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https://github.com/CloverHackyColor/CloverBootloader.git
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50 lines
1.1 KiB
ArmAsm
50 lines
1.1 KiB
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(__clzsi2)
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@ frame_needed = 1, uses_anonymous_args = 0
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stmfd sp!, {r7, lr}
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add r7, sp, #0
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movs r3, r0, lsr #16
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movne r3, #16
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moveq r3, #0
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movne r9, #0
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moveq r9, #16
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mov r3, r0, lsr r3
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tst r3, #65280
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movne r0, #8
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moveq r0, #0
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movne lr, #0
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moveq lr, #8
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mov r3, r3, lsr r0
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tst r3, #240
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movne r0, #4
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moveq r0, #0
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movne ip, #0
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moveq ip, #4
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mov r3, r3, lsr r0
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tst r3, #12
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movne r0, #2
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moveq r0, #0
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movne r1, #0
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moveq r1, #2
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mov r2, r3, lsr r0
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add r3, lr, r9
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add r0, r3, ip
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add r1, r0, r1
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mov r0, r2, lsr #1
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eor r0, r0, #1
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ands r0, r0, #1
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mvnne r0, #0
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rsb r3, r2, #2
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and r0, r0, r3
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add r0, r1, r0
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ldmfd sp!, {r7, pc}
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