XCHG is slow ?

[Vitaly Davidovich]

I think it's because the two mnemonics are actually the same instruction so
disassembler must be picking the xchg one?

Sent from my phone
On Jul 3, 2012 7:44 PM, "John Rose" <john.r.rose at oracle.com> wrote:

> On Jul 3, 2012, at 4:39 PM, John Rose wrote:
>
>   0x0000000104760bde: xchg   %ax,%ax            ;...6690
>
>
> Hence this line in assembler_x86.cpp:
>
>         emit_byte(0x90); // nop
>
> But I don't know why that displays as xchg.  — John
>
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