    #[must_use]
+    #[inline]
+    pub fn load_or(slice: &[T], or: Self) -> Self {
+        Self::load_select(slice, Mask::splat(true), or)
+    }
+
+    /// Reads contiguous elements from `slice`. Each element is read from memory if its
+    /// corresponding element in `enable` is `true`.
+    ///
+    /// When the element is disabled or out of bounds for the slice, that memory location
+    /// is not accessed and the corresponding value from `or` is passed through.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::{Simd, Mask};
+    /// let vec: Vec<i32> = vec![10, 11, 12, 13, 14, 15, 16, 17, 18];
+    /// let enable = Mask::from_array([true, true, false, true]);
+    /// let or = Simd::from_array([-5, -4, -3, -2]);
+    ///
+    /// let result = Simd::load_select(&vec, enable, or);
+    /// assert_eq!(result, Simd::from_array([10, 11, -3, 13]));
+    /// ```
+    #[must_use]
+    #[inline]
+    pub fn load_select_or_default(slice: &[T], enable: Mask<<T as SimdElement>::Mask, N>) -> Self
+    where
+        T: Default,
+    {
+        Self::load_select(slice, enable, Default::default())
+    }
+
+    /// Reads contiguous elements from `slice`. Each element is read from memory if its
+    /// corresponding element in `enable` is `true`.
+    ///
+    /// When the element is disabled or out of bounds for the slice, that memory location
+    /// is not accessed and the corresponding value from `or` is passed through.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::{Simd, Mask};
+    /// let vec: Vec<i32> = vec![10, 11, 12, 13, 14, 15, 16, 17, 18];
+    /// let enable = Mask::from_array([true, true, false, true]);
+    /// let or = Simd::from_array([-5, -4, -3, -2]);
+    ///
+    /// let result = Simd::load_select(&vec, enable, or);
+    /// assert_eq!(result, Simd::from_array([10, 11, -3, 13]));
+    /// ```
+    #[must_use]
+    #[inline]
+    pub fn load_select(
+        slice: &[T],
+        mut enable: Mask<<T as SimdElement>::Mask, N>,
+        or: Self,
+    ) -> Self {
+        enable &= mask_up_to(slice.len());
+        // SAFETY: We performed the bounds check by updating the mask. &[T] is properly aligned to
+        // the element.
+        unsafe { Self::load_select_ptr(slice.as_ptr(), enable, or) }
+    }
+
+    /// Reads contiguous elements from `slice`. Each element is read from memory if its
+    /// corresponding element in `enable` is `true`.
+    ///
+    /// When the element is disabled, that memory location is not accessed and the corresponding
+    /// value from `or` is passed through.
+    #[must_use]
+    #[inline]
+    pub unsafe fn load_select_unchecked(
+        slice: &[T],
+        enable: Mask<<T as SimdElement>::Mask, N>,
+        or: Self,
+    ) -> Self {
+        let ptr = slice.as_ptr();
+        // SAFETY: The safety of reading elements from `slice` is ensured by the caller.
+        unsafe { Self::load_select_ptr(ptr, enable, or) }
+    }
+
+    /// Reads contiguous elements starting at `ptr`. Each element is read from memory if its
+    /// corresponding element in `enable` is `true`.
+    ///
+    /// When the element is disabled, that memory location is not accessed and the corresponding
+    /// value from `or` is passed through.
+    #[must_use]
+    #[inline]
+    pub unsafe fn load_select_ptr(
+        ptr: *const T,
+        enable: Mask<<T as SimdElement>::Mask, N>,
+        or: Self,
+    ) -> Self {
+        // SAFETY: The safety of reading elements through `ptr` is ensured by the caller.
+        unsafe { core::intrinsics::simd::simd_masked_load(enable.to_int(), ptr, or) }
+    }
+
     /// Reads from potentially discontiguous indices in `slice` to construct a SIMD vector.
     /// If an index is out-of-bounds, the element is instead selected from the `or` vector.
     ///
@@ -493,6 +632,77 @@ where
         unsafe { core::intrinsics::simd::simd_gather(or, source, enable.to_int()) }
     }
 
+    /// Conditionally write contiguous elements to `slice`. The `enable` mask controls
+    /// which elements are written, as long as they're in-bounds of the `slice`.
+    /// If the element is disabled or out of bounds, no memory access to that location
+    /// is made.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::{Simd, Mask};
+    /// let mut arr = [0i32; 4];
+    /// let write = Simd::from_array([-5, -4, -3, -2]);
+    /// let enable = Mask::from_array([false, true, true, true]);
+    ///
+    /// write.store_select(&mut arr[..3], enable);
+    /// assert_eq!(arr, [0, -4, -3, 0]);
+    /// ```
+    #[inline]
+    pub fn store_select(self, slice: &mut [T], mut enable: Mask<<T as SimdElement>::Mask, N>) {
+        enable &= mask_up_to(slice.len());
+        // SAFETY: We performed the bounds check by updating the mask. &[T] is properly aligned to
+        // the element.
+        unsafe { self.store_select_ptr(slice.as_mut_ptr(), enable) }
+    }
+
+    /// Conditionally write contiguous elements to `slice`. The `enable` mask controls
+    /// which elements are written.
+    ///
+    /// # Safety
+    ///
+    /// Every enabled element must be in bounds for the `slice`.
+    ///
+    /// # Examples
+    /// ```
+    /// # #![feature(portable_simd)]
+    /// # #[cfg(feature = "as_crate")] use core_simd::simd;
+    /// # #[cfg(not(feature = "as_crate"))] use core::simd;
+    /// # use simd::{Simd, Mask};
+    /// let mut arr = [0i32; 4];
+    /// let write = Simd::from_array([-5, -4, -3, -2]);
+    /// let enable = Mask::from_array([false, true, true, true]);
+    ///
+    /// unsafe { write.store_select_unchecked(&mut arr, enable) };
+    /// assert_eq!(arr, [0, -4, -3, -2]);
+    /// ```
+    #[inline]
+    pub unsafe fn store_select_unchecked(
+        self,
+        slice: &mut [T],
+        enable: Mask<<T as SimdElement>::Mask, N>,
+    ) {
+        let ptr = slice.as_mut_ptr();
+        // SAFETY: The safety of writing elements in `slice` is ensured by the caller.
+        unsafe { self.store_select_ptr(ptr, enable) }
+    }
+
+    /// Conditionally write contiguous elements starting from `ptr`.
+    /// The `enable` mask controls which elements are written.
+    /// When disabled, the memory location corresponding to that element is not accessed.
+    ///
+    /// # Safety
+    ///
+    /// Memory addresses for element are calculated [`pointer::wrapping_offset`] and
+    /// each enabled element must satisfy the same conditions as [`core::ptr::write`].
+    #[inline]
+    pub unsafe fn store_select_ptr(self, ptr: *mut T, enable: Mask<<T as SimdElement>::Mask, N>) {
+        // SAFETY: The safety of writing elements through `ptr` is ensured by the caller.
+        unsafe { core::intrinsics::simd::simd_masked_store(enable.to_int(), ptr, self) }
+    }
+
     /// Writes the values in a SIMD vector to potentially discontiguous indices in `slice`.
     /// If an index is out-of-bounds, the write is suppressed without panicking.
     /// If two elements in the scattered vector would write to the same index
@@ -980,3 +1190,37 @@ where
 {
     type Mask = isize;
 }
+
+#[inline]
+fn lane_indices<const N: usize>() -> Simd<usize, N>
+where
+    LaneCount<N>: SupportedLaneCount,
+{
+    let mut index = [0; N];
+    for i in 0..N {
+        index[i] = i;
+    }
+    Simd::from_array(index)
+}
+
+#[inline]
+fn mask_up_to<M, const N: usize>(len: usize) -> Mask<M, N>
+where
+    LaneCount<N>: SupportedLaneCount,
+    M: MaskElement,
+{
+    let index = lane_indices::<N>();
+    let max_value: u64 = M::max_unsigned();
+    macro_rules! case {
+        ($ty:ty) => {
+            if N < <$ty>::MAX as usize && max_value as $ty as u64 == max_value {
+                return index.cast().simd_lt(Simd::splat(len.min(N) as $ty)).cast();
+            }
+        };
+    }
+    case!(u8);
+    case!(u16);
+    case!(u32);
+    case!(u64);
+    index.simd_lt(Simd::splat(len)).cast()
+}

library/portable-simd/crates/core_simd/src/vendor.rs

@@ -24,7 +24,7 @@ mod x86;
 #[cfg(target_arch = "wasm32")]
 mod wasm32;
 
-#[cfg(any(target_arch = "aarch64", target_arch = "arm",))]
+#[cfg(any(target_arch = "aarch64", target_arch = "arm64ec", target_arch = "arm",))]
 mod arm;
 
 #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]