Spacing -- floating point manipulation functions

Accelerated Computing HPC Compilers nvc, nvc++ and nvfortran
1

I found the only post about using the SPACING function 10 years ago noticeable numerical error - #4 by MatColgrove

When will Floating point manipulation functions support, such as spacing, be implemented?

This function is critically useful when applied in single precision gpu computing, , introduced in the fortran 90 standard.

2

I believe we’ve supported SPACING since we started supporting F90, which is was sometime in the mid-2000s. Also, I didn’t mention SPACING in my post, that was a user who posted after mine.

Is there a specific issue you’re encountering?

% cat spacing.f90
PROGRAM test_spacing
  INTEGER, PARAMETER :: SGL = SELECTED_REAL_KIND(p=6, r=37)
  INTEGER, PARAMETER :: DBL = SELECTED_REAL_KIND(p=13, r=200)

  WRITE(*,*) spacing(1.0_SGL)      ! "1.1920929E-07"          on i686
  WRITE(*,*) spacing(1.0_DBL)      ! "2.220446049250313E-016" on i686
END PROGRAM
% nvfortran spacing.f90 -V21.9; a.out
   1.1920929E-07
   2.2204460492503131E-016
3

Oh, I’m sorry. I didn’t find this function in the nvfortran manual and thought it wasn’t implemented.

4

We used to as part of our Fortran Reference Guide but stopped publishing this guide when we rebranded from PGI to NVHPC.

5

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