> how they interact with the FS/GS prefixes (64/65)
For memory operations, they are ignored: 64-2e-65-3e gives 65 as segment override. (From my memory and the resulting implementation, I did some tests with hardware a few years back.)
I do need to check myself how 2e/3e on branches interact with other segment overrides, though.
For memory operations, they are ignored: 64-2e-65-3e gives 65 as segment override. (From my memory and the resulting implementation, I did some tests with hardware a few years back.)
I do need to check myself how 2e/3e on branches interact with other segment overrides, though.