[PATCH][GIMPLE-FE] Expose 'sizetype' to the GIMPLE FE

[PATCH][GIMPLE-FE] Expose 'sizetype' to the GIMPLE FE

[Richard Biener]

This exposes 'sizetype' as __SIZETYPE__ to help writing "portable"
GIMPLE testcases.

Will commit soonish, more testcases might need adjustment
for some targets.

Richard.

2019-08-15  Richard Biener  <rguenther@suse.de>

	c-family/
	* c-common.c (c_stddef_cpp_builtins): When the GIMPLE FE is
	enabled, define __SIZETYPE__.

	* gcc.dg/pr80170.c: Adjust.

Index: gcc/c-family/c-common.c
===================================================================
--- gcc/c-family/c-common.c	(revision 274504)
+++ gcc/c-family/c-common.c	(working copy)
@@ -5148,6 +5148,10 @@ c_stddef_cpp_builtins(void)
     builtin_define_with_value ("__INTPTR_TYPE__", INTPTR_TYPE, 0);
   if (UINTPTR_TYPE)
     builtin_define_with_value ("__UINTPTR_TYPE__", UINTPTR_TYPE, 0);
+  /* GIMPLE FE testcases need access to the GCC internal 'sizetype'.
+     Expose it as __SIZETYPE__.  */
+  if (flag_gimple)
+    builtin_define_with_value ("__SIZETYPE__", SIZETYPE, 0);
 }
 
 static void
Index: gcc/testsuite/gcc.dg/pr80170.c
===================================================================
--- gcc/testsuite/gcc.dg/pr80170.c	(revision 274504)
+++ gcc/testsuite/gcc.dg/pr80170.c	(working copy)
@@ -24,11 +24,7 @@ NullB (void * misalignedPtr)
   struct B * b;
 
   bb_2:
-#if __SIZEOF_LONG__ == 8
-  b_2 = misalignedPtr_1(D) + 18446744073709551608ul;
-#else
-  b_2 = misalignedPtr_1(D) + 4294967292ul;
-#endif
+  b_2 = misalignedPtr_1(D) + _Literal (__SIZETYPE__) -__SIZEOF_POINTER__;
   __MEM <struct B> (b_2).a.a = _Literal (void *) 0;
   __MEM <struct B> (b_2).a.b = _Literal (void *) 0;
   return;