optimized post_inc and post_dec

Fabrice Bellard · Fabrice Bellard · commit e5de89fb3fce · 2025-10-07T19:10:27.000+02:00
diff --git a/quickjs.c b/quickjs.c
@@ -19045,11 +19045,42 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
             }
             BREAK;
         CASE(OP_post_inc):
+            {
+                JSValue op1;
+                int val;
+                op1 = sp[-1];
+                if (JS_VALUE_GET_TAG(op1) == JS_TAG_INT) {
+                    val = JS_VALUE_GET_INT(op1);
+                    if (unlikely(val == INT32_MAX))
+                        goto post_inc_slow;
+                    sp[0] = JS_NewInt32(ctx, val + 1);
+                } else {
+                post_inc_slow:
+                    sf->cur_pc = pc;
+                    if (js_post_inc_slow(ctx, sp, opcode))
+                        goto exception;
+                }
+                sp++;
+            }
+            BREAK;
         CASE(OP_post_dec):
-            sf->cur_pc = pc;
-            if (js_post_inc_slow(ctx, sp, opcode))
-                goto exception;
-            sp++;
+            {
+                JSValue op1;
+                int val;
+                op1 = sp[-1];
+                if (JS_VALUE_GET_TAG(op1) == JS_TAG_INT) {
+                    val = JS_VALUE_GET_INT(op1);
+                    if (unlikely(val == INT32_MIN))
+                        goto post_dec_slow;
+                    sp[0] = JS_NewInt32(ctx, val - 1);
+                } else {
+                post_dec_slow:
+                    sf->cur_pc = pc;
+                    if (js_post_inc_slow(ctx, sp, opcode))
+                        goto exception;
+                }
+                sp++;
+            }
             BREAK;
         CASE(OP_inc_loc):
             {
