forked from Minki/linux
78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
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/* More subroutines needed by GCC output code on some machines. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC 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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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License.
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*/
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/* support functions required by the kernel. based on code from gcc-2.95.3 */
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/* I Molton 29/07/01 */
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#include "gcclib.h"
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#define umul_ppmm(xh, xl, a, b) \
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{register USItype __t0, __t1, __t2; \
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__asm__ ("%@ Inlined umul_ppmm \n\
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mov %2, %5, lsr #16 \n\
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mov %0, %6, lsr #16 \n\
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bic %3, %5, %2, lsl #16 \n\
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bic %4, %6, %0, lsl #16 \n\
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mul %1, %3, %4 \n\
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mul %4, %2, %4 \n\
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mul %3, %0, %3 \n\
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mul %0, %2, %0 \n\
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adds %3, %4, %3 \n\
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addcs %0, %0, #65536 \n\
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adds %1, %1, %3, lsl #16 \n\
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adc %0, %0, %3, lsr #16" \
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: "=&r" ((USItype) (xh)), \
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"=r" ((USItype) (xl)), \
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"=&r" (__t0), "=&r" (__t1), "=r" (__t2) \
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: "r" ((USItype) (a)), \
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"r" ((USItype) (b)));}
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#define __umulsidi3(u, v) \
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({DIunion __w; \
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umul_ppmm (__w.s.high, __w.s.low, u, v); \
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__w.ll; })
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DItype
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__muldi3 (DItype u, DItype v)
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{
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DIunion w;
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DIunion uu, vv;
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uu.ll = u,
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vv.ll = v;
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w.ll = __umulsidi3 (uu.s.low, vv.s.low);
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w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
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+ (USItype) uu.s.high * (USItype) vv.s.low);
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return w.ll;
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}
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