[all-commits] [llvm/llvm-project] ce6f03: [flang] Tuning up binary->decimal conversion

[Peter Klausler via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ce6f0303df51667f42a2a63eb292ab7c0c125eea
      https://github.com/llvm/llvm-project/commit/ce6f0303df51667f42a2a63eb292ab7c0c125eea
  Author: peter klausler <pklausler at nvidia.com>
  Date:   2020-07-14 (Tue, 14 Jul 2020)

  Changed paths:
    M flang/include/flang/Decimal/decimal.h
    M flang/lib/Decimal/big-radix-floating-point.h
    M flang/lib/Decimal/binary-to-decimal.cpp

  Log Message:
  -----------
  [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