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-rw-r--r--x86_64-asm.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/x86_64-asm.h b/x86_64-asm.h
index 4db3268..675e7df 100644
--- a/x86_64-asm.h
+++ b/x86_64-asm.h
@@ -394,6 +394,9 @@ ALT(DEF_ASM_OP2(cmpxchgb, 0x0fb0, 0, OPC_MODRM | OPC_BWLX, OPT_REG, OPT_REG | OP
/* pentium */
DEF_ASM_OP1(cmpxchg8b, 0x0fc7, 1, OPC_MODRM, OPT_EA )
+ /* AMD 64 */
+ DEF_ASM_OP1(cmpxchg16b, 0x480fc7, 1, OPC_MODRM, OPT_EA )
+
/* pentium pro */
ALT(DEF_ASM_OP2(cmovo, 0x0f40, 0, OPC_MODRM | OPC_TEST | OPC_WLX, OPT_REGW | OPT_EA, OPT_REGW))