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Subject: [Bug fortran/55501] [F03] ICE using MERGE in constant expr
Date: Wed, 28 Nov 2012 14:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55501

--- Comment #12 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-11-28 1=
4:54:33 UTC ---
(In reply to comment #10)
>   integer :: i(-1:1) =3D 0
>   print *, lbound(merge(i,i,.true.))

> Without the patch, this prints:
>            1
> And with the patch:
>           -1

Makes perfectly sense: For "lbound(array,dim)": "If ARRAY is a whole array =
and
either ARRAY is an assumed-size array of rank DIM or dimension DIM of ARRAY=
 has
nonzero extent, LBOUND (ARRAY, DIM) has a value equal to the lower bound for
subscript DIM of ARRAY. Otherwise the result value is 1."
With "whole array  array component or array name without further quali=0Cca=
tion
(6.5.2)"

Thus "lbound(i)" is a whole-array, "lbound(i(:))" or "lbound(merge(i,i,.tru=
e))"
is not.

I think the simplest it to replace "lbound (merge(i,i,.true.)" by "lbound( =
(i)
)" [e->expr_type =3D EXPR_OP && e->value.op.op =3D=3D INTRINSIC_PARENTHESES=
].
Possibly only if expr_type =3D=3D EXPR_VARIABLE as otherwise the
INTRINSIC_PARENTHESES will hamper further optimization (unless
-fno-protect-parens).