arch/metag/lib/ashrdi3.S

   1 ! Copyright (C) 2012 by Imagination Technologies Ltd.
   2 !
   3 ! 64-bit arithmetic shift right routine.
   4 !
   5
   6         .text
   7         .global ___ashrdi3
   8         .type   ___ashrdi3,function
   9
  10 ___ashrdi3:
  11         MOV     D0Re0,D0Ar2
  12         MOV     D1Re0,D1Ar1
  13         CMP     D1Ar3,#0                ! COUNT == 0
  14         MOVEQ   PC,D1RtP                ! Yes, return
  15
  16         MOV     D0Ar4,D1Ar3
  17         SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
  18         BGE     $L20
  19
  20 !! Shift < 32
  21         NEG     D1Ar3,D1Ar3             ! N = - N
  22         LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
  23         LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
  24         OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
  25         SWAP    D1Ar3,D0Ar4
  26         ASR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
  27         MOV     PC,D1RtP
  28 $L20:
  29 !! Shift >= 32
  30         ASR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
  31         ASR     D1Re0,D1Re0,#31         ! HI = HI >> 31
  32         MOV     PC,D1RtP
  33         .size ___ashrdi3,.-___ashrdi3