flow.c (update_life_info): Amend comment about when a register can become dead.

	* flow.c (update_life_info): Amend comment about when a register
	can become dead.

From-SVN: r73838

gcc/ChangeLog

+2003-11-22  J"orn Rennecke <joern.rennecke@superh.com>
+
+	* flow.c (update_life_info): Amend comment about when a register
+	can become dead.
+
 2003-11-21  Kelley Cook  <kcook@gcc.gnu.org>
 
 	* doc/.cvsignore: Delete.

gcc/flow.c

@@ -594,6 +594,9 @@ verify_local_live_at_start (regset new_live_at_start, basic_block bb)
    generates subregs of a multi-word pseudo, current life analysis will
    lose the kill.  So we _can_ have a pseudo go live.  How irritating.
 
+   It is also not true when a peephole decides that it doesn't need one
+   or more of the inputs.
+
    Including PROP_REG_INFO does not properly refresh regs_ever_live
    unless the caller resets it to zero.  */