Strange counter-performance in an alternative `decimalLength9` function
9il
ilyayaroshenko at gmail.com
Fri Feb 28 06:50:55 UTC 2020
On Wednesday, 26 February 2020 at 00:50:35 UTC, Basile B. wrote:
> So after reading the translation of RYU I was interested too
> see if the decimalLength() function can be written to be
> faster, as it cascades up to 8 CMP.
>
> [...]
bsr can be done in one/two CPU operation, quite quick. But
core.bitop.bsr wouldn't be inlined. Instead, mir-core (mir.bitop:
ctlz) or LDC intrinsics llvm_ctlz can be used for to get code
with inlining.
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