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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
|
|
