[fpc-devel] Win64 FPC is in wrong download location

Jonas Maebe jonas.maebe at elis.ugent.be
Tue May 4 14:56:11 CEST 2010

On 04 May 2010, at 12:51, Michael Van Canneyt wrote:

> The i386 version of the compiler is simply much more optimized as the 64-bit
> version (as are all FPC-generated binaries).

That was true pre-2.4.0, but as of 2.4.0 the assembler optimiser is no longer enabled by default on i386 (and it didn't make that big of a difference in previous versions either). There are still some more peephole optimisations for i386, but I don't think the i386 code that FPC generates is that much more optimised than that for x86_64 at this point (or even PowerPC, for that matter).

And as far as the speed of the compiler binary is concerned depending on whether it consists of i386 or x86_64 machine code (using -a -s so that the speed of the external assembler is not included):

i386->i386 compiler compiling itself:
user	0m8.180s
sys	0m0.694s

x86-64->i386 compiler compiling itself:
user	0m8.096s
sys	0m0.736s

So at least on Mac OS X there is no real speed difference between the two.


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