gcse.c (gcse_constant_p): Make sure the constant is sharable.

2009-04-30  Andreas Krebbel  <krebbel1@de.ibm.com>

	* gcse.c (gcse_constant_p): Make sure the constant is sharable.

From-SVN: r146997

gcc/ChangeLog

+2009-04-30  Andreas Krebbel  <krebbel1@de.ibm.com>
+
+	* gcse.c (gcse_constant_p): Make sure the constant is sharable.
+
 2009-04-29  James E. Wilson  <wilson@codesourcery.com>
 
 	* config/mips/mips.c (mips_add_offset): Use gen_int_mode for

gcc/gcse.c

@@ -1301,7 +1301,9 @@ gcse_constant_p (const_rtx x)
       && ! FLOAT_MODE_P (GET_MODE (XEXP (x, 1))))
     return true;
 
-  return CONSTANT_P (x);
+  /* Since X might be inserted more than once we have to take care that it
+     is sharable.  */
+  return CONSTANT_P (x) && (GET_CODE (X) != CONST || shared_const_p (x));
 }
 
 /* Scan pattern PAT of INSN and add an entry to the hash TABLE (set or