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[PATCH] Avoid doing DCE in substitute_and_fold from VRP (PR tree-optimization/44508)

From: Jakub Jelinek <jakub at redhat dot com>
To: Richard Guenther <rguenther at suse dot de>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 14 Jun 2010 15:07:18 +0200
Subject: [PATCH] Avoid doing DCE in substitute_and_fold from VRP (PR tree-optimization/44508)
Reply-to: Jakub Jelinek <jakub at redhat dot com>

Hi!

libgomp.fortran/vla*.f90 fails on s390 on 4.4 branch, because
substitute_and_fold DCEs some trivially dead statements after earlier
substitutions/folding), which releases the LHS SSA_NAMEs.  Those
SSA_NAMEs are still referenced from some VRP ranges though and can result in
crashes, either still in substitute_and_fold in other folding using VRP,
or in subsequent identify_jump_threads call.
The problem is just latent on the trunk.

Bootstrapped/regtested on x86_64-linux and i686-linux on the trunk and on
x86_64-linux, i686-linux and s390-linux so far on 4.4 branch.

	Jakub

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Follow-Ups:
- Re: [PATCH] Avoid doing DCE in substitute_and_fold from VRP (PR tree-optimization/44508)
  - From: Richard Guenther

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