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[PATCH]: Fix PR tree-optimization/20470

From: Pat Haugen <pthaugen at us dot ibm dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Wed, 16 Mar 2005 13:03:49 -0600
Subject: [PATCH]: Fix PR tree-optimization/20470




The following patch fixes PR 20470.  We were missing fold opportunities for
"A op 0 ? A : -A" when A was of the form 'X-Y'.  A question I had on the
patch was whether the call to negate_expr_p(arg2) was required to verify
that it is safe to, in theory, negate arg2 back to the pattern trying to be
matched.

Bootstrap and regtested on powerpc64-unknown-linux-gnu.  OK for mainline?

-Pat


(See attached file: patch.pr20470)

Attachment: patch.pr20470
Description: Binary data

Follow-Ups:
- Re: [PATCH]: Fix PR tree-optimization/20470
  - From: Roger Sayle

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