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Re: libjava configure question
Andrew Haley wrote:
Tom Tromey writes:
> >>>>> "Andrew" == Andrew Haley <aph@redhat.com> writes:
>
> Andrew> One other thing: I don't think we can do this in general and meet even
> Andrew> the more relaxed requirements of java.lang.Math, because the x86 has a
> Andrew> restricted range of allowable arguments to its trig functions.
>
> I thought the Math restrictions were designed to explicitly allow use
> of the FPU on x86.
Yes, but not without some wrapper code. The crucial issue here is
full range reduction, and the floating-point instructions don't do
that by themselves.
I'm sure the math library functions do, though - we'd still likely get a
performance improvement from using those directly, even without inlining
of FP instructions - since they'll be optimized for each architecture.
Bryce