tests : add --list-ops and --show-coverage options (#15745)

This commit adds two new command-line options to the
test-backend-ops.cpp that allow users to list all available GGML
operations and to show test coverage of these operations.

The motivation for this is that it can be useful to quickly see which
operations are currently covered by tests and which are not. Also it
migth be useful when using the `support` mode.

tests/test-backend-ops.cpp

@@ -34,6 +34,7 @@
 #include <memory>
 #include <random>
 #include <regex>
+#include <set>
 #include <string>
 #include <string_view>
 #include <thread>
@@ -6741,8 +6742,90 @@ static bool test_backend(ggml_backend_t backend, test_mode mode, const char * op
     GGML_ABORT("fatal error");
 }
 
+static void list_all_ops() {
+    printf("GGML operations:\n");
+    std::set<std::string> all_ops;
+
+    for (int i = 1; i < GGML_OP_COUNT; i++) {
+        all_ops.insert(ggml_op_name((enum ggml_op)i));
+    }
+    for (int i = 0; i < GGML_UNARY_OP_COUNT; i++) {
+        all_ops.insert(ggml_unary_op_name((enum ggml_unary_op)i));
+    }
+    for (int i = 0; i < GGML_GLU_OP_COUNT; i++) {
+        all_ops.insert(ggml_glu_op_name((enum ggml_glu_op)i));
+    }
+    for (const auto & op : all_ops) {
+        printf("  %s\n", op.c_str());
+    }
+    printf("\nTotal: %zu operations\n", all_ops.size());
+}
+
+static void show_test_coverage() {
+    std::set<std::string> all_ops;
+    for (int i = 1; i < GGML_OP_COUNT; i++) {
+        all_ops.insert(ggml_op_name((enum ggml_op)i));
+    }
+    for (int i = 0; i < GGML_UNARY_OP_COUNT; i++) {
+        all_ops.insert(ggml_unary_op_name((enum ggml_unary_op)i));
+    }
+    for (int i = 0; i < GGML_GLU_OP_COUNT; i++) {
+        all_ops.insert(ggml_glu_op_name((enum ggml_glu_op)i));
+    }
+    auto test_cases = make_test_cases_eval();
+    std::set<std::string> tested_ops;
+
+    ggml_init_params params = {
+        /* .mem_size = */ ggml_tensor_overhead()*128 + ggml_graph_overhead(),
+        /* .mem_base = */ NULL,
+        /* .no_alloc = */ true,
+    };
+
+    for (auto & test_case : test_cases) {
+        ggml_context * ctx = ggml_init(params);
+        if (ctx) {
+            test_case->mode = MODE_TEST;
+            ggml_tensor * out = test_case->build_graph(ctx);
+            if (out && out->op != GGML_OP_NONE) {
+                if (out->op == GGML_OP_UNARY) {
+                    tested_ops.insert(ggml_unary_op_name(ggml_get_unary_op(out)));
+                } else if (out->op == GGML_OP_GLU) {
+                    tested_ops.insert(ggml_glu_op_name(ggml_get_glu_op(out)));
+                } else {
+                    tested_ops.insert(ggml_op_name(out->op));
+                }
+            }
+            ggml_free(ctx);
+        }
+    }
+    std::set<std::string> covered_ops;
+    std::set<std::string> uncovered_ops;
+    for (const auto & op : all_ops) {
+        if (tested_ops.count(op) > 0) {
+            covered_ops.insert(op);
+        } else {
+            uncovered_ops.insert(op);
+        }
+    }
+
+    printf("Operations covered by tests (%zu):\n", covered_ops.size());
+    for (const auto & op : covered_ops) {
+        printf("  ✓ %s\n", op.c_str());
+    }
+    printf("\nOperations without tests (%zu):\n", uncovered_ops.size());
+    for (const auto & op : uncovered_ops) {
+        printf("  ✗ %s\n", op.c_str());
+    }
+
+    printf("\nCoverage Summary:\n");
+    printf("  Total operations: %zu\n", all_ops.size());
+    printf("  Tested operations: %zu\n", covered_ops.size());
+    printf("  Untested operations: %zu\n", uncovered_ops.size());
+    printf("  Coverage: %.1f%%\n", (double)covered_ops.size() / all_ops.size() * 100.0);
+}
+
 static void usage(char ** argv) {
-    printf("Usage: %s [mode] [-o <op,..>] [-b <backend>] [-p <params regex>] [--output <console|sql|csv>]\n", argv[0]);
+    printf("Usage: %s [mode] [-o <op,..>] [-b <backend>] [-p <params regex>] [--output <console|sql|csv>] [--list-ops] [--show-coverage]\n", argv[0]);
     printf("    valid modes:\n");
     printf("      - test (default, compare with CPU backend for correctness)\n");
     printf("      - grad (compare gradients from backpropagation with method of finite differences)\n");
@@ -6751,6 +6834,8 @@ static void usage(char ** argv) {
     printf("    op names for -o are as given by ggml_op_desc() (e.g. ADD, MUL_MAT, etc),\n");
     printf("        optionally including the full test case string (e.g. \"ADD(type=f16,ne=[1,1,8,1],nr=[1,1,1,1],nf=1)\")\n");
     printf("    --output specifies output format (default: console, options: console, sql, csv)\n");
+    printf("    --list-ops lists all available GGML operations\n");
+    printf("    --show-coverage shows test coverage\n");
 }
 
 int main(int argc, char ** argv) {
@@ -6800,6 +6885,12 @@ int main(int argc, char ** argv) {
                 usage(argv);
                 return 1;
             }
+        } else if (strcmp(argv[i], "--list-ops") == 0) {
+            list_all_ops();
+            return 0;
+        } else if (strcmp(argv[i], "--show-coverage") == 0) {
+            show_test_coverage();
+            return 0;
         } else {
             usage(argv);
             return 1;