ira.c (clarify_prohibited_class_mode_regs): Prevent the function from accessing…

ira.c (clarify_prohibited_class_mode_regs): Prevent the function from accessing beyond the end of REGNO_REG_CLASS array by...

         * ira.c (clarify_prohibited_class_mode_regs): Prevent the function from
          accessing beyond the end of REGNO_REG_CLASS array by stopping the
          loop early.

From-SVN: r173699

gcc/ChangeLog

+2011-05-12  Hariharan Sandanagobalane <hariharan@picochip.com>
+
+	* ira.c (clarify_prohibited_class_mode_regs): Prevent the function from
+	accessing beyond the end of REGNO_REG_CLASS array by stopping the loop
+	early.
+
 2011-05-12  DJ Delorie  <dj@redhat.com>
 
 	(rx_builtins): New arrays - holds builtin functions.

gcc/ira.c

@@ -1422,6 +1422,12 @@ clarify_prohibited_class_mode_regs (void)
 	  if (TEST_HARD_REG_BIT (ira_prohibited_class_mode_regs[cl][j], hard_regno))
 	    continue;
 	  nregs = hard_regno_nregs[hard_regno][j];
+          if (hard_regno + nregs > FIRST_PSEUDO_REGISTER)
+            {
+              SET_HARD_REG_BIT (ira_prohibited_class_mode_regs[cl][j],
+                                hard_regno);
+               continue;
+            }
 	  pclass = ira_pressure_class_translate[REGNO_REG_CLASS (hard_regno)];
 	  for (nregs-- ;nregs >= 0; nregs--)
 	    if (((enum reg_class) pclass