I believe that options 1 & 2 are ‘hardware optimized’ for that
operation.
I personally I prefer the exclusive OR method.
Keven
On Mon, Aug 10, 2020 at 2:13 PM -0500, "Schmitt, Michael"
<[email protected]> wrote:
There are many ways to set a register to binary zero. My question is, which is
the most efficient?
1. XR Rn,Rn
2. SR Rn,RN
3. SRA Rn,Rn
4. LHI Rn,0
5. Other instruction
6. Depends on hardware
7. Depends on other factors. (What?)
8. They are have equal performance
9. Method X has worse performance but other advantages. (What?)
____________________________________
Michael Schmitt | DXC.technology
(469) 808-4403 | [email protected]
DXC Technology Company - Headquarters: 1775 Tysons Boulevard, Tysons, Virginia
22102, USA.
DXC Technology Company -- This message is transmitted to you by or on behalf of
DXC Technology Company or one of its affiliates. It is intended exclusively for
the addressee. The substance of this message, along with any attachments, may
contain proprietary, confidential or privileged information or information that
is otherwise legally exempt from disclosure. Any unauthorized review, use,
disclosure or distribution is prohibited. If you are not the intended recipient
of this message, you are not authorized to read, print, retain, copy or
disseminate any part of this message. If you have received this message in
error, please destroy and delete all copies and notify the sender by return
e-mail. Regardless of content, this e-mail shall not operate to bind DXC
Technology Company or any of its affiliates to any order or other contract
unless pursuant to explicit written agreement or government initiative
expressly permitting the use of e-mail for such purpose. --.
