On Friday, 28 February 2020 at 10:11:23 UTC, Bruce Carneal wrote:
On Friday, 28 February 2020 at 06:50:55 UTC, 9il wrote:
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.
That's surprising. I just got ldc to inline core.bitop.bsr on
run.dlang.io using ldc -O3 -mcpu=native. (not sure what the
target CPU is)
Under what conditions should I be guarding against an inlining
failure?
Here's the code I used:
int main(string[] args)
{
import core.bitop : bsr;
return bsr(cast(uint)args.length);
}
BTW, I'm a huge fan of your performance work.
