include/asm-mips/div64.h

   1 /*
   2  * Copyright (C) 2000 Maciej W. Rozycki
   3  * Copyright (C) 2003 Ralf Baechle
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  */
   9 #ifndef _ASM_DIV64_H
  10 #define _ASM_DIV64_H
  11
  12 #if (_MIPS_SZLONG == 32)
  13
  14 /*
  15  * No traps on overflows for any of these...
  16  */
  17
  18 #define do_div64_32(res, high, low, base) ({ \
  19         unsigned long __quot, __mod; \
  20         unsigned long __cf, __tmp, __tmp2, __i; \
  21         \
  22         __asm__(".set   push\n\t" \
  23                 ".set   noat\n\t" \
  24                 ".set   noreorder\n\t" \
  25                 "move   %2, $0\n\t" \
  26                 "move   %3, $0\n\t" \
  27                 "b      1f\n\t" \
  28                 " li    %4, 0x21\n" \
  29                 "0:\n\t" \
  30                 "sll    $1, %0, 0x1\n\t" \
  31                 "srl    %3, %0, 0x1f\n\t" \
  32                 "or     %0, $1, %5\n\t" \
  33                 "sll    %1, %1, 0x1\n\t" \
  34                 "sll    %2, %2, 0x1\n" \
  35                 "1:\n\t" \
  36                 "bnez   %3, 2f\n\t" \
  37                 " sltu  %5, %0, %z6\n\t" \
  38                 "bnez   %5, 3f\n" \
  39                 "2:\n\t" \
  40                 " addiu %4, %4, -1\n\t" \
  41                 "subu   %0, %0, %z6\n\t" \
  42                 "addiu  %2, %2, 1\n" \
  43                 "3:\n\t" \
  44                 "bnez   %4, 0b\n\t" \
  45                 " srl   %5, %1, 0x1f\n\t" \
  46                 ".set   pop" \
  47                 : "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
  48                   "=&r" (__i), "=&r" (__tmp2) \
  49                 : "Jr" (base), "0" (high), "1" (low)); \
  50         \
  51         (res) = __quot; \
  52         __mod; })
  53
  54 #define do_div(n, base) ({ \
  55         unsigned long long __quot; \
  56         unsigned long __mod; \
  57         unsigned long long __div; \
  58         unsigned long __upper, __low, __high, __base; \
  59         \
  60         __div = (n); \
  61         __base = (base); \
  62         \
  63         __high = __div >> 32; \
  64         __low = __div; \
  65         __upper = __high; \
  66         \
  67         if (__high) \
  68                 __asm__("divu   $0, %z2, %z3" \
  69                         : "=h" (__upper), "=l" (__high) \
  70                         : "Jr" (__high), "Jr" (__base)); \
  71         \
  72         __mod = do_div64_32(__low, __upper, __low, __base); \
  73         \
  74         __quot = __high; \
  75         __quot = __quot << 32 | __low; \
  76         (n) = __quot; \
  77         __mod; })
  78 #endif /* (_MIPS_SZLONG == 32) */
  79
  80 #if (_MIPS_SZLONG == 64)
  81
  82 /*
  83  * Don't use this one in new code
  84  */
  85 #define do_div64_32(res, high, low, base) ({ \
  86         unsigned int __quot, __mod; \
  87         unsigned long __div; \
  88         unsigned int __low, __high, __base; \
  89         \
  90         __high = (high); \
  91         __low = (low); \
  92         __div = __high; \
  93         __div = __div << 32 | __low; \
  94         __base = (base); \
  95         \
  96         __mod = __div % __base; \
  97         __div = __div / __base; \
  98         \
  99         __quot = __div; \
 100         (res) = __quot; \
 101         __mod; })
 102
 103 /*
 104  * Hey, we're already 64-bit, no
 105  * need to play games..
 106  */
 107 #define do_div(n, base) ({ \
 108         unsigned long __quot; \
 109         unsigned int __mod; \
 110         unsigned long __div; \
 111         unsigned int __base; \
 112         \
 113         __div = (n); \
 114         __base = (base); \
 115         \
 116         __mod = __div % __base; \
 117         __quot = __div / __base; \
 118         \
 119         (n) = __quot; \
 120         __mod; })
 121
 122 #endif /* (_MIPS_SZLONG == 64) */
 123
 124 #endif /* _ASM_DIV64_H */