adding floating point support

adding floating point support

[Navid Toosizadeh]

Greetings,

Assume that we have gcc compiler for a target, and the gcc does not support floating point, but integers. Is there a simpler way rather than rebuilding the gcc to add support for floating point, for example by compiling fp-bit.c?
So basically, I'm asking for steps to add floating point support without going the difficult path of rebuildong and modifying gcc.

Best regards
Navid


      

Re: adding floating point support

[Navid Toosizadeh]

If I make a copy of fp-bit.c and add "#define float" to it and then compile the new file with the original one using the target's gcc compiler? 



----- Original Message ----
From: Navid Toosizadeh <navid_toosizadeh@yahoo.com>
To: gcc-help@gcc.gnu.org
Sent: Friday, January 23, 2009 2:44:55 PM
Subject: adding floating point support

Greetings,

Assume that we have gcc compiler for a target, and the gcc does not support floating point, but integers. Is there a simpler way rather than rebuilding the gcc to add support for floating point, for example by compiling fp-bit.c?
So basically, I'm asking for steps to add floating point support without going the difficult path of rebuildong and modifying gcc.

Best regards
Navid


      

Re: adding floating point support

[Ian Lance Taylor]

Navid Toosizadeh <navid_toosizadeh@yahoo.com> writes:

> Assume that we have gcc compiler for a target, and the gcc does not
> support floating point, but integers. Is there a simpler way rather
> than rebuilding the gcc to add support for floating point, for
> example by compiling fp-bit.c?  So basically, I'm asking for steps
> to add floating point support without going the difficult path of
> rebuildong and modifying gcc.

I'm not sure what you mean when you say that gcc doesn't support
floating point.  The normal gcc releases always support floating
point.  If the processor does not have any floating point
instructions, then gcc generates calls to runtime library routines.
Those runtime library routines are generally found in libgcc, and are
often compiled from config/fp-bit.c or from config/soft-fp/* or from
hand-written assembler code.  The first two choices should work even
for an unusual target.

Ian