diff --git a/linalg/arm64/arm64simd/arm64simd_act_f32_32n.tmpl b/linalg/arm64/arm64simd/arm64simd_act_f32_32n.tmpl
new file mode 100644
index 0000000000..2462e373b7
--- /dev/null
+++ b/linalg/arm64/arm64simd/arm64simd_act_f32_32n.tmpl
@@ -0,0 +1,29 @@
+// vim: ft=arm
+
+// C tile regs: v16 to v31, (scratch)
+// - x19-x29 to preserve (but x19, x28, x29 not used) 
+// - d8..d15 to preserve
+// - v16 to v31, no need to preserve
+
+.text
+.align 4
+
+.cpu generic+fp+simd
+.global {{G}}arm64simd_act_f32_32n_{{suffix}}
+{{G}}arm64simd_act_f32_32n_{{suffix}}:
+
+    stp         d8, d9, [sp, #-16]!
+    stp         d10, d11, [sp, #-16]!
+    stp         d12, d13, [sp, #-16]!
+    stp         d14, d15, [sp, #-16]!
+
+    mov         x0, 0
+//    b           .return
+
+.return:
+    ldp         d14, d15, [sp], #16
+    ldp         d12, d13, [sp], #16
+    ldp         d10, d11, [sp], #16
+    ldp         d8, d9, [sp], #16
+
+    ret
diff --git a/linalg/src/arm64/arm64simd.rs b/linalg/src/arm64/arm64simd.rs
index ab03e9654b..8ec9d8618e 100644
--- a/linalg/src/arm64/arm64simd.rs
+++ b/linalg/src/arm64/arm64simd.rs
@@ -44,3 +44,6 @@ sigmoid_impl!(f32, arm64simd_sigmoid_f32_4n, 4, 4, true);
 tanh_impl!(f16, arm64fp16_tanh_f16_8n, 8, 8, crate::arm64::has_fp16());
 #[cfg(not(feature="no_fp16"))]
 sigmoid_impl!(f16, arm64fp16_sigmoid_f16_8n, 8, 8, crate::arm64::has_fp16());
+
+act_impl!(f32, arm64simd_act_f32_32n, 32, 4, true);
+
diff --git a/linalg/src/frame/activations.rs b/linalg/src/frame/activations.rs
index 8b604b4998..5586c16973 100644
--- a/linalg/src/frame/activations.rs
+++ b/linalg/src/frame/activations.rs
@@ -96,19 +96,20 @@ where
 }
 
 macro_rules! act_impl {
-    ($ti: ident, $func: ident, $nr: expr, $alignment_items: expr) => {
+    ($ti: ident, $func: ident, $nr: expr, $alignment_items: expr, $cond: expr) => {
         paste! {
             mod [<sys_ $func>] {
                 #[allow(unused_imports)]
                 use tract_data::prelude::f16;
-                extern_kernel!(fn $func(ptr: *mut $ti, count: usize) -> ());
+                use crate::frame::activations::Op;
+                extern_kernel!(fn $func(ops: *const Op, constants: *const $ti, xs: *mut $ti, len: usize) -> usize);
             }
 
             #[derive(Copy, Clone, Debug)]
             #[allow(non_camel_case_types)]
             pub struct $func;
 
-            impl ActivationKer<$ti> for $func {
+            impl $crate::frame::activations::ActivationKer<$ti> for $func {
                 #[inline(always)]
                 fn name() -> &'static str {
                     stringify!($func)
@@ -126,10 +127,14 @@ macro_rules! act_impl {
                     $alignment_items * std::mem::size_of::<$ti>()
                 }
                 #[inline(never)]
-                fn run(ops: &Op, csts:&[T], buf: &mut [$ti]) {
-                    unsafe { [<sys_ $func>]::$func(ops.as_ptr(), csts.as_ptr(), buf.as_mut_ptr(), buf.len()) }
+                fn run(ops: &[$crate::frame::activations::Op], csts:&[$ti], buf: &mut [$ti]) {
+                    let err = unsafe { [<sys_ $func>]::$func(ops.as_ptr(), csts.as_ptr(), buf.as_mut_ptr(), buf.len()) };
+                    assert_eq!(err, 0);
                 }
             }
+
+            #[cfg(test)]
+            act_tests!($cond, $func, $ti);
         }
     };
 }
diff --git a/linalg/src/frame/activations/tests.rs b/linalg/src/frame/activations/tests.rs
index 197608ff2e..fb916e856c 100644
--- a/linalg/src/frame/activations/tests.rs
+++ b/linalg/src/frame/activations/tests.rs
@@ -1,8 +1,22 @@
-macro_rules! prop_activation {
+use crate::LADatum;
+
+use super::{Program, Op};
+use Op::*;
+
+pub fn noop<T: LADatum>() -> Program<T> {
+    Program { ops: vec![Done], csts: vec![] }
+}
+
+macro_rules! prop_act_e2e {
     ($cond:expr, $ti: ty, $ker: ty, $name: ident ( $($param:ident),* )) => {
         proptest::proptest! {
             #[test]
-            fn $name(x in proptest::prelude::any::<$ti>(), repeat in 1usize..4, $($param in proptest::prelude::any::<$ti>()),*) {
+            fn $name(
+                x in proptest::prelude::any::<$ti>(),
+                repeat in 1usize..4,
+                $($param in proptest::prelude::any::<$ti>()),*) 
+            {
+                use crate::frame::activations::ActivationKer;
                 if $cond {
                     let mut input = tract_data::prelude::Tensor::zero_aligned::<$ti>(&[<$ker>::nr() * repeat], <$ker>::alignment_bytes()).unwrap();
                     input.fill_t::<$ti>(x).unwrap();
@@ -18,18 +32,47 @@ macro_rules! prop_activation {
     }
 }
 
+macro_rules! prop_act_unit {
+    ($cond:expr, $ti: ty, $ker: ty, $name: ident ( $($param:ident),* ), $refer: expr) => {
+        proptest::proptest! {
+            #[test]
+            fn $name(
+                x in proptest::prelude::any::<$ti>(),
+                repeat in 1usize..4,
+                $($param in proptest::prelude::any::<$ti>()),*) 
+            {
+                use crate::frame::activations::ActivationKer;
+                if $cond {
+                    let mut input = tract_data::prelude::Tensor::zero_aligned::<$ti>(&[<$ker>::nr() * repeat], <$ker>::alignment_bytes()).unwrap();
+                    input.fill_t::<$ti>(x).unwrap();
+                    let refer2: fn($ti) -> $ti = $refer;
+                    let expected:Vec<$ti> = input.as_slice::<$ti>().unwrap().iter().cloned().map(refer2).collect();
+                    let prog = crate::frame::activations::tests::$name($($param),*);
+                    <$ker>::run(&prog.ops, &prog.csts, &mut input.as_slice_mut::<$ti>().unwrap());
+
+                    let expected = tract_data::prelude::tensor1(&expected);
+                    expected.close_enough(&input, true).unwrap();
+                }
+            }
+        }
+    }
+}
+
 #[macro_export]
-macro_rules! act_frame_tests {
+macro_rules! act_tests {
     ($cond:expr, $ker:ty, $ti:ty) => {
-        prop_activation!($cond, $ti, $ker, relu());
-        prop_activation!($cond, $ti, $ker, affine(alpha, beta));
-        prop_activation!($cond, $ti, $ker, leaky_relu(alpha));
-        prop_activation!($cond, $ti, $ker, threshold_relu(alpha));
-        prop_activation!($cond, $ti, $ker, softsign());
-        prop_activation!($cond, $ti, $ker, hardswish());
+        prop_act_unit!($cond, $ti, $ker, noop(), |x| x);
+
+        prop_act_e2e!($cond, $ti, $ker, relu());
+        prop_act_e2e!($cond, $ti, $ker, affine(alpha, beta));
+        prop_act_e2e!($cond, $ti, $ker, leaky_relu(alpha));
+        prop_act_e2e!($cond, $ti, $ker, threshold_relu(alpha));
+        prop_act_e2e!($cond, $ti, $ker, softsign());
+        prop_act_e2e!($cond, $ti, $ker, hardswish());
         /*
         prop_activation!($cond, $ti, $ker, sigmoid());
         prop_activation!($cond, $ti, $ker, exp2f());
         */
     };
 }
+
diff --git a/linalg/src/generic/activations.rs b/linalg/src/generic/activations.rs
index c76eace069..48fccc8cf3 100644
--- a/linalg/src/generic/activations.rs
+++ b/linalg/src/generic/activations.rs
@@ -94,5 +94,20 @@ impl ActivationKer<f32> for SActivations {
 }
 
 #[cfg(test)]
-act_frame_tests!(true, SActivations, f32);
+act_tests!(true, SActivations, f32);
 
+#[cfg(test)]
+mod tests {
+    use crate::frame::activations::Op;
+    use crate::frame::activations::ActivationKer;
+
+    use super::SActivations;
+
+    #[test]
+    fn act_noop() {
+        let mut xs = vec!(1f32; SActivations::nr());
+        let expect = xs.clone();
+        SActivations::run(&[Op::Done], &[], &mut *xs);
+        assert_eq!(expect, xs);
+    }
+}