Re: More fp bug in egcs

[hjl@lucon.org (H.J. Lu)]

> 
> How does this patch look? It works for my test case.
> 
> I think it is a reload bug. I don't know what the purpose to output the
> last reload for a dead register. I don't what the best solution is and
> I am not sure if my patch covers all cases.
> 

Here is a revised patch. I hope this bug can be fixed in 1.0.3.

Thanks.


H.J.
----
Sun May  3 10:48:40 1998  H.J. Lu  (hjl@gnu.org)

	* reload1.c (emit_reload_insns): Don't output the last reload
	insn if OLD is not the dest of INSN and is dead at the end of
	INSN.

--- ../../../import/egcs/gcc/reload1.c	Mon Apr 20 08:23:47 1998
+++ ./reload1.c	Sun May  3 11:26:28 1998
@@ -6730,8 +6730,17 @@ emit_reload_insns (insn)
 
 	  /* Output the last reload insn.  */
 	  if (! special)
-	    gen_reload (old, reloadreg, reload_opnum[j],
-			reload_when_needed[j]);
+	    {
+	      rtx set;
+
+	      /* Don't output the last reload if OLD is not the dest
+		 of INSN and is dead at the end of INSN. */
+	      if (GET_CODE (old) != REG || !(set = single_set (insn))
+		  || old == SET_DEST (set)
+		  || !dead_or_set_p (insn, old))
+		gen_reload (old, reloadreg, reload_opnum[j],
+			    reload_when_needed[j]);
+	    }
 
 #ifdef PRESERVE_DEATH_INFO_REGNO_P
 	  /* If final will look at death notes for this reg,