kernel/arch/metag/lib/cmpdi2.S

   1 ! Copyright (C) 2012 by Imagination Technologies Ltd.
   2 !
   3 ! 64-bit signed compare routine.
   4 !
   5
   6         .text
   7         .global ___cmpdi2
   8         .type   ___cmpdi2,function
   9
  10 !         low    high
  11 ! s64 a  (D0Ar2, D1Ar1)
  12 ! s64 b  (D0Ar4, D1Ar3)
  13 ___cmpdi2:
  14         ! start at 1 (equal) and conditionally increment or decrement
  15         MOV     D0Re0,#1
  16
  17         ! high words differ?
  18         CMP     D1Ar1,D1Ar3
  19         BNE     $Lhigh_differ
  20
  21         ! unsigned compare low words
  22         CMP     D0Ar2,D0Ar4
  23         SUBLO   D0Re0,D0Re0,#1
  24         ADDHI   D0Re0,D0Re0,#1
  25         MOV     PC,D1RtP
  26
  27 $Lhigh_differ:
  28         ! signed compare high words
  29         SUBLT   D0Re0,D0Re0,#1
  30         ADDGT   D0Re0,D0Re0,#1
  31         MOV     PC,D1RtP
  32         .size ___cmpdi2,.-___cmpdi2