https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93826
--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The C code rejects this as follows.
The OpenACC specification talks about "tightly nested loops"; the OpenMP spec
is less clear but for "collapse" contrary to "tile" the implication that
tightly nested loops are meant is not far.
----------------------
int foo (int x, int y) {
int i, j;
#pragma omp parallel for collapse(2)
#pragma acc parallel loop collapse(2)
for (i = 0; i < 2; ++i)
{
for (j = 0; j < 2; ++j)
x = 5;
y = 7; /* { dg-error "collapsed loops not perfectly nested before 'y'" }
*/
}
return x + y;
}
int bar (int a, int b) {
int i, j;
#pragma acc parallel loop tile(2,2)
for (i = 0; i < 2; ++i)
{
for (j = 0; j < 2; ++j)
a = 5;
b = 7; /* { dg-error "collapsed loops not perfectly nested before 'b'" }
*/
}
return a + b;
}
