[PATCH] D27840: COFF: Cache the result of library searches.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc added a comment.

In https://reviews.llvm.org/D27840#624682, @ruiu wrote:

> LGTM. Impressive speedup! Maybe we could speed this up even more by caching directory contents we visited? I don't know how much time we still spend on file searching after this patch though.


File system operations have now completely disappeared from the profile (other than mmap, which has already been moved off the hot path), so I think we're done optimizing our file system operations for now.


https://reviews.llvm.org/D27840