Merge pull request #353 from rust-lang/sync-upstream-2023-06-07

Sync upstream

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-
+resolver = "1"
 members = [
     "crates/core_simd",
     "crates/std_float",

crates/core_simd/examples/nbody.rs

@@ -187,7 +187,7 @@ mod tests {
 fn main() {
     {
         let (energy_before, energy_after) = nbody::run(1000);
-        println!("Energy before: {}", energy_before);
-        println!("Energy after:  {}", energy_after);
+        println!("Energy before: {energy_before}");
+        println!("Energy after:  {energy_after}");
     }
 }

crates/core_simd/examples/spectral_norm.rs

@@ -69,7 +69,7 @@ fn dot(x: &[f64], y: &[f64]) -> f64 {
 #[cfg(test)]
 #[test]
 fn test() {
-    assert_eq!(&format!("{:.9}", spectral_norm(100)), "1.274219991");
+    assert_eq!(format!("{:.9}", spectral_norm(100)), "1.274219991");
 }
 
 fn main() {

crates/core_simd/src/intrinsics.rs

@@ -68,7 +68,6 @@ extern "platform-intrinsic" {
     pub(crate) fn simd_cast<T, U>(x: T) -> U;
     /// follows Rust's `T as U` semantics, including saturating float casts
     /// which amounts to the same as `simd_cast` for many cases
-    #[cfg(not(bootstrap))]
     pub(crate) fn simd_as<T, U>(x: T) -> U;
 
     /// neg/fneg
@@ -101,7 +100,7 @@ extern "platform-intrinsic" {
     /// val: vector of values to select if a lane is masked
     /// ptr: vector of pointers to read from
     /// mask: a "wide" mask of integers, selects as if simd_select(mask, read(ptr), val)
-    /// note, the LLVM intrinsic accepts a mask vector of <N x i1>
+    /// note, the LLVM intrinsic accepts a mask vector of `<N x i1>`
     /// FIXME: review this if/when we fix up our mask story in general?
     pub(crate) fn simd_gather<T, U, V>(val: T, ptr: U, mask: V) -> T;
     /// llvm.masked.scatter

crates/core_simd/src/masks.rs

@@ -88,7 +88,7 @@ impl_element! { isize }
 /// The layout of this type is unspecified, and may change between platforms
 /// and/or Rust versions, and code should not assume that it is equivalent to
 /// `[T; LANES]`.
-#[repr(transparent)]
+#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/90435
 pub struct Mask<T, const LANES: usize>(mask_impl::Mask<T, LANES>)
 where
     T: MaskElement,

crates/core_simd/src/masks/full_masks.rs

@@ -260,7 +260,7 @@ where
     }
 }
 
-impl<T, const LANES: usize> core::convert::From<Mask<T, LANES>> for Simd<T, LANES>
+impl<T, const LANES: usize> From<Mask<T, LANES>> for Simd<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,

crates/core_simd/src/ops.rs

@@ -42,7 +42,7 @@ macro_rules! unsafe_base {
 
 /// SAFETY: This macro should not be used for anything except Shl or Shr, and passed the appropriate shift intrinsic.
 /// It handles performing a bitand in addition to calling the shift operator, so that the result
-/// is well-defined: LLVM can return a poison value if you shl, lshr, or ashr if rhs >= <Int>::BITS
+/// is well-defined: LLVM can return a poison value if you shl, lshr, or ashr if `rhs >= <Int>::BITS`
 /// At worst, this will maybe add another instruction and cycle,
 /// at best, it may open up more optimization opportunities,
 /// or simply be elided entirely, especially for SIMD ISAs which default to this.

crates/core_simd/src/ops/deref.rs

@@ -71,7 +71,7 @@ macro_rules! deref_ops {
 
                 #[inline]
                 #[must_use = "operator returns a new vector without mutating the inputs"]
-                fn $call(self, rhs: &$simd) -> Self::Output {
+                fn $call(self, rhs: &'rhs $simd) -> Self::Output {
                     (*self).$call(*rhs)
                 }
             }

crates/core_simd/src/swizzle_dyn.rs

@@ -18,7 +18,12 @@ where
         #![allow(unused_imports, unused_unsafe)]
         #[cfg(all(target_arch = "aarch64", target_endian = "little"))]
         use core::arch::aarch64::{uint8x8_t, vqtbl1q_u8, vtbl1_u8};
-        #[cfg(all(target_arch = "arm", target_feature = "v7", target_endian = "little"))]
+        #[cfg(all(
+            target_arch = "arm",
+            target_feature = "v7",
+            target_feature = "neon",
+            target_endian = "little"
+        ))]
         use core::arch::arm::{uint8x8_t, vtbl1_u8};
         #[cfg(target_arch = "wasm32")]
         use core::arch::wasm32 as wasm;

crates/core_simd/src/vector.rs

@@ -25,7 +25,7 @@ use core::convert::{TryFrom, TryInto};
 /// let sum = array::from_fn(|i| a[i] + b[i]);
 /// let prod = array::from_fn(|i| a[i] * b[i]);
 ///
-/// // `Simd<T, N>` implements `From<[T; N]>
+/// // `Simd<T, N>` implements `From<[T; N]>`
 /// let (v, w) = (Simd::from(a), Simd::from(b));
 /// // Which means arrays implement `Into<Simd<T, N>>`.
 /// assert_eq!(v + w, sum.into());