/* * This file is used to test combinations of eliminable cast * operations to ensure that the logic in InstCombine is correct. */ #include #include int main(int argc, char**argv) { int testVal = 42; int i; if (argc > 1) testVal = atoi(argv[1]); printf("testVal = %d\n", testVal); // First check for elimination of A -> B -> C type casts. // Make sure the loop goes through 256 values to catch at // least some single byte signed issues. for (i = -128+testVal; i < 128+testVal; ++i) { #define TRIPLECAST(num, first, second, third) \ { \ first X = (first) num; \ second Y = (second) X; \ third Z = (third) Y; \ printf("Test %d(%s) -> %s -> %s = %d\n", \ num, #first, #second, #third,(int)Z); \ } // Test same size with sign rotation TRIPLECAST(i, unsigned char, unsigned char, unsigned char); TRIPLECAST(i, unsigned char, unsigned char, signed char); TRIPLECAST(i, unsigned char, signed char, unsigned char); TRIPLECAST(i, unsigned char, signed char, signed char); TRIPLECAST(i, signed char, unsigned char, unsigned char); TRIPLECAST(i, signed char, unsigned char, signed char); TRIPLECAST(i, signed char, signed char, unsigned char); TRIPLECAST(i, signed char, signed char, signed char); TRIPLECAST(i, unsigned short, unsigned short, unsigned short); TRIPLECAST(i, unsigned short, unsigned short, signed short); TRIPLECAST(i, unsigned short, signed short, unsigned short); TRIPLECAST(i, unsigned short, signed short, signed short); TRIPLECAST(i, signed short, unsigned short, unsigned short); TRIPLECAST(i, signed short, unsigned short, signed short); TRIPLECAST(i, signed short, signed short, unsigned short); TRIPLECAST(i, signed short, signed short, signed short); TRIPLECAST(i, unsigned int, unsigned int, unsigned int); TRIPLECAST(i, unsigned int, unsigned int, signed int); TRIPLECAST(i, unsigned int, signed int, unsigned int); TRIPLECAST(i, unsigned int, signed int, signed int); TRIPLECAST(i, signed int, unsigned int, unsigned int); TRIPLECAST(i, signed int, unsigned int, signed int); TRIPLECAST(i, signed int, signed int, unsigned int); TRIPLECAST(i, signed int, signed int, signed int); TRIPLECAST(i, unsigned long long, unsigned long long, unsigned long long); TRIPLECAST(i, unsigned long long, unsigned long long, signed long long); TRIPLECAST(i, unsigned long long, signed long long, unsigned long long); TRIPLECAST(i, unsigned long long, signed long long, signed long long); TRIPLECAST(i, signed long long, unsigned long long, unsigned long long); TRIPLECAST(i, signed long long, unsigned long long, signed long long); TRIPLECAST(i, signed long long, signed long long, unsigned long long); TRIPLECAST(i, signed long long, signed long long, signed long long); // Same size through larger size TRIPLECAST(i, unsigned char, unsigned short, unsigned char); TRIPLECAST(i, unsigned char, unsigned short, signed char); TRIPLECAST(i, unsigned char, signed short, unsigned char); TRIPLECAST(i, unsigned char, signed short, signed char); TRIPLECAST(i, signed char, unsigned short, unsigned char); TRIPLECAST(i, signed char, unsigned short, signed char); TRIPLECAST(i, signed char, signed short, unsigned char); TRIPLECAST(i, signed char, signed short, signed char); TRIPLECAST(i, unsigned short, unsigned int, unsigned short); TRIPLECAST(i, unsigned short, unsigned int, signed short); TRIPLECAST(i, unsigned short, signed int, unsigned short); TRIPLECAST(i, unsigned short, signed int, signed short); TRIPLECAST(i, signed short, unsigned int, unsigned short); TRIPLECAST(i, signed short, unsigned int, signed short); TRIPLECAST(i, signed short, signed int, unsigned short); TRIPLECAST(i, signed short, signed int, signed short); TRIPLECAST(i, unsigned int, unsigned long long, unsigned int); TRIPLECAST(i, unsigned int, unsigned long long, signed int); TRIPLECAST(i, unsigned int, signed long long, unsigned int); TRIPLECAST(i, unsigned int, signed long long, signed int); TRIPLECAST(i, signed int, unsigned long long, unsigned int); TRIPLECAST(i, signed int, unsigned long long, signed int); TRIPLECAST(i, signed int, signed long long, unsigned int); TRIPLECAST(i, signed int, signed long long, signed int); // Larger size through smaller size TRIPLECAST(i, unsigned short, unsigned char, unsigned short); TRIPLECAST(i, unsigned short, unsigned char, signed short); TRIPLECAST(i, unsigned short, signed char, unsigned short); TRIPLECAST(i, unsigned short, signed char, signed short); TRIPLECAST(i, signed short, unsigned char, unsigned short); TRIPLECAST(i, signed short, unsigned char, signed short); TRIPLECAST(i, signed short, signed char, unsigned short); TRIPLECAST(i, signed short, signed char, signed short); TRIPLECAST(i, unsigned int, unsigned short, unsigned int); TRIPLECAST(i, unsigned int, unsigned short, signed int); TRIPLECAST(i, unsigned int, signed short, unsigned int); TRIPLECAST(i, unsigned int, signed short, signed int); TRIPLECAST(i, signed int, unsigned short, unsigned int); TRIPLECAST(i, signed int, unsigned short, signed int); TRIPLECAST(i, signed int, signed short, unsigned int); TRIPLECAST(i, signed int, signed short, signed int); TRIPLECAST(i, unsigned long long, unsigned int, unsigned long long); TRIPLECAST(i, unsigned long long, unsigned int, signed long long); TRIPLECAST(i, unsigned long long, signed int, unsigned long long); TRIPLECAST(i, unsigned long long, signed int, signed long long); TRIPLECAST(i, signed long long, unsigned int, unsigned long long); TRIPLECAST(i, signed long long, unsigned int, signed long long); TRIPLECAST(i, signed long long, signed int, unsigned long long); TRIPLECAST(i, signed long long, signed int, signed long long); } // Check cast to bool #define CASTTOBOOL(num, type) \ { \ type Y = (type) num; \ bool X = (bool) num; \ printf("%d(%s) -> bool = %d\n", num, #type, (int)X); \ } CASTTOBOOL(testVal, float); CASTTOBOOL(testVal, long long); CASTTOBOOL(testVal, unsigned int); CASTTOBOOL(testVal, signed char); CASTTOBOOL(testVal, bool); // Check useless getelementptr { static int sillyArray[8] = { 2, 3, 5, 7, 11, 13, 17, 19 }; int* i_ptr = &sillyArray[ 0 ]; long long* l_ptr = (long long*) i_ptr; printf("%lld\n", *l_ptr); } // Cast of malloc result to another type { // Note: must use volatile, otherwise g++ miscompiles at -O2 (but not LLVM) volatile float* float_ptr = (float*) malloc(sizeof(unsigned)); *float_ptr = 10; volatile unsigned* unsigned_ptr = (volatile unsigned*) float_ptr; printf("%x\n", *unsigned_ptr); } // Propagation of single-use casts into other instructions { } return 0; }