CMPXCHG_LOCK

SEMAPHORE I486REAL x86_64

2 encoding forms.

XED_CMPXCHG_LOCK_X86_LEGACY_0F_B0_545035
MEM0:rcw:b REG0=GPR8_R():r REG1=XED_REG_AL:rcw:SUPP
X86_LEGACY B0 /r I486REAL
XED_CMPXCHG_LOCK_X86_LEGACY_0F_B1_449542
MEM0:rcw:v REG0=GPRv_R():r REG1=OrAX():rcw:SUPP
X86_LEGACY B1 /r I486REAL