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/* |
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* PearPC |
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* ppc_tools.h |
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* |
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* Copyright (C) 2003 Sebastian Biallas (sb@biallas.net) |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#ifndef __PPC_TOOLS_H__ |
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#define __PPC_TOOLS_H__ |
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|
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#include "system/arch/sysendian.h" |
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|
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static inline __attribute__((const)) bool ppc_carry_3(uint32 a, uint32 b, uint32 c) |
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{ |
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register uint8 t; |
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asm ( |
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"addl %2, %1\n\t" |
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"setc %0\n\t" |
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"addl %3, %1\n\t" |
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"adcb $0, %0" |
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: "=&q" (t), "+&r" (a) |
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: "g" (b), "g" (c) |
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); |
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return t; |
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} |
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/* |
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equivalent C-construction: |
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static inline __attribute__((const)) bool ppc_carry_3(uint32 a, uint32 b, uint32 c) |
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{ |
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if ((a+b) < a) { |
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return true; |
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} |
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if ((a+b+c) < c) { |
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return true; |
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} |
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return false; |
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} |
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*/ |
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|
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static inline __attribute__((const)) uint32 ppc_word_rotl(uint32 data, int n) |
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{ |
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n &= 0x1f; |
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return (data << n) | (data >> (32-n)); |
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} |
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|
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#endif |