1 files changed, 25 insertions, 10 deletions

diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index 33ebc7986..b846fbe9c 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -6101,17 +6101,32 @@ L_stm_s_takeabort:
 
                         return 1;
                 }
-                case 0x6c:
-                        if ((instr & 0xf03f0) == 0xf0070) { //uxtb16
-                                u8 rm_idx = BITS(0, 3);
-                                u8 rd_idx = BITS(12, 15);
-                                u32 rm_val = state->Reg[rm_idx];
-                                u32 rotation = BITS(10, 11) * 8;
-                                u32 in = ((rm_val << (32 - rotation)) | (rm_val >> rotation));
-                                state->Reg[rd_idx] = in & 0x00FF00FF;
+                case 0x6c: // UXTB16 and UXTAB16
+                        {
+                                const u8 rm_idx = BITS(0, 3);
+                                const u8 rn_idx = BITS(16, 19);
+                                const u8 rd_idx = BITS(12, 15);
+                                const u32 rm_val = state->Reg[rm_idx];
+                                const u32 rn_val = state->Reg[rn_idx];
+                                const u32 rotation = BITS(10, 11) * 8;
+                                const u32 rotated_rm = ((rm_val << (32 - rotation)) | (rm_val >> rotation));
+
+                                // UXTB16
+                                if ((instr & 0xf03f0) == 0xf0070) {
+                                        state->Reg[rd_idx] = rotated_rm & 0x00FF00FF;
+                                }
+                                else { // UXTAB16
+                                        const u8 lo_rotated = (rotated_rm & 0xFF);
+                                        const u16 lo_result = (rn_val & 0xFFFF) + (u16)lo_rotated;
+
+                                        const u8 hi_rotated = (rotated_rm >> 16) & 0xFF;
+                                        const u16 hi_result = (rn_val >> 16) + (u16)hi_rotated;
+
+                                        state->Reg[rd_idx] = ((hi_result << 16) | (lo_result & 0xFFFF));
+                                }
+
                                 return 1;
-                        } else
-                                printf ("Unhandled v6 insn: uxtab16\n");
+                        }
                         break;
                 case 0x6e: {
                         ARMword Rm;