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! Copyright (C) 2012 by Imagination Technologies Ltd.
!
! 64-bit arithmetic shift right routine.
!
.text
.global ___ashrdi3
.type ___ashrdi3,function
___ashrdi3:
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 $L20
!! 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
ASR D1Re0,D1Re0,D1Ar3 ! HI = HI >> COUNT
MOV PC,D1RtP
$L20:
!! Shift >= 32
ASR D0Re0,D1Re0,D1Ar3 ! LO = HI >> N
ASR D1Re0,D1Re0,#31 ! HI = HI >> 31
MOV PC,D1RtP
.size ___ashrdi3,.-___ashrdi3
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