31 Mar 1997 15:23:07 -0500

Related articles |
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Reduction of Strength and Polynomials ilja@wi.leidenuniv.nl (Ilja Heitlager) (1997-03-27) |

Re: Reduction of Strength and Polynomials n8tm@aol.com (1997-03-31) |

From: | n8tm@aol.com (N8TM) |

Newsgroups: | comp.compilers |

Date: | 31 Mar 1997 15:23:07 -0500 |

Organization: | AOL http://www.aol.com |

References: | 97-03-147 |

Keywords: | optimize, arithmetic |

Several compilers expand the terms of a polynomial and take advantage

of common factors. However, I have never seen anything which would

use distributive properties to change the order of addition and

multiplication> Compilers which ignore parentheses (IRIX

-OPT:roundoff=2) don't seem to have any good reason for the order of

addition and subtraction which they choose. It seems that if you know

the way you want it done, you must dictate it with parentheses and

avoid compiler options which defeat them.

Tim

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