src/compiler/alpha/pred.lisp

   1 ;;;; the VM definition of predicate VOPs for the Alpha
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   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.
  11
  12 (in-package "SB!VM")
  13 \f
  14 ;;;; the Branch VOP
  15
  16 ;;; The unconditional branch, emitted when we can't drop through to
  17 ;;; the desired destination. Dest is the continuation we transfer
  18 ;;; control to.
  19 (define-vop (branch)
  20   (:info dest)
  21   (:generator 5
  22     (inst br zero-tn dest)))
  23 \f
  24 ;;;; conditional VOPs
  25
  26 (define-vop (if-eq)
  27   (:args (x :scs (any-reg descriptor-reg zero null))
  28          (y :scs (any-reg descriptor-reg zero null)))
  29   (:conditional)
  30   (:temporary (:scs (non-descriptor-reg)) temp)
  31   (:info target not-p)
  32   (:policy :fast-safe)
  33   (:translate eq)
  34   (:generator 3
  35     (inst cmpeq x y temp)
  36     (if not-p
  37         (inst beq temp target)
  38         (inst bne temp target))))