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