diff --git a/crates/core_simd/src/lib.rs b/crates/core_simd/src/lib.rs
index 82873162969..a6359d1e0be 100644
--- a/crates/core_simd/src/lib.rs
+++ b/crates/core_simd/src/lib.rs
@@ -21,4 +21,3 @@
 #[path = "mod.rs"]
 mod core_simd;
 pub use self::core_simd::simd;
-pub use simd::*;
diff --git a/crates/core_simd/tests/autoderef.rs b/crates/core_simd/tests/autoderef.rs
index 9359da16ee5..3181826ef59 100644
--- a/crates/core_simd/tests/autoderef.rs
+++ b/crates/core_simd/tests/autoderef.rs
@@ -1,6 +1,6 @@
 // Test that we handle all our "auto-deref" cases correctly.
 #![feature(portable_simd)]
-use core_simd::f32x4;
+use core_simd::simd::f32x4;
 
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen_test::*;
diff --git a/crates/core_simd/tests/mask_ops_impl/mask_macros.rs b/crates/core_simd/tests/mask_ops_impl/mask_macros.rs
index 795f9e27c44..faafa5fa51f 100644
--- a/crates/core_simd/tests/mask_ops_impl/mask_macros.rs
+++ b/crates/core_simd/tests/mask_ops_impl/mask_macros.rs
@@ -2,7 +2,7 @@ macro_rules! mask_tests {
     { $vector:ident, $lanes:literal } => {
         #[cfg(test)]
         mod $vector {
-            use core_simd::$vector as Vector;
+            use core_simd::simd::$vector as Vector;
             const LANES: usize = $lanes;
 
             #[cfg(target_arch = "wasm32")]
diff --git a/crates/core_simd/tests/masks.rs b/crates/core_simd/tests/masks.rs
index 673d0db93fe..9f8bad1c36c 100644
--- a/crates/core_simd/tests/masks.rs
+++ b/crates/core_simd/tests/masks.rs
@@ -13,11 +13,13 @@ mod $type {
             #[cfg(target_arch = "wasm32")]
             use wasm_bindgen_test::*;
 
+            use core_simd::simd::Mask;
+
             #[test]
             #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
             fn set_and_test() {
                 let values = [true, false, false, true, false, false, true, false];
-                let mut mask = core_simd::Mask::<$type, 8>::splat(false);
+                let mut mask = Mask::<$type, 8>::splat(false);
                 for (lane, value) in values.iter().copied().enumerate() {
                     mask.set(lane, value);
                 }
@@ -29,7 +31,7 @@ fn set_and_test() {
             #[test]
             #[should_panic]
             fn set_invalid_lane() {
-                let mut mask = core_simd::Mask::<$type, 8>::splat(false);
+                let mut mask = Mask::<$type, 8>::splat(false);
                 mask.set(8, true);
                 let _ = mask;
             }
@@ -37,24 +39,24 @@ fn set_invalid_lane() {
             #[test]
             #[should_panic]
             fn test_invalid_lane() {
-                let mask = core_simd::Mask::<$type, 8>::splat(false);
+                let mask = Mask::<$type, 8>::splat(false);
                 let _ = mask.test(8);
             }
 
             #[test]
             fn any() {
-                assert!(!core_simd::Mask::<$type, 8>::splat(false).any());
-                assert!(core_simd::Mask::<$type, 8>::splat(true).any());
-                let mut v = core_simd::Mask::<$type, 8>::splat(false);
+                assert!(!Mask::<$type, 8>::splat(false).any());
+                assert!(Mask::<$type, 8>::splat(true).any());
+                let mut v = Mask::<$type, 8>::splat(false);
                 v.set(2, true);
                 assert!(v.any());
             }
 
             #[test]
             fn all() {
-                assert!(!core_simd::Mask::<$type, 8>::splat(false).all());
-                assert!(core_simd::Mask::<$type, 8>::splat(true).all());
-                let mut v = core_simd::Mask::<$type, 8>::splat(false);
+                assert!(!Mask::<$type, 8>::splat(false).all());
+                assert!(Mask::<$type, 8>::splat(true).all());
+                let mut v = Mask::<$type, 8>::splat(false);
                 v.set(2, true);
                 assert!(!v.all());
             }
@@ -62,57 +64,57 @@ fn all() {
             #[test]
             fn roundtrip_int_conversion() {
                 let values = [true, false, false, true, false, false, true, false];
-                let mask = core_simd::Mask::<$type, 8>::from_array(values);
+                let mask = Mask::<$type, 8>::from_array(values);
                 let int = mask.to_int();
                 assert_eq!(int.to_array(), [-1, 0, 0, -1, 0, 0, -1, 0]);
-                assert_eq!(core_simd::Mask::<$type, 8>::from_int(int), mask);
+                assert_eq!(Mask::<$type, 8>::from_int(int), mask);
             }
 
             #[test]
             fn roundtrip_bitmask_conversion() {
-                use core_simd::ToBitMask;
+                use core_simd::simd::ToBitMask;
                 let values = [
                     true, false, false, true, false, false, true, false,
                     true, true, false, false, false, false, false, true,
                 ];
-                let mask = core_simd::Mask::<$type, 16>::from_array(values);
+                let mask = Mask::<$type, 16>::from_array(values);
                 let bitmask = mask.to_bitmask();
                 assert_eq!(bitmask, 0b1000001101001001);
-                assert_eq!(core_simd::Mask::<$type, 16>::from_bitmask(bitmask), mask);
+                assert_eq!(Mask::<$type, 16>::from_bitmask(bitmask), mask);
             }
 
             #[test]
             fn roundtrip_bitmask_conversion_short() {
-                use core_simd::ToBitMask;
+                use core_simd::simd::ToBitMask;
 
                 let values = [
                     false, false, false, true,
                 ];
-                let mask = core_simd::Mask::<$type, 4>::from_array(values);
+                let mask = Mask::<$type, 4>::from_array(values);
                 let bitmask = mask.to_bitmask();
                 assert_eq!(bitmask, 0b1000);
-                assert_eq!(core_simd::Mask::<$type, 4>::from_bitmask(bitmask), mask);
+                assert_eq!(Mask::<$type, 4>::from_bitmask(bitmask), mask);
 
                 let values = [true, false];
-                let mask = core_simd::Mask::<$type, 2>::from_array(values);
+                let mask = Mask::<$type, 2>::from_array(values);
                 let bitmask = mask.to_bitmask();
                 assert_eq!(bitmask, 0b01);
-                assert_eq!(core_simd::Mask::<$type, 2>::from_bitmask(bitmask), mask);
+                assert_eq!(Mask::<$type, 2>::from_bitmask(bitmask), mask);
             }
 
             #[test]
             fn cast() {
-                fn cast_impl<T: core_simd::MaskElement>()
+                fn cast_impl<T: core_simd::simd::MaskElement>()
                 where
-                    core_simd::Mask<$type, 8>: Into<core_simd::Mask<T, 8>>,
+                    Mask<$type, 8>: Into<Mask<T, 8>>,
                 {
                     let values = [true, false, false, true, false, false, true, false];
-                    let mask = core_simd::Mask::<$type, 8>::from_array(values);
+                    let mask = Mask::<$type, 8>::from_array(values);
 
                     let cast_mask = mask.cast::<T>();
                     assert_eq!(values, cast_mask.to_array());
 
-                    let into_mask: core_simd::Mask<T, 8> = mask.into();
+                    let into_mask: Mask<T, 8> = mask.into();
                     assert_eq!(values, into_mask.to_array());
                 }
 
@@ -126,15 +128,15 @@ fn cast_impl<T: core_simd::MaskElement>()
             #[cfg(feature = "generic_const_exprs")]
             #[test]
             fn roundtrip_bitmask_array_conversion() {
-                use core_simd::ToBitMaskArray;
+                use core_simd::simd::ToBitMaskArray;
                 let values = [
                     true, false, false, true, false, false, true, false,
                     true, true, false, false, false, false, false, true,
                 ];
-                let mask = core_simd::Mask::<$type, 16>::from_array(values);
+                let mask = Mask::<$type, 16>::from_array(values);
                 let bitmask = mask.to_bitmask_array();
                 assert_eq!(bitmask, [0b01001001, 0b10000011]);
-                assert_eq!(core_simd::Mask::<$type, 16>::from_bitmask_array(bitmask), mask);
+                assert_eq!(Mask::<$type, 16>::from_bitmask_array(bitmask), mask);
             }
         }
     }
@@ -150,9 +152,10 @@ mod mask_api {
 
 #[test]
 fn convert() {
+    use core_simd::simd::Mask;
     let values = [true, false, false, true, false, false, true, false];
     assert_eq!(
-        core_simd::Mask::<i8, 8>::from_array(values),
-        core_simd::Mask::<i32, 8>::from_array(values).into()
+        Mask::<i8, 8>::from_array(values),
+        Mask::<i32, 8>::from_array(values).into()
     );
 }
diff --git a/crates/core_simd/tests/ops_macros.rs b/crates/core_simd/tests/ops_macros.rs
index f759394d075..3a02f3f01e1 100644
--- a/crates/core_simd/tests/ops_macros.rs
+++ b/crates/core_simd/tests/ops_macros.rs
@@ -7,7 +7,7 @@ macro_rules! impl_unary_op_test {
         test_helpers::test_lanes! {
             fn $fn<const LANES: usize>() {
                 test_helpers::test_unary_elementwise(
-                    &<core_simd::Simd<$scalar, LANES> as core::ops::$trait>::$fn,
+                    &<core_simd::simd::Simd<$scalar, LANES> as core::ops::$trait>::$fn,
                     &$scalar_fn,
                     &|_| true,
                 );
@@ -27,7 +27,7 @@ macro_rules! impl_binary_op_test {
     { $scalar:ty, $trait:ident :: $fn:ident, $trait_assign:ident :: $fn_assign:ident, $scalar_fn:expr } => {
         mod $fn {
             use super::*;
-            use core_simd::Simd;
+            use core_simd::simd::Simd;
 
             test_helpers::test_lanes! {
                 fn normal<const LANES: usize>() {
@@ -64,7 +64,7 @@ macro_rules! impl_binary_checked_op_test {
     { $scalar:ty, $trait:ident :: $fn:ident, $trait_assign:ident :: $fn_assign:ident, $scalar_fn:expr, $check_fn:expr } => {
         mod $fn {
             use super::*;
-            use core_simd::Simd;
+            use core_simd::simd::Simd;
 
             test_helpers::test_lanes! {
                 fn normal<const LANES: usize>() {
@@ -173,7 +173,7 @@ macro_rules! impl_signed_tests {
     { $scalar:tt } => {
         mod $scalar {
             use core_simd::simd::SimdInt;
-            type Vector<const LANES: usize> = core_simd::Simd<Scalar, LANES>;
+            type Vector<const LANES: usize> = core_simd::simd::Simd<Scalar, LANES>;
             type Scalar = $scalar;
 
             impl_common_integer_tests! { Vector, Scalar }
@@ -314,7 +314,7 @@ macro_rules! impl_unsigned_tests {
     { $scalar:tt } => {
         mod $scalar {
             use core_simd::simd::SimdUint;
-            type Vector<const LANES: usize> = core_simd::Simd<Scalar, LANES>;
+            type Vector<const LANES: usize> = core_simd::simd::Simd<Scalar, LANES>;
             type Scalar = $scalar;
 
             impl_common_integer_tests! { Vector, Scalar }
@@ -348,8 +348,8 @@ fn rem_zero_panic<const LANES: usize>() {
 macro_rules! impl_float_tests {
     { $scalar:tt, $int_scalar:tt } => {
         mod $scalar {
-            use core_simd::SimdFloat;
-            type Vector<const LANES: usize> = core_simd::Simd<Scalar, LANES>;
+            use core_simd::simd::SimdFloat;
+            type Vector<const LANES: usize> = core_simd::simd::Simd<Scalar, LANES>;
             type Scalar = $scalar;
 
             impl_unary_op_test!(Scalar, Neg::neg);
diff --git a/crates/core_simd/tests/pointers.rs b/crates/core_simd/tests/pointers.rs
index 2b0008624ad..0ae8f83b8b9 100644
--- a/crates/core_simd/tests/pointers.rs
+++ b/crates/core_simd/tests/pointers.rs
@@ -1,6 +1,6 @@
 #![feature(portable_simd, strict_provenance)]
 
-use core_simd::{Simd, SimdConstPtr, SimdMutPtr};
+use core_simd::simd::{Simd, SimdConstPtr, SimdMutPtr};
 
 macro_rules! common_tests {
     { $constness:ident } => {
diff --git a/crates/core_simd/tests/round.rs b/crates/core_simd/tests/round.rs
index 484fd5bf47d..8b9638ad466 100644
--- a/crates/core_simd/tests/round.rs
+++ b/crates/core_simd/tests/round.rs
@@ -5,7 +5,7 @@ macro_rules! float_rounding_test {
         mod $scalar {
             use std_float::StdFloat;
 
-            type Vector<const LANES: usize> = core_simd::Simd<$scalar, LANES>;
+            type Vector<const LANES: usize> = core_simd::simd::Simd<$scalar, LANES>;
             type Scalar = $scalar;
             type IntScalar = $int_scalar;
 
diff --git a/crates/core_simd/tests/swizzle.rs b/crates/core_simd/tests/swizzle.rs
index 33a7becb421..8cd7c33e823 100644
--- a/crates/core_simd/tests/swizzle.rs
+++ b/crates/core_simd/tests/swizzle.rs
@@ -1,5 +1,5 @@
 #![feature(portable_simd)]
-use core_simd::{Simd, Swizzle};
+use core_simd::simd::{Simd, Swizzle};
 
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen_test::*;
diff --git a/crates/core_simd/tests/to_bytes.rs b/crates/core_simd/tests/to_bytes.rs
index debb4335e2c..be0ee4349c5 100644
--- a/crates/core_simd/tests/to_bytes.rs
+++ b/crates/core_simd/tests/to_bytes.rs
@@ -2,7 +2,7 @@
 #![allow(incomplete_features)]
 #![cfg(feature = "generic_const_exprs")]
 
-use core_simd::Simd;
+use core_simd::simd::Simd;
 
 #[test]
 fn byte_convert() {
diff --git a/crates/core_simd/tests/try_from_slice.rs b/crates/core_simd/tests/try_from_slice.rs
index 189c18c6039..859e3b94f2c 100644
--- a/crates/core_simd/tests/try_from_slice.rs
+++ b/crates/core_simd/tests/try_from_slice.rs
@@ -6,7 +6,7 @@
 #[cfg(target_arch = "wasm32")]
 wasm_bindgen_test_configure!(run_in_browser);
 
-use core_simd::i32x4;
+use core_simd::simd::i32x4;
 
 #[test]
 #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
diff --git a/crates/test_helpers/src/lib.rs b/crates/test_helpers/src/lib.rs
index 5f2a928b5e4..b26cdc311a2 100644
--- a/crates/test_helpers/src/lib.rs
+++ b/crates/test_helpers/src/lib.rs
@@ -401,7 +401,7 @@ mod $test {
 
                 fn implementation<const $lanes: usize>()
                 where
-                    core_simd::LaneCount<$lanes>: core_simd::SupportedLaneCount,
+                    core_simd::simd::LaneCount<$lanes>: core_simd::simd::SupportedLaneCount,
                 $body
 
                 #[cfg(target_arch = "wasm32")]
@@ -508,7 +508,7 @@ mod $test {
 
                 fn implementation<const $lanes: usize>()
                 where
-                    core_simd::LaneCount<$lanes>: core_simd::SupportedLaneCount,
+                    core_simd::simd::LaneCount<$lanes>: core_simd::simd::SupportedLaneCount,
                 $body
 
                 $crate::test_lanes_helper!(