| Issue |
132603
|
| Summary |
[Flang][Question] compiling with -fstack-arrays option
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
k-arrows
|
Consider the following program.
```f90
program test
real :: Q(8, 8)
integer :: i, j
do i = 1, 8
do j = 1, 8
Q(i, j) = i*j + i + j + 1
end do
end do
call qradd_Rdiag(Q, 1)
do i = 1, 8
print *, Q(:, i)
end do
contains
function matprod(Q, G) result(R)
real, intent(in) :: Q(:, :), G(:, :)
real :: R(size(Q, 1), size(G, 2))
R = 1.0
end function
subroutine qradd_Rdiag(Q, n)
integer(4), intent(in) :: n
real(4), intent(inout) :: Q(:, :)
integer(4) :: k
integer(4) :: m
real(4) :: G(2, 2)
m = int(size(Q, 2), kind(m))
do k = m - 1_4, n + 1_4, -1
Q(:, [k, k + 1_4]) = matprod(Q(:, [k, k + 1_4]), transpose(G))
end do
end subroutine qradd_Rdiag
end program
```
The execution result of the above program changes depending on whether -fstack-arrays is specified at compile time (reproducible on Godbolt).
https://godbolt.org/z/nbb8ebWxh
Am I using this option incorrectly?
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