re PR middle-end/85955 (ICE in fold_convert_loc, at fold-const.c:2408)

2018-06-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85955
	* builtins.c (fold_builtin_sincos): Convert pointers to
	destination to appropriate type before dereferencing.

	* gcc.dg/pr85955.c: New testcase.

From-SVN: r261165

gcc/ChangeLog

+2018-06-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85955
+	* builtins.c (fold_builtin_sincos): Convert pointers to
+	destination to appropriate type before dereferencing.
+
 2018-06-04  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.md (abs<mode>2 for FLOAT128): Handle IFmode.

gcc/builtins.c

@@ -8266,6 +8266,9 @@ fold_builtin_sincos (location_t loc,
       call = builtin_save_expr (call);
     }
 
+  tree ptype = build_pointer_type (type);
+  arg1 = fold_convert (ptype, arg1);
+  arg2 = fold_convert (ptype, arg2);
   return build2 (COMPOUND_EXPR, void_type_node,
 		 build2 (MODIFY_EXPR, void_type_node,
 			 build_fold_indirect_ref_loc (loc, arg1),

gcc/testsuite/ChangeLog

+2018-06-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85955
+	* gcc.dg/pr85955.c: New testcase.
+
 2018-06-04  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/85981

gcc/testsuite/gcc.dg/pr85955.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -w" } */
+
+extern void sincos(double x, double *sinx, double *cosx);
+void apply(void (*f)(double, double *, double *),
+	   double x, double *sinx, double *cosx)
+{
+  f(x, sinx, cosx);
+  return;
+}
+void apply_sincos(double x, double **sinx, double **cosx)
+{
+  apply(sincos, x, sinx, cosx);
+  return;
+}