Disallow negative constant address for x32

gcc/

2012-02-10  Uros Bizjak  <ubizjak@gmail.com>

	PR target/52146
	* config/i386/i386.c (ix86_legitimate_address_p): Disallow
	negative constant address for x32.

gcc/testsuite/

2012-02-10  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/52146
	* gcc.target/i386/pr52146.c: New.

From-SVN: r184111

gcc/ChangeLog

+2012-02-10  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/52146
+	* config/i386/i386.c (ix86_legitimate_address_p): Disallow
+	negative constant address for x32.
+
 2012-02-10  Richard Henderson  <rth@redhat.com>
 
         * tree-ssa-dce.c (propagate_necessity): Handle GIMPLE_TRANSACTION.

gcc/config/i386/i386.c

@@ -11932,6 +11932,13 @@ ix86_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
   rtx base, index, disp;
   HOST_WIDE_INT scale;
 
+  /* Since constant address in x32 is signed extended to 64bit,
+     we have to prevent addresses from 0x80000000 to 0xffffffff.  */
+  if (TARGET_X32
+      && CONST_INT_P (addr)
+      && INTVAL (addr) < 0)
+    return false;
+
   if (ix86_decompose_address (addr, &parts) <= 0)
     /* Decomposition failed.  */
     return false;

gcc/testsuite/ChangeLog

+2012-02-10  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/52146
+	* gcc.target/i386/pr52146.c: New.
+
 2012-02-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/52177