arch/metag/lib/ashldi3.S

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