Re: [RFC] gcc feature request: Moving blocks into sections

From: H. Peter Anvin
Date: Tue Aug 06 2013 - 12:19:59 EST

On 08/06/2013 09:15 AM, Steven Rostedt wrote:
> On Mon, 2013-08-05 at 14:43 -0700, H. Peter Anvin wrote:
>> For unconditional jmp that should be pretty safe barring any fundamental
>> changes to the instruction set, in which case we can enable it as
>> needed, but for extra robustness it probably should skip prefix bytes.
> Would the assembler add prefix bytes to:
> jmp 1f

No, but if we ever end up doing MPX in the kernel, for example, we would
have to put an MPX prefix on the jmp.


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