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llvm-project/clang/lib/CodeGen
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Aaron Ballman 9371dd2287 [C++11] Replacing BlockDecl iterators capture_begin() and capture_end() with iterator_range captures(). Updating all of the usages of the iterators with range-based for loops. 
llvm-svn: 203958
 		2014-03-14 18:34:04 +00:00
..
ABIInfo.h Sort all the #include lines with LLVM's utils/sort_includes.py which 2014-01-07 11:51:46 +00:00
BackendUtil.cpp Don't recompute inlining threshold - use new overload provided by LLVM 2014-03-12 16:30:34 +00:00
CGAtomic.cpp CodeGen: use symbolic enumerators for memory order 2014-03-13 19:25:52 +00:00
CGBlocks.cpp [C++11] Replacing BlockDecl iterators capture_begin() and capture_end() with iterator_range captures(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 18:34:04 +00:00
CGBlocks.h Remove useless 'llvm::' qualifier from names like StringRef and others that are 2013-01-12 19:30:44 +00:00
CGBuilder.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
CGBuiltin.cpp Update for IR: add a second AtomicOrdering to cmpxchg insts. 2014-03-11 10:49:03 +00:00
CGCUDANV.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CGCUDARuntime.cpp CodeGen: Initial instrumentation based PGO implementation 2014-01-06 22:27:43 +00:00
CGCUDARuntime.h CUDA: IR generation support for device stubs 2011-10-06 18:51:56 +00:00
CGCXX.cpp [C++11] Replacing CXXRecordDecl iterators bases_begin() and bases_end() with iterator_range bases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 15:41:46 +00:00
CGCXXABI.cpp Sema: Do not assert when dereferencing member pointer using virtual inheritance with an incomplete class type 2014-02-20 23:22:07 +00:00
CGCXXABI.h Fix PR19104: Incorrect handling of non-virtual calls of virtual methods 2014-03-14 17:43:37 +00:00
CGCall.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CGCall.h [ms-cxxabi] Use inalloca on win32 when passing non-trivial C++ objects 2014-02-01 00:04:45 +00:00
CGClass.cpp [C++11] Replacing CXXRecordDecl iterators vbases_begin() and vbases_end() with iterator_range vbases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 16:15:17 +00:00
CGCleanup.cpp [C++11] Update Clang for the change to LLVM's Use-Def chain iterators in 2014-03-09 03:16:50 +00:00
CGCleanup.h Fix leak in lib/CodeGen/CGException.cpp, PR18318 2014-01-09 09:22:32 +00:00
CGDebugInfo.cpp [C++11] Replacing BlockDecl iterators capture_begin() and capture_end() with iterator_range captures(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 18:34:04 +00:00
CGDebugInfo.h [Layering] Update include of DebugInfo.h which moved to the IR library 2014-03-06 00:46:56 +00:00
CGDecl.cpp [C++11] Replacing BlockDecl iterators capture_begin() and capture_end() with iterator_range captures(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 18:34:04 +00:00
CGDeclCXX.cpp [ms-cxxabi] Use x86_cdeclmethodcc for __cdecl methods on win32 2014-01-31 22:54:50 +00:00
CGException.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CGExpr.cpp Sema: Do not assert when dereferencing member pointer using virtual inheritance with an incomplete class type 2014-02-20 23:22:07 +00:00
CGExprAgg.cpp [C++11] Replacing RecordDecl iterators field_begin() and field_end() with iterator_range fields(). Updating all of the usages of the iterators with range-based for loops. 2014-03-08 20:12:42 +00:00
CGExprCXX.cpp Fix PR19104: Incorrect handling of non-virtual calls of virtual methods 2014-03-14 17:43:37 +00:00
CGExprComplex.cpp Change PGO instrumentation to compute counts in a separate AST traversal. 2014-02-17 19:21:09 +00:00
CGExprConstant.cpp [C++11] Replacing CXXRecordDecl iterators vbases_begin() and vbases_end() with iterator_range vbases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 16:15:17 +00:00
CGExprScalar.cpp Update for IR: add a second AtomicOrdering to cmpxchg insts. 2014-03-11 10:49:03 +00:00
CGObjC.cpp [C++11] Replacing ObjCImplementationDecl iterators init_begin() and init_end() with iterator_range inits(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 17:35:02 +00:00
CGObjCGNU.cpp [C++11] Replacing ObjCCategoryDecl iterators propimpl_begin() and propimpl_end() with iterator_range property_impls(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 15:02:45 +00:00
CGObjCMac.cpp [C++11] Replacing BlockDecl iterators capture_begin() and capture_end() with iterator_range captures(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 18:34:04 +00:00
CGObjCRuntime.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CGObjCRuntime.h Refactor linkage computation in CGObjCMac.cpp. 2014-02-26 22:25:45 +00:00
CGOpenCLRuntime.cpp The OpenCL specification states that images are allocated 2014-01-09 13:37:30 +00:00
CGOpenCLRuntime.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
CGRTTI.cpp [C++11] Replacing CXXRecordDecl iterators bases_begin() and bases_end() with iterator_range bases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 15:41:46 +00:00
CGRecordLayout.h Correct hyphenations in comments and assert messages 2013-12-05 04:47:09 +00:00
CGRecordLayoutBuilder.cpp [C++11] Replacing CXXRecordDecl iterators vbases_begin() and vbases_end() with iterator_range vbases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 16:15:17 +00:00
CGStmt.cpp [C++11] Replacing DeclStmt iterators decl_begin() and decl_end() with iterator_range decls(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 17:01:24 +00:00
CGVTT.cpp Remove the -fhidden-weak-vtables -cc1 option. It was dead, 2014-02-08 00:41:16 +00:00
CGVTables.cpp Replace OwningPtr with std::unique_ptr. 2014-03-07 20:03:18 +00:00
CGVTables.h MS ABI: Mangle member pointer template arguments 2014-02-05 17:27:08 +00:00
CGValue.h Simplify atomic load/store IRGen. 2013-07-11 01:32:21 +00:00
CMakeLists.txt [CMake] Use LINK_LIBS instead of target_link_libraries(). 2014-02-26 06:41:29 +00:00
CodeGenABITypes.cpp [ms-cxxabi] Use x86_cdeclmethodcc for __cdecl methods on win32 2014-01-31 22:54:50 +00:00
CodeGenAction.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CodeGenFunction.cpp [C++11] Replacing DeclBase iterators specific_attr_begin() and specific_attr_end() with iterator_range specific_attrs(). Updating all of the usages of the iterators with range-based for loops. 2014-03-10 17:08:28 +00:00
CodeGenFunction.h [Modules] Update to reflect ValueHandle moving to the IR library in LLVM 2014-03-04 11:18:19 +00:00
CodeGenModule.cpp [C++11] Replacing ObjCCategoryDecl iterators propimpl_begin() and propimpl_end() with iterator_range property_impls(). Updating all of the usages of the iterators with range-based for loops. 2014-03-14 15:02:45 +00:00
CodeGenModule.h Revert "CodeGen: Use a binary format for instrumentation based profiling" 2014-03-12 21:06:31 +00:00
CodeGenPGO.cpp Revert "CodeGen: Use a binary format for instrumentation based profiling" 2014-03-12 21:06:31 +00:00
CodeGenPGO.h Revert "CodeGen: Use a binary format for instrumentation based profiling" 2014-03-12 21:06:31 +00:00
CodeGenTBAA.cpp Add a mangler entry point for TBAA rather than using RTTI directly 2013-11-19 23:23:00 +00:00
CodeGenTBAA.h Fixed comment typo. 2013-06-08 00:27:19 +00:00
CodeGenTypes.cpp [C++11] Replacing CXXRecordDecl iterators bases_begin() and bases_end() with iterator_range bases(). Updating all of the usages of the iterators with range-based for loops. 2014-03-13 15:41:46 +00:00
CodeGenTypes.h [ms-cxxabi] Use inalloca on win32 when passing non-trivial C++ objects 2014-02-01 00:04:45 +00:00
EHScopeStack.h [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
ItaniumCXXABI.cpp Fix PR19104: Incorrect handling of non-virtual calls of virtual methods 2014-03-14 17:43:37 +00:00
Makefile
…
MicrosoftCXXABI.cpp Fix PR19104: Incorrect handling of non-virtual calls of virtual methods 2014-03-14 17:43:37 +00:00
ModuleBuilder.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
README.txt
…
TargetInfo.cpp AArch64_be varargs processing for ARM ABI 2014-03-14 11:51:06 +00:00
TargetInfo.h Sort all the #include lines with LLVM's utils/sort_includes.py which 2014-01-07 11:51:46 +00:00

README.txt 

IRgen optimization opportunities.

//===---------------------------------------------------------------------===//

The common pattern of
--
short x; // or char, etc
(x == 10)
--
generates an zext/sext of x which can easily be avoided.

//===---------------------------------------------------------------------===//

Bitfields accesses can be shifted to simplify masking and sign
extension. For example, if the bitfield width is 8 and it is
appropriately aligned then is is a lot shorter to just load the char
directly.

//===---------------------------------------------------------------------===//

It may be worth avoiding creation of alloca's for formal arguments
for the common situation where the argument is never written to or has
its address taken. The idea would be to begin generating code by using
the argument directly and if its address is taken or it is stored to
then generate the alloca and patch up the existing code.

In theory, the same optimization could be a win for block local
variables as long as the declaration dominates all statements in the
block.

NOTE: The main case we care about this for is for -O0 -g compile time
performance, and in that scenario we will need to emit the alloca
anyway currently to emit proper debug info. So this is blocked by
being able to emit debug information which refers to an LLVM
temporary, not an alloca.

//===---------------------------------------------------------------------===//

We should try and avoid generating basic blocks which only contain
jumps. At -O0, this penalizes us all the way from IRgen (malloc &
instruction overhead), all the way down through code generation and
assembly time.

On 176.gcc:expr.ll, it looks like over 12% of basic blocks are just
direct branches!

//===---------------------------------------------------------------------===//