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| author | Douglas Gregor <dgregor@apple.com> | 2009-01-26 22:44:13 +0000 |
|---|---|---|
| committer | Douglas Gregor <dgregor@apple.com> | 2009-01-26 22:44:13 +0000 |
| commit | 5ac8aff3d7431dc7e4d64d960574a10c9f7e0078 (patch) | |
| tree | 0d53de6ca54215a3940a376038efee1eed32af42 /lib/Lex/Preprocessor.cpp | |
| parent | 7216dc9cb49f47254595120cf15a737cee53f0bd (diff) | |
Some micro-optimizations for DISABLE_SMART_POINTERS:
- When it's safe, ActionResult uses the low bit of the pointer for
the "invalid" flag rather than a separate "bool" value. This keeps
GCC from generating some truly awful code, for a > 3x speedup in the
result-passing microbenchmark.
- When DISABLE_SMART_POINTERS is defined, store an ActionResult
within ASTOwningResult rather than an ASTOwningPtr. Brings the
performance benefits of the above to smart pointers with
DISABLE_SMART_POINTERS defined.
Sadly, these micro-benchmark performance improvements don't seem to
make much of a difference on Cocoa.h right now. However, they're
harmless and might help with future optimizations.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63061 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Lex/Preprocessor.cpp')
0 files changed, 0 insertions, 0 deletions