llvm-project/clang/lib/CodeGen
Douglas Gregor 6153500517 When we're emitting a constructor or destructor call from a delegating
constructor, retrieve our VTT parameter directly. Fixes PR14588 /
<rdar://problem/12867962>.

llvm-svn: 174042
2013-01-31 05:50:40 +00:00
..
ABIInfo.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
BackendUtil.cpp Since ObjCARC has been refactored into its own library with its own declaration header, we need to include the declaration header alongside Scalar.h in BackendUtil. 2013-01-28 01:36:00 +00:00
CGBlocks.cpp Use the correct field to copy/dispose a __block variable. 2013-01-22 03:56:22 +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 [ubsan] Add support for -fsanitize-blacklist 2013-01-18 11:30:38 +00:00
CGCUDANV.cpp Remove useless 'llvm::' qualifier from names like StringRef and others that are 2013-01-12 19:30:44 +00:00
CGCUDARuntime.cpp Sort all of Clang's files under 'lib', and fix up the broken headers 2012-12-04 09:13:33 +00:00
CGCUDARuntime.h CUDA: IR generation support for device stubs 2011-10-06 18:51:56 +00:00
CGCXX.cpp Sort all of Clang's files under 'lib', and fix up the broken headers 2012-12-04 09:13:33 +00:00
CGCXXABI.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
CGCXXABI.h Move the decision about the kind of CGCXXABI to make inside 2013-01-25 23:36:14 +00:00
CGCall.cpp Semantic analysis and CodeGen support for C11's _Noreturn. This is modeled as 2013-01-30 05:45:05 +00:00
CGCall.h Use the AttributeSet instead of AttributeWithIndex. 2013-01-27 02:46:53 +00:00
CGClass.cpp When we're emitting a constructor or destructor call from a delegating 2013-01-31 05:50:40 +00:00
CGCleanup.cpp Make sure we don't emit IR for unused EH cleanups. PR13359. 2012-08-02 00:10:24 +00:00
CGCleanup.h Documentation cleanup: 2012-06-15 22:10:14 +00:00
CGDebugInfo.cpp PR14566: Debug Info: avoid top level lexical blocks in functions 2013-01-26 22:16:26 +00:00
CGDebugInfo.h Implement OpenCL event_t as Clang builtin type, including event_t related OpenCL restrictions (OpenCL 1.2 spec 6.9) 2013-01-20 12:31:11 +00:00
CGDecl.cpp When we're emitting a constructor or destructor call from a delegating 2013-01-31 05:50:40 +00:00
CGDeclCXX.cpp [ubsan] Add support for -fsanitize-blacklist 2013-01-18 11:30:38 +00:00
CGException.cpp Re-sort all the headers. Lots of regressions have crept in here. 2013-01-19 08:09:44 +00:00
CGExpr.cpp Make sure that the Attribute object represents one attribute only. 2013-01-31 00:30:05 +00:00
CGExprAgg.cpp patch for PR9027 and // rdar://11861085 2013-01-25 23:57:05 +00:00
CGExprCXX.cpp When we're emitting a constructor or destructor call from a delegating 2013-01-31 05:50:40 +00:00
CGExprComplex.cpp Implement OpenCL event_t as Clang builtin type, including event_t related OpenCL restrictions (OpenCL 1.2 spec 6.9) 2013-01-20 12:31:11 +00:00
CGExprConstant.cpp Add a new LangOpt NativeHalfType. This option allows for native half/fp16 2013-01-23 11:56:20 +00:00
CGExprScalar.cpp [ubsan] Implement the -fcatch-undefined-behavior flag using a trapping 2013-01-29 23:31:22 +00:00
CGObjC.cpp Remove useless 'llvm::' qualifier from names like StringRef and others that are 2013-01-12 19:30:44 +00:00
CGObjCGNU.cpp Remove useless 'llvm::' qualifier from names like StringRef and others that are 2013-01-12 19:30:44 +00:00
CGObjCMac.cpp Make sure that the Attribute object represents one attribute only. 2013-01-31 00:30:05 +00:00
CGObjCRuntime.cpp Rework the bitfield access IR generation to address PR13619 and 2012-12-06 11:14:44 +00:00
CGObjCRuntime.h objectiveC++: When throwing c++ exception of 2013-01-10 19:02:56 +00:00
CGOpenCLRuntime.cpp Implement OpenCL event_t as Clang builtin type, including event_t related OpenCL restrictions (OpenCL 1.2 spec 6.9) 2013-01-20 12:31:11 +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 The standard ARM C++ ABI dictates that inline functions are 2013-01-25 22:31:03 +00:00
CGRecordLayout.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
CGRecordLayoutBuilder.cpp First pass at abstracting out a class for the target C++ ABI. 2013-01-25 22:30:49 +00:00
CGStmt.cpp PR14566: Debug Info: avoid top level lexical blocks in functions 2013-01-26 22:16:26 +00:00
CGVTT.cpp simplify a bunch of code to use the well-known LLVM IR types computed by CodeGenModule. 2012-02-07 00:39:47 +00:00
CGVTables.cpp The standard ARM C++ ABI dictates that inline functions are 2013-01-25 22:31:03 +00:00
CGVTables.h The standard ARM C++ ABI dictates that inline functions are 2013-01-25 22:31:03 +00:00
CGValue.h patch for PR9027 and // rdar://11861085 2013-01-25 23:57:05 +00:00
CMakeLists.txt clang/lib: [CMake] Update tblgen'd dependencies. 2012-07-27 06:18:33 +00:00
CodeGenAction.cpp Remove useless 'llvm::' qualifier from names like StringRef and others that are 2013-01-12 19:30:44 +00:00
CodeGenFunction.cpp PR14566: Debug Info: avoid top level lexical blocks in functions 2013-01-26 22:16:26 +00:00
CodeGenFunction.h When we're emitting a constructor or destructor call from a delegating 2013-01-31 05:50:40 +00:00
CodeGenModule.cpp Make sure that the Attribute object represents one attribute only. 2013-01-31 00:30:05 +00:00
CodeGenModule.h Make sure that the Attribute object represents one attribute only. 2013-01-31 00:30:05 +00:00
CodeGenTBAA.cpp Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
CodeGenTBAA.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
CodeGenTypes.cpp Add a new LangOpt NativeHalfType. This option allows for native half/fp16 2013-01-23 11:56:20 +00:00
CodeGenTypes.h Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
ItaniumCXXABI.cpp Make sure that the Attribute object represents one attribute only. 2013-01-31 00:30:05 +00:00
Makefile
MicrosoftCXXABI.cpp The standard ARM C++ ABI dictates that inline functions are 2013-01-25 22:31:03 +00:00
ModuleBuilder.cpp Rewrite #includes for llvm/Foo.h to llvm/IR/Foo.h as appropriate to 2013-01-02 11:45:17 +00:00
README.txt
TargetInfo.cpp [mips] Do not emit i32 padding if target ABI is O32. This was causing backend 2013-01-24 21:47:33 +00:00
TargetInfo.h Fix the required args count for variadic blocks. 2012-12-07 07:03:17 +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!

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