cse.c (canon_hash): Don't register registers in very small register classes...

	* cse.c (canon_hash): Don't register registers in very small
	register classes, as extending their lifetime might cause
	reload to fail.

From-SVN: r43714

gcc/ChangeLog

+2001-07-02  Geoffrey Keating  <geoffk@redhat.com>
+
+	* cse.c (canon_hash): Don't register registers in very small
+	register classes, as extending their lifetime might cause
+	reload to fail.
+
 Mon Jul  2 23:14:00 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 	* flow.c (try_redirect_by_replacing_jump): Remove cc0 setter.

gcc/cse.c

@@ -2266,10 +2266,13 @@ canon_hash (x, mode)
 	   failure to do so leads to failure to simplify 0<100 type of
 	   conditionals.
 
-	   On all machines, we can't record any global registers.  */
+	   On all machines, we can't record any global registers.  
+	   Nor should we record any register that is in a small
+	   class, as defined by CLASS_LIKELY_SPILLED_P.  */
 
 	if (regno < FIRST_PSEUDO_REGISTER
 	    && (global_regs[regno]
+		|| CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (regno))
 		|| (SMALL_REGISTER_CLASSES
 		    && ! fixed_regs[regno]
 		    && regno != FRAME_POINTER_REGNUM