libobjc2

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History

theraven 84b41a8464 Added -gnu-class-lookup-cache and -gnu-class-imp-cache passes. These add caching for class messages and also skip the class lookup (using the class symbol directly) where possible. In combination, these make class messages marginally slower than function calls, rather than significantly slower than message sends.		16 years ago
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COPYING	Added LLVM optimisation passes for libobjc2.	16 years ago
ClassIMPCache.cpp	Added -gnu-class-lookup-cache and -gnu-class-imp-cache passes. These add caching for class messages and also skip the class lookup (using the class symbol directly) where possible.	16 years ago
ClassLookupCache.cpp	Added -gnu-class-lookup-cache and -gnu-class-imp-cache passes. These add caching for class messages and also skip the class lookup (using the class symbol directly) where possible.	16 years ago
IMPCacher.cpp	Added -gnu-class-lookup-cache and -gnu-class-imp-cache passes. These add caching for class messages and also skip the class lookup (using the class symbol directly) where possible.	16 years ago
IMPCacher.h	Added -gnu-class-lookup-cache and -gnu-class-imp-cache passes. These add caching for class messages and also skip the class lookup (using the class symbol directly) where possible.	16 years ago
IvarPass.cpp	Added LoopIMPCachePass. This pass automatically performs IMP caching on all loops.	16 years ago
LoopIMPCachePass.cpp	Removed some unneeded #includes.	16 years ago
Makefile	Added LLVM optimisation passes for libobjc2.	16 years ago
README	Added LLVM optimisation passes for libobjc2.	16 years ago
TypeFeedback.cpp	Added LLVM optimisation passes for libobjc2.	16 years ago

README

GNUstep Runtime Optimisations
=============================

This directory contains LLVM optimisations specific to libobjc2.  To build
them, you must copy this directory to llvm/lib/Transforms/GNURuntime (where
llvm is the root of your llvm checkout).

Running GNU make will then create GNUObjCRuntime.so.  This library can be
passed to opt to run optimisations on bitcode generated with clang or
LanguageKit.

Non-Fragile Ivar Pass
---------------------

Running `opt -gnu-nonfragile-ivar` will invoke the non-fragile instance
variable lowering pass.  This will turn non-fragile instance variable accesses,
which go via one or two indirection layers, into more fragile ones.  If a class
and all of its superclasses are present in the module then this pass will turn
indirect instance variable accesses into hard-coded ones.

For this pass to be most useful, it should be run as a link-time optimisation.

Type Feedback
-------------

Running `opt -gnu-objc-type-feedback` enables type feedback.  Objective-C
message lookups will be replaced by calls to the profiling version in the
runtime library.  The generated data can then be used for future optimisations
(speculative inlining, polymorphic inline caching, and so on), which have not
yet been written.