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Re: [Tinycc-devel] modern c++ compiler written in C (food for thought)
From: |
Basile Starynkevitch |
Subject: |
Re: [Tinycc-devel] modern c++ compiler written in C (food for thought) |
Date: |
Wed, 28 Oct 2015 07:11:47 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.3.0 |
On 10/28/2015 05:14 AM, Sergey Korshunoff wrote:
Hi Basile
A C++ compiler needs to be optimizing. The C++ language specification sort-of
requires an > > optimizing compiler
Did you say that a usual C compiler (gcc, clang) can not optimize as a C++ does?
A tcc compiler is a compiler for a development speedup. A final stage
can be build by the usual compiler.
No, I was just saying the obvious point that practically speaking the
C++11 standard is expecting any compiler implementing that standard to
optimize significantly. A C++ compiler should inline lots of functions
(including most member functions declared inside a class) and do a lot
of optimizations (in particular constant folding, some loop unrolling or
if (true) optimizations, dead code elimination, etc...). I giuess that
some template expansion cannot happen without optimizations.
Hence a trivial compiler like TinyC (which don't do any serious
optimization at all, this is why it compiles so fast) won't make sense
in C++; you cannot code a TinyC++ compiler (which would not have serious
optimization passes)!
I do know that both GCC & Clang are optimizing a common internal
representation (e.g. Gimple in GCC) which is the same (or at least
mostly overlapping) for C or C++ source code.
Notice that GCC even with -O0 is doing *some* optimizations.
Cheers.
--
Basile STARYNKEVITCH http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
8, rue de la Faiencerie, 92340 Bourg La Reine, France
*** opinions {are only mine, sont seulement les miennes} ***
- Re: [Tinycc-devel] modern c++ compiler written in C, (continued)
- Re: [Tinycc-devel] modern c++ compiler written in C, u-tcc-uepj, 2015/10/22
- Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/22
- Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/22
- Re: [Tinycc-devel] modern c++ compiler written in C, u-tcc-uepj, 2015/10/23
- Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/25
- Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/25
- Re: [Tinycc-devel] modern c++ compiler written in C, u-tcc-uepj, 2015/10/26
- Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/26
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Basile Starynkevitch, 2015/10/26
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Sergey Korshunoff, 2015/10/28
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought),
Basile Starynkevitch <=
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Christian Jullien, 2015/10/28
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Sergey Korshunoff, 2015/10/28
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Christian Jullien, 2015/10/29
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Basile Starynkevitch, 2015/10/29
- Re: [Tinycc-devel] modern c++ compiler written in C (food for thought), Sergey Korshunoff, 2015/10/29
Re: [Tinycc-devel] modern c++ compiler written in C, arnold, 2015/10/23
Re: [Tinycc-devel] modern c++ compiler written in C, Sergey Korshunoff, 2015/10/31