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Re: [Dotgnu-libjit] Problems with load and store on x86_64

From: Klaus Treichel
Subject: Re: [Dotgnu-libjit] Problems with load and store on x86_64
Date: Sat, 04 Oct 2008 13:06:56 +0200

Ji Jan,

Am Freitag, den 03.10.2008, 21:38 +0100 schrieb Jan Wedekind:
> Hi,
>      I am trying to use libjit for doing element-wise operations on arrays.
> The program below fills an array with values 0, 1, 2, ... and then
> adds 1 to it using libjit (i.e. the result should be 1, 2, 3, ...).
>      Under x86 it works so far. However on x86_64 it does not work for
> combinations of 8-bit or 16-bit numbers with floating point numbers
> (it returns large floating point numbers). I don't have any idea why
> it doesn't work. Can anybody help?
> Thanks in advance!
I thing i found the problem on x86_64.

The conversion to nfloat expects a jit_type_int in ste stackframe but
it's a sbyte. This causes the upper 3 bytes being random values.

The attached patch spills values with typesizes < 4 like ints to the
The x86_64 SysV abi doesn't mention if values passed to a function are
expanded to 4 or a bytes by the caller first (Only Bool is mentioned
So this might cause problems too.

Can you please try the attached patch if it fixes your problem?


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