Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!apple!motcsd!hpda!hpcuhb!hpcllla!hpcllz2!dhandly From: dhandly@hpcllz2.HP.COM (Dennis Handly) Newsgroups: comp.sys.hp Subject: Re: extreme performance degradation in c compiler on HP9000/835 Message-ID: <3770023@hpcllz2.HP.COM> Date: 23 Sep 89 10:16:16 GMT References: <721@mit-amt.MEDIA.MIT.EDU> Organization: Hewlett Packard Calif. Language Lab Lines: 8 A similar question came up with a Fortran program. It looked like some relaxation techniques. The user took some of the SIN and COS function calls out of the look to see if it went faster? The end result was that with less function calls, it took longer. When I ran the same program on MPE XL, series 900, it aborted with an overflow. Using the +T option on HP-UX also caused the overflow. It turned out that the SIN and COS caused the result to be -1..+1