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[patch] libitm: Don't execute memtransfer/memset if size isn't larger than zero.

From: Torvald Riegel <triegel at redhat dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 05 Mar 2012 14:34:29 +0100
Subject: [patch] libitm: Don't execute memtransfer/memset if size isn't larger than zero.

This patch skips execution of memtransfer/memset if there actually isn't
anything to do.  Calls to memcpy/memmove/memset with size==0 should be
rare I'd suppose but prior code would still treat this no-op like some
store (ml_wt was particularly bad: it would to acquire _all_ locks in
such a case due to calculating a correct exclusive upper bound anymore).

OK for trunk?
4.7 too?

Attachment: patch1
Description: Text document

Follow-Ups:
- Re: [patch] libitm: Don't execute memtransfer/memset if size isn't larger than zero.
  - From: Richard Guenther

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