re PR target/88195 (misleading error message for unsupported builtin)

	PR target/88195
	* config/i386/i386.c (def_builtin2): If tcode == VOID_FTYPE_UINT64
	and !TARGET_64BIT, return NULL_TREE.

	* gcc.target/i386/pr88195.c: New test.

From-SVN: r266487

gcc/ChangeLog

 2018-11-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/88195
+	* config/i386/i386.c (def_builtin2): If tcode == VOID_FTYPE_UINT64
+	and !TARGET_64BIT, return NULL_TREE.
+
 	PR c++/86900
 	* dwarf2out.c (secname_for_decl): For functions with
 	DECL_SECTION_NAME if in_cold_section_p, try to return

gcc/config/i386/i386.c

@@ -30220,9 +30220,13 @@ def_builtin2 (HOST_WIDE_INT mask, const char *name,
 {
   tree decl = NULL_TREE;
 
-  ix86_builtins_isa[(int) code].isa2 = mask;
   if (tcode == VOID_FTYPE_UINT64)
-    ix86_builtins_isa[(int) code].isa = OPTION_MASK_ISA_64BIT;
+    {
+      if (!TARGET_64BIT)
+	return decl;
+      ix86_builtins_isa[(int) code].isa = OPTION_MASK_ISA_64BIT;
+    }
+  ix86_builtins_isa[(int) code].isa2 = mask;
 
   if (mask == 0
       || (mask & ix86_isa_flags2) != 0

gcc/testsuite/ChangeLog

 2018-11-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/88195
+	* gcc.target/i386/pr88195.c: New test.
+
 	PR testsuite/88090
 	* obj-c++.dg/attributes/method-nonnull-1.mm (my_size_t): New typedef.
 	(MyArray::removeObjectAtIndex): Use my_size_t instead of size_t and

gcc/testsuite/gcc.target/i386/pr88195.c

+/* PR target/88195 */
+/* { dg-options "-mptwrite" } */
+
+void
+foo (void)
+{
+  __builtin_ia32_ptwrite64 (1);	/* { dg-warning "implicit declaration of function" "" { target ia32 } } */
+}