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| #------------------------------------------------------------------------------
| #
| # 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
|
|
