| #------------------------------------------------------------------------------ | |
| # | |
| # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> | |
| # | |
| # SPDX-License-Identifier: BSD-2-Clause-Patent | |
| # | |
| #------------------------------------------------------------------------------ | |
| #include <AsmMacroIoLib.h> | |
| ASM_FUNC(__ctzsi2) | |
| uxth r3, r0 | |
| cmp r3, #0 | |
| moveq ip, #16 | |
| movne ip, #0 | |
| @ lr needed for prologue | |
| mov r0, r0, lsr ip | |
| tst r0, #255 | |
| movne r3, #0 | |
| moveq r3, #8 | |
| mov r0, r0, lsr r3 | |
| tst r0, #15 | |
| movne r1, #0 | |
| moveq r1, #4 | |
| add r3, r3, ip | |
| mov r0, r0, lsr r1 | |
| tst r0, #3 | |
| movne r2, #0 | |
| moveq r2, #2 | |
| add r3, r3, r1 | |
| mov r0, r0, lsr r2 | |
| and r0, r0, #3 | |
| add r2, r3, r2 | |
| eor r3, r0, #1 | |
| mov r0, r0, lsr #1 | |
| ands r3, r3, #1 | |
| mvnne r3, #0 | |
| rsb r0, r0, #2 | |
| and r0, r3, r0 | |
| add r0, r2, r0 | |
| bx lr |