llvm-project/clang/lib/CodeGen
Alex Lorenz d672d5219a Revert "[CodeGenModule] Set dso_local for Mach-O GlobalValue"
This reverts commit 809a1e0ffd.

Mach-O doesn't support dso_local and this change broke XNU because of the use of dso_local.

Differential Revision: https://reviews.llvm.org/D98458
2021-03-17 17:27:41 -07:00
..
ABIInfo.h [ABI][NFC] Fix the confusion of ByVal and ByRef argument names 2020-08-06 15:20:18 +03:00
Address.h
BackendUtil.cpp [AIX] do not emit visibility attribute into IR when there is -mignore-xcoff-visibility 2021-03-09 10:38:00 -05:00
CGAtomic.cpp [AST] Change return type of getTypeInfoInChars to a proper struct instead of std::pair. 2020-10-13 13:26:56 +02:00
CGBlocks.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGBlocks.h [CodeGen] Simplify the way lifetime of block captures is extended 2020-06-11 16:06:22 -07:00
CGBuilder.h [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGBuiltin.cpp [AArch64][SVE/NEON] Add support for FROUNDEVEN for both NEON and fixed length SVE 2021-03-17 11:41:22 +00:00
CGCUDANV.cpp [HIP] Emit kernel symbol 2021-03-01 16:31:40 -05:00
CGCUDARuntime.cpp
CGCUDARuntime.h [HIP] Emit kernel symbol 2021-03-01 16:31:40 -05:00
CGCXX.cpp [OpaquePtrs] Remove some uses of type-less CreateLoad APIs (NFC) 2021-03-11 14:40:57 +01:00
CGCXXABI.cpp Fix PR35902: incorrect alignment used for ubsan check. 2020-12-28 18:11:17 -05:00
CGCXXABI.h [clang][aarch64] Precondition isHomogeneousAggregate on isCXX14Aggregate 2021-01-12 19:44:01 +00:00
CGCall.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGCall.h Replace `T(x)` with `reinterpret_cast<T>(x)` everywhere it means reinterpret_cast. NFC. 2020-12-22 19:54:29 -05:00
CGClass.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGCleanup.cpp [CodeGen] Simplify the way lifetime of block captures is extended 2020-06-11 16:06:22 -07:00
CGCleanup.h [XCOFF][AIX] Generate LSDA data and compact unwind section on AIX 2020-12-02 18:42:44 +00:00
CGCoroutine.cpp [Coroutines] Do not evaluate InitListExpr of a co_return 2020-03-16 12:42:44 +08:00
CGDebugInfo.cpp [DebugInfo] Add an attribute to force type info to be emitted for types that are required to be complete. 2021-03-12 12:30:01 -08:00
CGDebugInfo.h CGDebugInfo: Delete unused parameters 2021-01-11 13:39:03 -08:00
CGDecl.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGDeclCXX.cpp [clang][patch] Inclusive language, modify filename SanitizerBlacklist.h to NoSanitizeList.h 2021-02-22 15:11:37 -05:00
CGException.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGExpr.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGExprAgg.cpp [clang] Don't assert in EmitAggregateCopy on trivial_abi types 2021-03-10 10:16:06 -08:00
CGExprCXX.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGExprComplex.cpp [FPEnv] Use strictfp metadata in casting nodes 2020-11-06 11:56:12 -05:00
CGExprConstant.cpp [CGExpr] Use getCharWidth() more consistently in CCGExprConstant. NFC 2021-01-22 21:12:17 +01:00
CGExprScalar.cpp [clang] Use Constant::getAllOnesValue helper. NFCI. 2021-03-12 15:16:36 +00:00
CGGPUBuiltin.cpp [Alignment][NFC] Use Align with CreateAlignedStore 2020-01-23 17:34:32 +01:00
CGLoopInfo.cpp [Clang] Ensure vector predication loop metadata is always emitted when pragma is specified. 2021-02-13 17:35:54 -06:00
CGLoopInfo.h [SVE] Add support to vectorize_width loop pragma for scalable vectors 2021-01-08 11:37:27 +00:00
CGNonTrivialStruct.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGObjC.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGObjCGNU.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGObjCMac.cpp [CGBuilder] Remove type-less CreateAlignedLoad() APIs (NFC) 2021-03-11 10:41:23 +01:00
CGObjCRuntime.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGObjCRuntime.h [clang] Implement objc_non_runtime_protocol to remove protocol metadata 2020-10-02 17:35:50 -04:00
CGOpenCLRuntime.cpp Fix "pointer is null" static analyzer warning. NFCI. 2020-01-08 17:19:08 +00:00
CGOpenCLRuntime.h
CGOpenMPRuntime.cpp [OpenMP] Restore backwards compatibility for libomptarget 2021-03-11 09:52:11 -05:00
CGOpenMPRuntime.h [OpenMP] Add Passing in Original Declaration Names To Mapper API 2020-11-18 15:28:39 -05:00
CGOpenMPRuntimeAMDGCN.cpp [libomptarget][amdgpu] Call into deviceRTL instead of ockl 2021-01-04 16:48:47 +00:00
CGOpenMPRuntimeAMDGCN.h [OpenMP][AMDGCN] Support OpenMP offloading for AMDGCN architecture - Part 3 2020-08-03 05:38:39 +00:00
CGOpenMPRuntimeGPU.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CGOpenMPRuntimeGPU.h [OpenMP][AMDGCN] Support OpenMP offloading for AMDGCN architecture - Part 3 2020-08-03 05:38:39 +00:00
CGOpenMPRuntimeNVPTX.cpp [OpenMP][AMDGCN] Support OpenMP offloading for AMDGCN architecture - Part 3 2020-08-03 05:38:39 +00:00
CGOpenMPRuntimeNVPTX.h [OpenMP][AMDGCN] Support OpenMP offloading for AMDGCN architecture - Part 3 2020-08-03 05:38:39 +00:00
CGRecordLayout.h [ARM] Follow AACPS standard for volatile bit-fields access width 2020-10-13 10:31:48 +01:00
CGRecordLayoutBuilder.cpp [CodeGen] Use getCharWidth() more consistently in CGRecordLowering. NFC 2021-01-22 21:12:17 +01:00
CGStmt.cpp PR49585: Emit the jump destination for a for loop 'continue' from within the scope of the condition variable. 2021-03-17 16:24:04 -07:00
CGStmtOpenMP.cpp [NFC] Adjust SmallVector.h header to workaround XL build compiler issue 2021-03-12 21:41:36 -06:00
CGVTT.cpp [AMDGPU] Set the default globals address space to 1 2020-11-20 15:46:53 +00:00
CGVTables.cpp [clang][RelativeVTablesABI] Use dso_local_equivalent rather than emitting stubs 2020-11-30 16:02:35 -08:00
CGVTables.h [clang] Frontend components for the relative vtables ABI (round 2) 2020-06-11 11:17:08 -07:00
CGValue.h [AST] Change return type of getTypeInfoInChars to a proper struct instead of std::pair. 2020-10-13 13:26:56 +02:00
CMakeLists.txt Remove dependency on clangASTMatchers. 2020-09-10 22:17:48 -04:00
CodeGenABITypes.cpp [CodeGen] Add public function to emit C++ destructor call. 2020-07-01 11:01:23 -07:00
CodeGenAction.cpp [Diagnose] Unify MCContext and LLVMContext diagnosing 2021-03-01 15:58:37 -08:00
CodeGenFunction.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
CodeGenFunction.h Make iteration over the DeclContext::lookup_result safe. 2021-03-17 08:59:04 +00:00
CodeGenModule.cpp Revert "[CodeGenModule] Set dso_local for Mach-O GlobalValue" 2021-03-17 17:27:41 -07:00
CodeGenModule.h Refactor -funique-internal-linakge-names implementation. 2021-03-05 13:32:17 -08:00
CodeGenPGO.cpp Don't emit coverage mapping for excluded functions 2021-02-05 13:03:57 -08:00
CodeGenPGO.h [NFC] Make non-modifying members const. 2020-10-18 18:50:21 +02:00
CodeGenTBAA.cpp Reland Implement _ExtInt as an extended int type specifier. 2020-04-17 10:45:48 -07:00
CodeGenTBAA.h
CodeGenTypeCache.h [CGExpr] Use getCharWidth() more consistently in CCGExprConstant. NFC 2021-01-22 21:12:17 +01:00
CodeGenTypes.cpp [Clang][RISCV] Define RISC-V V builtin types 2021-02-18 10:17:31 +08:00
CodeGenTypes.h CodeGenTypes::CGRecordLayouts: Use unique_ptr to simplify memory management 2020-04-28 22:31:16 -07:00
ConstantEmitter.h attempt to fix failing buildbots after 3bab88b7ba 2020-06-15 12:58:37 +02:00
ConstantInitBuilder.cpp Fix ConstantAggregateBuilderBase::getRelativeOffset 2020-06-15 12:23:20 -07:00
CoverageMappingGen.cpp Revert "Revert "[Coverage] Emit gap region between statements if first statements contains terminate statements."" 2021-03-04 11:52:43 -08:00
CoverageMappingGen.h [Driver] Rename -fprofile-{prefix-map,compilation-dir} to -fcoverage-{prefix-map,compilation-dir} 2021-02-25 21:40:12 -08:00
EHScopeStack.h [CodeGen] Simplify the way lifetime of block captures is extended 2020-06-11 16:06:22 -07:00
ItaniumCXXABI.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
MacroPPCallbacks.cpp
MacroPPCallbacks.h
MicrosoftCXXABI.cpp [OpaquePtrs] Remove some uses of type-less CreateGEP() (NFC) 2021-03-12 21:01:16 +01:00
ModuleBuilder.cpp reland "[DebugInfo] Support to emit debugInfo for extern variables" 2019-12-22 18:28:50 -08:00
ObjectFilePCHContainerOperations.cpp [Clang] Add __STDCPP_THREADS__ to standard predefine macros 2020-11-22 16:05:53 -08:00
PatternInit.cpp Clean up usages of asserting vector getters in Type 2020-04-13 13:01:40 -07:00
PatternInit.h
README.txt Revert "This is a test commit" 2020-12-23 13:04:37 -06:00
SanitizerMetadata.cpp [clang][patch] Inclusive language, modify filename SanitizerBlacklist.h to NoSanitizeList.h 2021-02-22 15:11:37 -05:00
SanitizerMetadata.h [Analysis/Transforms/Sanitizers] As part of using inclusive language 2020-06-20 00:42:26 -07:00
SwiftCallingConv.cpp Teach the swift calling convention about _Atomic types 2020-08-31 07:07:25 -07:00
TargetInfo.cpp [SystemZ] Test for isinf and isfinite in testFPKind(). 2021-03-15 15:02:39 -06:00
TargetInfo.h [CFE, SystemZ] New target hook testFPKind() for checks of FP values. 2021-02-18 12:36:46 -06:00
VarBypassDetector.cpp [clang,NFC] Fix typos in file headers 2021-02-25 12:47:02 -08:00
VarBypassDetector.h [clang,NFC] Fix typos in file headers 2021-02-25 12:47:02 -08:00

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!

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