Linux tends to favour AT&T style x86 assembly code for some reason. It's quite awful. For doing Windows development you probably use Visual Studio which supports the far more readable Intel style syntax. Sample code from Intel uses this style too generally. Note that you cannot write inline assembly for 64 bits apps with Visual Studio, it works only for 32 bit apps. 64 bit apps are expected to use intrinsics instead. I don't believe gcc has this restriction.