On Wednesday, 12 October 2016 at 20:02:16 UTC, safety0ff wrote:
On Wednesday, 12 October 2016 at 16:24:19 UTC, Andrei
Alexandrescu wrote:
Remember the ASCII part is the bothersome one. There's only
two comparisons, all with 100% predictability. We should be
able to arrange matters so the loss is negligible. -- Andrei
My measurements:
ldc -O3 -boundscheck=off -release -mcpu=native -enable-inlining
ldc version 1.0.0
overhead 0.350s
bytes 0.385s
current autodecoding 0.915s (with new LUT popFront)
copy-pasting std.utf decoding functions into current file 0.840s
adding ASCII branch hints (llvm_expect) 0.770s
With the branch hints LDC moves the non-Ascii code outside of
the loop and creates a really tight loop body.
where did you apply the branch hints ?
