From e5de89fb3fceb511897c7efe3ab26f533b3a0c71 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Tue, 7 Oct 2025 19:10:27 +0200
Subject: [PATCH] optimized post_inc and post_dec

---
 quickjs.c | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/quickjs.c b/quickjs.c
index 97c6cbf..41f59fb 100644
--- 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):
             {