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Test results for Intel's Sandy Bridge processor
Author: Agner Date: 2013-08-10 01:44
There are at least two different issues here. One is, as you suggested, that the fuseable instructions don't go into the last decoder. The other is that short instructions don't go into the µop cache if they generate a total of more than 18 µops per 32 bytes of code. Maybe there is also an alignment issue. We will have to do some more experiments to test this. You can easily make instructions longer (up to 15 bytes) by adding dummy segment prefixes ( db 3EH ).
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