File: negative_stride_1.f90

package info (click to toggle)
gcc-arm-none-eabi 15%3A12.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 959,712 kB
  • sloc: cpp: 3,275,382; ansic: 2,061,766; ada: 840,956; f90: 208,513; makefile: 76,132; asm: 73,433; xml: 50,448; exp: 34,146; sh: 32,436; objc: 15,637; fortran: 14,012; python: 11,991; pascal: 6,787; awk: 4,779; perl: 3,054; yacc: 338; ml: 285; lex: 201; haskell: 122
file content (25 lines) | stat: -rw-r--r-- 806 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
! { dg-do run }
!
! PR fortran/102043
! The middle-end used to conclude from array indexing that the index
! should be non-negative and thus that array accesses to reversed arrays
! (i.e. with negative strides) only access the last element of the array,
! as the access involves a pointer to array that is initialized to point
! to the last element in the case of a reversed array.

program main
   implicit none
   integer :: a(3, 3)
   integer :: i
   a = 0
   call s(a(3:1:-1,:))
   if (any(a(:,1) /= (/  7,  5,  3 /))) stop 1
   if (any(a(:,2) /= (/ 17, 13, 11 /))) stop 2
   if (any(a(:,3) /= (/ 29, 23, 19 /))) stop 3
contains
  subroutine s(b)
    implicit none
    integer, dimension(:,:) :: b
    b = reshape((/ 3, 5, 7, 11, 13, 17, 19, 23, 29 /), (/ 3, 3 /)) 
  end subroutine s
end program main