div64.h

Go to the documentation of this file.

/*
 * Copyright (C) 2000, 2004  Maciej W. Rozycki
 * Copyright (C) 2003, 07 Ralf Baechle ([email protected])
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#ifndef __ASM_DIV64_H
#define __ASM_DIV64_H

#include <asm-generic/div64.h>

#if BITS_PER_LONG == 64

#include <linux/types.h>

/*
 * No traps on overflows for any of these...
 */

#define __div64_32(n, base)                     \
({                                  \
    unsigned long __cf, __tmp, __tmp2, __i;             \
    unsigned long __quot32, __mod32;                \
    unsigned long __high, __low;                    \
    unsigned long long __n;                     \
                                    \
    __high = *__n >> 32;                        \
    __low = __n;                            \
    __asm__(                            \
    "   .set    push                    \n" \
    "   .set    noat                    \n" \
    "   .set    noreorder               \n" \
    "   move    %2, $0                  \n" \
    "   move    %3, $0                  \n" \
    "   b   1f                  \n" \
    "    li %4, 0x21                \n" \
    "0:                         \n" \
    "   sll $1, %0, 0x1             \n" \
    "   srl %3, %0, 0x1f                \n" \
    "   or  %0, $1, %5              \n" \
    "   sll %1, %1, 0x1             \n" \
    "   sll %2, %2, 0x1             \n" \
    "1:                         \n" \
    "   bnez    %3, 2f                  \n" \
    "    sltu   %5, %0, %z6             \n" \
    "   bnez    %5, 3f                  \n" \
    "2:                         \n" \
    "    addiu  %4, %4, -1              \n" \
    "   subu    %0, %0, %z6             \n" \
    "   addiu   %2, %2, 1               \n" \
    "3:                         \n" \
    "   bnez    %4, 0b\n\t"                 \
    "    srl    %5, %1, 0x1f\n\t"               \
    "   .set    pop"                        \
    : "=&r" (__mod32), "=&r" (__tmp),               \
      "=&r" (__quot32), "=&r" (__cf),               \
      "=&r" (__i), "=&r" (__tmp2)                   \
    : "Jr" (base), "0" (__high), "1" (__low));          \
                                    \
    (__n) = __quot32;                       \
    __mod32;                            \
})

#endif /* BITS_PER_LONG == 64 */

#endif /* __ASM_DIV64_H */