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jeremybenn |
! { dg-do run }
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! { dg-options "-std=gnu" }
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! Tests the fix for PR29786, in which initialization of overlapping
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! equivalence elements caused a compile error.
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!
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! Contributed by Bernhard Fischer
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!
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block data
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common /global/ ca (4)
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integer(4) ca, cb
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equivalence (cb, ca(3))
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data (ca(i), i = 1, 2) /42,43/, ca(4) /44/
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data cb /99/
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end block data
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integer(4), parameter :: abcd = ichar ("a") + 256_4 * (ichar("b") + 256_4 * &
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(ichar ("c") + 256_4 * ichar ("d")))
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logical(4), parameter :: bigendian = transfer (abcd, "wxyz") .eq. "abcd"
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call int4_int4
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call real4_real4
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call complex_real
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call check_block_data
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call derived_types ! Thanks to Tobias Burnus for this:)
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!
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! This came up in PR29786 comment #9 - Note the need to treat endianess
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! Thanks Dominique d'Humieres:)
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!
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if (bigendian) then
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if (d1mach_little (1) .ne. transfer ((/0_4, 1048576_4/), 1d0)) call abort ()
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if (d1mach_little (2) .ne. transfer ((/-1_4,2146435071_4/), 1d0)) call abort ()
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else
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if (d1mach_big (1) .ne. transfer ((/1048576_4, 0_4/), 1d0)) call abort ()
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if (d1mach_big (2) .ne. transfer ((/2146435071_4,-1_4/), 1d0)) call abort ()
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end if
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!
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contains
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subroutine int4_int4
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integer(4) a(4)
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integer(4) b
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equivalence (b,a(3))
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data b/3/
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data (a(i), i=1,2) /1,2/, a(4) /4/
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if (any (a .ne. (/1, 2, 3, 4/))) call abort ()
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end subroutine int4_int4
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subroutine real4_real4
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real(4) a(4)
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real(4) b
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equivalence (b,a(3))
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data b/3.0_4/
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data (a(i), i=1,2) /1.0_4, 2.0_4/, &
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a(4) /4.0_4/
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if (sum (abs (a - &
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(/1.0_4, 2.0_4, 3.0_4, 4.0_4/))) > 1.0e-6) call abort ()
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end subroutine real4_real4
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subroutine complex_real
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complex(4) a(4)
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real(4) b(2)
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equivalence (b,a(3))
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data b(1)/3.0_4/, b(2)/4.0_4/
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data (a(i), i=1,2) /(0.0_4, 1.0_4),(2.0_4,0.0_4)/, &
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a(4) /(0.0_4,5.0_4)/
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if (sum (abs (a - (/(0.0_4, 1.0_4),(2.0_4, 0.0_4), &
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(3.0_4, 4.0_4),(0.0_4, 5.0_4)/))) > 1.0e-6) call abort ()
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end subroutine complex_real
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subroutine check_block_data
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common /global/ ca (4)
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equivalence (ca(3), cb)
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integer(4) ca
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if (any (ca .ne. (/42, 43, 99, 44/))) call abort ()
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end subroutine check_block_data
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function d1mach_little(i) result(d1mach)
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implicit none
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double precision d1mach,dmach(5)
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integer i
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integer*4 large(4),small(4)
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equivalence ( dmach(1), small(1) )
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equivalence ( dmach(2), large(1) )
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data small(1),small(2) / 0, 1048576/
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data large(1),large(2) /-1,2146435071/
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d1mach = dmach(i)
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end function d1mach_little
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function d1mach_big(i) result(d1mach)
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implicit none
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double precision d1mach,dmach(5)
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integer i
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integer*4 large(4),small(4)
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equivalence ( dmach(1), small(1) )
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equivalence ( dmach(2), large(1) )
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data small(1),small(2) /1048576, 0/
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data large(1),large(2) /2146435071,-1/
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d1mach = dmach(i)
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end function d1mach_big
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subroutine derived_types
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TYPE T1
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sequence
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character (3) :: chr
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integer :: i = 1
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integer :: j
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END TYPE T1
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TYPE T2
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sequence
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character (3) :: chr = "wxy"
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integer :: i = 1
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integer :: j = 4
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END TYPE T2
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TYPE(T1) :: a1
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TYPE(T2) :: a2
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EQUIVALENCE(a1,a2) ! { dg-warning="mixed|components" }
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if (a1%chr .ne. "wxy") call abort ()
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if (a1%i .ne. 1) call abort ()
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if (a1%j .ne. 4) call abort ()
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end subroutine derived_types
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end
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