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re PR libgomp/80394 (Empty OpenMP task is wrongly removed when optimizing)

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PR libgomp/80394
	* omp-low.c (scan_omp_task): Don't optimize away empty tasks
	if they have any depend clauses.

	* testsuite/libgomp.c/pr80394.c: New test.

From-SVN: r246849
This commit is contained in:
Jakub Jelinek 2017-04-11 19:15:47 +02:00 committed by Jakub Jelinek
parent c6cf6ef7c0
commit fbc698e0f4
4 changed files with 37 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-04-11 Jakub Jelinek <jakub@redhat.com>
PR libgomp/80394
* omp-low.c (scan_omp_task): Don't optimize away empty tasks
if they have any depend clauses.
2017-04-11 Martin Liska <mliska@suse.cz> 2017-04-11 Martin Liska <mliska@suse.cz>
PR ipa/80212 PR ipa/80212

6
gcc/omp-low.c
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@ -1857,9 +1857,11 @@ scan_omp_task (gimple_stmt_iterator *gsi, omp_context *outer_ctx)
tree name, t; tree name, t;
gomp_task *stmt = as_a <gomp_task *> (gsi_stmt (*gsi)); gomp_task *stmt = as_a <gomp_task *> (gsi_stmt (*gsi));
/* Ignore task directives with empty bodies. */ /* Ignore task directives with empty bodies, unless they have depend
clause. */
if (optimize > 0 if (optimize > 0
&& empty_body_p (gimple_omp_body (stmt))) && empty_body_p (gimple_omp_body (stmt))
&& !omp_find_clause (gimple_omp_task_clauses (stmt), OMP_CLAUSE_DEPEND))
{ {
gsi_replace (gsi, gimple_build_nop (), false); gsi_replace (gsi, gimple_build_nop (), false);
return; return;

5
libgomp/ChangeLog
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@ -1,3 +1,8 @@
2017-04-11 Jakub Jelinek <jakub@redhat.com>
PR libgomp/80394
* testsuite/libgomp.c/pr80394.c: New test.
2017-04-04 Jakub Jelinek <jakub@redhat.com> 2017-04-04 Jakub Jelinek <jakub@redhat.com>
PR libgomp/79876 PR libgomp/79876

22
libgomp/testsuite/libgomp.c/pr80394.c Normal file
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@ -0,0 +1,22 @@
/* PR libgomp/80394 */
int
main ()
{
int x = 0;
#pragma omp parallel shared(x)
#pragma omp single
{
#pragma omp task depend(inout: x)
{
for (int i = 0; i < 100000; i++)
asm volatile ("" : : : "memory");
x += 5;
}
#pragma omp task if (0) depend(inout: x)
;
if (x != 5)
__builtin_abort ();
}
return 0;
}