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.

gcc/ChangeLog

@@ -1,3 +1,10 @@
+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.
+
 2020-02-05  Martin Liska  <mliska@suse.cz>
 
 	PR c++/92717

gcc/omp-simd-clone.c

@@ -1713,14 +1713,22 @@ expand_simd_clones (struct cgraph_node *node)
 	     already.  */
 	  tree id = simd_clone_mangle (node, clone);
 	  if (id == NULL_TREE)
-	    continue;
+	    {
+	      if (i == 0)
+		clone->nargs += clone->inbranch;
+	      continue;
+	    }
 
 	  /* Only when we are sure we want to create the clone actually
 	     clone the function (or definitions) or create another
 	     extern FUNCTION_DECL (for prototypes without definitions).  */
 	  struct cgraph_node *n = simd_clone_create (node);
 	  if (n == NULL)
-	    continue;
+	    {
+	      if (i == 0)
+		clone->nargs += clone->inbranch;
+	      continue;
+	    }
 
 	  n->simdclone = clone;
 	  clone->origin = node;

gcc/testsuite/ChangeLog

@@ -1,4 +1,11 @@
-2020-02-05  Jun Ma <JunMa@linux.alibaba.com>
+2020-02-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/93555
+	* 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.
+
+2020-02-05  Jun Ma  <JunMa@linux.alibaba.com>
 
 	* g++.dg/coroutines/co-await-14-return-ref-to-auto.C: New test.
 

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;
+}

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)
+{
+}

gcc/testsuite/gfortran.dg/gomp/pr93555.f90

@@ -0,0 +1,11 @@
+! PR middle-end/93555
+! { dg-do compile }
+
+subroutine foo
+  !$omp declare simd(foo)
+  !$omp declare simd(foo) inbranch
+end
+subroutine bar
+  !$omp declare simd(bar) inbranch
+  !$omp declare simd(bar)
+end