LXR linux/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
  33