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Re: Converting to ISO C89
- From: Raja R Harinath <harinath at cs dot umn dot edu>
- To: <tm_gccmail at mail dot kloo dot net>
- Cc: Zack Weinberg <zack at codesourcery dot com>,"Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>, mark at codesourcery dot com,gcc at gcc dot gnu dot org, gdr at integrable-solutions dot net
- Date: Tue, 25 Mar 2003 16:23:35 -0600
- Subject: Re: Converting to ISO C89
- References: <Pine.LNX.4.21.0303251501170.27137-100000@mail.kloo.net>
<tm_gccmail at mail dot kloo dot net> writes:
> On Tue, 25 Mar 2003, Raja R Harinath wrote:
[snip stage2 bootstrap with C++ compiler]
>> I was thinking more about optimization: ensure that there's no
>> abstraction penalty for using a C++ compiler on C code, and that both
>> the C and C++ compilers exploit the same optimization opportunities.
>>
>> - Hari
>
> IIRC, C code compiled as C++ needs to carry around stack unwinding
> information whereas C code compiled as C does not.
>
> Therefore, the abstraction penalty cannot be zero in terms of code size.
Since we know it is C code, we can compile with -fno-exceptions. The
size of the CFG should not be significantly larger since there should
be no additional flows of control (hidden or otherwise).
- Hari
--
Raja R Harinath ------------------------------ harinath at cs dot umn dot edu