* gcc.c-torture/execute/loop-2e.c: Rewrite for 64 bit and no mmap.

From-SVN: r55724

gcc/testsuite/ChangeLog

+2002-07-24  Richard Henderson  <rth@redhat.com>
+
+	* gcc.c-torture/execute/loop-2e.c: Rewrite for 64 bit and no mmap.
+	
 2002-07-24  Gabriel Dos Reis  <gdr@nerim.net>
 
 	* g++.dg/ext/alignof1.C (main): Return 0 for success.

gcc/testsuite/gcc.c-torture/execute/loop-2e.c

-#include <limits.h>
-
-#ifdef __unix__ /* ??? Is that good enough? */
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#ifndef MAP_ANON
-#ifdef MAP_ANONYMOUS
-#define MAP_ANON MAP_ANONYMOUS
-#else
-#define MAP_ANON MAP_FILE
-#endif
-#endif
-#ifndef MAP_FILE
-#define MAP_FILE 0
-#endif
-#ifndef MAP_FIXED
-#define MAP_FIXED 0
-#endif
-#endif
-
-#define MAP_START (void *)0x7fff8000
-#define MAP_LEN 0x10000
-
-#define OFFSET (MAP_LEN/2 - 2 * sizeof (int));
-
-f (int *p, int **q)
+void f (int *p, int **q)
 {
   int i;
   for (i = 0; i < 40; i++)
@@ -34,27 +7,33 @@ f (int *p, int **q)
     }
 }
 
-main ()
+int main ()
 {
-#ifdef MAP_ANON
   void *p;
   int *q[40];
-  int dev_zero;
+  __SIZE_TYPE__ start;
 
-  dev_zero = open ("/dev/zero", O_RDONLY);
-  /* -1 is OK when we have MAP_ANON; else mmap will flag an error.  */
-  if (INT_MAX != 0x7fffffffL || sizeof (char *) != sizeof (int))
-    exit (0);
-  p = mmap (MAP_START, MAP_LEN, PROT_READ|PROT_WRITE,
-	    MAP_ANON|MAP_FIXED|MAP_PRIVATE, dev_zero, 0);
-  if (p != (void *)-1)
-    {
-      p = (char *)p + OFFSET;
-      q[39] = 0;
-      f (p, q);
-      if (q[39] != (int *)p + 39)
-	abort ();
-    }
-#endif
-  exit (0);
+  /* Find the signed middle of the address space.  */
+  if (sizeof(start) == sizeof(int))
+    start = (__SIZE_TYPE__) __INT_MAX__;
+  else if (sizeof(start) == sizeof(long))
+    start = (__SIZE_TYPE__) __LONG_MAX__;
+  else if (sizeof(start) == sizeof(long long))
+    start = (__SIZE_TYPE__) __LONG_LONG_MAX__;
+  else
+    return 0;
+
+  /* Arbitrarily align the pointer.  */
+  start &= -32;
+
+  /* Pretend that's good enough to start address arithmetic.  */
+  p = (void *)start;
+
+  /* Verify that GIV replacement computes the correct results.  */
+  q[39] = 0;
+  f (p, q);
+  if (q[39] != (int *)p + 39)
+    abort ();
+
+  return 0;
 }