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Re: [Qemu-devel] WE NEED GCC 4 please

From: Andreas Färber
Subject: Re: [Qemu-devel] WE NEED GCC 4 please
Date: Mon, 21 Jan 2008 13:45:50 +0100

Am 21.01.2008 um 12:18 schrieb Johannes Schindelin:

The miniops right now are implemented as plain C commands. If the "good"
gcc guys would not have insisted on not having an option to force the
"ret" or "jmp" statement at the end of the function, we could use them for
_all_ processors.

As it is, Fabrice's code generator will most likely be something similar
to Paul's qops, which means that you have to invent a "primitive C" in
which to write the miniops, and you will have to write a backend for
_each_ and _every_ host CPU you support.

Has anyone looked into the idea of manually generating machine instructions through preprocessor macros at runtime, then jumping there? That's what the Mono JIT does, leaving C compilers completely out of the picture.

But apart from it being lots of work to start from scratch and for each and every host CPU, if translating at instruction level rather than method level it would require lots of jumps between instruction decoding and generated instructions though.


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