[Bug 217603] Review Request: tachyon - Parallel / Multiprocessor Ray Tracing System

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Summary: Review Request: tachyon - Parallel / Multiprocessor Ray Tracing System


https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=217603





------- Additional Comments From mtasaka at ioa.s.u-tokyo.ac.jp  2006-11-29 08:42 EST -------
As I said in comment #1, both optimizations make debugging very
difficult.

* The former one (-fomit-frame-pointer) may make it impossible to
  debug by gdb.
  http://sources.redhat.com/gdb/current/onlinedocs/gdb_7.html
* -ffast-math equals
　　-fno-math-errno
　　-funsafe-math-optimizations
　　-fno-trapping-math
　　-ffinite-math-only
　　-fno-signaling-nans
   i.e.
   1. this optimization means that you trust that there is no mistake
      like 'taking root of negative number' or so, which is very risky.
   2. I don't know if this program needs accuracy, however, 
      -funsafe-math-optimizations usually decreases precision of floating
      point calculation.

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