From dc2d54edf26dc266e4787b30fa796a4db1339936 Mon Sep 17 00:00:00 2001
From: ptitSeb <sebastien.chev@gmail.com>
Date: Sat, 22 Jun 2024 18:05:03 +0200
Subject: Added 66 F2/F3 A4 opcode ({DYNAREC] too)

---
 src/emu/x64run66.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/emu')

diff --git a/src/emu/x64run66.c b/src/emu/x64run66.c
index 536583bc..17199c71 100644
--- a/src/emu/x64run66.c
+++ b/src/emu/x64run66.c
@@ -477,7 +477,20 @@ uintptr_t Run66(x64emu_t *emu, rex_t rex, int rep, uintptr_t addr)
                 *(uint16_t*)F64 = R_AX;
         }
         break;
-
+    case 0xA4:                      /* (REP) MOVSB */
+        tmp8s = ACCESS_FLAG(F_DF)?-1:+1;
+        tmp64u = (rep)?R_RCX:1L;
+        while(tmp64u) {
+            #ifndef TEST_INTERPRETER
+            *(uint8_t*)R_RDI = *(uint8_t*)R_RSI;
+            #endif
+            R_RDI += tmp8s;
+            R_RSI += tmp8s;
+            --tmp64u;
+        }
+        if(rep)
+            R_RCX = tmp64u;
+        break;
     case 0xA5:              /* (REP) MOVSW */
         tmp8s = ACCESS_FLAG(F_DF)?-1:+1;
         tmp64u = (rep)?R_RCX:1L;
-- 
cgit 1.4.1