[PATCH 2/3 V2] Do not include stdio.h in libgcc's Decimal/Float128 conversions.

[Joseph Myers]

On Wed, 3 Mar 2021, Michael Meissner via Gcc-patches wrote:

> As we have discussed many times, on 32-bit BE, you cannot use hardware
> _Float128 support on power9/power10 because there is no TImode in 32-bit.
> Various machine independent parts of GCC require an integer type to be the same
> size as basic types.  If somebody made TImode work, we can remove the
> restriction and allow _Float128 to work on 32-bit.

I'm not sure exactly what the machine-independent requirement is, but 
_Float128 is supported for 32-bit x86, riscv, sparc and s390 at least.

There's no support for _Float128 in the 32-bit powerpc ABI, but I don't 
think there is anything architecture-independent preventing such support 
on 32-bit platforms where TImode is unsupported (i.e. not supported by the 
scalar_mode_supported_p hook).

-- 
Joseph S. Myers
joseph@codesourcery.com