[Bug tree-optimization/15353] [tree-ssa] Merge two "if"s if one subsumes the other.

[law at redhat dot com]

------- Additional Comments From law at redhat dot com  2005-08-11 15:43 -------
Subject: Re:  [tree-ssa] Merge two "if"s if
	one subsumes the other.

On Thu, 2005-08-11 at 11:01 +0000, rguenth at gcc dot gnu dot org wrote:
> ------- Additional Comments From rguenth at gcc dot gnu dot org  2005-08-11 11:01 -------
> Couldn't DOM do this at jump threading time? I.e.
> 
>   if (D.1286_3 > D.1287_5) goto <L3>; else goto <L1>;
> 
> <L1>:;
>   if (D.1286_3 == D.1287_5) goto <L3>; else goto <L2>;
> 
> during trying of threading through the jump at L1 merge the
> two conditionals?
Jump threading isn't particularly well suited for this kind of
optimization.  

jeff




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15353