https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84931
kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-18
Ever confirmed|0 |1
--- Comment #1 from kargl at gcc dot gnu.org ---
The following code does the correct thing with an
integer array 'y'.
program test
implicit none
integer, parameter :: n = 65536
integer, dimension(n) :: y
integer*4 :: i
y = (/ (1, i=1, n) /)
if (y(2) /= 1) stop 1
end program test
The expansion of the array constructor is implemented by
creating a temporary array and filling it with '1'. The
temporary array is then copied into 'y'.
This however does sideways
program test
implicit none
integer, parameter :: n = 65536
real, dimension(n) :: y
integer*4 :: i
y = (/ (1, i=1, n) /)
if (y(2) /= 1) stop 1
end program test
A temporary array is created, but only the first element of
the temporary array is initialized to 1. The temporary array
is then copied into 'y', except the temporary array has not
assigned values for tmp(2:65536).
Tree dumps are here
https://gcc.gnu.org/ml/fortran/2018-03/msg00096.html
Problem found on Stack Overflow
https://stackoverflow.com/questions/49330816/strange-initialization-behavior-for-an-array-constructor-with-implied-do-in-gfor
