[PATCH] Fix PR85955

[Richard Biener]

I am testing the following patch to fix an ICE with sincos
folding with mismatched arguments.

Bootstrap / regtest running on x86_64-unknown-linux-gnu.

Richard.

2018-06-04  Richard Biener  <rguent...@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.

Index: gcc/builtins.c
===================================================================
--- gcc/builtins.c      (revision 261145)
+++ gcc/builtins.c      (working copy)
@@ -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),
Index: gcc/testsuite/gcc.dg/pr85955.c
===================================================================
--- gcc/testsuite/gcc.dg/pr85955.c      (nonexistent)
+++ gcc/testsuite/gcc.dg/pr85955.c      (working copy)
@@ -0,0 +1,15 @@
+/* { 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;
+}