------- Comment #3 from rakdver at gcc dot gnu dot org 2007-06-01 23:13 ------- (In reply to comment #2) > Is that OK to transform > > float sf; > ... > sf = 500 * sf; > for (i = 0; i < ceplen; i++) > sum[i] *= sf; > > to > > for (i = 0; i < ceplen; i++) > sum[i] = (sum[i]* 500)*sf; > > You can certainly get the different results when sf is small and sum[i] is > large.
with -ffast-math, this transformation is ok (although it does not seem to make sense to do it, it moves a multiplication into a loop). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183
