Am 25.12.2012 19:30, schrieb Dimitri Smits:
I'm guessing that is NOT on a Windows platform? Every full build (it
has been a while) I've ever done of the compiler on windows was at
least a few minutes.
It is windows: "self compilation". No rtl building or whatever.
The only approach I see to speed it up is to kick the whole back
end and generate directly some close to i386 intermediate code
directly in the parser.
lovely, but isn't that what Embarcadero is doing for their future
compiler?
No. It is exactly the counterpart. llvm intermediate language is for
sure as much as possible platform independent and not "close to i386" as
I wrote. If one wants to accelarate FPC by one magnitude one cannot
fiddle with some abstract intermediate layer but output already from the
parser something as close as possible to i386 machine code, do register
allocations and optimizations on it and write the machine code to disk.
Using the llvm toolchain, they will provide a front
compiler to an intermediate "language" or interpreted code. Then they
have a few optimisations for the middle layer and use the back-ends
that are already available to make stuff architecturally compile to
whatever back-end (ARM v?, intel x86, powerpc, motorola 68k, jvm,
dalvik, .net il, compiled php, ... or any community or custom
backend)
... and this costs time. And it is similiar to FPC's approach.
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