// Emit the address size opcode prefix as needed.
bool need_address_override;
- if (TSFlags & X86II::AdSize) {
+ // The AdSize prefix is only for 32-bit and 64-bit modes; in 16-bit mode we
+ // need the address override only for JECXZ instead. Since it's only one
+ // instruction, we special-case it rather than introducing an AdSize16 bit.
+ if ((!is16BitMode() && TSFlags & X86II::AdSize) ||
+ (is16BitMode() && MI.getOpcode() == X86::JECXZ_32)) {
need_address_override = true;
} else if (MemOperand == -1) {
need_address_override = false;
lcalll $0x2, $0x1234
+L1:
+ jcxz L1
+// CHECK: jcxz L1
+// CHECK: encoding: [0xe3,A]
+ jecxz L1
+// CHECK: jecxz L1
+// CHECK: encoding: [0x67,0xe3,A]
+
iret
// CHECK: iretw
// CHECK: encoding: [0xcf]