1#------------------------------------------------------------------------------ 2# 3# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> 4# 5# This program and the accompanying materials 6# are licensed and made available under the terms and conditions of the BSD License 7# which accompanies this distribution. The full text of the license may be found at 8# http://opensource.org/licenses/bsd-license.php 9# 10# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12# 13#------------------------------------------------------------------------------ 14 15#include <AsmMacroIoLib.h> 16 17ASM_FUNC(__clzsi2) 18 @ frame_needed = 1, uses_anonymous_args = 0 19 stmfd sp!, {r7, lr} 20 add r7, sp, #0 21 movs r3, r0, lsr #16 22 movne r3, #16 23 moveq r3, #0 24 movne r9, #0 25 moveq r9, #16 26 mov r3, r0, lsr r3 27 tst r3, #65280 28 movne r0, #8 29 moveq r0, #0 30 movne lr, #0 31 moveq lr, #8 32 mov r3, r3, lsr r0 33 tst r3, #240 34 movne r0, #4 35 moveq r0, #0 36 movne ip, #0 37 moveq ip, #4 38 mov r3, r3, lsr r0 39 tst r3, #12 40 movne r0, #2 41 moveq r0, #0 42 movne r1, #0 43 moveq r1, #2 44 mov r2, r3, lsr r0 45 add r3, lr, r9 46 add r0, r3, ip 47 add r1, r0, r1 48 mov r0, r2, lsr #1 49 eor r0, r0, #1 50 ands r0, r0, #1 51 mvnne r0, #0 52 rsb r3, r2, #2 53 and r0, r0, r3 54 add r0, r1, r0 55 ldmfd sp!, {r7, pc} 56