Re: [RFA:] grep rtl-expand for "(call" for hard_float

[Bob Wilson <bwilson at tensilica dot com>]

Hans-Peter Nilsson wrote:
> Finally.  I'm not replacing it, just augmenting with a better
> default-value than hard_float=1 for all but mips* and xtensa-*.
> One reason to keep the old method as an override was that from
> reading the port, it seems xtensa doesn't have "hardware"
> doubles (only floats), so there may be actual need for an
> override.  Or may not; I'm not sure it should validly be called
> hard_float.  Or in retrospect maybe we should just really check
> the type float here and have a separate hard_double.

Your observation about Xtensa is correct: there is currently a single-precision 
hardware FP option, but no double-precision hardware support.  I usually run the 
testsuite with an Xtensa processor configuration that doesn't include any 
hardware floating-point so the current code works OK for that.  It seems like it 
is probably still not right when the hardware FP is enabled.

I think your new-and-improved code would handle the Xtensa situation nicely. 
Feel free to remove the Xtensa-specific override, or if you prefer, I can do 
that later, assuming your patch is approved.

Thanks for working on this.

--Bob