openmp: Avoid ICEs with declare simd; declare simd inbranch [PR93555]

The testcases ICE because when processing the declare simd inbranch,
we don't create the i == 0 clone as it already exists, which means
clone_info->nargs is not adjusted, but we then rely on it being adjusted
when trying other clones.

2020-02-05  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/93555
	* omp-simd-clone.c (expand_simd_clones): If simd_clone_mangle or
	simd_clone_create failed when i == 0, adjust clone->nargs by
	clone->inbranch.

	* c-c++-common/gomp/pr93555-1.c: New test.
	* c-c++-common/gomp/pr93555-2.c: New test.
	* gfortran.dg/gomp/pr93555.f90: New test.

2 files changed, 34 insertions, 0 deletions

diff --git a/gcc/testsuite/c-c++-common/gomp/pr93555-1.c b/gcc/testsuite/c-c++-common/gomp/pr93555-1.c
new file mode 100644
index 00000000000..2eb76a2d9de
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/pr93555-1.c
@@ -0,0 +1,18 @@
+/* PR middle-end/93555 */
+/* { dg-do compile } */
+
+#pragma omp declare simd
+#pragma omp declare simd inbranch
+int
+foo (int x)
+{
+  return x;
+}
+
+#pragma omp declare simd inbranch
+#pragma omp declare simd
+int
+bar (int x)
+{
+  return x;
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/pr93555-2.c b/gcc/testsuite/c-c++-common/gomp/pr93555-2.c
new file mode 100644
index 00000000000..091f5bd5ff1
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/pr93555-2.c
@@ -0,0 +1,16 @@
+/* PR middle-end/93555 */
+/* { dg-do compile } */
+
+#pragma omp declare simd
+#pragma omp declare simd inbranch
+void
+foo (void)
+{
+}
+
+#pragma omp declare simd inbranch
+#pragma omp declare simd
+void
+bar (void)
+{
+}