[Bug fortran/39087] New: Performance using COMPLEX data type

Tue, 03 Feb 2009 07:44:12 -0800 

I have noticed that in some cases - especially calculating Mandelbrot Fractals
there is a severe performance penalty if the COMPLEX data type is used instead
of plain variables.

It's nothing wrong with the calculation, but it shall be noted that it can mean
a severe performance penalty if the COMPLEX data type is used.

Result of test cases I have created:
---
[r...@cvs2 frac]# time ./m6

real    0m5.806s
user    0m1.705s
sys     0m0.032s
[r...@cvs2 frac]# time ./m7

real    0m18.598s
user    0m12.469s
sys     0m0.036s

---


-- 
           Summary: Performance using COMPLEX data type
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: m4341 at abc dot se


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39087

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