<div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif">CCL's optimizers do a pretty good job, if you tell them to:</div><div class="gmail_default" style="font-family:georgia,serif"><br></div><div class="gmail_default" style=""><font face="monospace">CL-USER> (defun add (x y)<br>           (declare (fixnum x y) (optimize (speed 3) (safety 0)))<br>           (the fixnum (+ x y)))<br>ADD<br>CL-USER> (disassemble 'add)<br>    (recover-fn-from-rip)                   ;     [0]<br>    (pushq (% rbp))                         ;     [7]<br>    (movq (% rsp) (% rbp))                  ;     [8]<br>    (pushq (% arg_y))                       ;    [11]<br>    (pushq (% arg_z))                       ;    [12]<br>    (movq (@ -8 (% rbp)) (% arg_y))         ;    [13]<br>    (movq (@ -16 (% rbp)) (% arg_z))        ;    [17]<br>    (addq (% arg_y) (% arg_z))              ;    [21]<br>    (movq (% rbp) (% rsp))                  ;    [24]<br>    (popq (% rbp))                          ;    [27]<br>    (retq)                                  ;    [28]<br>NIL</font><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 18, 2020 at 6:43 AM Michał "phoe" Herda <<a href="mailto:phoe@disroot.org">phoe@disroot.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">> I would like to use arithmetic primitives (add, mul, sub, div, ..) in<br>
ccl, is this possible?<br>
<br>
Hey!<br>
<br>
I assume that you mean using the raw CPU assembly instructions of the<br>
architecture on which you are. This means that you will not only need<br>
raw assembly instructions, but you will also need raw machine integers;<br>
basically writing assembly in CCL.<br>
<br>
It's possible to write LAP (short for Lisp Assembly Program) functions<br>
for Clozure Common Lisp; see<br>
<a href="https://github.com/Clozure/ccl/blob/275105afd94706d95ac955178316074931822c42/level-0/X86/X8632/x8632-numbers.lisp" rel="noreferrer" target="_blank">https://github.com/Clozure/ccl/blob/275105afd94706d95ac955178316074931822c42/level-0/X86/X8632/x8632-numbers.lisp</a><br>
for example number-operating functions for x32. I am not aware if there<br>
any tutorials or documentation for these, though.<br>
<br>
~phoe<br>
<br>
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</blockquote></div>