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Using user-defined floating-point like Boost.Multiprecision has a very high run-time cost.
To give some flavour of this:
Table 22.3. Linpack Benchmark
|
floating-point type |
speed Mflops |
|---|---|
|
double |
2727 |
|
__float128 |
35 |
|
multiprecision::float128 |
35 |
|
multiprecision::cpp_bin_float_quad |
6 |