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Date: Thu, 5 Sep 2013 07:58:38 -0400
From: Yaniv Sapir <>
To: john-dev <>
Subject: Re: Parallella: Litecoin mining

Alexander is right, and you can see examples of how the compiler switches
modes using objdump. Usually if you compile w/o -mfp-mode option - when
mixing integer and real statements, you should find places where the
compiler emitted "CONFIG" programming sequences involving setting GIE and

On Wed, Sep 4, 2013 at 12:53 AM, Solar Designer <> wrote:

> Hi Rafael,
> On Wed, Sep 04, 2013 at 04:54:55AM +0100, Rafael Waldo Delgado Doblas
> wrote:
> > BTW I was debugging with e-gdb and I found that even If I use the imadd
> > instruction the bynary image uses fmadd,
> This is normal.  They are one and the same instruction, so the
> disassembler has no way to know which is meant - and it shows fmadd.
> > There any way to use integer math?
> You should, of course, switch the FPU to integer mode.  This is done by
> flipping a bit in the CONFIG register.  I think e-gcc emits the
> necessary instructions in init() if you build with "-mfp-mode=int",
> which you should.
> Alexander

Yaniv Sapir
Adapteva Inc.
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