For integral complex types like complex int, GCC doesn't fold division with constant arguments. E.g. this testcase should evaluate at compile-time and link without any errors but doesn't:
extern void link_error(void); #define EXPR ((2 + 4i) / 2) int main(void) { if (__real EXPR != 1 || __imag EXPR != 2) link_error(); return 0; } -- Summary: GCC doesn't fold complex int division Product: gcc Version: 4.5.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: ghazi at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41435