James Hogan | 086e9dc | 2012-10-05 17:02:09 +0100 | [diff] [blame] | 1 | ! Copyright (C) 2012 by Imagination Technologies Ltd. |
| 2 | ! |
| 3 | ! 64-bit signed compare routine. |
| 4 | ! |
| 5 | |
| 6 | .text |
| 7 | .global ___cmpdi2 |
| 8 | .type ___cmpdi2,function |
| 9 | |
| 10 | ! low high |
| 11 | ! s64 a (D0Ar2, D1Ar1) |
| 12 | ! s64 b (D0Ar4, D1Ar3) |
| 13 | ___cmpdi2: |
| 14 | ! start at 1 (equal) and conditionally increment or decrement |
| 15 | MOV D0Re0,#1 |
| 16 | |
| 17 | ! high words differ? |
| 18 | CMP D1Ar1,D1Ar3 |
| 19 | BNE $Lhigh_differ |
| 20 | |
| 21 | ! unsigned compare low words |
| 22 | CMP D0Ar2,D0Ar4 |
| 23 | SUBLO D0Re0,D0Re0,#1 |
| 24 | ADDHI D0Re0,D0Re0,#1 |
| 25 | MOV PC,D1RtP |
| 26 | |
| 27 | $Lhigh_differ: |
| 28 | ! signed compare high words |
| 29 | SUBLT D0Re0,D0Re0,#1 |
| 30 | ADDGT D0Re0,D0Re0,#1 |
| 31 | MOV PC,D1RtP |
| 32 | .size ___cmpdi2,.-___cmpdi2 |