68 lines
871 B
C++
68 lines
871 B
C++
#include "libgcc.h"
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#include "kprintf.h"
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#include "assert.h"
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int64 __divdi3(int64 num, int64 den)
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{
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int minus = 0;
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int64 v;
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if ( num < 0 )
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{
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num = -num;
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minus = 1;
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}
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if ( den < 0 )
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{
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den = -den;
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minus ^= 1;
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}
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v = __udivmoddi4(num, den, 0);
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if ( minus )
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v = -v;
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return v;
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}
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uint64 __udivdi3(uint64 num, uint64 den)
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{
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return __udivmoddi4(num, den, 0);
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}
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uint64 __umoddi3(uint64 a, uint64 b)
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{
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uint64 r;
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__udivmoddi4(a, b, &r);
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return r;
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}
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uint64 __udivmoddi4(uint64 num, uint64 den, uint64 *rem_p)
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{
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uint64 quot = 0, qbit = 1;
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assert(den && "division by zero");
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while ( (int64)den >= 0 )
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{
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den <<= 1;
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qbit <<= 1;
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}
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while ( qbit )
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{
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if ( den <= num )
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{
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num -= den;
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quot += qbit;
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}
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den >>= 1;
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qbit >>= 1;
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}
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if ( rem_p )
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*rem_p = num;
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return quot;
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}
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