On Tuesday, 2 June 2015 at 12:27:38 UTC, Manu wrote:
On 2 June 2015 at 05:39, Walter Bright via Digitalmars-d
<[email protected]> wrote:
https://issues.dlang.org/show_bug.cgi?id=14641
Manu, our resident god of vector instructions, do you want to
take this on?
How do you measure this? Is there a convenient setup that will
produce
a realistic test environment?
This is more awkward in C than in D, it needs a different
implementation for each compiler... will DMD's CI build with all
common C compilers to prove that the implementations are
correct?
Well, I discussed that with clang people a while ago and here are
how they do it and their measurement :
You go though character and look for a '/'. When you hit one, you
check if the character before it is a *, and if so, you have the
end of the comment. There is obviously various edges cases to
take into account, but that is the general idea.
You can find the code in Lexer::SkipBlockComment in
clang/lib/Lex/Lexer.cpp
Various benchmark on their side have shown that alignment is
desirable before having vector operations to kick in. They used
to have an AVX implementation, but it seems to be gone now, I'm
not sure why at this stage.
