1.0d0 stored as integer?

I am trying to come up with an explanation for the following behavior. Setting a real*8 variable to 1.0d0 somehow creates a memory allocation in which only the single digit "1" is stored. Can anyone explain why?

Thanks.
-david

! gdb will not display all digits of the variable x1
! When run, the output is:
! x1: 1.00000000000000
! x2: 1.12345678901235
!
! But in gdb or totalview, only "1" is displayed:
! Local variables:
! x2: 1.12345678901235
! x1: 1

program test1

real*8 :: x1, x2

x1 = 1.0d0
x2 = 1.1234567890123456789d0

write(*,*) "x1: ", x1
write(*,*) "x2: ", x2

end program test1

.

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