[Bug tree-optimization/33931] [4.3 Regression] ICE: tree check: expected ssa_name, have struct_field_tag in is_old_name, at tree-into-ssa.c:566

[rguenther at suse dot de]

------- Comment #4 from rguenther at suse dot de  2007-10-28 18:01 -------
Subject: Re:  [4.3 Regression] ICE: tree check:
 expected ssa_name, have struct_field_tag in is_old_name, at
tree-into-ssa.c:566

On Sun, 28 Oct 2007, pinskia at gcc dot gnu dot org wrote:

> ------- Comment #3 from pinskia at gcc dot gnu dot org  2007-10-28 17:38 -------
> Before PRE/may_alias:
>   # VUSE <PARM_NOALIAS.233_1775(D)>
>   D.1269_159 = *n_158(D);
> 
> After:
> # VUSE <SFT.151, SFT.154, MPT.253> { SFT.151 SFT.154 MPT.253 }
> D.1269_159 = *n_158(D);
> 
> HUH????  *n cannot alias anything really as it is argument to the function.
> 
> We have the same issue with pad_162 too (but at the first may_alias):
>   # VUSE <SFT.151_1776(D), SFT.154_1777(D), MPT.253_1778(D)>
>   D.1272_163 = *pad_162(D);
> 
> pad_162(D), name memory tag: NMT.245, is dereferenced, its value escapes,
> points-to vars: { PARM_NOALIAS.234 }
> 
> partitioning sucks for most Fortran code.

This is also exposed by the fix for PR33870.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33931