re PR tree-optimization/92891 (ice in decompose, at wide-int.h:984)

	PR tree-optimization/92891
	* builtins.c (gimple_call_alloc_size): Convert size to sizetype
	before returning it.

	* gcc.c-torture/compile/pr92891.c: New test.

From-SVN: r279205

gcc/ChangeLog

+2019-12-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/92891
+	* builtins.c (gimple_call_alloc_size): Convert size to sizetype
+	before returning it.
+
 2019-12-10  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/92796

gcc/builtins.c

@@ -3755,7 +3755,7 @@ gimple_call_alloc_size (gimple *stmt)
     return NULL_TREE;
 
   if (argidx2 > nargs && TREE_CODE (size) == INTEGER_CST)
-    return size;
+    return fold_convert (sizetype, size);
 
   /* To handle ranges do the math in wide_int and return the product
      of the upper bounds as a constant.  Ignore anti-ranges.  */

gcc/testsuite/ChangeLog

+2019-12-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/92891
+	* gcc.c-torture/compile/pr92891.c: New test.
+
 2019-12-10  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/92796

gcc/testsuite/gcc.c-torture/compile/pr92891.c

+/* PR tree-optimization/92891 */
+
+int a, b;
+char *foo (int) __attribute__((alloc_size(1)));
+
+void
+bar (void)
+{
+  char *e = foo (2);
+  while (a)
+    {
+      if (b <= 0)
+	continue;
+      e[b] = 0;
+    }
+}