Bug 138685
| Summary: | gcc miscompiles numerical code (lapack) | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Dmitri A. Sergatskov <dasergatskov> |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED DUPLICATE | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | medium | ||
| Version: | 3 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | athlon | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-11-10 22:39:26 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20041020 Firefox/0.10.1 Description of problem: It appears that gcc in FC3 miscompiles numerical code. The problem appears to be with lapack libraries and can be demonstrated with octave (which uses them): [dima@localhost ~]$ octave GNU Octave, version 2.1.57 (i686-pc-linux-gnu). Copyright (C) 2004 John W. Eaton. .... octave:1> a=rand(100); octave:2> tic; eig(a); toc error: dgeev failed to converge octave:2> --------------- Sometimes it just hangs there for few minutes after which I kill it. I tried to compile octave myseelf agains ATLAS (different, optimized blas/lapack implementation) libraries, which I compile myself as well. The result was the same. I also tried different versions of octave. This al works on RHEL3, RH9, FC2, FC1. It is possible that the problem is actually with glibc. I was not able to recompile octave with gcc33 to check that. Version-Release number of selected component (if applicable): gcc version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3) How reproducible: Always Steps to Reproduce: 1. start octave 2. type at the octave prompt as shown 3. Actual Results: octave hangs or gives an error Expected Results: "0.004" (may vary slightly) -- this is 4 msec that it took the code to run on FC2. Additional info: this is on athlon/xp 2000MHz/500Meg.