1 ;;;; predicate VOPs for the x86 VM
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
16 ;;; The unconditional branch, emitted when we can't drop through to the desired
17 ;;; destination. Dest is the continuation we transfer control to.
26 ;;; Note: a constant-tn is allowed in CMP; it uses an EA displacement,
27 ;;; not immediate data.
29 (:args (x :scs (any-reg descriptor-reg control-stack constant)
30 :load-if (not (and (sc-is x immediate)
31 (sc-is y any-reg descriptor-reg
32 control-stack constant))))
33 (y :scs (any-reg descriptor-reg immediate)
34 :load-if (not (and (sc-is x any-reg descriptor-reg immediate)
35 (sc-is y control-stack constant)))))
41 (let ((x-val (encode-value-if-immediate x))
42 (y-val (encode-value-if-immediate y)))
44 ;; Shorter instruction sequences for these two cases.
45 ((eql 0 y-val) (inst test x x))
46 ((eql 0 x-val) (inst test y y))
48 ;; An encoded value (literal integer) has to be the second argument.
49 ((sc-is x immediate) (inst cmp y x-val))
51 (t (inst cmp x y-val))))
53 (inst jmp (if not-p :ne :e) target)))