diff --git a/crates/assert-instr-macro/src/lib.rs b/crates/assert-instr-macro/src/lib.rs
index ba33dcfda9..a76e535b1c 100644
--- a/crates/assert-instr-macro/src/lib.rs
+++ b/crates/assert-instr-macro/src/lib.rs
@@ -100,6 +100,7 @@ pub fn assert_instr(
     let to_test = quote! {
         #attrs
         #[no_mangle]
+        #[inline(never)]
         unsafe extern #abi fn #shim_name(#(#inputs),*) #ret {
             // The compiler in optimized mode by default runs a pass called
             // "mergefunc" where it'll merge functions that look identical.
@@ -113,6 +114,8 @@ pub fn assert_instr(
             // codegen but is otherwise unique to prevent code from being
             // folded.
             ::stdsimd_test::_DONT_DEDUP = #shim_name_str;
+            asm!("" : : "r"(_DONT_DEDUP as usize) : : "clobber" : "volatile");
+
             #name(#(#input_vals),*)
         }
     };
@@ -129,6 +132,8 @@ pub fn assert_instr(
         #[allow(non_snake_case)]
         fn #assert_name() {
             #to_test
+            // leak the function address:
+            asm!("" : : "r"(#to_test as usize) : : "clobber" : "volatile");
 
             ::stdsimd_test::assert(#shim_name as usize,
                                    stringify!(#shim_name),
diff --git a/crates/core_arch/src/lib.rs b/crates/core_arch/src/lib.rs
index 2049558fd9..424a185f88 100644
--- a/crates/core_arch/src/lib.rs
+++ b/crates/core_arch/src/lib.rs
@@ -5,6 +5,7 @@
 #![feature(
     const_fn,
     const_fn_union,
+    custom_inner_attributes,
     link_llvm_intrinsics,
     platform_intrinsics,
     repr_simd,
@@ -75,4 +76,4 @@ mod core_arch;
 pub use self::core_arch::arch::*;
 
 #[allow(unused_imports)]
-use core::{ffi, hint, intrinsics, marker, mem, ptr, sync};
+use core::{ffi, hint, intrinsics, marker, mem, ops, ptr, sync};
diff --git a/crates/core_arch/src/powerpc/altivec.rs b/crates/core_arch/src/powerpc/altivec.rs
index 6858757d5d..2bcec9374b 100644
--- a/crates/core_arch/src/powerpc/altivec.rs
+++ b/crates/core_arch/src/powerpc/altivec.rs
@@ -285,7 +285,7 @@ impl_from! { i8x16, u8x16,  i16x8, u16x8, i32x4, u32x4, f32x4 }
 
 macro_rules! impl_neg {
     ($s: ident : $zero: expr) => {
-        impl core::ops::Neg for s_t_l!($s) {
+        impl crate::ops::Neg for s_t_l!($s) {
             type Output = s_t_l!($s);
             fn neg(self) -> Self::Output {
                 let zero = $s::splat($zero);
diff --git a/crates/stdsimd-test/src/lib.rs b/crates/stdsimd-test/src/lib.rs
index a405412b42..ca106e7f56 100644
--- a/crates/stdsimd-test/src/lib.rs
+++ b/crates/stdsimd-test/src/lib.rs
@@ -206,7 +206,15 @@ fn get_functions(fnptr: usize, fnname: &mut String) -> &'static [Function] {
 
     if let Some(sym) = &sym {
         if let Some(s) = DISASSEMBLY.get(sym) {
-            *fnname = sym.to_string();
+            let name = sym.to_string();
+
+            // on macosx the symbol names don't have leading `_`:
+            while fnname.starts_with('_') {
+                *fnname = fnname[1..].to_string();
+            }
+
+            assert_eq!(*fnname, name);
+            *fnname = name;
             return s;
         }
     }