[Proj] pj_transform performance issue

Greg Troxel gdt at ir.bbn.com
Mon Nov 12 10:29:43 EST 2007

  Now, if I pass the coordiantes of my intermediate function, by address
  instead of by values,
  int trans(projPJ pj_in, projPJ pj_out, double *x, double *y)
  pj_transform(pj_in, pj_out, 1, 0, x, y, 0);
  We get the result in 6 seconds again.

Such a high time difference doesn't make sense.  I think you need to
read the assembly language that the compiler is generating.  If you are
using gcc, use -S on the compilation line to have it leave the .s.

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