https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71844
Bug ID: 71844
Summary: Data mapping of an array section in the target
construct
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: ka6ash at gmail dot com
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Hi,
the following code from OpenMP examples 4.0.2(Section 58.3) causes an execution
error. I suppose the problem is that the _target_ construct tries to map A[30]
instead of using A[0:4].
The testsuit for libgomp contains a similar testcase but it has an additional
_map_ clause for A:
libgomp/testsuite/libgomp.c/examples-4/array_sections-4.c
#pragma omp target map(p[7:20]) map(A[0:4])
*** Example code
void foo ()
{
int A[30], *p;
#pragma omp target data map(A[0:4])
{
p = &A[0];
#pragma omp target map(p[7:20])
{
A[2] = 777;
p[8] = 777;
}
}
if (A[2] != 777 || A[8] != 777)
printf("FAIL\n");
}
*** Compilation flags
$ x86_64-pc-linux-gnu-gcc -O2 -fopenmp source.c
*** Error message
libgomp: Trying to map into device [0x7fff9538a420..0x7fff9538a498) object when
[0x7fff9538a420..0x7fff9538a430) is already mapped
*** GCC
$x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/install/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/install/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
OFFLOAD_TARGET_NAMES=x86_64-intelmicemul-linux-gnu
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib
--enable-languages=c,c++,fortran,lto --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--enable-offload-targets=x86_64-intelmicemul-linux-gnu --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160711 (experimental) (GCC)
