projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 06dc4de1 A |
1 | #------------------------------------------------------------------------------ |
| 2 | # | |
| d6ebcab7 | 3 | # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> |
| 06dc4de1 | 4 | # |
| d6ebcab7 | 5 | # This program and the accompanying materials |
| 06dc4de1 A |
6 | # are licensed and made available under the terms and conditions of the BSD License |
| 7 | # which accompanies this distribution. The full text of the license may be found at | |
| 8 | # http://opensource.org/licenses/bsd-license.php | |
| 9 | # | |
| 10 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| 11 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| 12 | # | |
| 13 | #------------------------------------------------------------------------------ | |
| 14 | ||
| 15 | .text | |
| 16 | .align 2 | |
| 4e471bfd | 17 | .globl ASM_PFX(__ctzsi2) |
| 63ca7402 | 18 | INTERWORK_FUNC(__ctzsi2)\r |
| 4e471bfd | 19 | |
| 20 | ASM_PFX(__ctzsi2): | |
| 06dc4de1 A |
21 | uxth r3, r0 |
| 22 | cmp r3, #0 | |
| 23 | moveq ip, #16 | |
| 24 | movne ip, #0 | |
| 25 | @ lr needed for prologue | |
| 26 | mov r0, r0, lsr ip | |
| 27 | tst r0, #255 | |
| 28 | movne r3, #0 | |
| 29 | moveq r3, #8 | |
| 30 | mov r0, r0, lsr r3 | |
| 31 | tst r0, #15 | |
| 32 | movne r1, #0 | |
| 33 | moveq r1, #4 | |
| 34 | add r3, r3, ip | |
| 35 | mov r0, r0, lsr r1 | |
| 36 | tst r0, #3 | |
| 37 | movne r2, #0 | |
| 38 | moveq r2, #2 | |
| 39 | add r3, r3, r1 | |
| 40 | mov r0, r0, lsr r2 | |
| 41 | and r0, r0, #3 | |
| 42 | add r2, r3, r2 | |
| 43 | eor r3, r0, #1 | |
| 44 | mov r0, r0, lsr #1 | |
| 45 | ands r3, r3, #1 | |
| 46 | mvnne r3, #0 | |
| 47 | rsb r0, r0, #2 | |
| 48 | and r0, r3, r0 | |
| 49 | add r0, r2, r0 | |
| 50 | bx lr |