2016-06-21T00:00:46Z jasom: "(x << 10) | (x >> 54)" will generate a rotate on pretty much all modern optimizing C compilers.  Given that, in this case, C and Lisp are similar in not having a portable way of representing rotate, I expected sbcl would be able to take some form of this and generate a rotate.
2016-06-21T00:01:34Z stassats: well, wrong expectation, the compiler in sbcl is very simple minded
2016-06-21T00:01:42Z stassats: it's just better than other CL compilers
2016-06-21T00:02:59Z jasom: which is why I was asking if there were a good way to do this; to my (grounded in C) mind, IR2 seemed like a natural place to do so.
2016-06-21T00:03:00Z stassats: the only operations that sbcl optimizes beyond a single function is modular arithmetic
2016-06-21T00:03:06Z stassats: and that's done ugly as hell
2016-06-21T00:03:36Z stassats: no, VOPs are the wrong place
2016-06-21T00:04:08Z fe[nl]ix: jasom: the architecture of Python hasn't changed much in 25 years
2016-06-21T00:04:47Z fe[nl]ix: for being simple-minded it's pretty good
2016-06-21T00:04:57Z stassats: jasom: there's only one ASH but there's a gazillion VOPs that translate it, why would you want to deal with the VOPs?
2016-06-21T00:07:35Z jasom: stassats: because at IR2, Python has already done the hard work of determining if we can do fast arithmetic on it.
2016-06-21T00:09:37Z jasom: http://paste.lisp.org/display/318862 <-- this has a fast-ash fast-logand fast-ash sequence with only immediate values.  Transforming it is not hard.  Transforming it is only useful *if* the vops are relatively standard between archs and come from a relatively stable set.
2016-06-21T00:10:05Z stassats: ok, do it that way
2016-06-21T00:10:08Z stassats: what do i care
2016-06-21T00:11:53Z stassats: most of this is optimized in ir1 anyhow
2016-06-21T00:12:54Z stassats: and ir2 does a stinky job at representation selection
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2016-06-21T00:19:02Z jasom: anyways doing peepholes on IR2 seems no worse than doing it on assembly, since peephole performance is largely related to the window size, and there will typically be no more (and often fewer) VOPs than instructions.
2016-06-21T00:19:36Z stassats: (logior (ash x -54) (ash (ldb (byte 54 0) x) 10)) doesn't need a peephole optimizer
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