arch/metag/lib/ashldi3.S

   1 ! SPDX-License-Identifier: GPL-2.0
   2 ! Copyright (C) 2012 by Imagination Technologies Ltd.
   3 !
   4 ! 64-bit arithmetic shift left routine.
   5 !
   6
   7         .text
   8         .global ___ashldi3
   9         .type   ___ashldi3,function
  10
  11 ___ashldi3:
  12         MOV     D0Re0,D0Ar2
  13         MOV     D1Re0,D1Ar1
  14         CMP     D1Ar3,#0                ! COUNT == 0
  15         MOVEQ   PC,D1RtP                ! Yes, return
  16
  17         SUBS    D0Ar4,D1Ar3,#32         ! N = COUNT - 32
  18         BGE     $L10
  19
  20 !! Shift < 32
  21         NEG     D0Ar4,D0Ar4             ! N = - N
  22         LSL     D1Re0,D1Re0,D1Ar3       ! HI = HI << COUNT
  23         LSR     D0Ar6,D0Re0,D0Ar4       ! TMP= LO >> -(COUNT - 32)
  24         OR      D1Re0,D1Re0,D0Ar6       ! HI = HI | TMP
  25         SWAP    D0Ar4,D1Ar3
  26         LSL     D0Re0,D0Re0,D0Ar4       ! LO = LO << COUNT
  27         MOV     PC,D1RtP
  28
  29 $L10:
  30 !! Shift >= 32
  31         LSL     D1Re0,D0Re0,D0Ar4       ! HI = LO << N
  32         MOV     D0Re0,#0                ! LO = 0
  33         MOV     PC,D1RtP
  34         .size ___ashldi3,.-___ashldi3