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This allows clients to avoid an unnecessary fs::status() call on each directory entry. Because the information returned by FindFirstFileEx is a subset of the information returned by a regular status() call, I needed to extract a base class from file_status that contains only that information. On my machine, this reduces the time required to enumerate a ThinLTO cache directory containing 520k files from almost 4 minutes to less than 2 seconds. Differential Revision: https://reviews.llvm.org/D38716 llvm-svn: 315378
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.