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59 lines
2.0 KiB
ArmAsm
59 lines
2.0 KiB
ArmAsm
// Copyright 2005-2014 Intel Corporation. All Rights Reserved.
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//
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// This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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// you can redistribute it and/or modify it under the terms of the GNU General Public License
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// version 2 as published by the Free Software Foundation. Threading Building Blocks is
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// distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details. You should have received a copy of
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// the GNU General Public License along with Threading Building Blocks; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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// As a special exception, you may use this file as part of a free software library without
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// restriction. Specifically, if other files instantiate templates or use macros or inline
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// functions from this file, or you compile this file and link it with other files to produce
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// an executable, this file does not by itself cause the resulting executable to be covered
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// by the GNU General Public License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General Public License.
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.section .text
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.align 16
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// unsigned long __TBB_machine_lg( unsigned long x );
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// r32 = x
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.proc __TBB_machine_lg#
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.global __TBB_machine_lg#
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__TBB_machine_lg:
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shr r16=r32,1 // .x
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;;
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shr r17=r32,2 // ..x
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or r32=r32,r16 // xx
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;;
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shr r16=r32,3 // ...xx
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or r32=r32,r17 // xxx
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;;
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shr r17=r32,5 // .....xxx
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or r32=r32,r16 // xxxxx
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;;
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shr r16=r32,8 // ........xxxxx
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or r32=r32,r17 // xxxxxxxx
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;;
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shr r17=r32,13
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or r32=r32,r16 // 13x
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;;
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shr r16=r32,21
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or r32=r32,r17 // 21x
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;;
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shr r17=r32,34
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or r32=r32,r16 // 34x
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;;
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shr r16=r32,55
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or r32=r32,r17 // 55x
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;;
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or r32=r32,r16 // 64x
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;;
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popcnt r8=r32
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;;
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add r8=-1,r8
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br.ret.sptk.many b0
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.endp __TBB_machine_lg#
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