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MSVC optimizations for count_digits #1890

Merged
merged 1 commit into from
Sep 21, 2020
Merged

MSVC optimizations for count_digits #1890

merged 1 commit into from
Sep 21, 2020

Commits on Sep 20, 2020

  1. MSVC optimizations for count_digits. 

    Changed the clz implementations to use xor instead of subtraction so that when
count_digits "undoes" the BSR -> CLZ translation, the optimizer is more
willing to recognize the equivalence.
Changed the data array in bsr2log10 to static since otherwise MSVC generates
code to build the array every time the function is called.
    @mwinterb
    mwinterb committed Sep 20, 2020
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