| James Hogan | 086e9dc | 2012-10-05 17:02:09 +0100 | [diff] [blame] | 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 |