Save the segment selectors with explicit asm, rather than with read_sreg().
This permits the use of MOV's m16 encoding, which avoids indirecting the
selector value through a register.
For {save,load}_segments(), opencode the fs/gs helpers, as the optimiser is
unable to rearrange the logic down to
On 09.09.2020 11:59, Andrew Cooper wrote:
> Save the segment selectors with explicit asm, rather than with read_sreg().
> This permits the use of MOV's m16 encoding, which avoids indirecting the
> selector value through a register.
Instead of this, how about making read_sreg() look like
#define r
On 11.09.2020 14:53, Andrew Cooper wrote:
> On 11/09/2020 10:49, Jan Beulich wrote:
>> On 09.09.2020 11:59, Andrew Cooper wrote:
>>> Save the segment selectors with explicit asm, rather than with read_sreg().
>>> This permits the use of MOV's m16 encoding, which avoids indirecting the
>>> selector
On 11/09/2020 10:49, Jan Beulich wrote:
> On 09.09.2020 11:59, Andrew Cooper wrote:
>> Save the segment selectors with explicit asm, rather than with read_sreg().
>> This permits the use of MOV's m16 encoding, which avoids indirecting the
>> selector value through a register.
> Instead of this, how
