Profile-guided optimization (PGO)
David Nadlinger via digitalmars-d-ldc
digitalmars-d-ldc at puremagic.com
Sun Dec 13 05:21:33 PST 2015
On 11 Dec 2015, at 1:38, Johan Engelen via digitalmars-d-ldc wrote:
> What do you think about "llvm-profdata"? Should we ship that with LDC?
Yes, we should probably ship it with the binary packages. For distro
packages, we are of course dependent on the LLMV packages to include the
tools, but at least the Homebrew package actually does.
What is left to do before we can merge a first version into the main
repository? A partial list:
- Deal with the remaining FIXME comments (at least open separate
GitHub issues for them), as well as with commented-out fragments from
the Clang implementation.
- Find some way to avoid ICE-type regressions on real-world D code,
for example by building the druntime/Phobos unit tests with
- Decide on a name for the command line switches. The GCC-style "-f"
prefix isn't currently used for most of the options, but that's not
necessarily much of an argument.
On a rather unrelated note, did you try whether the profile data also
gives sensible results with llvm-cov? If yes, that might be something
nice to mention in that upcoming announcement, even though we also have
DMD-style -cov support, of course.
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