On Mon, Oct 10, 2016 at 12:17:03AM -0700, Andrew Pinski wrote:
I tested on a x86_64 computer both 64-bit and 32-bit versions (the
latter compiled with -m32) as well as ARM under qemu.
In all those cases, I didn't get the proper result with floats while
doubles are ok, as well as chars.
That is because the variadic function ABI is different from the normal
argument ABI on ARM hard-float EABI. Basically for variadic functions
float are passed via the integer registers while for normal functions,
they are passed via the vfp registers.
Basically you need to use variadic function support in libff. Use
ffi_prep_cif_var instead of ffi_prep_cif and then don't do:
for(i=1 ; i<10 ; i++)
{
arg_types[i] = &ffi_type_float;
}
I'm actually using ffi_prep_cif_var() for the variadic call, but what
should I put as arg_type then ?