good first issue
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説明
https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html
Adding support for mul and div would be a good start.
Runtime Function: complex float __mulsc3 (float a, float b, float c, float d)
Runtime Function: complex double __muldc3 (double a, double b, double c, double d)
Runtime Function: complex long double __multc3 (long double a, long double b, long double c, long double d)
Runtime Function: complex long double __mulxc3 (long double a, long double b, long double c, long double d)
These functions return the product of a + ib and c + id, following the rules of C99 Annex G.
Runtime Function: complex float __divsc3 (float a, float b, float c, float d)
Runtime Function: complex double __divdc3 (double a, double b, double c, double d)
Runtime Function: complex long double __divtc3 (long double a, long double b, long double c, long double d)
Runtime Function: complex long double __divxc3 (long double a, long double b, long double c, long double d)
These functions return the quotient of a + ib and c + id (i.e., (a + ib) / (c + id)), following the rules of C99 Annex G.