backport: re PR target/82112 (internal compiler error: in fold_convert_loc, at fold-const.c:2262)

	Backported from mainline
	2017-09-12  Jakub Jelinek  <jakub@redhat.com>

	PR target/82112
	* c-common.c (sync_resolve_size): Instead of c_dialect_cxx ()
	assertion check that in the condition.
	(get_atomic_generic_size): Likewise.  Before testing if parameter
	has pointer type, if it has array type, call for C++
	default_conversion to perform array-to-pointer conversion.

	* c-c++-common/pr82112.c: New test.
	* gcc.dg/pr82112.c: New test.

From-SVN: r252886

5 files changed, 57 insertions, 4 deletions

diff --git a/gcc/c-family/ChangeLog b/gcc/c-family/ChangeLog
index bbe467d..1d3f3bb 100644
--- a/gcc/c-family/ChangeLog
+++ b/gcc/c-family/ChangeLog
@@ -1,6 +1,15 @@
 2017-09-16  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2017-09-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/82112
+	* c-common.c (sync_resolve_size): Instead of c_dialect_cxx ()
+	assertion check that in the condition.
+	(get_atomic_generic_size): Likewise.  Before testing if parameter
+	has pointer type, if it has array type, call for C++
+	default_conversion to perform array-to-pointer conversion.
+
 	2017-07-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/45784
diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 3524570..4a1c2e4 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -10534,10 +10534,9 @@ sync_resolve_size (tree function, vec<tree, va_gc> *params)
     }
 
   type = TREE_TYPE ((*params)[0]);
-  if (TREE_CODE (type) == ARRAY_TYPE)
+  if (TREE_CODE (type) == ARRAY_TYPE && c_dialect_cxx ())
     {
       /* Force array-to-pointer decay for C++.  */
-      gcc_assert (c_dialect_cxx());
       (*params)[0] = default_conversion ((*params)[0]);
       type = TREE_TYPE ((*params)[0]);
     }
@@ -10692,10 +10691,9 @@ get_atomic_generic_size (location_t loc, tree function,
 
   /* Get type of first parameter, and determine its size.  */
   type_0 = TREE_TYPE ((*params)[0]);
-  if (TREE_CODE (type_0) == ARRAY_TYPE)
+  if (TREE_CODE (type_0) == ARRAY_TYPE && c_dialect_cxx ())
     {
       /* Force array-to-pointer decay for C++.  */
-      gcc_assert (c_dialect_cxx());
       (*params)[0] = default_conversion ((*params)[0]);
       type_0 = TREE_TYPE ((*params)[0]);
     }
@@ -10734,6 +10732,12 @@ get_atomic_generic_size (location_t loc, tree function,
       /* __atomic_compare_exchange has a bool in the 4th position, skip it.  */
       if (n_param == 6 && x == 3)
         continue;
+      if (TREE_CODE (type) == ARRAY_TYPE && c_dialect_cxx ())
+	{
+	  /* Force array-to-pointer decay for C++.  */
+	  (*params)[x] = default_conversion ((*params)[x]);
+	  type = TREE_TYPE ((*params)[x]);
+	}
       if (!POINTER_TYPE_P (type))
 	{
 	  error_at (loc, "argument %d of %qE must be a pointer type", x + 1,
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 853812a..be66391 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,12 @@
 2017-09-16  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2017-09-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/82112
+	* c-c++-common/pr82112.c: New test.
+	* gcc.dg/pr82112.c: New test.
+
 	2017-08-08  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/81766
diff --git a/gcc/testsuite/c-c++-common/pr82112.c b/gcc/testsuite/c-c++-common/pr82112.c
new file mode 100644
index 0000000..724d74c
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr82112.c
@@ -0,0 +1,13 @@
+/* PR target/82112 */
+/* { dg-do compile } */
+
+int c[10], d[10], e[10], f[10], g[10], h[10], i[10], j[10], k[10], l[10];
+
+void
+foo (void)
+{
+  __atomic_load (c, d, __ATOMIC_ACQUIRE);
+  __atomic_store (e, f, __ATOMIC_SEQ_CST);
+  __atomic_exchange (g, h, i, __ATOMIC_RELAXED);
+  __atomic_compare_exchange (j, k, l, 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
+}
diff --git a/gcc/testsuite/gcc.dg/pr82112.c b/gcc/testsuite/gcc.dg/pr82112.c
new file mode 100644
index 0000000..4ca6919
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr82112.c
@@ -0,0 +1,21 @@
+/* PR target/82112 */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu90" } */
+
+struct S { int a[10]; } bar (void);
+int b, c;
+
+void
+foo (void)
+{
+  __atomic_load (bar ().a, &b, __ATOMIC_ACQUIRE);	/* { dg-error "argument 1 of .__atomic_load. must be a non-void pointer type" } */
+  __atomic_load (&b, bar ().a, __ATOMIC_ACQUIRE);	/* { dg-error "argument 2 of .__atomic_load. must be a pointer type" } */
+  __atomic_store (bar ().a, &b, __ATOMIC_SEQ_CST);	/* { dg-error "argument 1 of .__atomic_store. must be a non-void pointer type" } */
+  __atomic_store (&b, bar ().a, __ATOMIC_SEQ_CST);	/* { dg-error "argument 2 of .__atomic_store. must be a pointer type" } */
+  __atomic_exchange (bar ().a, &b, &c, __ATOMIC_RELAXED);	/* { dg-error "argument 1 of .__atomic_exchange. must be a non-void pointer type" } */
+  __atomic_exchange (&b, bar ().a, &c, __ATOMIC_RELAXED);	/* { dg-error "argument 2 of .__atomic_exchange. must be a pointer type" } */
+  __atomic_exchange (&b, &c, bar ().a, __ATOMIC_RELAXED);	/* { dg-error "argument 3 of .__atomic_exchange. must be a pointer type" } */
+  __atomic_compare_exchange (bar ().a, &b, &c, 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED);	/* { dg-error "argument 1 of .__atomic_compare_exchange. must be a non-void pointer type" } */
+  __atomic_compare_exchange (&b, bar ().a, &c, 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED);	/* { dg-error "argument 2 of .__atomic_compare_exchange. must be a pointer type" } */
+  __atomic_compare_exchange (&b, &c, bar ().a, 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED);	/* { dg-error "argument 3 of .__atomic_compare_exchange. must be a pointer type" } */
+}