feat(acir): Set dynamic array values

compiler/noirc_evaluator/src/ssa/acir_gen/mod.rs

@@ -766,6 +766,36 @@
 
                 Ok(AcirValue::Array(elements))
             }
+            (
+                AcirValue::DynamicArray(AcirDynamicArray { block_id, len, .. }),
+                AcirValue::Array(dummy_values),
+            ) => {
+                let dummy_values = dummy_values
+                    .into_iter()
+                    .flat_map(|val| val.clone().flatten())
+                    .map(|(var, typ)| AcirValue::Var(var, typ))
+                    .collect::<Vec<_>>();
+
+                assert_eq!(
+                    *len,
+                    dummy_values.len(),
+                    "ICE: The store value and dummy must have the same number of inner values"
+                );
+
+                let values = try_vecmap(0..*len, |i| {
+                    let index_var = self.acir_context.add_constant(FieldElement::from(i as u128));
+
+                    let read = self.acir_context.read_from_memory(*block_id, &index_var)?;
+                    Ok::<AcirValue, RuntimeError>(AcirValue::Var(read, AcirType::field()))
+                })?;
+
+                let mut elements = im::Vector::new();
+                for (val, dummy_val) in values.iter().zip(dummy_values) {
+                    elements.push_back(self.convert_array_set_store_value(val, &dummy_val)?);
+                }
+
+                Ok(AcirValue::Array(elements))
+            }
             (AcirValue::DynamicArray(_), AcirValue::DynamicArray(_)) => {
                 unimplemented!("ICE: setting a dynamic array not supported");
             }
@@ -806,7 +836,7 @@
                 // Read the value from the array at the specified index
                 let read = self.acir_context.read_from_memory(block_id, var_index)?;
 
                 // Incremement the var_index in case of a nested array
                 *var_index = self.acir_context.add_var(*var_index, one)?;
 
                 let typ = AcirType::NumericType(numeric_type);
@@ -917,7 +947,7 @@
             AcirValue::Var(store_var, _) => {
                 // Write the new value into the new array at the specified index
                 self.acir_context.write_to_memory(block_id, var_index, &store_var)?;
                 // Incremement the var_index in case of a nested array
                 *var_index = self.acir_context.add_var(*var_index, one)?;
             }
             AcirValue::Array(values) => {
@@ -925,8 +955,14 @@
                     self.array_set_value(value, block_id, var_index)?;
                 }
             }
-            AcirValue::DynamicArray(_) => {
-                unimplemented!("ICE: setting a dynamic array not supported");
+            AcirValue::DynamicArray(AcirDynamicArray { block_id: inner_block_id, len, .. }) => {
+                let values = try_vecmap(0..len, |i| {
+                    let index_var = self.acir_context.add_constant(FieldElement::from(i as u128));
+
+                    let read = self.acir_context.read_from_memory(inner_block_id, &index_var)?;
+                    Ok::<AcirValue, RuntimeError>(AcirValue::Var(read, AcirType::field()))
+                })?;
+                self.array_set_value(AcirValue::Array(values.into()), block_id, var_index)?;
             }
         }
         Ok(())
@@ -951,7 +987,7 @@
         if !already_initialized {
             let value = &dfg[array_id];
             match value {
-                Value::Array { .. } => {
+                Value::Array { .. } | Value::Instruction { .. } => {
                     let value = self.convert_value(array_id, dfg);
                     let len = if matches!(array_typ, Type::Array(_, _)) {
                         array_typ.flattened_size()
@@ -965,7 +1001,7 @@
                         message: format!("Array {array_id} should be initialized"),
                         call_stack: self.acir_context.get_call_stack(),
                     }
-                    .into())
+                    .into());
                 }
             }
         }

tooling/nargo_cli/tests/execution_success/nested_array_dynamic/src/main.nr

@@ -8,6 +8,11 @@ struct Foo {
     bar: Bar,
 }
 
+struct FooParent {
+    array: [Field; 3],
+    foos: [Foo; 4],
+}
+
 fn main(mut x : [Foo; 4], y : pub Field) {
     assert(x[y - 3].a == 1);
     assert(x[y - 3].b == [2, 3, 20]);
@@ -38,5 +43,37 @@ fn main(mut x : [Foo; 4], y : pub Field) {
     assert(x[y - 2].bar.inner == [103, 104, 105]);
     assert(x[y - 1].bar.inner == [106, 107, 108]);
     assert(x[y].bar.inner == [109, 110, 111]);
+
+    let foo_parent_one = FooParent { array: [0, 1, 2], foos: x };
+    let foo_parent_two = FooParent { array: [3, 4, 5], foos: x };
+    let mut foo_parents = [foo_parent_one, foo_parent_two];
+
+    assert(foo_parents[y - 3].foos[y - 3].b == [2, 3, 20]);
+    assert(foo_parents[y - 3].foos[y - 2].b == [5, 6, 21]);
+    assert(foo_parents[y - 3].foos[y - 1].b == [100, 101, 102]);
+    assert(foo_parents[y - 3].foos[y].b == [11, 12, 23]);
+
+    assert(foo_parents[y - 3].foos[y].a == 50);
+
+    assert(foo_parents[1].foos[1].b == [5, 6, 21]);
+    if y == 2 {
+        foo_parents[y - 2].foos[y - 2].b = [10, 9, 8];
+    } else {
+        foo_parents[y - 2].foos[y - 2].b = [20, 19, 18];
+    }
+    assert(foo_parents[1].foos[1].b == [20, 19, 18]);
+
+    assert(foo_parents[1].foos[1].b[2] == 18);
+    if y == 3 {
+        foo_parents[y - 2].foos[y - 2].b[y - 1] = 5000;
+    } else {
+        foo_parents[y - 2].foos[y - 2].b[y - 1] = 1000;
+    }
+    assert(foo_parents[1].foos[1].b[2] == 5000);
+
+    // Set a dynamic array value
+    foo_parents[y - 2].foos[y - 3].b = foo_parents[y - 2].foos[y - 2].b;
+    assert(foo_parents[1].foos[0].b == [20, 19, 5000]);
+
 }