dbx recognizes Fortran intrinsic functions. Note that for SPARC Linux platforms, Fortran intrinsic functions are not supported.
To show an intrinsic function in dbx:
demo% cat ShowIntrinsic.f
INTEGER i
i = -2
END
(dbx) stop in MAIN
(2) stop in MAIN
(dbx) run
Running: shi
(process id 18019)
stopped in MAIN at line 2 in file "shi.f"
2 i = -2
(dbx) whatis abs
Generic intrinsic function: "abs"
(dbx) print i
i = 0
(dbx) step
stopped in MAIN at line 3 in file "shi.f"
3 end
(dbx) print i
i = -2
(dbx) print abs(i)
abs(i) = 2
(dbx)