peter klausler ce6f0303df [flang] Tuning up binary->decimal conversion
Use short division of big-radix values by powers of two when
converting values with negative unbiased exponents rather than
multiplication by smaller powers of five; this reduces the overall
outer iteration count. This change is a win across the entire range
of inputs.

Reviewed By: tskeith

Differential Revision: https://reviews.llvm.org/D83806
2020-07-14 13:22:26 -07:00
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