llvm-project/clang/lib/CodeGen
Richard Smith c9cbde7e8b [modules] Fix a rejects-valid resulting from emitting an inline function
recursively within the emission of another inline function. This ultimately
led to us emitting the same inline function definition twice, which we then
rejected because we believed we had a mangled name conflict.

llvm-svn: 215579
2014-08-13 21:15:09 +00:00
..
ABIInfo.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
BackendUtil.cpp Update for LLVM API change. 2014-08-04 21:33:42 +00:00
CGAtomic.cpp MS ABI: Consider alignment attributes on typedefs for layout 2014-07-30 01:30:47 +00:00
CGBlocks.cpp Objective-C. Fixes an assert where because of captured 2014-08-12 15:51:49 +00:00
CGBlocks.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGBuilder.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGBuiltin.cpp AArch64: Prefetch intrinsic 2014-08-13 19:18:20 +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 [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGCUDARuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGCXX.cpp Update for llvm API change. 2014-06-03 02:42:01 +00:00
CGCXXABI.cpp CodeGen: Refactor RTTI emission 2014-07-07 06:20:47 +00:00
CGCXXABI.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGCall.cpp Simplify a few loops over CallArgList/FunctionArgList. NFC 2014-08-13 20:06:24 +00:00
CGCall.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGClass.cpp [modules] Remove IRGen special case for emitting implicit special members if 2014-08-01 01:56:39 +00:00
CGCleanup.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGCleanup.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGDebugInfo.cpp Debuginfo: Correctly tag variadic ObjC methods with DW_TAG_unspecified_parameter. 2014-08-12 04:42:23 +00:00
CGDebugInfo.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGDecl.cpp DebugInfo: Blocks: Do not depend on LLVM argument numbering when choosing the debug info argument numbering. 2014-08-08 17:10:14 +00:00
CGDeclCXX.cpp -fms-extensions: Implement half of #pragma init_seg 2014-07-22 00:53:05 +00:00
CGException.cpp Add an AST node for __leave statements, hook it up. 2014-07-07 00:12:30 +00:00
CGExpr.cpp [Sanitizer] Introduce SanitizerMetadata class. 2014-08-01 21:35:28 +00:00
CGExprAgg.cpp PR18097: Support initializing an _Atomic(T) from an object of C++ class type T 2014-07-31 06:31:19 +00:00
CGExprCXX.cpp CodeGen: Properly null-check typeid expressions 2014-07-19 00:17:06 +00:00
CGExprComplex.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGExprConstant.cpp PR18097: Support initializing an _Atomic(T) from an object of C++ class type T 2014-07-31 06:31:19 +00:00
CGExprScalar.cpp [UBSan] Add !nosanitize metadata to the code generated by UBSan. 2014-07-17 18:46:27 +00:00
CGLoopInfo.cpp Rename metadata llvm.loop.vectorize.unroll to llvm.loop.vectorize.interleave. 2014-07-21 23:10:56 +00:00
CGLoopInfo.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGObjC.cpp Objective-C arc. Switch the Objective-C dictionary literal in ARC mode 2014-08-07 20:57:35 +00:00
CGObjCGNU.cpp Remove the overload of GetAddrOfConstantString method 2014-06-04 20:25:57 +00:00
CGObjCMac.cpp AArch64: update Clang for merged arm64/aarch64 triples. 2014-07-23 12:32:58 +00:00
CGObjCRuntime.cpp Update for llvm api change. 2014-06-04 18:51:46 +00:00
CGObjCRuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGOpenCLRuntime.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGOpenCLRuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGOpenMPRuntime.cpp [OPENMP] Improved codegen for outlined functions for 'parallel' directives. 2014-07-25 07:55:17 +00:00
CGOpenMPRuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGRecordLayout.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGRecordLayoutBuilder.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGStmt.cpp Add a state variable to the loop hint attribute. 2014-07-31 20:15:14 +00:00
CGStmtOpenMP.cpp [OPENMP] Initial parsing and sema analysis for 'atomic' directive. 2014-07-22 10:10:35 +00:00
CGVTT.cpp Remove the -fhidden-weak-vtables -cc1 option. It was dead, 2014-02-08 00:41:16 +00:00
CGVTables.cpp Simplify a few loops over CallArgList/FunctionArgList. NFC 2014-08-13 20:06:24 +00:00
CGVTables.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGValue.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CMakeLists.txt [CMake] clangCodeGen: Update libdeps to add clangLex for PPChainedCallbacks. 2014-08-05 15:01:12 +00:00
CodeGenABITypes.cpp Add coverage mapping generation. 2014-08-04 18:41:51 +00:00
CodeGenAction.cpp Revert r215331, "unique_ptrify CompilerInstance::OutputFile(s) and remove a unique_ptr around a non-owning raw_ostream in CodeGenAction::CreateASTConsumer" 2014-08-11 06:53:11 +00:00
CodeGenFunction.cpp Simplify a few loops over CallArgList/FunctionArgList. NFC 2014-08-13 20:06:24 +00:00
CodeGenFunction.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CodeGenModule.cpp Add a cc1 "dump-coverage-mapping" for testing coverage mapping. 2014-08-08 23:41:24 +00:00
CodeGenModule.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CodeGenPGO.cpp Revert r215365 - Coverage mapping: emit mapping for cxx constructors that use microsoft's ABI 2014-08-11 18:21:34 +00:00
CodeGenPGO.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CodeGenTBAA.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CodeGenTBAA.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CodeGenTypes.cpp MS ABI: Handle member function pointers returning a member data pointer 2014-08-07 22:56:13 +00:00
CodeGenTypes.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CoverageMappingGen.cpp Add a cc1 "dump-coverage-mapping" for testing coverage mapping. 2014-08-08 23:41:24 +00:00
CoverageMappingGen.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
EHScopeStack.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
ItaniumCXXABI.cpp CodeGen: Don't emit a thread-wrapper if we can't touch the backing variable 2014-07-11 20:28:10 +00:00
Makefile
MicrosoftCXXABI.cpp MS ABI: Handle member function pointers returning a member data pointer 2014-08-07 22:56:13 +00:00
ModuleBuilder.cpp [modules] Fix a rejects-valid resulting from emitting an inline function 2014-08-13 21:15:09 +00:00
README.txt
SanitizerBlacklist.cpp [UBSan] Introduce type-based blacklisting. 2014-07-10 22:34:19 +00:00
SanitizerBlacklist.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
SanitizerMetadata.cpp [ASan] Use metadata to pass source-level information from Clang to ASan. 2014-08-02 00:35:50 +00:00
SanitizerMetadata.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
TargetInfo.cpp Revert r214497: [mips] Defer va_arg expansion to the backend. 2014-08-01 13:26:28 +00:00
TargetInfo.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +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!

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