[Bug fortran/104483] New: Multiplication of huge and small numbers

[shaydin at ktu dot edu.tr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104483

            Bug ID: 104483
           Summary: Multiplication of huge and small numbers
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaydin at ktu dot edu.tr
  Target Milestone: ---

Created attachment 52402
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52402&action=edit
Simple Fortran Code

As in the attached file, I am testing the multiplication of very large and
small decimal placed numbers for different real kinds. But the results are
different and the most strange point is the decimal part is lost for the quad
(real*16) version. I want to learn what is the problem and where is my mistake.