diff --git a/sbp/src/operators.rs b/sbp/src/operators.rs
index 19c3199..64127cf 100644
--- a/sbp/src/operators.rs
+++ b/sbp/src/operators.rs
@@ -171,60 +171,61 @@ pub(crate) fn diff_op_1d(
 
 #[inline(always)]
 pub(crate) fn diff_op_col(
-    block: &[&[Float]],
-    diag: &[Float],
+    block: &'static [&'static [Float]],
+    diag: &'static [Float],
     symmetric: bool,
     is_h2: bool,
-    prev: ArrayView2<Float>,
-    mut fut: ArrayViewMut2<Float>,
-) {
-    assert_eq!(prev.shape(), fut.shape());
-    let nx = prev.shape()[1];
-    assert!(nx >= 2 * block.len());
+) -> impl Fn(ArrayView2<Float>, ArrayViewMut2<Float>) {
+    #[inline(always)]
+    move |prev: ArrayView2<Float>, mut fut: ArrayViewMut2<Float>| {
+        assert_eq!(prev.shape(), fut.shape());
+        let nx = prev.shape()[1];
+        assert!(nx >= 2 * block.len());
 
-    assert_eq!(prev.strides()[0], 1);
-    assert_eq!(fut.strides()[0], 1);
+        assert_eq!(prev.strides()[0], 1);
+        assert_eq!(fut.strides()[0], 1);
 
-    let dx = if is_h2 {
-        1.0 / (nx - 2) as Float
-    } else {
-        1.0 / (nx - 1) as Float
-    };
-    let idx = 1.0 / dx;
+        let dx = if is_h2 {
+            1.0 / (nx - 2) as Float
+        } else {
+            1.0 / (nx - 1) as Float
+        };
+        let idx = 1.0 / dx;
 
-    fut.fill(0.0);
+        fut.fill(0.0);
 
-    // First block
-    for (bl, mut fut) in block.iter().zip(fut.axis_iter_mut(ndarray::Axis(1))) {
-        debug_assert_eq!(fut.len(), prev.shape()[0]);
-        for (&bl, prev) in bl.iter().zip(prev.axis_iter(ndarray::Axis(1))) {
-            debug_assert_eq!(prev.len(), fut.len());
-            fut.scaled_add(idx * bl, &prev);
-        }
-    }
-
-    let half_diag_width = (diag.len() - 1) / 2;
-
-    // Diagonal entries
-    for (ifut, mut fut) in fut
-        .axis_iter_mut(ndarray::Axis(1))
-        .enumerate()
-        .skip(block.len())
-        .take(nx - 2 * block.len())
-    {
-        for (id, d) in diag.iter().enumerate() {
-            let offset = ifut - half_diag_width + id;
-            fut.scaled_add(idx * d, &prev.slice(ndarray::s![.., offset]))
-        }
-    }
-
-    // End block
-    for (bl, mut fut) in block.iter().zip(fut.axis_iter_mut(ndarray::Axis(1)).rev()) {
-        for (&bl, prev) in bl.iter().zip(prev.axis_iter(ndarray::Axis(1)).rev()) {
-            if symmetric {
+        // First block
+        for (bl, mut fut) in block.iter().zip(fut.axis_iter_mut(ndarray::Axis(1))) {
+            debug_assert_eq!(fut.len(), prev.shape()[0]);
+            for (&bl, prev) in bl.iter().zip(prev.axis_iter(ndarray::Axis(1))) {
+                debug_assert_eq!(prev.len(), fut.len());
                 fut.scaled_add(idx * bl, &prev);
-            } else {
-                fut.scaled_add(-idx * bl, &prev);
+            }
+        }
+
+        let half_diag_width = (diag.len() - 1) / 2;
+
+        // Diagonal entries
+        for (ifut, mut fut) in fut
+            .axis_iter_mut(ndarray::Axis(1))
+            .enumerate()
+            .skip(block.len())
+            .take(nx - 2 * block.len())
+        {
+            for (id, d) in diag.iter().enumerate() {
+                let offset = ifut - half_diag_width + id;
+                fut.scaled_add(idx * d, &prev.slice(ndarray::s![.., offset]))
+            }
+        }
+
+        // End block
+        for (bl, mut fut) in block.iter().zip(fut.axis_iter_mut(ndarray::Axis(1)).rev()) {
+            for (&bl, prev) in bl.iter().zip(prev.axis_iter(ndarray::Axis(1)).rev()) {
+                if symmetric {
+                    fut.scaled_add(idx * bl, &prev);
+                } else {
+                    fut.scaled_add(-idx * bl, &prev);
+                }
             }
         }
     }
diff --git a/sbp/src/operators/traditional4.rs b/sbp/src/operators/traditional4.rs
index e0ff86d..1a26ae5 100644
--- a/sbp/src/operators/traditional4.rs
+++ b/sbp/src/operators/traditional4.rs
@@ -43,7 +43,7 @@ impl<SBP: SbpOperator1d> SbpOperator2d for (&SBP, &SBP4) {
                 diff_op_row(SBP4::BLOCK, SBP4::DIAG, false, false)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(SBP4::BLOCK, SBP4::DIAG, false, false, prev, fut);
+                diff_op_col(SBP4::BLOCK, SBP4::DIAG, false, false)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
diff --git a/sbp/src/operators/traditional8.rs b/sbp/src/operators/traditional8.rs
index d288255..7d34931 100644
--- a/sbp/src/operators/traditional8.rs
+++ b/sbp/src/operators/traditional8.rs
@@ -47,7 +47,7 @@ impl<SBP: SbpOperator1d> SbpOperator2d for (&SBP, &SBP8) {
                 diff_op_row(SBP8::BLOCK, SBP8::DIAG, false, false)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(SBP8::BLOCK, SBP8::DIAG, false, false, prev, fut);
+                diff_op_col(SBP8::BLOCK, SBP8::DIAG, false, false)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
diff --git a/sbp/src/operators/upwind4h2.rs b/sbp/src/operators/upwind4h2.rs
index d507799..06aa12f 100644
--- a/sbp/src/operators/upwind4h2.rs
+++ b/sbp/src/operators/upwind4h2.rs
@@ -61,7 +61,7 @@ impl<SBP: SbpOperator1d> SbpOperator2d for (&SBP, &Upwind4h2) {
                 diff_op_row(Upwind4h2::BLOCK, Upwind4h2::DIAG, false, true)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(Upwind4h2::BLOCK, Upwind4h2::DIAG, false, true, prev, fut);
+                diff_op_col(Upwind4h2::BLOCK, Upwind4h2::DIAG, false, true)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
@@ -84,14 +84,7 @@ impl<UO: UpwindOperator1d> UpwindOperator2d for (&UO, &Upwind4h2) {
                 diff_op_row(Upwind4h2::DISS_BLOCK, Upwind4h2::DISS_DIAG, true, true)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(
-                    Upwind4h2::DISS_BLOCK,
-                    Upwind4h2::DISS_DIAG,
-                    true,
-                    true,
-                    prev,
-                    fut,
-                );
+                diff_op_col(Upwind4h2::DISS_BLOCK, Upwind4h2::DISS_DIAG, true, true)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
diff --git a/sbp/src/operators/upwind9.rs b/sbp/src/operators/upwind9.rs
index 2aab4e6..484b316 100644
--- a/sbp/src/operators/upwind9.rs
+++ b/sbp/src/operators/upwind9.rs
@@ -66,7 +66,7 @@ impl<SBP: SbpOperator1d> SbpOperator2d for (&SBP, &Upwind9) {
                 diff_op_row(Upwind9::BLOCK, Upwind9::DIAG, false, false)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(Upwind9::BLOCK, Upwind9::DIAG, false, false, prev, fut);
+                diff_op_col(Upwind9::BLOCK, Upwind9::DIAG, false, false)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
@@ -99,14 +99,7 @@ impl<UO: UpwindOperator1d> UpwindOperator2d for (&UO, &Upwind9) {
                 diff_op_row(Upwind9::DISS_BLOCK, Upwind9::DISS_DIAG, true, false)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(
-                    Upwind9::DISS_BLOCK,
-                    Upwind9::DISS_DIAG,
-                    true,
-                    false,
-                    prev,
-                    fut,
-                );
+                diff_op_col(Upwind9::DISS_BLOCK, Upwind9::DISS_DIAG, true, false)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
diff --git a/sbp/src/operators/upwind9h2.rs b/sbp/src/operators/upwind9h2.rs
index 1b0e2e4..c4ebd42 100644
--- a/sbp/src/operators/upwind9h2.rs
+++ b/sbp/src/operators/upwind9h2.rs
@@ -69,7 +69,7 @@ impl<SBP: SbpOperator1d> SbpOperator2d for (&SBP, &Upwind9h2) {
                 diff_op_row(Upwind9h2::BLOCK, Upwind9h2::DIAG, false, true)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(Upwind9h2::BLOCK, Upwind9h2::DIAG, false, true, prev, fut);
+                diff_op_col(Upwind9h2::BLOCK, Upwind9h2::DIAG, false, true)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row
@@ -126,14 +126,7 @@ impl<UO: UpwindOperator1d> UpwindOperator2d for (&UO, &Upwind9h2) {
                 diff_op_row(Upwind9h2::DISS_BLOCK, Upwind9h2::DISS_DIAG, true, true)(prev, fut);
             }
             ([1, _], [1, _]) => {
-                diff_op_col(
-                    Upwind9h2::DISS_BLOCK,
-                    Upwind9h2::DISS_DIAG,
-                    true,
-                    true,
-                    prev,
-                    fut,
-                );
+                diff_op_col(Upwind9h2::DISS_BLOCK, Upwind9h2::DISS_DIAG, true, true)(prev, fut);
             }
             ([_, _], [_, _]) => {
                 // Fallback, work row by row