treewide: Add reduction_opcode_width configuration parameter

Author: colluca

sw/snRuntime/api/sync_decls.h

@@ -6,6 +6,9 @@
 
 #include <stdint.h>
 
+#define SNRT_COLLECTIVE_MASK_WIDTH \
+    (64 - SNRT_REDUCTION_OPCODE_WIDTH - SNRT_COLLECTIVE_OPCODE_WIDTH)
+
 typedef struct {
     uint32_t volatile cnt;
     uint32_t volatile iteration;
@@ -35,9 +38,10 @@ typedef enum {
 
 typedef union {
     struct __attribute__((__packed__)) {
-        snrt_reduction_opcode_t reduction_opcode : SNRT_COLLECTIVE_WIDTH;
-        snrt_collective_opcode_t collective_opcode : 2;
-        uint64_t mask : (64 - SNRT_COLLECTIVE_WIDTH - 2);
+        snrt_reduction_opcode_t reduction_opcode : SNRT_REDUCTION_OPCODE_WIDTH;
+        snrt_collective_opcode_t collective_opcode
+            : SNRT_COLLECTIVE_OPCODE_WIDTH;
+        uint64_t mask : SNRT_COLLECTIVE_MASK_WIDTH;
     } f;
     uint64_t w;
 } snrt_collective_op_t;

target/snitch_cluster/sw/runtime/common/snitch_cluster_cfg.h.tpl

@@ -26,7 +26,8 @@
 #define SNRT_SUPPORTS_NARROW_REDUCTION
 % endif
 
-#define SNRT_COLLECTIVE_WIDTH ${cfg['cluster']['collective_width']}
+#define SNRT_REDUCTION_OPCODE_WIDTH ${cfg['cluster']['reduction_opcode_width']}
+#define SNRT_COLLECTIVE_OPCODE_WIDTH ${cfg['cluster']['collective_width'] - cfg['cluster']['reduction_opcode_width']}
 
 // Software configuration
 #define SNRT_LOG2_STACK_SIZE 10

util/clustergen/schema/snitch_cluster.schema.json

@@ -166,9 +166,14 @@
                     "description": "Width of the cluster's atomic ID.",
                     "default": 1
                 },  
+                "reduction_opcode_width": {
+                    "type": "number",
+                    "description": "Width of the reduction opcode field.",
+                    "default": 4
+                },  
                 "collective_width": {
                     "type": "number",
-                    "description": "Width of the collective operation field.",
+                    "description": "Width of the collective operation information in the awuser field, which includes the reduction opcode.",
                     "default": 6
                 },  
                 "enable_narrow_collectives": {