LXR linux/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
  34