diff --git a/.cargo/config.in b/.cargo/config.in
index 20b8c3f..6528cc8 100644
--- a/.cargo/config.in
+++ b/.cargo/config.in
@@ -70,7 +70,7 @@ rev = "746743227485a83123784df0c53227ab466612ed"
 [source."https://github.com/hsivonen/packed_simd"]
 git = "https://github.com/hsivonen/packed_simd"
 replace-with = "vendored-sources"
-rev = "c149d0a519bf878567c7630096737669ec2ff15f"
+rev = "90eebb82a107cbec1c8e406d9223819417e96de1"
 
 [source."https://github.com/hsivonen/chardetng_c"]
 git = "https://github.com/hsivonen/chardetng_c"
diff --git a/Cargo.lock b/Cargo.lock
index 5716fa1..9dfd4a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3952,10 +3952,11 @@ dependencies = [
 
 [[package]]
 name = "packed_simd_2"
-version = "0.3.7"
-source = "git+https://github.com/hsivonen/packed_simd?rev=c149d0a519bf878567c7630096737669ec2ff15f#c149d0a519bf878567c7630096737669ec2ff15f"
+version = "0.3.8"
+source = "git+https://github.com/hsivonen/packed_simd?rev=90eebb82a107cbec1c8e406d9223819417e96de1#90eebb82a107cbec1c8e406d9223819417e96de1"
 dependencies = [
  "cfg-if 1.0.0",
+ "rustc_version",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 012a938..f3f86d1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -145,7 +145,7 @@ chardetng_c = { git = "https://github.com/hsivonen/chardetng_c", rev="ed8a4c6f90
 coremidi = { git = "https://github.com/chris-zen/coremidi.git", rev="fc68464b5445caf111e41f643a2e69ccce0b4f83" }
 fog = { path = "toolkit/components/glean/api" }
 libudev-sys = { path = "dom/webauthn/libudev-sys" }
-packed_simd = { package = "packed_simd_2", git = "https://github.com/hsivonen/packed_simd", rev="c149d0a519bf878567c7630096737669ec2ff15f" }
+packed_simd = { package = "packed_simd_2", git = "https://github.com/hsivonen/packed_simd", rev="90eebb82a107cbec1c8e406d9223819417e96de1" }
 midir = { git = "https://github.com/mozilla/midir.git", rev = "4c11f0ffb5d6a10de4aff40a7b81218b33b94e6f" }
 minidump_writer_linux = { git = "https://github.com/rust-minidump/minidump-writer.git", rev = "75ada456c92a429704691a85e1cb42fef8cafc0d" }
 
diff --git a/supply-chain/audits.toml b/supply-chain/audits.toml
index 38ce792..ac84409 100644
--- a/supply-chain/audits.toml
+++ b/supply-chain/audits.toml
@@ -86,6 +86,11 @@ who = "Mike Hommey <mh+mozilla@glandium.org>"
 criteria = "safe-to-deploy"
 version = "0.4.17"
 
+[[audits.packed_simd_2]]
+who = "Mike Hommey <mh+mozilla@glandium.org>"
+criteria = "safe-to-deploy"
+delta = "0.3.7 -> 0.3.8"
+
 [[audits.rust_decimal]]
 who = "Mike Hommey <mh+mozilla@glandium.org>"
 criteria = "safe-to-deploy"
diff --git a/third_party/rust/packed_simd_2/Cargo.toml b/third_party/rust/packed_simd_2/Cargo.toml
index f38706d..d3d07ef 100644
--- a/third_party/rust/packed_simd_2/Cargo.toml
+++ b/third_party/rust/packed_simd_2/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "packed_simd_2"
-version = "0.3.7"
+version = "0.3.8"
 description = "Portable Packed SIMD vectors"
 documentation = "https://docs.rs/crate/packed_simd/"
 homepage = "https://github.com/rust-lang/packed_simd"
@@ -23,6 +23,9 @@ maintenance = { status = "experimental" }
 cfg-if = "1.0.0"
 core_arch = { version = "0.1.5", optional = true }
 
+[build-dependencies]
+rustc_version = "0.4"
+
 [features]
 default = []
 into_bits = []
diff --git a/third_party/rust/packed_simd_2/README.md b/third_party/rust/packed_simd_2/README.md
index 41a1512..eb3101c 100644
--- a/third_party/rust/packed_simd_2/README.md
+++ b/third_party/rust/packed_simd_2/README.md
@@ -8,7 +8,7 @@ If you need to continue to use the crate, we have published a "next version" und
 
 Adjust your `[dependencies]` section of `Cargo.toml` to be the following:
 ```toml
-packed_simd = { version = "0.3.6", package = "packed_simd_2" }
+packed_simd = { version = "0.3.8", package = "packed_simd_2" }
 ```
 
 # `Simd<[T; N]>`
diff --git a/third_party/rust/packed_simd_2/build.rs b/third_party/rust/packed_simd_2/build.rs
index e87298a..afdee9f 100644
--- a/third_party/rust/packed_simd_2/build.rs
+++ b/third_party/rust/packed_simd_2/build.rs
@@ -1,6 +1,11 @@
+use rustc_version::{version, Version};
+
 fn main() {
     let target = std::env::var("TARGET").expect("TARGET environment variable not defined");
     if target.contains("neon") {
         println!("cargo:rustc-cfg=libcore_neon");
     }
+    if version().unwrap() < Version::parse("1.61.0-alpha").unwrap() {
+        println!("cargo:rustc-cfg=aarch64_target_feature");
+    }
 }
diff --git a/third_party/rust/packed_simd_2/src/api.rs b/third_party/rust/packed_simd_2/src/api.rs
index 4e9c429..aa1403e 100644
--- a/third_party/rust/packed_simd_2/src/api.rs
+++ b/third_party/rust/packed_simd_2/src/api.rs
@@ -2,7 +2,7 @@
 
 #[macro_use]
 mod bitmask;
-crate mod cast;
+pub(crate) mod cast;
 #[macro_use]
 mod cmp;
 #[macro_use]
@@ -37,7 +37,7 @@ mod swap_bytes;
 mod bit_manip;
 
 #[cfg(feature = "into_bits")]
-crate mod into_bits;
+pub(crate) mod into_bits;
 
 macro_rules! impl_i {
     ([$elem_ty:ident; $elem_n:expr]: $tuple_id:ident, $mask_ty:ident
diff --git a/third_party/rust/packed_simd_2/src/codegen.rs b/third_party/rust/packed_simd_2/src/codegen.rs
index 9d1517e..8a9e971 100644
--- a/third_party/rust/packed_simd_2/src/codegen.rs
+++ b/third_party/rust/packed_simd_2/src/codegen.rs
@@ -1,19 +1,19 @@
 //! Code-generation utilities
 
-crate mod bit_manip;
-crate mod llvm;
-crate mod math;
-crate mod reductions;
-crate mod shuffle;
-crate mod shuffle1_dyn;
-crate mod swap_bytes;
+pub(crate) mod bit_manip;
+pub(crate) mod llvm;
+pub(crate) mod math;
+pub(crate) mod reductions;
+pub(crate) mod shuffle;
+pub(crate) mod shuffle1_dyn;
+pub(crate) mod swap_bytes;
 
 macro_rules! impl_simd_array {
     ([$elem_ty:ident; $elem_count:expr]:
      $tuple_id:ident | $($elem_tys:ident),*) => {
         #[derive(Copy, Clone)]
         #[repr(simd)]
-        pub struct $tuple_id($(crate $elem_tys),*);
+        pub struct $tuple_id($(pub(crate) $elem_tys),*);
         //^^^^^^^ leaked through SimdArray
 
         impl crate::sealed::Seal for [$elem_ty; $elem_count] {}
@@ -35,28 +35,28 @@ macro_rules! impl_simd_array {
     }
 }
 
-crate mod pointer_sized_int;
+pub(crate) mod pointer_sized_int;
 
-crate mod v16;
-crate use self::v16::*;
+pub(crate) mod v16;
+pub(crate) use self::v16::*;
 
-crate mod v32;
-crate use self::v32::*;
+pub(crate) mod v32;
+pub(crate) use self::v32::*;
 
-crate mod v64;
-crate use self::v64::*;
+pub(crate) mod v64;
+pub(crate) use self::v64::*;
 
-crate mod v128;
-crate use self::v128::*;
+pub(crate) mod v128;
+pub(crate) use self::v128::*;
 
-crate mod v256;
-crate use self::v256::*;
+pub(crate) mod v256;
+pub(crate) use self::v256::*;
 
-crate mod v512;
-crate use self::v512::*;
+pub(crate) mod v512;
+pub(crate) use self::v512::*;
 
-crate mod vSize;
-crate use self::vSize::*;
+pub(crate) mod vSize;
+pub(crate) use self::vSize::*;
 
-crate mod vPtr;
-crate use self::vPtr::*;
+pub(crate) mod vPtr;
+pub(crate) use self::vPtr::*;
diff --git a/third_party/rust/packed_simd_2/src/codegen/bit_manip.rs b/third_party/rust/packed_simd_2/src/codegen/bit_manip.rs
index 5986916..32d8d71 100644
--- a/third_party/rust/packed_simd_2/src/codegen/bit_manip.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/bit_manip.rs
@@ -1,7 +1,7 @@
 //! LLVM bit manipulation intrinsics.
 #[rustfmt::skip]
 
-use crate::*;
+pub(crate) use crate::*;
 
 #[allow(improper_ctypes, dead_code)]
 extern "C" {
@@ -147,7 +147,7 @@ extern "C" {
     fn ctpop_u128x4(x: u128x4) -> u128x4;
 }
 
-crate trait BitManip {
+pub(crate) trait BitManip {
     fn ctpop(self) -> Self;
     fn ctlz(self) -> Self;
     fn cttz(self) -> Self;
diff --git a/third_party/rust/packed_simd_2/src/codegen/llvm.rs b/third_party/rust/packed_simd_2/src/codegen/llvm.rs
index 52b11a9..b4c0984 100644
--- a/third_party/rust/packed_simd_2/src/codegen/llvm.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/llvm.rs
@@ -76,53 +76,53 @@ where
 }
 
 extern "platform-intrinsic" {
-    crate fn simd_eq<T, U>(x: T, y: T) -> U;
-    crate fn simd_ne<T, U>(x: T, y: T) -> U;
-    crate fn simd_lt<T, U>(x: T, y: T) -> U;
-    crate fn simd_le<T, U>(x: T, y: T) -> U;
-    crate fn simd_gt<T, U>(x: T, y: T) -> U;
-    crate fn simd_ge<T, U>(x: T, y: T) -> U;
-
-    crate fn simd_insert<T, U>(x: T, idx: u32, val: U) -> T;
-    crate fn simd_extract<T, U>(x: T, idx: u32) -> U;
-
-    crate fn simd_cast<T, U>(x: T) -> U;
-
-    crate fn simd_add<T>(x: T, y: T) -> T;
-    crate fn simd_sub<T>(x: T, y: T) -> T;
-    crate fn simd_mul<T>(x: T, y: T) -> T;
-    crate fn simd_div<T>(x: T, y: T) -> T;
-    crate fn simd_rem<T>(x: T, y: T) -> T;
-    crate fn simd_shl<T>(x: T, y: T) -> T;
-    crate fn simd_shr<T>(x: T, y: T) -> T;
-    crate fn simd_and<T>(x: T, y: T) -> T;
-    crate fn simd_or<T>(x: T, y: T) -> T;
-    crate fn simd_xor<T>(x: T, y: T) -> T;
-
-    crate fn simd_reduce_add_unordered<T, U>(x: T) -> U;
-    crate fn simd_reduce_mul_unordered<T, U>(x: T) -> U;
-    crate fn simd_reduce_add_ordered<T, U>(x: T, acc: U) -> U;
-    crate fn simd_reduce_mul_ordered<T, U>(x: T, acc: U) -> U;
-    crate fn simd_reduce_min<T, U>(x: T) -> U;
-    crate fn simd_reduce_max<T, U>(x: T) -> U;
-    crate fn simd_reduce_min_nanless<T, U>(x: T) -> U;
-    crate fn simd_reduce_max_nanless<T, U>(x: T) -> U;
-    crate fn simd_reduce_and<T, U>(x: T) -> U;
-    crate fn simd_reduce_or<T, U>(x: T) -> U;
-    crate fn simd_reduce_xor<T, U>(x: T) -> U;
-    crate fn simd_reduce_all<T>(x: T) -> bool;
-    crate fn simd_reduce_any<T>(x: T) -> bool;
-
-    crate fn simd_select<M, T>(m: M, a: T, b: T) -> T;
-
-    crate fn simd_fmin<T>(a: T, b: T) -> T;
-    crate fn simd_fmax<T>(a: T, b: T) -> T;
-
-    crate fn simd_fsqrt<T>(a: T) -> T;
-    crate fn simd_fma<T>(a: T, b: T, c: T) -> T;
-
-    crate fn simd_gather<T, P, M>(value: T, pointers: P, mask: M) -> T;
-    crate fn simd_scatter<T, P, M>(value: T, pointers: P, mask: M);
-
-    crate fn simd_bitmask<T, U>(value: T) -> U;
+    pub(crate) fn simd_eq<T, U>(x: T, y: T) -> U;
+    pub(crate) fn simd_ne<T, U>(x: T, y: T) -> U;
+    pub(crate) fn simd_lt<T, U>(x: T, y: T) -> U;
+    pub(crate) fn simd_le<T, U>(x: T, y: T) -> U;
+    pub(crate) fn simd_gt<T, U>(x: T, y: T) -> U;
+    pub(crate) fn simd_ge<T, U>(x: T, y: T) -> U;
+
+    pub(crate) fn simd_insert<T, U>(x: T, idx: u32, val: U) -> T;
+    pub(crate) fn simd_extract<T, U>(x: T, idx: u32) -> U;
+
+    pub(crate) fn simd_cast<T, U>(x: T) -> U;
+
+    pub(crate) fn simd_add<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_sub<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_mul<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_div<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_rem<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_shl<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_shr<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_and<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_or<T>(x: T, y: T) -> T;
+    pub(crate) fn simd_xor<T>(x: T, y: T) -> T;
+
+    pub(crate) fn simd_reduce_add_unordered<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_mul_unordered<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_add_ordered<T, U>(x: T, acc: U) -> U;
+    pub(crate) fn simd_reduce_mul_ordered<T, U>(x: T, acc: U) -> U;
+    pub(crate) fn simd_reduce_min<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_max<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_min_nanless<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_max_nanless<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_and<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_or<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_xor<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_all<T>(x: T) -> bool;
+    pub(crate) fn simd_reduce_any<T>(x: T) -> bool;
+
+    pub(crate) fn simd_select<M, T>(m: M, a: T, b: T) -> T;
+
+    pub(crate) fn simd_fmin<T>(a: T, b: T) -> T;
+    pub(crate) fn simd_fmax<T>(a: T, b: T) -> T;
+
+    pub(crate) fn simd_fsqrt<T>(a: T) -> T;
+    pub(crate) fn simd_fma<T>(a: T, b: T, c: T) -> T;
+
+    pub(crate) fn simd_gather<T, P, M>(value: T, pointers: P, mask: M) -> T;
+    pub(crate) fn simd_scatter<T, P, M>(value: T, pointers: P, mask: M);
+
+    pub(crate) fn simd_bitmask<T, U>(value: T) -> U;
 }
diff --git a/third_party/rust/packed_simd_2/src/codegen/math.rs b/third_party/rust/packed_simd_2/src/codegen/math.rs
index f3997c7..9a0ea7a 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math.rs
@@ -1,3 +1,3 @@
 //! Vertical math operations
 
-crate mod float;
+pub(crate) mod float;
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float.rs b/third_party/rust/packed_simd_2/src/codegen/math/float.rs
index 5e89bf6..ffbf18b 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float.rs
@@ -2,17 +2,17 @@
 #![allow(clippy::useless_transmute)]
 
 #[macro_use]
-crate mod macros;
-crate mod abs;
-crate mod cos;
-crate mod cos_pi;
-crate mod exp;
-crate mod ln;
-crate mod mul_add;
-crate mod mul_adde;
-crate mod powf;
-crate mod sin;
-crate mod sin_cos_pi;
-crate mod sin_pi;
-crate mod sqrt;
-crate mod sqrte;
+pub(crate) mod macros;
+pub(crate) mod abs;
+pub(crate) mod cos;
+pub(crate) mod cos_pi;
+pub(crate) mod exp;
+pub(crate) mod ln;
+pub(crate) mod mul_add;
+pub(crate) mod mul_adde;
+pub(crate) mod powf;
+pub(crate) mod sin;
+pub(crate) mod sin_cos_pi;
+pub(crate) mod sin_pi;
+pub(crate) mod sqrt;
+pub(crate) mod sqrte;
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/abs.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/abs.rs
index bc4421f..34aacc2 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/abs.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/abs.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Abs {
+pub(crate) trait Abs {
     fn abs(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/cos.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/cos.rs
index 50f6c16..dec390c 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/cos.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/cos.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Cos {
+pub(crate) trait Cos {
     fn cos(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/cos_pi.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/cos_pi.rs
index ebff5fd..e283280 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/cos_pi.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/cos_pi.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait CosPi {
+pub(crate) trait CosPi {
     fn cos_pi(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/exp.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/exp.rs
index 00d10e9..a7b2058 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/exp.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/exp.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Exp {
+pub(crate) trait Exp {
     fn exp(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/ln.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/ln.rs
index 88a5a6c..a5e38cb 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/ln.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/ln.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Ln {
+pub(crate) trait Ln {
     fn ln(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/mul_add.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/mul_add.rs
index f48a57d..d37f30f 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/mul_add.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/mul_add.rs
@@ -4,7 +4,7 @@ use crate::*;
 
 // FIXME: 64-bit 1 element mul_add
 
-crate trait MulAdd {
+pub(crate) trait MulAdd {
     fn mul_add(self, y: Self, z: Self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/mul_adde.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/mul_adde.rs
index b030c26..c0baeac 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/mul_adde.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/mul_adde.rs
@@ -3,7 +3,7 @@ use crate::*;
 
 // FIXME: 64-bit 1 element mul_adde
 
-crate trait MulAddE {
+pub(crate) trait MulAddE {
     fn mul_adde(self, y: Self, z: Self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/powf.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/powf.rs
index bc15067..89ca52e 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/powf.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/powf.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Powf {
+pub(crate) trait Powf {
     fn powf(self, x: Self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/sin.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/sin.rs
index 7b014d0..d881415 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/sin.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/sin.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Sin {
+pub(crate) trait Sin {
     fn sin(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/sin_cos_pi.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/sin_cos_pi.rs
index 75c2c2c..b283d11 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/sin_cos_pi.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/sin_cos_pi.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait SinCosPi: Sized {
+pub(crate) trait SinCosPi: Sized {
     type Output;
     fn sin_cos_pi(self) -> Self::Output;
 }
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/sin_pi.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/sin_pi.rs
index 72df98c..0c8f6bb 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/sin_pi.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/sin_pi.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait SinPi {
+pub(crate) trait SinPi {
     fn sin_pi(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/sqrt.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/sqrt.rs
index 7ce31df..67bb0a2 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/sqrt.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/sqrt.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait Sqrt {
+pub(crate) trait Sqrt {
     fn sqrt(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/math/float/sqrte.rs b/third_party/rust/packed_simd_2/src/codegen/math/float/sqrte.rs
index c1e379c..58a1de1 100644
--- a/third_party/rust/packed_simd_2/src/codegen/math/float/sqrte.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/math/float/sqrte.rs
@@ -6,7 +6,7 @@
 use crate::llvm::simd_fsqrt;
 use crate::*;
 
-crate trait Sqrte {
+pub(crate) trait Sqrte {
     fn sqrte(self) -> Self;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/pointer_sized_int.rs b/third_party/rust/packed_simd_2/src/codegen/pointer_sized_int.rs
index 39f493d..55cbc29 100644
--- a/third_party/rust/packed_simd_2/src/codegen/pointer_sized_int.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/pointer_sized_int.rs
@@ -4,24 +4,24 @@ use cfg_if::cfg_if;
 
 cfg_if! {
     if #[cfg(target_pointer_width = "8")] {
-        crate type isize_ = i8;
-        crate type usize_ = u8;
+        pub(crate) type isize_ = i8;
+        pub(crate) type usize_ = u8;
     } else if #[cfg(target_pointer_width = "16")] {
-        crate type isize_ = i16;
-        crate type usize_ = u16;
+        pub(crate) type isize_ = i16;
+        pub(crate) type usize_ = u16;
     } else if #[cfg(target_pointer_width = "32")] {
-        crate type isize_ = i32;
-        crate type usize_ = u32;
+        pub(crate) type isize_ = i32;
+        pub(crate) type usize_ = u32;
 
     } else if #[cfg(target_pointer_width = "64")] {
-        crate type isize_ = i64;
-        crate type usize_ = u64;
+        pub(crate) type isize_ = i64;
+        pub(crate) type usize_ = u64;
     } else if #[cfg(target_pointer_width = "64")] {
-        crate type isize_ = i64;
-        crate type usize_ = u64;
+        pub(crate) type isize_ = i64;
+        pub(crate) type usize_ = u64;
     } else if #[cfg(target_pointer_width = "128")] {
-        crate type isize_ = i128;
-        crate type usize_ = u128;
+        pub(crate) type isize_ = i128;
+        pub(crate) type usize_ = u128;
     } else {
         compile_error!("unsupported target_pointer_width");
     }
diff --git a/third_party/rust/packed_simd_2/src/codegen/reductions.rs b/third_party/rust/packed_simd_2/src/codegen/reductions.rs
index 7be4f5f..302ca6d 100644
--- a/third_party/rust/packed_simd_2/src/codegen/reductions.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/reductions.rs
@@ -1 +1 @@
-crate mod mask;
+pub(crate) mod mask;
diff --git a/third_party/rust/packed_simd_2/src/codegen/reductions/mask.rs b/third_party/rust/packed_simd_2/src/codegen/reductions/mask.rs
index 0aec609..a78bcc5 100644
--- a/third_party/rust/packed_simd_2/src/codegen/reductions/mask.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/reductions/mask.rs
@@ -7,11 +7,11 @@
 
 use crate::*;
 
-crate trait All: crate::marker::Sized {
+pub(crate) trait All: crate::marker::Sized {
     unsafe fn all(self) -> bool;
 }
 
-crate trait Any: crate::marker::Sized {
+pub(crate) trait Any: crate::marker::Sized {
     unsafe fn any(self) -> bool;
 }
 
diff --git a/third_party/rust/packed_simd_2/src/codegen/swap_bytes.rs b/third_party/rust/packed_simd_2/src/codegen/swap_bytes.rs
index a4435e3..9cf34a3 100644
--- a/third_party/rust/packed_simd_2/src/codegen/swap_bytes.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/swap_bytes.rs
@@ -5,7 +5,7 @@
 
 use crate::*;
 
-crate trait SwapBytes {
+pub(crate) trait SwapBytes {
     fn swap_bytes(self) -> Self;
 }
 
@@ -15,7 +15,7 @@ macro_rules! impl_swap_bytes {
             impl SwapBytes for $id {
                 #[inline]
                 fn swap_bytes(self) -> Self {
-                    unsafe { shuffle!(self, [1, 0]) }
+                    shuffle!(self, [1, 0])
                 }
             }
         )+
diff --git a/third_party/rust/packed_simd_2/src/codegen/vPtr.rs b/third_party/rust/packed_simd_2/src/codegen/vPtr.rs
index cf47655..abd3aa8 100644
--- a/third_party/rust/packed_simd_2/src/codegen/vPtr.rs
+++ b/third_party/rust/packed_simd_2/src/codegen/vPtr.rs
@@ -5,7 +5,7 @@ macro_rules! impl_simd_ptr {
      | $($tys:ty),*) => {
         #[derive(Copy, Clone)]
         #[repr(simd)]
-        pub struct $tuple_id<$ty>($(crate $tys),*);
+        pub struct $tuple_id<$ty>($(pub(crate) $tys),*);
         //^^^^^^^ leaked through SimdArray
 
         impl<$ty> crate::sealed::Seal for [$ptr_ty; $elem_count] {}
diff --git a/third_party/rust/packed_simd_2/src/lib.rs b/third_party/rust/packed_simd_2/src/lib.rs
index 840bae3..cd8a868 100644
--- a/third_party/rust/packed_simd_2/src/lib.rs
+++ b/third_party/rust/packed_simd_2/src/lib.rs
@@ -217,14 +217,13 @@
     rustc_attrs,
     platform_intrinsics,
     stdsimd,
-    aarch64_target_feature,
     arm_target_feature,
     link_llvm_intrinsics,
     core_intrinsics,
     stmt_expr_attributes,
-    crate_visibility_modifier,
     custom_inner_attributes,
 )]
+#![cfg_attr(aarch64_target_feature, feature(aarch64_target_feature))]
 #![allow(non_camel_case_types, non_snake_case,
         // FIXME: these types are unsound in C FFI already
         // See https://github.com/rust-lang/rust/issues/53346
@@ -344,6 +343,6 @@ pub use self::codegen::llvm::{
     __shuffle_vector8,
 };
 
-crate mod llvm {
-    crate use crate::codegen::llvm::*;
+pub(crate) mod llvm {
+    pub(crate) use crate::codegen::llvm::*;
 }
diff --git a/third_party/rust/packed_simd_2/src/testing.rs b/third_party/rust/packed_simd_2/src/testing.rs
index fcbcf9e..6320b28 100644
--- a/third_party/rust/packed_simd_2/src/testing.rs
+++ b/third_party/rust/packed_simd_2/src/testing.rs
@@ -5,4 +5,4 @@ mod macros;
 
 #[cfg(test)]
 #[macro_use]
-crate mod utils;
+pub(crate) mod utils;