Re: [Qemu-devel] How does ARM VFP is emulated?

[Wei-Ren Chen]

On Fri, Aug 17, 2012 at 10:29:24AM +0200, Laurent Desnogues wrote:
> On Thursday, August 16, 2012, Oi Khote <address@hidden> wrote:
> > So how exactly does VFP is being emulated.
> 
> QEMU uses a library for FP computations, based on the softfloat package.

  I thought QEMU emulates VFP itself, something like

float VFP_helper(float a, float b) {

  ...

}

  But I am wrong, it acutally does this, right?

float64 VFP_HELPER(sqrt, d)(float64 a, CPUARMState *env)
{
    return float64_sqrt(a, &env->vfp.fp_status);
}

And float64_sqrt is implemented in fpu/* .

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj