projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| fc26361e DH |
1 | /* __ucmpdi2.S: 64-bit unsigned compare |
| 2 | * | |
| 3 | * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells (dhowells@redhat.com) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public License | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the License, or (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | ||
| 13 | .text | |
| 14 | .p2align 4 | |
| 15 | ||
| 16 | ############################################################################### | |
| 17 | # | |
| 18 | # int __ucmpdi2(unsigned long long a [D0:D1], | |
| 19 | # unsigned long long b [(SP,12),(SP,16)]) | |
| 20 | # | |
| 21 | # - returns 0, 1, or 2 as a <, =, > b respectively. | |
| 22 | # | |
| 23 | ############################################################################### | |
| 24 | .globl __ucmpdi2 | |
| 25 | .type __ucmpdi2,@function | |
| 26 | __ucmpdi2: | |
| 27 | mov (12,sp),a0 # b.lsw | |
| 28 | mov (16,sp),a1 # b.msw | |
| 29 | ||
| 30 | sub a0,d0 | |
| 31 | subc a1,d1 # may clear Z, never sets it | |
| 32 | bne __ucmpdi2_differ # a.msw != b.msw | |
| 33 | mov +1,d0 | |
| 34 | rets | |
| 35 | ||
| 36 | __ucmpdi2_differ: | |
| 37 | # C flag is set if LE, clear if GE | |
| 38 | subc d0,d0 # -1 if LE, 0 if GE | |
| 39 | add +1,d0 # 0 if LE, 1 if GE | |
| 40 | add d0,d0 # 0 if LE, 2 if GE | |
| 41 | rets | |
| 42 | ||
| 43 | .size __ucmpdi2, .-__ucmpdi2 |