f839bac29c
on i386 (A64), 5 cycles on amd64 (A64), and 3 cycles on ia64). gcc tends to generate very bad code for accessing floating point values as bits except when the integer accesses have the same width as the floating point values, and direct accesses to bit-fields (as is common only for long double precision) always gives such accesses. Use the expsign access method, which is good for 80-bit long doubles and hopefully no worse for 128-bit long doubles. Now the generated code is less bad. There is still unnecessary copying of the arg on amd64 and i386 and mysterious extra slowness on amd64.
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