Compilare: user.cpp: In function ‘void CountingSort(u32*, u32*, u32)’: user.cpp:18:73: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(u32 i = 0x0; i != 0x800; index[++i] = index[~-i] + frequence[~-i]); ^ user.cpp:18:73: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: In function ‘i32 main()’: user.cpp:48:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x367C2DC9; ^ user.cpp:55:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x7CE67EF6; ^ user.cpp:62:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x6F6E4E7B; ^ user.cpp:69:53: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0xF4240; ^ user.cpp:76:53: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x65759; ^ user.cpp:83:47: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % C; ^ user.cpp: At global scope: user.cpp:25:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void write(u32 x) ^ user.cpp:12:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void CountingSort(u32 A[], u32 B[], u32 digit) ^ user.cpp: In function ‘void CountingSort(u32*, u32*, u32)’: user.cpp:18:5: warning: iteration 2047u invokes undefined behavior [-Waggressive-loop-optimizations] for(u32 i = 0x0; i != 0x800; index[++i] = index[~-i] + frequence[~-i]); ^ user.cpp:18:24: note: containing loop for(u32 i = 0x0; i != 0x800; index[++i] = index[~-i] + frequence[~-i]); ^