diff --git a/tools/test/p4src/p4-16/default.p4 b/tools/test/p4src/p4-16/default.p4
index ac4dd46..93683a5 100644
--- a/tools/test/p4src/p4-16/default.p4
+++ b/tools/test/p4src/p4-16/default.p4
@@ -58,10 +58,10 @@
             set_egress_port(standard_metadata);
             send_to_cpu(standard_metadata);
             do_ecmp();
-            drop(standard_metadata);
+            _drop(standard_metadata);
         }
         counters = table0_counter;
-        default_action = drop(standard_metadata);
+        default_action = _drop(standard_metadata);
     }
 
     action_selector(HashAlgorithm.crc16, 32w64, 32w16) ecmp_selector;
diff --git a/tools/test/p4src/p4-16/ecmp.p4 b/tools/test/p4src/p4-16/ecmp.p4
index 7e2010d..7146cd2 100644
--- a/tools/test/p4src/p4-16/ecmp.p4
+++ b/tools/test/p4src/p4-16/ecmp.p4
@@ -20,7 +20,13 @@
 #include "include/headers.p4"
 
 typedef bit<16> group_id_t;
-typedef bit<8> group_size_t;
+
+/*
+    Expected number of ports of an ECMP group.
+    This value is fixed, .i.e. we do not support ECMP over port groups of different size.
+    Due to hardware limitations, this value must be constant and a power of 2.
+*/
+#define ECMP_GROUP_SIZE 128w2
 
 struct ecmp_metadata_t {
     group_id_t group_id;
@@ -44,12 +50,11 @@
     direct_counter(CounterType.packets) ecmp_group_table_counter;
     direct_counter(CounterType.packets) table0_counter;
 
-    action ecmp_group(group_id_t group_id, group_size_t groupSize) {
+    action ecmp_group(group_id_t group_id) {
         meta.ecmp_metadata.group_id = group_id;
-        hash(meta.ecmp_metadata.selector, HashAlgorithm.crc16, (bit<64>)0,
+        hash(meta.ecmp_metadata.selector, HashAlgorithm.crc32, (bit<64>)0,
         { hdr.ipv4.srcAddr, hdr.ipv4.dstAddr, hdr.ipv4.protocol, hdr.tcp.srcPort, hdr.tcp.dstPort, hdr.udp.srcPort,
-            hdr.udp.dstPort },
-        (bit<128>)groupSize);
+            hdr.udp.dstPort }, ECMP_GROUP_SIZE);
     }
 
     table ecmp_group_table {
@@ -69,7 +74,7 @@
             ecmp_group;
             set_egress_port(standard_metadata);
             send_to_cpu(standard_metadata);
-            drop(standard_metadata);
+            _drop(standard_metadata);
         }
         key = {
             standard_metadata.ingress_port: ternary;
@@ -78,6 +83,7 @@
             hdr.ethernet.etherType        : ternary;
         }
         counters = table0_counter;
+        default_action = _drop(standard_metadata);
     }
 
     PortCountersControl() port_counters_control;
diff --git a/tools/test/p4src/p4-16/include/actions.p4 b/tools/test/p4src/p4-16/include/actions.p4
index c9f2dec..0b87ef3 100644
--- a/tools/test/p4src/p4-16/include/actions.p4
+++ b/tools/test/p4src/p4-16/include/actions.p4
@@ -27,7 +27,7 @@
     standard_metadata.egress_spec = port;
 }
 
-action drop(inout standard_metadata_t standard_metadata) {
+action _drop(inout standard_metadata_t standard_metadata) {
     standard_metadata.egress_spec = DROP_PORT;
 }
 
diff --git a/tools/test/p4src/p4-16/p4c-out/default.json b/tools/test/p4src/p4-16/p4c-out/default.json
index e985a78..2dd5c49 100644
--- a/tools/test/p4src/p4-16/p4c-out/default.json
+++ b/tools/test/p4src/p4-16/p4c-out/default.json
@@ -231,12 +231,12 @@
   "header_union_stacks" : [],
   "field_lists" : [],
   "errors" : [
-    ["NoError", 0],
-    ["PacketTooShort", 1],
-    ["NoMatch", 2],
-    ["StackOutOfBounds", 3],
-    ["HeaderTooShort", 4],
-    ["ParserTimeout", 5]
+    ["NoError", 1],
+    ["PacketTooShort", 2],
+    ["NoMatch", 3],
+    ["StackOutOfBounds", 4],
+    ["HeaderTooShort", 5],
+    ["ParserTimeout", 6]
   ],
   "enums" : [],
   "parsers" : [
@@ -2494,7 +2494,7 @@
       ]
     },
     {
-      "name" : "drop",
+      "name" : "_drop",
       "id" : 3,
       "runtime_data" : [],
       "primitives" : [
@@ -2513,7 +2513,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2532,7 +2532,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2551,7 +2551,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2570,7 +2570,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2589,7 +2589,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2608,7 +2608,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2627,7 +2627,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2646,7 +2646,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2665,7 +2665,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2684,7 +2684,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2703,7 +2703,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2722,7 +2722,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2741,7 +2741,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2760,7 +2760,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2779,7 +2779,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2798,7 +2798,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2817,7 +2817,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2855,7 +2855,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2874,7 +2874,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2893,7 +2893,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2912,7 +2912,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2931,7 +2931,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2950,7 +2950,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2969,7 +2969,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2988,7 +2988,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3007,7 +3007,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3026,7 +3026,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3045,7 +3045,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3064,7 +3064,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3083,7 +3083,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3102,7 +3102,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3121,7 +3121,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3140,7 +3140,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3159,7 +3159,7 @@
           "source_info" : {
             "filename" : "include/actions.p4",
             "line" : 30,
-            "column" : 38,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         }
@@ -3461,13 +3461,13 @@
           "support_timeout" : false,
           "direct_meters" : null,
           "action_ids" : [0, 2, 5, 3],
-          "actions" : ["set_egress_port", "send_to_cpu", "do_ecmp", "drop"],
+          "actions" : ["set_egress_port", "send_to_cpu", "do_ecmp", "_drop"],
           "base_default_next" : "node_7",
           "next_tables" : {
             "do_ecmp" : "ecmp",
             "set_egress_port" : "node_7",
             "send_to_cpu" : "node_7",
-            "drop" : "node_7"
+            "_drop" : "node_7"
           },
           "default_entry" : {
             "action_id" : 3,
diff --git a/tools/test/p4src/p4-16/p4c-out/default.p4info b/tools/test/p4src/p4-16/p4c-out/default.p4info
index 55a9d2e..6bf4a27 100644
--- a/tools/test/p4src/p4-16/p4c-out/default.p4info
+++ b/tools/test/p4src/p4-16/p4c-out/default.p4info
@@ -38,7 +38,7 @@
     id: 16824896
   }
   action_refs {
-    id: 16793508
+    id: 16784184
   }
   direct_resource_ids: 301990488
   size: 1024
@@ -87,9 +87,9 @@
 }
 actions {
   preamble {
-    id: 16793508
-    name: "drop"
-    alias: "drop"
+    id: 16784184
+    name: "_drop"
+    alias: "_drop"
   }
 }
 actions {
diff --git a/tools/test/p4src/p4-16/p4c-out/ecmp.json b/tools/test/p4src/p4-16/p4c-out/ecmp.json
index c416184..506db53 100644
--- a/tools/test/p4src/p4-16/p4c-out/ecmp.json
+++ b/tools/test/p4src/p4-16/p4c-out/ecmp.json
@@ -9,9 +9,8 @@
       "name" : "scalars_0",
       "id" : 0,
       "fields" : [
-        ["tmp", 128, false],
-        ["tmp_0", 32, false],
-        ["tmp_1", 32, false]
+        ["tmp", 32, false],
+        ["tmp_0", 32, false]
       ]
     },
     {
@@ -419,7 +418,7 @@
       "id" : 0,
       "source_info" : {
         "filename" : "include/parsers.p4",
-        "line" : 48,
+        "line" : 64,
         "column" : 8,
         "source_fragment" : "DeparserImpl"
       },
@@ -445,7 +444,7 @@
       "id" : 2,
       "source_info" : {
         "filename" : "include/port_counters.p4",
-        "line" : 6,
+        "line" : 22,
         "column" : 38,
         "source_fragment" : "egress_port_counter"
       },
@@ -457,7 +456,7 @@
       "id" : 3,
       "source_info" : {
         "filename" : "include/port_counters.p4",
-        "line" : 7,
+        "line" : 23,
         "column" : 38,
         "source_fragment" : "ingress_port_counter"
       },
@@ -470,7 +469,7 @@
     {
       "name" : "calc",
       "id" : 0,
-      "algo" : "crc16",
+      "algo" : "crc32",
       "input" : [
         {
           "type" : "field",
@@ -529,7 +528,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -548,7 +547,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -567,7 +566,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -586,7 +585,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -605,7 +604,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -624,7 +623,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -643,7 +642,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -662,7 +661,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -681,7 +680,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -700,7 +699,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -719,7 +718,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -738,7 +737,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -757,7 +756,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -776,7 +775,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -795,7 +794,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -814,7 +813,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -833,7 +832,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -852,7 +851,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 11,
+            "line" : 27,
             "column" : 4,
             "source_fragment" : "standard_metadata.egress_spec = port"
           }
@@ -871,7 +870,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -890,7 +889,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -909,7 +908,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -928,7 +927,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -947,7 +946,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -966,7 +965,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 49,
             "source_fragment" : "standard_metadata, port_t port) { ..."
           }
@@ -985,7 +984,7 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
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             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2619,8 +2612,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2638,8 +2631,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2657,8 +2650,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2676,8 +2669,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2695,8 +2688,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2714,8 +2707,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2733,8 +2726,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2752,8 +2745,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2771,8 +2764,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2790,8 +2783,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2809,8 +2802,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2828,8 +2821,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2847,8 +2840,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2866,8 +2859,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2885,7 +2878,7 @@
           ],
           "source_info" : {
             "filename" : "include/defines.p4",
-            "line" : 13,
+            "line" : 30,
             "column" : 25,
             "source_fragment" : "511; ..."
           }
@@ -2904,8 +2897,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2923,8 +2916,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2942,8 +2935,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2961,8 +2954,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2980,8 +2973,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -2999,8 +2992,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3018,8 +3011,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3037,8 +3030,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3056,8 +3049,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3075,8 +3068,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3094,8 +3087,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3113,8 +3106,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3132,8 +3125,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3151,8 +3144,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3170,8 +3163,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3189,8 +3182,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         },
@@ -3208,8 +3201,8 @@
           ],
           "source_info" : {
             "filename" : "include/actions.p4",
-            "line" : 14,
-            "column" : 38,
+            "line" : 30,
+            "column" : 39,
             "source_fragment" : "standard_metadata) { ..."
           }
         }
@@ -3217,15 +3210,11 @@
     },
     {
       "name" : "ecmp_group",
-      "id" : 6,
+      "id" : 5,
       "runtime_data" : [
         {
           "name" : "group_id",
           "bitwidth" : 16
-        },
-        {
-          "name" : "groupSize",
-          "bitwidth" : 8
         }
       ],
       "primitives" : [
@@ -3243,38 +3232,12 @@
           ],
           "source_info" : {
             "filename" : "ecmp.p4",
-            "line" : 32,
+            "line" : 54,
             "column" : 8,
             "source_fragment" : "meta.ecmp_metadata.group_id = group_id"
           }
         },
         {
-          "op" : "assign",
-          "parameters" : [
-            {
-              "type" : "field",
-              "value" : ["scalars", "tmp"]
-            },
-            {
-              "type" : "expression",
-              "value" : {
-                "type" : "expression",
-                "value" : {
-                  "op" : "&",
-                  "left" : {
-                    "type" : "local",
-                    "value" : 1
-                  },
-                  "right" : {
-                    "type" : "hexstr",
-                    "value" : "0xffffffffffffffffffffffffffffffff"
-                  }
-                }
-              }
-            }
-          ]
-        },
-        {
           "op" : "modify_field_with_hash_based_offset",
           "parameters" : [
             {
@@ -3290,22 +3253,22 @@
               "value" : "calc"
             },
             {
-              "type" : "field",
-              "value" : ["scalars", "tmp"]
+              "type" : "hexstr",
+              "value" : "0x00000000000000000000000000000002"
             }
           ],
           "source_info" : {
             "filename" : "ecmp.p4",
-            "line" : 33,
+            "line" : 55,
             "column" : 8,
-            "source_fragment" : "hash(meta.ecmp_metadata.selector, HashAlgorithm.crc16, (bit<64>)0, ..."
+            "source_fragment" : "hash(meta.ecmp_metadata.selector, HashAlgorithm.crc32, (bit<64>)0, ..."
           }
         }
       ]
     },
     {
       "name" : "act",
-      "id" : 7,
+      "id" : 6,
       "runtime_data" : [],
       "primitives" : [
         {
@@ -3331,7 +3294,7 @@
     },
     {
       "name" : "act_0",
-      "id" : 8,
+      "id" : 7,
       "runtime_data" : [],
       "primitives" : [
         {
@@ -3339,7 +3302,7 @@
           "parameters" : [
             {
               "type" : "field",
-              "value" : ["scalars", "tmp_0"]
+              "value" : ["scalars", "tmp"]
             },
             {
               "type" : "expression",
@@ -3369,12 +3332,12 @@
             },
             {
               "type" : "field",
-              "value" : ["scalars", "tmp_0"]
+              "value" : ["scalars", "tmp"]
             }
           ],
           "source_info" : {
             "filename" : "include/port_counters.p4",
-            "line" : 11,
+            "line" : 27,
             "column" : 12,
             "source_fragment" : "ingress_port_counter.count((bit<32>)standard_metadata.ingress_port)"
           }
@@ -3384,7 +3347,7 @@
           "parameters" : [
             {
               "type" : "field",
-              "value" : ["scalars", "tmp_1"]
+              "value" : ["scalars", "tmp_0"]
             },
             {
               "type" : "expression",
@@ -3414,12 +3377,12 @@
             },
             {
               "type" : "field",
-              "value" : ["scalars", "tmp_1"]
+              "value" : ["scalars", "tmp_0"]
             }
           ],
           "source_info" : {
             "filename" : "include/port_counters.p4",
-            "line" : 12,
+            "line" : 28,
             "column" : 12,
             "source_fragment" : "egress_port_counter.count((bit<32>)standard_metadata.egress_spec)"
           }
@@ -3428,7 +3391,7 @@
     },
     {
       "name" : "act_1",
-      "id" : 9,
+      "id" : 8,
       "runtime_data" : [],
       "primitives" : [
         {
@@ -3469,7 +3432,7 @@
     },
     {
       "name" : "act_2",
-      "id" : 10,
+      "id" : 9,
       "runtime_data" : [],
       "primitives" : [
         {
@@ -3496,7 +3459,7 @@
       "id" : 0,
       "source_info" : {
         "filename" : "ecmp.p4",
-        "line" : 26,
+        "line" : 48,
         "column" : 8,
         "source_fragment" : "ingress"
       },
@@ -3512,14 +3475,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [7],
+          "action_ids" : [6],
           "actions" : ["act"],
           "base_default_next" : "node_4",
           "next_tables" : {
             "act" : "node_4"
           },
           "default_entry" : {
-            "action_id" : 7,
+            "action_id" : 6,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
@@ -3530,7 +3493,7 @@
           "id" : 1,
           "source_info" : {
             "filename" : "ecmp.p4",
-            "line" : 50,
+            "line" : 71,
             "column" : 10,
             "source_fragment" : "table0"
           },
@@ -3561,18 +3524,17 @@
           "max_size" : 1024,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [6, 1, 4, 5, 3],
-          "actions" : ["ecmp_group", "set_egress_port", "send_to_cpu", "drop", "NoAction"],
+          "action_ids" : [5, 1, 3, 4],
+          "actions" : ["ecmp_group", "set_egress_port", "send_to_cpu", "_drop"],
           "base_default_next" : "node_7",
           "next_tables" : {
             "ecmp_group" : "ecmp_group_table",
             "set_egress_port" : "node_7",
             "send_to_cpu" : "node_7",
-            "drop" : "node_7",
-            "NoAction" : "node_7"
+            "_drop" : "node_7"
           },
           "default_entry" : {
-            "action_id" : 3,
+            "action_id" : 4,
             "action_const" : false,
             "action_data" : [],
             "action_entry_const" : false
@@ -3583,7 +3545,7 @@
           "id" : 2,
           "source_info" : {
             "filename" : "ecmp.p4",
-            "line" : 39,
+            "line" : 60,
             "column" : 10,
             "source_fragment" : "ecmp_group_table"
           },
@@ -3628,14 +3590,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [8],
+          "action_ids" : [7],
           "actions" : ["act_0"],
           "base_default_next" : null,
           "next_tables" : {
             "act_0" : null
           },
           "default_entry" : {
-            "action_id" : 8,
+            "action_id" : 7,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
@@ -3675,7 +3637,7 @@
           "id" : 1,
           "source_info" : {
             "filename" : "ecmp.p4",
-            "line" : 72,
+            "line" : 94,
             "column" : 13,
             "source_fragment" : "hdr.packet_out.isValid()"
           },
@@ -3701,7 +3663,7 @@
           "id" : 2,
           "source_info" : {
             "filename" : "include/port_counters.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 12,
             "source_fragment" : "standard_metadata.egress_spec < 254"
           },
@@ -3729,7 +3691,7 @@
       "id" : 1,
       "source_info" : {
         "filename" : "ecmp.p4",
-        "line" : 83,
+        "line" : 105,
         "column" : 8,
         "source_fragment" : "egress"
       },
@@ -3745,14 +3707,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [10],
+          "action_ids" : [9],
           "actions" : ["act_2"],
           "base_default_next" : "node_12",
           "next_tables" : {
             "act_2" : "node_12"
           },
           "default_entry" : {
-            "action_id" : 10,
+            "action_id" : 9,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
@@ -3768,14 +3730,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [9],
+          "action_ids" : [8],
           "actions" : ["act_1"],
           "base_default_next" : null,
           "next_tables" : {
             "act_1" : null
           },
           "default_entry" : {
-            "action_id" : 9,
+            "action_id" : 8,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
diff --git a/tools/test/p4src/p4-16/p4c-out/ecmp.p4info b/tools/test/p4src/p4-16/p4c-out/ecmp.p4info
index bfa727d..29fd5c0 100644
--- a/tools/test/p4src/p4-16/p4c-out/ecmp.p4info
+++ b/tools/test/p4src/p4-16/p4c-out/ecmp.p4info
@@ -66,11 +66,7 @@
     id: 16829080
   }
   action_refs {
-    id: 16793508
-  }
-  action_refs {
-    id: 16800567
-    annotations: "@defaultonly()"
+    id: 16784184
   }
   direct_resource_ids: 301990488
   size: 1024
@@ -104,9 +100,9 @@
 }
 actions {
   preamble {
-    id: 16793508
-    name: "drop"
-    alias: "drop"
+    id: 16784184
+    name: "_drop"
+    alias: "_drop"
   }
 }
 actions {
@@ -120,11 +116,6 @@
     name: "group_id"
     bitwidth: 16
   }
-  params {
-    id: 2
-    name: "groupSize"
-    bitwidth: 8
-  }
 }
 counters {
   preamble {
diff --git a/tools/test/p4src/p4-16/p4c-out/empty.json b/tools/test/p4src/p4-16/p4c-out/empty.json
index d308780..8da30fa 100644
--- a/tools/test/p4src/p4-16/p4c-out/empty.json
+++ b/tools/test/p4src/p4-16/p4c-out/empty.json
@@ -107,7 +107,7 @@
       "id" : 0,
       "source_info" : {
         "filename" : "empty.p4",
-        "line" : 44,
+        "line" : 60,
         "column" : 8,
         "source_fragment" : "DeparserImpl"
       },
@@ -145,7 +145,7 @@
           ],
           "source_info" : {
             "filename" : "empty.p4",
-            "line" : 23,
+            "line" : 39,
             "column" : 8,
             "source_fragment" : "meta.dummy_metadata.dummyField = 8w1"
           }
@@ -159,7 +159,7 @@
       "id" : 0,
       "source_info" : {
         "filename" : "empty.p4",
-        "line" : 21,
+        "line" : 37,
         "column" : 8,
         "source_fragment" : "ingress"
       },
@@ -170,7 +170,7 @@
           "id" : 0,
           "source_info" : {
             "filename" : "empty.p4",
-            "line" : 25,
+            "line" : 41,
             "column" : 10,
             "source_fragment" : "table0"
           },
@@ -210,7 +210,7 @@
       "id" : 1,
       "source_info" : {
         "filename" : "empty.p4",
-        "line" : 38,
+        "line" : 54,
         "column" : 8,
         "source_fragment" : "egress"
       },
diff --git a/tools/test/p4src/p4-16/p4c-out/wcmp.json b/tools/test/p4src/p4-16/p4c-out/wcmp.json
index 6e57c49..dc50c96 100644
--- a/tools/test/p4src/p4-16/p4c-out/wcmp.json
+++ b/tools/test/p4src/p4-16/p4c-out/wcmp.json
@@ -393,7 +393,7 @@
           "parser_ops" : [],
           "transitions" : [
             {
-              "value" : "0x00ff",
+              "value" : "0xff",
               "mask" : null,
               "next_state" : "parse_packet_out"
             },
@@ -419,7 +419,7 @@
       "id" : 0,
       "source_info" : {
         "filename" : "include/parsers.p4",
-        "line" : 48,
+        "line" : 64,
         "column" : 8,
         "source_fragment" : "DeparserImpl"
       },
@@ -445,7 +445,7 @@
       "id" : 2,
       "source_info" : {
         "filename" : "include/port_counters.p4",
-        "line" : 6,
+        "line" : 22,
         "column" : 38,
         "source_fragment" : "egress_port_counter"
       },
@@ -457,7 +457,7 @@
       "id" : 3,
       "source_info" : {
         "filename" : "include/port_counters.p4",
-        "line" : 7,
+        "line" : 23,
         "column" : 38,
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           "id" : 1,
           "source_info" : {
             "filename" : "wcmp.p4",
-            "line" : 78,
+            "line" : 95,
             "column" : 13,
             "source_fragment" : "hdr.packet_out.isValid()"
           },
@@ -3803,7 +3796,7 @@
           "id" : 2,
           "source_info" : {
             "filename" : "include/port_counters.p4",
-            "line" : 10,
+            "line" : 26,
             "column" : 12,
             "source_fragment" : "standard_metadata.egress_spec < 254"
           },
@@ -3831,7 +3824,7 @@
       "id" : 1,
       "source_info" : {
         "filename" : "wcmp.p4",
-        "line" : 90,
+        "line" : 107,
         "column" : 8,
         "source_fragment" : "egress"
       },
@@ -3847,14 +3840,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [11],
+          "action_ids" : [10],
           "actions" : ["act_2"],
           "base_default_next" : "node_13",
           "next_tables" : {
             "act_2" : "node_13"
           },
           "default_entry" : {
-            "action_id" : 11,
+            "action_id" : 10,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
@@ -3870,14 +3863,14 @@
           "with_counters" : false,
           "support_timeout" : false,
           "direct_meters" : null,
-          "action_ids" : [10],
+          "action_ids" : [9],
           "actions" : ["act_1"],
           "base_default_next" : null,
           "next_tables" : {
             "act_1" : null
           },
           "default_entry" : {
-            "action_id" : 10,
+            "action_id" : 9,
             "action_const" : true,
             "action_data" : [],
             "action_entry_const" : true
diff --git a/tools/test/p4src/p4-16/p4c-out/wcmp.p4info b/tools/test/p4src/p4-16/p4c-out/wcmp.p4info
index 8846b67..41aabf4 100644
--- a/tools/test/p4src/p4-16/p4c-out/wcmp.p4info
+++ b/tools/test/p4src/p4-16/p4c-out/wcmp.p4info
@@ -38,11 +38,7 @@
     id: 16829080
   }
   action_refs {
-    id: 16793508
-  }
-  action_refs {
-    id: 16800567
-    annotations: "@defaultonly()"
+    id: 16784184
   }
   direct_resource_ids: 301990488
   size: 1024
@@ -97,9 +93,9 @@
 }
 actions {
   preamble {
-    id: 16793508
-    name: "drop"
-    alias: "drop"
+    id: 16784184
+    name: "_drop"
+    alias: "_drop"
   }
 }
 actions {
diff --git a/tools/test/p4src/p4-16/wcmp.p4 b/tools/test/p4src/p4-16/wcmp.p4
index 419ba83..8123bfb 100644
--- a/tools/test/p4src/p4-16/wcmp.p4
+++ b/tools/test/p4src/p4-16/wcmp.p4
@@ -64,7 +64,7 @@
             set_egress_port(standard_metadata);
             wcmp_group;
             send_to_cpu(standard_metadata);
-            drop(standard_metadata);
+            _drop(standard_metadata);
         }
         key = {
             standard_metadata.ingress_port: ternary;
@@ -73,6 +73,7 @@
             hdr.ethernet.etherType        : ternary;
         }
         counters = table0_counter;
+        default_action = _drop(standard_metadata);
     }
 
     table wcmp_group_table {