fix typos in comments, mainly s/extention/extension/ and s/sufficent/sufficient/

use named initializers

provide a common softfloat fenv implemenation and use it for softfloat builds.
restore ABI compatibility with previous releases for ieeefp.h on sh3.
add namespace.h protection for all the fenv interf

provide a common softfloat fenv implemenation and use it for softfloat builds.
restore ABI compatibility with previous releases for ieeefp.h on sh3.
add namespace.h protection for all the fenv interfaces.
use MKSOFTFLOAT on sh3 instead of assuming softfloat.
standardize on comparing MKSOFTFLOAT with "no".
remove the arm-specific softfloat fenv code (which also had several bugs).
fix logic errors in the arm hardfloat feraiseexcept() and feupdateenv().

show more ...

PR/50822: David Binderman: Fix copy length.

Preserve the initial x87 control word in the global FP environment
in preparation for adjusting the default based on the main binary
version.

Fix sense of fegetexcept on x86.

Somehow I overlooked this when I fixed feenableexcept and
fedisableexcept last summer.

XXX pullup to 6

Mask off the result of feenableexcept and fedisableexcept on x86.

These shouldn't return bits outside FE_ALL_EXCEPT.

Fix compile error.

Fix merge error: drop machine from an older workaround for machine.sse
under compat32, drop the assertion, initialize oldlen.

Add support for fenv.h interface for i386 and amd64.

Submitted by Stathis Kamperis as part of GSoC 2010 and ported from
FreeBSD.