Followup to: <[email protected]>
By author: "Albert Cahalan" <[email protected]>
In newsgroup: linux.dev.kernel
>
> The bigger problem is that 32-bit code has fewer CPU registers.
> (nobody has done an ILP32 ABI for long mode) This is slow.
>
The issue isn't the ABI, the issue is that the processor doesn't
support it, since some of the opcodes mean different things in 16-,
32- and 64-bit mode. The opcodes which access the high half of the
register sets (REX prefixes) in 64-bit mode are INC and DEC
instructions in 16- and 32-bit mode.
AMD was apparently considering adding a "REX32" mode at some point,
but rather predictably noone was interested enough to make it
worthwhile.
-hpa
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