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This C program produces different results with -O0 and -O3 optimization levels. #include <stdio.h> float test(unsigned int arg) { return (float)((int)(arg * 58)) + 1; } int main() { printf("%d\n", (int)test((unsigned int)-831710640)); } O0 result is -994576896 O3 result is -994576832 It happens because LLVM (specifically instcombine) does the following transformation:

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