For a reference, it's the /Gv compiler option:
https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=vs-2019
If anything it's proving to be an interesting study case on how to make
something optimal when given code that doesn't give the compiler many
clues. Granted, given the sample function, I'm envisioning some
node-level optimisation and auto-inlining.
Gareth aka. Kit
On 02/04/2020 16:48, J. Gareth Moreton wrote:
Apologies - I wasn't clear. There is an option in the MSVC compiler
to default to vectorcall, but you have to specify it.
Gareth aka. Kit
On 02/04/2020 16:16, Sven Barth via fpc-devel wrote:
Sven Barth <pascaldra...@googlemail.com
<mailto:pascaldra...@googlemail.com>> schrieb am Do., 2. Apr. 2020,
17:10:
P.S. Of course you can force it by forcing the vector to be
an m128 type
and specifying vectorcall for x86_64-win64, but not everyone
will know
to do that and it gets unwieldly rather quickly. Speaking of
vectorcall, I'm wondering if we can introduce 'fastcall' as
an alias for
'ms_abi_default', mostly so if we follow Microsoft Visual
C++'s example
of automatically making all routines vectorcall (which is
closer to the
System V ABI used by linux and will make vectorisation
easier), we can
force the default one if we need a routine that, say, has to
interface
with a third-party library ('fastcall' under win32 is what
the MS ABI is
based off... first parameter in ECX, second in EDX and
everything else
on the stack).
Please provide a source for your statement that MSVC uses
vectorcall by default. Cause I highly doubt that as Microsoft is
huge on backwards compatibility especially regarding the lower
level stuff.
Just checked myself: cdecl is the default. So nothing needs to be
changed here for us.
Regards,
Sven
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