Re: [Xen-devel] [PATCH] x86/entry: Use 32bit xors rater than 64bit xors for clearing GPRs

2018-02-15 Thread Jan Beulich
>>> On 14.02.18 at 14:14, wrote: > Intel's Silvermont/Knights Landing architecture treats them as full ALU > operations, rather than zeroing idoms. > > No functional change, and no change in code volume (only changing the bit > selection in the REX prefix). > > Signed-off-by: Andrew Cooper > --

[Xen-devel] [PATCH] x86/entry: Use 32bit xors rater than 64bit xors for clearing GPRs

2018-02-14 Thread Andrew Cooper
Intel's Silvermont/Knights Landing architecture treats them as full ALU operations, rather than zeroing idoms. No functional change, and no change in code volume (only changing the bit selection in the REX prefix). Signed-off-by: Andrew Cooper --- CC: Jan Beulich If anyone is interested, <2018