Enable aot memory64 sw bounds checks by default (#4350)

- enable aot memory64 sw bounds checks by default

core/iwasm/compilation/aot_llvm.c

@@ -3204,6 +3204,21 @@ aot_create_comp_context(const AOTCompData *comp_data, aot_comp_option_t option)
 
 #if WASM_ENABLE_WAMR_COMPILER != 0
     WASMModule *wasm_module = (WASMModule *)comp_data->wasm_module;
+    bool is_memory64 = false;
+
+    /* TODO: multi-memories for now assuming the memory64 flag of a memory is
+     * consistent across multi-memories */
+    if (wasm_module->import_memory_count > 0)
+        is_memory64 = !!(wasm_module->import_memories[0].u.memory.mem_type.flags
+                         & MEMORY64_FLAG);
+    else if (wasm_module->memory_count > 0)
+        is_memory64 = !!(wasm_module->memories[0].flags & MEMORY64_FLAG);
+
+    if (!(option->bounds_checks == 1 || option->bounds_checks == 0)
+        && is_memory64) {
+        /* For memory64, the boundary check default value is true */
+        comp_ctx->enable_bound_check = true;
+    }
 
     /* Return error if SIMD is disabled by command line but SIMD instructions
      * are used */

wamr-compiler/main.c

@@ -137,9 +137,12 @@ print_help()
     printf("                              3 - Small code model\n");
     printf("  -sgx                      Generate code for SGX platform (Intel Software Guard Extensions)\n");
     printf("  --bounds-checks=1/0       Enable or disable the bounds checks for memory access:\n");
-    printf("                              by default it is disabled in all 64-bit platforms except SGX and\n");
-    printf("                              in these platforms runtime does bounds checks with hardware trap,\n");
-    printf("                              and by default it is enabled in all 32-bit platforms\n");
+    printf("                              This flag controls bounds checking with a software check. \n"); 
+    printf("                              On 64-bit platforms, it is disabled by default, using a hardware \n"); 
+    printf("                              trap if supported, except when SGX or memory64 is enabled,\n"); 
+    printf("                              which defaults to a software check.\n"); 
+    printf("                              On 32-bit platforms, the flag is enabled by default, using a software check\n");
+    printf("                              due to the lack of hardware support.\n"); 
     printf("                            CAVEAT: --bounds-checks=0 enables some optimizations\n");
     printf("                              which make the compiled AOT module incompatible\n");
     printf("                              with a runtime without the hardware bounds checks.\n");