diff options
Diffstat (limited to 'gcc/f/runtime/libF77/z_div.c')
-rw-r--r-- | gcc/f/runtime/libF77/z_div.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gcc/f/runtime/libF77/z_div.c b/gcc/f/runtime/libF77/z_div.c new file mode 100644 index 00000000000..4a987ab255a --- /dev/null +++ b/gcc/f/runtime/libF77/z_div.c @@ -0,0 +1,39 @@ +#include "f2c.h" + +#ifdef KR_headers +extern VOID sig_die(); +VOID z_div(resx, a, b) doublecomplex *a, *b, *resx; +#else +extern void sig_die(char*, int); +void z_div(doublecomplex *resx, doublecomplex *a, doublecomplex *b) +#endif +{ +double ratio, den; +double abr, abi; +doublecomplex res; + +if( (abr = b->r) < 0.) + abr = - abr; +if( (abi = b->i) < 0.) + abi = - abi; +if( abr <= abi ) + { + if(abi == 0) + sig_die("complex division by zero", 1); + ratio = b->r / b->i ; + den = b->i * (1 + ratio*ratio); + res.r = (a->r*ratio + a->i) / den; + res.i = (a->i*ratio - a->r) / den; + } + +else + { + ratio = b->i / b->r ; + den = b->r * (1 + ratio*ratio); + res.r = (a->r + a->i*ratio) / den; + res.i = (a->i - a->r*ratio) / den; + } + +resx->r = res.r; +resx->i = res.i; +} |