https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114012
Bug ID: 114012
Summary: overloaded unary operator called twice
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: alexandre.poux at coria dot fr
Target Milestone: ---
Created attachment 57470
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57470&action=edit
a program triggering the duplicate call on unary operator
In the attached code, I overloaded assignment (assign) and the unary operator
'-' (neg) for a custom class
The assign subroutine receive a polymorphic argument and the function neg
returns a polymorphic result.
When a simple `i = -i` is supposed to call `neg` and the `assign`, it
surprisingly call `neg` twice and then `assign`.
Both time `neg` is called with the correct argument (the old value of `i`) so
the result is good anyway.
As far as I know, `neg` and `assign` are supposed to be pure (which they are
not, due to the print) so this should only induce a performance hit.
I've observed this on an up to date Arch linux with core/gcc-fortran 13.2.1-5
and extra/gcc12-fortran 12.3.0-3.
