armemu: Set the Q flag properly for SMLAD/SMUAD

1 files changed, 8 insertions, 0 deletions

diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp
index b31c0ea2..6774f8a7 100644
--- a/src/core/arm/interpreter/armsupp.cpp
+++ b/src/core/arm/interpreter/armsupp.cpp
@@ -444,6 +444,14 @@ ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
     ASSIGNV (AddOverflow (a, b, result));
 }
 
+/* Assigns the Q flag if the given result is considered an overflow from the addition of a and b  */
+void ARMul_AddOverflowQ(ARMul_State* state, ARMword a, ARMword b)
+{
+    u32 result = a + b;
+    if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0)
+        SETQ;
+}
+
 /* Assigns the C flag after an subtraction of a and b to give result.  */
 
 void