If I understand your results correctly, the left image is that produced
by the binary compiled with the specified options, the middle image is the
difference-image with a reference (presumably calculated with the official
binary for Linux?) and the right image is the inverted difference.  Correct?

> Well, '-unroll-loops' kills. Images. :)

	From you results it seems that it's actually -ffast-math that changes the
result of the top-left corner (your last test shows that -funroll-loops does
produce a correct image).  But what is really strange is your second result:
a distorted image is also produced with -march=i686 ???  Hard to believe...

	In any case, on an Intel Pentium 4 or higher processor, it is clear again
that one should use ICC to compile POV from sources.

	- NC

Post a reply to this message