[Bug gas/22871] Encode instructions of 64-bit operand without the REX_W bit

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22871

--- Comment #21 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Linus Torvalds from comment #19)
> (In reply to Linus Torvalds from comment #18)
> > 
> > Very interesting. I can confirm that testb seems slower on Skylake too.
> 
> Oh no, I take that back.
> 
> There's something else going on.
> 
> Sometimes I get results like this:
> 
> ./test
> testb  : 98279608
> testw  : 987334300
> testl  : 101367392
> testq  : 100247139
> 

I put my microbenchmark at

https://github.com/hjl-tools/microbenchmark

On Haswell, I got

testb  : 15226805
testw  : 45178699
testl  : 3956966
testq  : 4649570

How can I improve it?

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