http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49302
--- Comment #8 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2011-06-07 20:25:20 UTC --- Because the compile uses -O0 and the link uses -O2 -ffast-math, we have a mismatch of expectations. With -O0 and no -ffast-math, builtin cabs isn't folded into sqrt(pow+pow) during parsing. With -O2 -ffast-math, we expect all pow's to have been exposed before cse_sincos, but the folding doesn't have a chance to occur until PRE. It seems odd to use a -O0 compile when we're going to force a -O2 link, but assuming that's WAD, then I agree with adding a cabs fold in cse_sincos. I can work on that. I assume we don't want to mirror the other folds from builtins.c:fold_builtin_cabs, as this is just a matter of ensuring things compile correctly with -O0 -lto.
