[Bug math/28472] pow(10, i) accuracy

["joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28472

--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't consider special-casing 10 in pow to be reasonable.  Integrating 
better function implementations from CORE-MATH would be reasonable, but 
it's important there to take account of portability considerations not 
handled in the CORE-MATH code (glibc supports 32-bit platforms, platforms 
without all the exception macros defined, platforms where there may be 
excess precision for intermediate computations, platforms where various 
__builtin_* functions used in CORE-MATH will be expanded out-of-line and 
slow, etc., and has various ABI and namespace considerations not covered 
in the CORE-MATH code as well, so significant work would be needed to turn 
such an implementation into something suitable for glibc).  Note that for 
any such new function implementatations, having suitable benchmark inputs 
in glibc's benchmarks is important first, to demonstrate that a new 
implementation is at least as fast as well as more accurate.

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