llvm-project/clang/lib/CodeGen
Reid Kleckner 124955aade Add -gcodeview and -gdwarf to control which type Clang emits
Summary:
By default, 'clang' emits dwarf and 'clang-cl' emits codeview.  You can
force emission of one or both by passing -gcodeview and -gdwarf to
either driver.

Reviewers: dblaikie, hans

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D11742

llvm-svn: 244097
2015-08-05 18:51:13 +00:00
..
ABIInfo.h [MIPS] Re-land the change r238200 to fix extension of integer types 2015-05-26 21:07:19 +00:00
BackendUtil.cpp Rangify for loops, NFC. 2015-08-01 19:11:36 +00:00
CGAtomic.cpp Add missing atomic libcall support. 2015-08-05 16:57:36 +00:00
CGBlocks.cpp Pass an iterator range to EmitCallArgs 2015-07-21 18:37:18 +00:00
CGBlocks.h Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGBuilder.h Removing LLVM_DELETED_FUNCTION, as MSVC 2012 was the last reason for requiring the macro. NFC; Clang edition. 2015-02-15 22:54:08 +00:00
CGBuiltin.cpp [CodeGen] Clean up CGBuiltin a bit. 2015-07-28 15:40:11 +00:00
CGCUDANV.cpp Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGCUDARuntime.cpp Pass expressions instead of argument ranges to EmitCall/EmitCXXConstructorCall. 2014-08-21 20:26:47 +00:00
CGCUDARuntime.h Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGCXX.cpp Get the dll storage class right for structors of classes exported/imported via explicit instantiation (PR23667) 2015-05-28 17:44:56 +00:00
CGCXXABI.cpp [CodeGen] Rename EmitMemberPointer to EmitMemberFunctionPointer 2015-06-23 07:31:01 +00:00
CGCXXABI.h Generating available_externally vtables for outline virtual functions 2015-07-24 04:04:49 +00:00
CGCall.cpp Use llvm::reverse to make a bunch of loops use foreach. NFC. 2015-07-30 17:22:52 +00:00
CGCall.h [CodeGen] Reuse stack space from unused function results (with more accurate unused result detection) 2015-06-08 10:23:49 +00:00
CGClass.cpp Dtor callback emitted when msan attribute not repressed for this function. 2015-08-03 22:53:11 +00:00
CGCleanup.cpp [CodeGen] Don't write into a SmallVector's uninitialized memory. 2015-08-04 12:34:30 +00:00
CGCleanup.h [MS ABI] Hook clang up to the new EH instructions 2015-07-31 17:58:45 +00:00
CGDebugInfo.cpp DI: Update for LLVM API change for local variables 2015-07-31 17:56:14 +00:00
CGDebugInfo.h [UB] Another place where we were trying to put string data into 2015-08-04 03:53:00 +00:00
CGDecl.cpp Fix a case where we forgot to make a static local variable comdat 2015-07-20 20:35:30 +00:00
CGDeclCXX.cpp Avoid clearing an empty PrioritizedCXXGlobalInits, NFC 2015-06-20 15:51:52 +00:00
CGException.cpp [CodeGen] Fold memcpy into SmallVector initializer. No functionality change. 2015-08-04 15:38:49 +00:00
CGExpr.cpp [CodeGen] Simplify creation of shuffle masks. 2015-07-28 16:25:32 +00:00
CGExprAgg.cpp Implementing C99 partial re-initialization behavior (DR-253) 2015-06-10 00:27:52 +00:00
CGExprCXX.cpp Pass an iterator range to EmitCallArgs 2015-07-21 18:37:18 +00:00
CGExprComplex.cpp Don't repeat function names in comments. NFC. 2015-08-05 06:19:26 +00:00
CGExprConstant.cpp [CodeGen] Rename EmitMemberPointer to EmitMemberFunctionPointer 2015-06-23 07:31:01 +00:00
CGExprScalar.cpp Don't repeat function names in comments. NFC. 2015-08-05 06:19:26 +00:00
CGLoopInfo.cpp Use CGLoopInfo to emit metadata for loop hint pragmas. 2015-07-27 20:10:20 +00:00
CGLoopInfo.h Use CGLoopInfo to emit metadata for loop hint pragmas. 2015-07-27 20:10:20 +00:00
CGObjC.cpp Pass an iterator range to EmitCallArgs 2015-07-21 18:37:18 +00:00
CGObjCGNU.cpp Replace push_back(Constructor(foo)) with emplace_back(foo) for non-trivial types 2015-05-29 19:42:19 +00:00
CGObjCMac.cpp Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGObjCRuntime.cpp Rely on default zero-arg value for IRBuilder::CreateCall calls to zero-arg functions 2015-07-14 17:27:39 +00:00
CGObjCRuntime.h Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGOpenCLRuntime.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGOpenCLRuntime.h Revert r240270 ("Fixed/added namespace ending comments using clang-tidy"). 2015-06-22 23:07:51 +00:00
CGOpenMPRuntime.cpp [OpenMP] Add TLS-based implementation for threadprivate directive. 2015-07-13 22:54:53 +00:00
CGOpenMPRuntime.h [OPENMP 4.0] Codegen for 'omp cancel' directive. 2015-07-06 05:50:32 +00:00
CGRecordLayout.h Respect alignment of nested bitfields 2015-07-10 17:30:00 +00:00
CGRecordLayoutBuilder.cpp Respect alignment of nested bitfields 2015-07-10 17:30:00 +00:00
CGStmt.cpp Use CGLoopInfo to emit metadata for loop hint pragmas. 2015-07-27 20:10:20 +00:00
CGStmtOpenMP.cpp [OpenMP] Add capture for threadprivate variables used in copyin clause 2015-07-27 16:38:06 +00:00
CGVTT.cpp Prune trailing LF. 2015-05-09 21:10:13 +00:00
CGVTables.cpp Rangify for loops, NFC. 2015-08-01 19:11:36 +00:00
CGVTables.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGValue.h [opaque pointer type] Update for GEP API changes in LLVM 2015-04-02 18:55:21 +00:00
CMakeLists.txt [CMake] Fill up required libs, corresponding to r241653. 2015-07-08 02:06:21 +00:00
CodeGenABITypes.cpp LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
CodeGenAction.cpp Rangify for loops, NFC. 2015-08-01 19:11:36 +00:00
CodeGenFunction.cpp [MS ABI] Hook clang up to the new EH instructions 2015-07-31 17:58:45 +00:00
CodeGenFunction.h Don't repeat function names in comments. NFC. 2015-08-05 06:19:26 +00:00
CodeGenModule.cpp Add -gcodeview and -gdwarf to control which type Clang emits 2015-08-05 18:51:13 +00:00
CodeGenModule.h LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
CodeGenPGO.cpp Switch users of the 'for (StmtRange range = stmt->children(); range; ++range)‘ pattern to range for loops. 2015-07-02 21:03:14 +00:00
CodeGenPGO.h InstrProf: Cede ownership of createProfileWeights to CGF 2015-05-02 05:00:55 +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 LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
CodeGenTypes.h LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
CoverageMappingGen.cpp Use llvm::reverse to make a bunch of loops use foreach. NFC. 2015-07-30 17:22:52 +00:00
CoverageMappingGen.h [cleanup] Re-sort *all* #include lines with llvm/utils/sort_includes.py 2015-01-14 11:29:14 +00:00
EHScopeStack.h [MS ABI] Hook clang up to the new EH instructions 2015-07-31 17:58:45 +00:00
ItaniumCXXABI.cpp Rangify for loops, NFC. 2015-08-01 19:11:36 +00:00
Makefile
MicrosoftCXXABI.cpp [MS ABI] Hook clang up to the new EH instructions 2015-07-31 17:58:45 +00:00
ModuleBuilder.cpp LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
ObjectFilePCHContainerOperations.cpp LLVM API Change: the Module always owns the DataLayout 2015-07-24 16:04:29 +00:00
README.txt
SanitizerMetadata.cpp [ASan] Initial support for Kernel AddressSanitizer 2015-06-19 12:19:07 +00:00
SanitizerMetadata.h Removing LLVM_DELETED_FUNCTION, as MSVC 2012 was the last reason for requiring the macro. NFC; Clang edition. 2015-02-15 22:54:08 +00:00
TargetInfo.cpp Fix -Wextra-semi warnings. 2015-07-22 20:46:26 +00:00
TargetInfo.h [OPENMP] Introduced type trait "__builtin_omp_required_simd_align" for default simd alignment. 2015-07-02 03:40:19 +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!

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