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Re: [PATCH] Fix -ftree-loop-linear (PR tree-optimization/29581)

From: "Daniel Berlin" <dberlin at dberlin dot org>
To: "Jakub Jelinek" <jakub at redhat dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 13 Nov 2006 23:44:47 -0500
Subject: Re: [PATCH] Fix -ftree-loop-linear (PR tree-optimization/29581)
References: <20061113195826.GJ6570@devserv.devel.redhat.com>

On 11/13/06, Jakub Jelinek <jakub@redhat.com> wrote:

Hi!

The attached 4 C testcases are miscompiled with -ftree-loop-linear
in 4.1/4.2/4.3 and the Fortran testcase is additionally miscompiled
on redhat/gcc-4_1-branch.  The problem is that
replace_uses_equiv_to_x_with_y replaces variables with the same step
as X with the new IV, but doesn't check if they also have the same
initial condition or the same type.
Regtested on x86_64-linux, including
RUNTESTFLAGS=--target_board=unix/-ftree-loop-linear.

The following patch fixes this, ok for 4.1/4.2/4.3?

Okay.

Thanks *very* much for fixing this!

References:
- [PATCH] Fix -ftree-loop-linear (PR tree-optimization/29581)
  - From: Jakub Jelinek

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