From: John Love-Jensen <eljay@adobe.com>
To: "龙海涛 " <longhaitao@otsc.com.cn>, "MSX to GCC" <gcc-help@gcc.gnu.org>
Subject: Re: a question about code optimization
Date: Sat, 05 Jan 2008 14:25:00 -0000 [thread overview]
Message-ID: <C3A2317F.29C3B%eljay@adobe.com> (raw)
In-Reply-To: <477C37E0.1060006@otsc.com.cn>
Hi,
> So my questions is:
> is gcc *smart* enough that she can determine when to do the optimization?
Yes.
GCC can do the optimization when the optimizer has sufficient information to
be certain that there are no side effects.
GCC can not do the optimization when there is a black-box routine involved.
Although there may be some aspects outside of the black-box routine that may
be optimized.
There is another compiler, LLVM, that does holistic optimizations. If I
recall correct, there is an effort to add (or perhaps merely to investigate
adding) holistic optimizations into GCC.
--Eljay
next prev parent reply other threads:[~2008-01-03 12:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <C3A0E1D1.29B03%eljay@adobe.com>
2008-01-04 14:38 ` 龙海涛
2008-01-05 14:25 ` John Love-Jensen [this message]
2008-01-09 17:06 ` 龙海涛
2008-01-09 23:03 ` 龙海涛
2008-01-10 19:51 ` John Love-Jensen
2007-12-22 5:41 龙海涛
2007-12-22 10:20 ` Christoph Bartoschek
2007-12-25 3:00 ` 龙海涛
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