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History

Hsiangkai Wang 3575149092 Reland r345009 "[DebugInfo] Generate debug information for labels." Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. After fixing problems in LiveDebugVariables. After fixing NULL symbol problems in AddressPool when enabling split-dwarf-file. After fixing PR39094. After landing D54199 and D54465 to fix Chromium build failed. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 352025		2019-01-24 05:34:29 +00:00
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ABIInfo.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
Address.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
BackendUtil.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGAtomic.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGBlocks.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGBlocks.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGBuilder.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGBuiltin.cpp	[X86] Replace VPCOM/VPCOMU with generic integer comparisons (clang)	2019-01-20 16:40:33 +00:00
CGCUDANV.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCUDARuntime.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCUDARuntime.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCXX.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCXXABI.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCXXABI.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCall.cpp	[Sanitizers] UBSan unreachable incompatible with ASan in the presence of `noreturn` calls	2019-01-24 01:06:19 +00:00
CGCall.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGClass.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCleanup.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCleanup.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGCoroutine.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGDebugInfo.cpp	Reland r345009 "[DebugInfo] Generate debug information for labels."	2019-01-24 05:34:29 +00:00
CGDebugInfo.h	Reland r345009 "[DebugInfo] Generate debug information for labels."	2019-01-24 05:34:29 +00:00
CGDecl.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGDeclCXX.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGException.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGExpr.cpp	[ubsan] Check the correct size when sanitizing array new.	2019-01-23 03:37:29 +00:00
CGExprAgg.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGExprCXX.cpp	[ubsan] Check the correct size when sanitizing array new.	2019-01-23 03:37:29 +00:00
CGExprComplex.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGExprConstant.cpp	[CodeGen] Always use string computed in Sema for PredefinedExpr	2019-01-22 00:11:17 +00:00
CGExprScalar.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGGPUBuiltin.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGLoopInfo.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGLoopInfo.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGNonTrivialStruct.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGObjC.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGObjCGNU.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGObjCMac.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGObjCRuntime.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGObjCRuntime.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenCLRuntime.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenCLRuntime.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenMPRuntime.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenMPRuntime.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenMPRuntimeNVPTX.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGOpenMPRuntimeNVPTX.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGRecordLayout.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGRecordLayoutBuilder.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGStmt.cpp	Reland r345009 "[DebugInfo] Generate debug information for labels."	2019-01-24 05:34:29 +00:00
CGStmtOpenMP.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGVTT.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGVTables.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGVTables.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGValue.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CMakeLists.txt	[CodeGen] Fix -DBUILD_SHARED_LIBS=on build after rC348907	2018-12-12 06:07:33 +00:00
CodeGenABITypes.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenAction.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenFunction.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenFunction.h	[ubsan] Check the correct size when sanitizing array new.	2019-01-23 03:37:29 +00:00
CodeGenModule.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenModule.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenPGO.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenPGO.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenTBAA.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenTBAA.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenTypeCache.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenTypes.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CodeGenTypes.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ConstantEmitter.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ConstantInitBuilder.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CoverageMappingGen.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CoverageMappingGen.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
EHScopeStack.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ItaniumCXXABI.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
MacroPPCallbacks.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
MacroPPCallbacks.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
MicrosoftCXXABI.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ModuleBuilder.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ObjectFilePCHContainerOperations.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
README.txt	…
SanitizerMetadata.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
SanitizerMetadata.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
SwiftCallingConv.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
TargetInfo.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
TargetInfo.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
VarBypassDetector.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
VarBypassDetector.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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!

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