arch/metag/lib/cmpdi2.S

   1 ! SPDX-License-Identifier: GPL-2.0
   2 ! Copyright (C) 2012 by Imagination Technologies Ltd.
   3 !
   4 ! 64-bit signed compare routine.
   5 !
   6
   7         .text
   8         .global ___cmpdi2
   9         .type   ___cmpdi2,function
  10
  11 !         low    high
  12 ! s64 a  (D0Ar2, D1Ar1)
  13 ! s64 b  (D0Ar4, D1Ar3)
  14 ___cmpdi2:
  15         ! start at 1 (equal) and conditionally increment or decrement
  16         MOV     D0Re0,#1
  17
  18         ! high words differ?
  19         CMP     D1Ar1,D1Ar3
  20         BNE     $Lhigh_differ
  21
  22         ! unsigned compare low words
  23         CMP     D0Ar2,D0Ar4
  24         SUBLO   D0Re0,D0Re0,#1
  25         ADDHI   D0Re0,D0Re0,#1
  26         MOV     PC,D1RtP
  27
  28 $Lhigh_differ:
  29         ! signed compare high words
  30         SUBLT   D0Re0,D0Re0,#1
  31         ADDGT   D0Re0,D0Re0,#1
  32         MOV     PC,D1RtP
  33         .size ___cmpdi2,.-___cmpdi2