From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26909 invoked by alias); 17 Nov 2007 00:08:08 -0000 Received: (qmail 26840 invoked by uid 48); 17 Nov 2007 00:07:55 -0000 Date: Sat, 17 Nov 2007 00:08:00 -0000 Message-ID: <20071117000755.26839.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug fortran/34128] slow gfortran 4.x (library?) compared to g77 3.4 In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "fxcoudert at gcc dot gnu dot org" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2007-11/txt/msg01589.txt.bz2 ------- Comment #1 from fxcoudert at gcc dot gnu dot org 2007-11-17 00:07 ------- While I'm trying to understand what happens, I should say that a simply workaround is to make your calculation happen in double precision (change "3.14159" into "3.14159d0"; after all, you want a double-precision result). g77 called sin() to perform the calculation, while gfortran calls sinf(). And sinf() happens to be way slower than sin() (I wonder why!). Maybe a bugreport to glibc will be in order here. -- fxcoudert at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fxcoudert at gcc dot gnu dot | |org Status|UNCONFIRMED |NEW Component|libfortran |fortran Ever Confirmed|0 |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2007-11-17 00:07:55 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34128