I’m experimenting with the Intel x86 Hardware Lock Elision feature using assembly language and the MASM Assembler. I’m getting the following errors;

error A2008: syntax error : MOV
error A2008: syntax error : RET

The code is;

COMMENT '

 Hardware Lock Elision Test 1.

'

.686P
.MMX
.MODEL FLAT

.CODE

_main:

XACQUIRE MOV EAX, 10h

XRELEASE RET

END

It compiles fine without the XACQUIRE and XRELEASE prefixes.