diff --git a/boot.c b/boot.c
index f5a33e7..3476acc 100644
--- a/boot.c
+++ b/boot.c
@@ -1033,7 +1033,7 @@ int asm_sub(int lhs, int rhs) {
             exit(1);
         }
         int diff = asm_rr(TYPE_INT, "sub", lhs, rhs);
-        _asm_ri("slli", diff, diff, log_step_of(lhs_type));
+        _asm_ri("srai", diff, diff, log_step_of(lhs_type));
         return diff;
     }
     if (type1) {
@@ -1818,7 +1818,7 @@ void parse_global_variable(int id, const char* name, int type) {
     printf("%s:\n", name);
     if (token_type == TOKEN_ASSIGN) {
         expect_token(TOKEN_NUMBER);
-        printf("  .word %d\n", token_data);
+        printf("  .dword %d\n", token_data);
     } else if (token_type == TOKEN_BRACKET_LEFT) {
         if (type & TYPE_PTR_MASK) {
             eprintf("array of pointers is not supported\n");
@@ -1827,14 +1827,11 @@ void parse_global_variable(int id, const char* name, int type) {
         expect_token(TOKEN_NUMBER);
         int size = token_data;
         expect_token(TOKEN_BRACKET_RIGHT);
-        int array_size = 4 * size;
-        if (type == TYPE_CHAR) {
-            array_size = size;
-        }
+        int array_size = type == TYPE_CHAR ? size : 4 * size;
         printf("  .zero %d\n", array_size);
         declare_global(id, MARKER_ARRAY, type);
     } else {
-        printf("  .zero %d\n", 4);
+        printf("  .zero %d\n", 8);
         unget_token();
     }
     expect_token(TOKEN_SEMICOLON);
diff --git a/demo/add.c b/demo/add.c
index f42e07e..3623da5 100644
--- a/demo/add.c
+++ b/demo/add.c
@@ -1,11 +1,18 @@
 int printf(const char format[], ...);
 int scanf(const char format[], ...);
-int putchar(int ch);
 
-int* p;
+void should_be(int expected, int actual) {
+    if (expected != actual) {
+        printf("Expected %d, but got %d\n", expected, actual);
+    } else {
+        printf("Passed\n");
+    }
+}
+
+int* p = 0;
 int f1() {
     int a = 1;
-    return *(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(p))))))))))); // a[10]
+    return *(a+(a+(a+(a+(a+(a+(a+(a+(a+(a+(p))))))))))); // p[10]
 }
 
 
@@ -13,5 +20,8 @@ int main() {
     int a[15];
     p = a;
     for (int i = 0; i < 15; a[i] = i, ++i);
-    return f1();
+    p -= 5;
+    should_be(5, f1());
+    should_be(5, a - p);
+    should_be(10, 5);
 }
\ No newline at end of file