[issue1580] Use shorter float repr when possible

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Yes, I think you're right.

Perhaps the SSE2 support should be turned into an --enable-sse2 configure 
option, that's disabled by default?  One problem with this is that I don't 
know how to enable SSE2 instructions for compilers other than gcc, so the option would only apply to gcc-based systems.

Disabling SSE2 would just mean that all x86/gcc systems would end up using 
the inline assembler to get and set the control word;  so we'd still get 
short float repr everywhere we did before.

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<http://bugs.python.org/issue1580>
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