A patch for libm-ieee754

[David Edelsohn]

>>>>> Geoffrey KEATING writes:

Geoff> Do _not_ mark the variables 'volatile'.  This causes a performance
Geoff> reduction on sparc and powerpc, and probably on alpha and x86 too,
Geoff> because of the memory traffic it generates.

	On PowerPC you probably also need -mno-fused-madd option to
disable use of the fma, etc. instructions because of the intermediate
extended precision.  Note that this will halve FP performance in some
cases. 

David