------- Comment #10 from dberlin at gcc dot gnu dot org 2007-07-13 16:47
-------
Subject: Re: [4.3 regression] ICE in set_ssa_val_to, at tree-ssa-sccvn.c:1022
On 13 Jul 2007 15:49:03 -0000, ebotcazou at gcc dot gnu dot org
<[EMAIL PROTECTED]> wrote:
>
>
> ------- Comment #9 from ebotcazou at gcc dot gnu dot org 2007-07-13 15:48
> -------
> And of course the naive patch:
>
> [EMAIL PROTECTED]:~/svn/gcc/gcc> Index: tree-ssa-sccvn.c
> ===================================================================
> --- tree-ssa-sccvn.c (revision 126547)
> +++ tree-ssa-sccvn.c (working copy)
> @@ -1279,7 +1279,7 @@ visit_phi (tree phi)
>
> /* If all value numbered to the same value, the phi node has that
> value. */
> - if (allsame)
> + if (allsame && sameval != VN_TOP)
> {
> if (is_gimple_min_invariant (sameval))
> {
>
Nah, that's not quite right, since this is a legal value.
Instead, where we init everything to VN_TOP, init everything with
SSA_NAME_OCCURS_IN_ABNORMAL_PHI to itself instead of VN_TOP.
IE VN_INFO (a)->valnum = a iff SSA_NAME_OCCURS_IN_ABNORMAL_PHI (a)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32705
