Refine declaration of jit-cache

Author: vacantron

src/jit.h

@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include "common.h"
 #include "riscv_private.h"
 #include "utils.h"
 
@@ -56,20 +57,14 @@ typedef void (*exec_t2c_func_t)(riscv_t *);
 #endif
 
 #if RV32_HAS(JIT_CACHE)
-#if !defined(__x86_64__) && !defined(__aarch64__)
-/* make sure LLVM can access the correct address of structure member */
-#error "The JIT-cache only supports 64-bit machine (LP64)."
-#endif
-
 #define MAX_JIT_CACHE_TABLE_ENTRIES (1 << 12)
 
 /* clang-format off */
 struct jit_cache {
-    __attribute__((aligned(4))) uint32_t pc;   /* program counter of ELF */
-    __attribute__((aligned(4))) uint32_t from; /* from whether t1c or t2c,
-                                                  easily to build LLVM IR 
-                                                  because of the alignment
-                                                */
+    __ALIGNED(4) uint32_t pc;   /* program counter of ELF */
+    __ALIGNED(4) uint32_t from; /* from whether t1c or t2c, ensure the correct
+                                   alignment for accessing member in LLVM IR
+                                 */
     void *entry; /* entry of JIT-ed code */
 };
 /* clang-format on */