NetBSD 6.1.5 doesn't have ldexpl in math.h

[Gary E. Miller]

Yo Mark!

On Wed, 13 Sep 2017 23:15:10 +0000
Mark Atwood <fallenpegasus at gmail.com> wrote:

> We could just grab from NetBSD7.

Nope, that is very low level FPU assembly code.  Very arch dependent.
Usually buried deep in the C compiler as a builtin.

Just look at gcc for all the arch options it has for floating point!

> Or if we know it's an IEEE754
> float, just do the direct bit ops.

Sort of a float, it is a long double.  The IEEE754 does not specify how
big in memory a long double is.  It may be 80 bits, or 128 bits, or?

IEEE754 also does not specify how the bits are arranged in memory.

> Or the direct fp cpu op.

Assuming you even have a long double FPU.  Remember this has to
support various, ARM, i386, amd64, MIPS, sparc, etc.  you may not even
have any FPU.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
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