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extern void abort (void); long long f (long long a, long long b) { return ((a + b) << 32) >> 32; } long long a = 0x1234567876543210LL; long long b = 0x2345678765432101LL; long long c = ((0x1234567876543210LL + 0x2345678765432101LL) << 32) >> 32; int main () { if (f (a, b) != c) abort (); return 0; }