-O generates NaN

[Haruhiko Okumura]

Hi,

Could someone tell why this code generates lots of NaN's when compiled
with any optimization flag (-O, -O2 etc) on?

$ g++ nan.cc         ... OK
$ g++ -O nan.cc      ... nan

$ g++ -v
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --enable-languages=c++,f77
gcc version 3.1 20010227 (experimental)

-- 
Haruhiko Okumura <okumura@matsusaka-u.ac.jp>
Matsusaka University, 1846 Kubo-cho, Matsusaka, 515-8511 Japan
Phone: +81-598-29-1122  Fax: +81-598-29-1014
http://www.matsusaka-u.ac.jp/~okumura/