Re: [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization

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On 6/19/07, Jeremy Fitzhardinge <[email protected]> wrote:
Denis Cheng wrote:
> From: Denis Cheng <[email protected]>
>
> the explicit memset call could be optimized out by data initialization,
> thus all the fill working can be done by the compiler implicitly.
>

How does the generated code change?  Does gcc do something stupid like
statically allocate a prototype structure full of zeros, and then memcpy
it in?  Or does it generate a series of explicit assignments for each
member?  Or does it generate a memset anyway?

Seems to me that this gives gcc the opportunity to be more stupid, and
the only right answer is what we're doing anyway.

    J

Technically speaking, C standard guarantees the data be initialized correctly;
just from the point view of code style, let the compiler selects how
to initialize will be better, this could let the compiler has more
optimization points.

--
Denis Cheng
Linux Application Developer
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