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Re: Tree-ssa dead store elimination

From: Andrew Pinski <pinskia at physics dot uc dot edu>
To: Pat Haugen <pthaugen at us dot ibm dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 13 Apr 2005 17:17:26 -0400
Subject: Re: Tree-ssa dead store elimination
References: <OFC67A630A.C0909844-ON86256FE2.00730297-86256FE2.00748B99@us.ibm.com>

On Apr 13, 2005, at 5:12 PM, Pat Haugen wrote:

Sorry if there is an obvious answer for this, but I'm not to familiar with the tree-ssa phase.
My question is, why doesn't tree-ssa-dse.c do anything to the following
code?

Because it does not understand V_MUST_DEF, see PR 18880 for a patch and more information on the problem.

-- Pinski

References:
- Tree-ssa dead store elimination
  - From: Pat Haugen

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