arch/metag/lib/ashrdi3.S

   1 ! SPDX-License-Identifier: GPL-2.0
   2 ! Copyright (C) 2012 by Imagination Technologies Ltd.
   3 !
   4 ! 64-bit arithmetic shift right routine.
   5 !
   6
   7         .text
   8         .global ___ashrdi3
   9         .type   ___ashrdi3,function
  10
  11 ___ashrdi3:
  12         MOV     D0Re0,D0Ar2
  13         MOV     D1Re0,D1Ar1
  14         CMP     D1Ar3,#0                ! COUNT == 0
  15         MOVEQ   PC,D1RtP                ! Yes, return
  16
  17         MOV     D0Ar4,D1Ar3
  18         SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
  19         BGE     $L20
  20
  21 !! Shift < 32
  22         NEG     D1Ar3,D1Ar3             ! N = - N
  23         LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
  24         LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
  25         OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
  26         SWAP    D1Ar3,D0Ar4
  27         ASR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
  28         MOV     PC,D1RtP
  29 $L20:
  30 !! Shift >= 32
  31         ASR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
  32         ASR     D1Re0,D1Re0,#31         ! HI = HI >> 31
  33         MOV     PC,D1RtP
  34         .size ___ashrdi3,.-___ashrdi3