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LAPACK la_constants will not compile

 
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simon



Joined: 05 Jul 2006
Posts: 294
PostPosted: Sun Mar 23, 2025 8:40 pm    Post subject: LAPACK la_constants will not compile Reply with quote
I am unsure at which compiler version this started, but using version 9, la_constants.f90 from LAPACK generates a compiler time error of "Divide by zero". The problem is reproduced in the following snippet:

Code:
module LA_CONSTANTS
!  Standard constants for
   integer, parameter :: sp = kind(1.e0)

   real(sp), parameter :: sone = 1.0_sp

!  Scaling constants
   real(sp), parameter :: sulp = epsilon(0._sp)
   real(sp), parameter :: ssafmin = real(radix(0._sp),sp)**max( &
      minexponent(0._sp)-1, &
      1-maxexponent(0._sp) &
   )
   real(sp), parameter :: ssafmax = sone / ssafmin
end module LA_CONSTANTS
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 8165
Location: Salford, UK
PostPosted: Mon Mar 24, 2025 8:14 am    Post subject: Reply with quote
Simon

This has now been fixed for the next release of FTN95.

In the mean time you can use tiny(sone) instead of ssafmin or use double precision.
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