newlib-cygwin/winsup/mingw/mingwex/complex/carg.c

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#include <complex.h>
double __attribute__ ((const)) carg (double _Complex _Z)
{
double res;
__asm__ ("fpatan;"
: "=t" (res) : "0" (__real__ _Z), "u" (__imag__ _Z) : "st(1)");
return res;
}