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[Committed] Optimize VIEW_CONVERT_EXPR<TREE_TYPE(T),T>

From: "Roger Sayle" <roger at eyesopen dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Thu, 18 Jan 2007 17:31:21 -0700 (MST)
Subject: [Committed] Optimize VIEW_CONVERT_EXPR<TREE_TYPE(T),T>

The following "obvious" patch teaches fold that it can eliminate a
VIEW_CONVERT_EXPR which "casts/reinterprets" its operand in the same type
that it actually has!

The following patch has been tested on i686-pc-linux-gnu with a full "make
bootstrap", all default languages including Ada, and regression tested
with a top-level "make -k check" with no new failures.

Committed to mainline as revision 120945.


2007-01-18  Roger Sayle  <roger@eyesopen.com>

        * fold-const.c (fold_unary) <VIEW_CONVERT_EXPR>: Optimize away a
        VIEW_CONVERT_EXPR to the same type as it's operand.

Roger
--

Attachment: patchv.txt
Description: Text document

Follow-Ups:
- Re: [Committed] Optimize VIEW_CONVERT_EXPR<TREE_TYPE(T),T>
  - From: Andrew Pinski

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