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2ac288f919
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11297 6f19259b-4bc3-4df7-8a09-765794883524
58 lines
1.4 KiB
ArmAsm
58 lines
1.4 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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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#------------------------------------------------------------------------------
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.text
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.align 2
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GCC_ASM_EXPORT(__clzsi2)
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ASM_PFX(__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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