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RFA: fix comment in flow.c


2003-11-21  J"orn Rennecke <joern.rennecke@superh.com>

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

Index: flow.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/flow.c,v
retrieving revision 1.563
diff -p -r1.563 flow.c
*** flow.c	17 Oct 2003 10:30:43 -0000	1.563
--- flow.c	21 Nov 2003 14:13:48 -0000
*************** verify_local_live_at_start (regset new_l
*** 596,601 ****
--- 596,604 ----
     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.  */
  


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