[Bug tree-optimization/19360] [4.0 Regression] ICE with -O1 -funit-at-a-time

[law at redhat dot com]

------- Additional Comments From law at redhat dot com  2005-01-17 20:45 -------
Subject: Re:  [4.0 Regression] ICE with -O1
	-funit-at-a-time

On Tue, 2005-01-11 at 11:14 +0000, jakub at gcc dot gnu dot org wrote:
> ------- Additional Comments From jakub at gcc dot gnu dot org  2005-01-11 11:14 -------
> tree-ssa-dom.c in this case uses a released SSA_NAME.
> The dom pass recorded a SSA_NAME X into another SSA_NAME (Y)'s SSA_NAME_VALUE,
> then tree_duplicate_bb called indirectly from thread_through_all_blocks
> marks X for rewrite and following rewrite_ssa_into_ssa releases X, but X's
> address is still in Y's SSA_NAME_VALUE.  Later on when Y's SSA_NAME_VALUE is
> used, it references a released SSA_NAME and the compiler crashes.
Yea.  I stumbled upon this before I went on vacation last week.  I've 
got a patch here that I'll get bootstrapped and regression tested.

jeff




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19360