! Copyright (C) 2012 by Imagination Technologies Ltd. | |
! | |
! 64-bit logical shift right routine. | |
! | |
.text | |
.global ___lshrdi3 | |
.type ___lshrdi3,function | |
___lshrdi3: | |
MOV D0Re0,D0Ar2 | |
MOV D1Re0,D1Ar1 | |
CMP D1Ar3,#0 ! COUNT == 0 | |
MOVEQ PC,D1RtP ! Yes, return | |
MOV D0Ar4,D1Ar3 | |
SUBS D1Ar3,D1Ar3,#32 ! N = COUNT - 32 | |
BGE $L30 | |
!! Shift < 32 | |
NEG D1Ar3,D1Ar3 ! N = - N | |
LSR D0Re0,D0Re0,D0Ar4 ! LO = LO >> COUNT | |
LSL D0Ar6,D1Re0,D1Ar3 ! TMP= HI << -(COUNT - 32) | |
OR D0Re0,D0Re0,D0Ar6 ! LO = LO | TMP | |
SWAP D1Ar3,D0Ar4 | |
LSR D1Re0,D1Re0,D1Ar3 ! HI = HI >> COUNT | |
MOV PC,D1RtP | |
$L30: | |
!! Shift >= 32 | |
LSR D0Re0,D1Re0,D1Ar3 ! LO = HI >> N | |
MOV D1Re0,#0 ! HI = 0 | |
MOV PC,D1RtP | |
.size ___lshrdi3,.-___lshrdi3 |