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Re: sh-unknown-linux-gnu (Support of no fdiv for integer division)
Stephen Clarke wrote:
> One problem with -mno-fdiv-divsi is that it may be too specific
> for your purpose.
Well, it's OK for me to change the name of option and extend the
semantics. Yes, my point is we need some option for not using
FPU unexpectedly.
-mno-fpu-for-integer?
> If gcc were modified to use the fpu for another reason (say
> to take advantage of fast 64 bit load and store) then that could break
> the Linux kernel because -mno-fdiv-divsi would not disable it.
After all, I think that such a implementation is questionable. It
surprises programmer.
> It would be safer if the Linux kernel used an option which
> meant "generate code for the SH4 without touching floating-point
> state", even if this is a different option than the "-m4-nofpu" option.
I think that what we need is:
Generate code for SH4 without touching FPU,
if we only do interger arithmetic.
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