https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101841
Bug ID: 101841
Summary: Wrong realloc-lhs warning with matmul and -O2
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: jellby at yahoo dot com
Target Milestone: ---
I get a warning with this:
program test
real, allocatable :: F(:,:), A(:,:), B(:,:)
allocate(F(10,10), A(10,10), B(10,10))
F(:,:) = 1.0
A(:,:) = 0.5
B(:,:) = 2.0
F(:,:) = F-matmul(a,b)
end program test
$ gfortran test.f90 -Wrealloc-lhs -O2
No warning with "F(:,:) = matmul(a,b)"
Maybe the warning means that a temporary array is created (although I guess it
wouldn't be needed)? But as far as I can see there should be no reallocation
here.
