1 /* Acess GCC Helper Library
14 void __stack_chk_fail()
16 write(2, 32, "FATAL ERROR: Stack Check Failed\n");
21 // --- 64-Bit Math ---
23 * \fn uint64_t __udivdi3(uint64_t Num, uint64_t Den)
24 * \brief Divide two 64-bit integers
26 uint64_t __udivdi3(uint64_t Num, uint64_t Den)
30 if(Den == 0) // Call Div by Zero Error
31 __asm__ __volatile__ ("int $0");
33 if(Den == 1) return Num;
34 if(Den == 2) return Num >> 1;
35 if(Den == 4) return Num >> 2;
36 if(Den == 8) return Num >> 3;
37 if(Den == 16) return Num >> 4;
38 if(Den == 32) return Num >> 5;
39 if(Den == 64) return Num >> 6;
40 if(Den == 128) return Num >> 7;
41 if(Den == 256) return Num >> 8;
52 if(Den == 0) __asm__ __volatile__ ("int $0x0");
54 if(Num <= 0xFFFFFFFF && Den <= 0xFFFFFFFF)
56 if(Den == 1) return Num;
57 if(Den == 2) return Num >> 1;
58 if(Den == 16) return Num >> 4;
59 if(Num < Den) return 0;
60 if(Num == Den) return 1;
61 if(Num == Den*2) return 2;
63 // Non-restoring division, from wikipedia
64 // http://en.wikipedia.org/wiki/Division_(digital)
66 for( i = 0; i < 64; i ++ )
69 q |= (uint64_t)1 << (63-i);
70 P[i+1] = 2*P[i] - Den;
74 P[i+1] = 2*P[i] + Den;
87 * \fn uint64_t __umoddi3(uint64_t Num, uint64_t Den)
88 * \brief Get the modulus of two 64-bit integers
90 uint64_t __umoddi3(uint64_t Num, uint64_t Den)
93 if(Den == 0) __asm__ __volatile__ ("int $0"); // Call Div by Zero Error
95 if(Den == 1) return 0;
96 if(Den == 2) return Num & 0x01;
97 if(Den == 4) return Num & 0x03;
98 if(Den == 8) return Num & 0x07;
99 if(Den == 16) return Num & 0x0F;
100 if(Den == 32) return Num & 0x1F;
101 if(Den == 64) return Num & 0x3F;
102 if(Den == 128) return Num & 0x3F;
103 if(Den == 256) return Num & 0x7F;
105 while(Num >= Den) Num -= Den;
109 if(Den == 0) __asm__ __volatile__ ("int $0"); // Call Div by Zero Error
112 if(Num < Den) return Num;
113 if(Num == Den) return 0;
114 if(Num <= 0xFFFFFFFF && Den <= 0xFFFFFFFF)
117 // Speedups for common operations
118 if(Den == 1) return 0;
119 if(Den == 2) return Num & 0x01;
120 if(Den == 8) return Num & 0x07;
121 if(Den == 16) return Num & 0x0F;
122 return Num - __udivdi3(Num, Den) * Den;