tree e2adb77592d2ddee72f3b478e9cf380fa7a2a44a
parent 5f8e3302242cf94de2f8e46d10167f57fcf747c3
author Douglas Gregor <dgregor@apple.com> 1240693457 +0000
committer Douglas Gregor <dgregor@apple.com> 1240693457 +0000

PCH optimization for the identifier table, where we separate
"interesting" identifiers (e.g., those where the IdentifierInfo has
some useful information) from "uninteresting" identifiers (where the
IdentifierInfo is just a name). This makes the hash table smaller (so
searching in it should be faster) and, when loading "uninteresting"
identifiers, we skip the lookup in the hash table.

PCH file size is slightly smaller than before (since we don't emit the
contents of the uninteresting IdentifierInfo structures). The
Cocoa.h-prefixed "Hello, World" doesn't show any speedup, although
we're getting to the point where system noise is a bit issue.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70075 91177308-0d34-0410-b5e6-96231b3b80d8