XCHG is slow ?

[John Rose]

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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