llvm-project

History

Rong Xu a4a09b2398 [PGO] Clang part of change for context-sensitive PGO (part1) Part 1 of CSPGO change in Clang. This includes changes in clang options and calls to llvm PassManager. Tests will be committed in part2. This change needs the PassManager change in llvm. Differential Revision: https://reviews.llvm.org/D54176 llvm-svn: 355331		2019-03-04 20:21:31 +00:00
..
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	[PGO] Clang part of change for context-sensitive PGO (part1)	2019-03-04 20:21:31 +00:00
CGAtomic.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGBlocks.cpp	CodeGen: use COMDAT for block copy/destroy helpers	2019-02-22 16:29:50 +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	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGBuiltin.cpp	Fix accidentally used hard tabs. NFC	2019-02-24 18:06:10 +00:00
CGCUDANV.cpp	[HIP] change kernel stub name	2019-02-27 02:02:52 +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	[CUDA][HIP] Use device side kernel and variable names when registering them	2019-02-14 02:00:09 +00:00
CGCXX.cpp	[opaque pointer types] Pass through function types for TLS	2019-02-07 01:14:17 +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	[opaque pointer types] Pass through function types for TLS	2019-02-07 01:14:17 +00:00
CGCall.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGCall.h	[opaque pointer types] Make EmitCall pass Function Types to	2019-02-07 01:15:41 +00:00
CGClass.cpp	[opaque pointer types] Pass function types for runtime function calls.	2019-02-05 16:42:33 +00:00
CGCleanup.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +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	[opaque pointer types] Trivial changes towards CallInst requiring	2019-02-03 21:53:49 +00:00
CGDebugInfo.cpp	[CGDebugInfo] Set NonTrivial DIFlag to a c++ record if it's not trivial	2019-02-26 03:49:05 +00:00
CGDebugInfo.h	Reland r345009 "[DebugInfo] Generate debug information for labels."	2019-01-24 05:34:29 +00:00
CGDecl.cpp	CodeGen: Fix PR40605 by splitting constant struct initializers	2019-03-01 09:00:41 +00:00
CGDeclCXX.cpp	[opaque pointer types] Pass through function types for TLS	2019-02-07 01:14:17 +00:00
CGException.cpp	[opaque pointer types] Pass function types for runtime function calls.	2019-02-05 16:42:33 +00:00
CGExpr.cpp	[Driver] Allow enum SanitizerOrdinal to represent more than 64 different sanitizer checks, NFC.	2019-03-01 10:05:15 +00:00
CGExprAgg.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGExprCXX.cpp	Fix MSVC constructor call extension after `b92d290e48` (r353181).	2019-02-06 00:06:03 +00:00
CGExprComplex.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGExprConstant.cpp	[CodeGen][NFC] Update comments in CGExprConstant.cpp.	2019-02-08 21:36:04 +00:00
CGExprScalar.cpp	[CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow	2019-02-28 00:47:55 +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	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGObjC.cpp	Avoid needlessly copying a block to the heap when a block literal	2019-02-27 18:17:16 +00:00
CGObjCGNU.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGObjCMac.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGObjCRuntime.cpp	[opaque pointer types] Pass function types for runtime function calls.	2019-02-05 16:42:33 +00:00
CGObjCRuntime.h	[opaque pointer types] Pass function types for runtime function calls.	2019-02-05 16:42:33 +00:00
CGOpenCLRuntime.cpp	[OpenCL] Simplify LLVM IR generated for OpenCL blocks	2019-02-21 11:02:10 +00:00
CGOpenCLRuntime.h	[OpenCL] Simplify LLVM IR generated for OpenCL blocks	2019-02-21 11:02:10 +00:00
CGOpenMPRuntime.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +00:00
CGOpenMPRuntime.h	[opaque pointer types] Pass function types for runtime function calls.	2019-02-05 16:42:33 +00:00
CGOpenMPRuntimeNVPTX.cpp	[OPENMP][NVPTX]Use faster teams reduction algorithm.	2019-02-20 16:36:22 +00:00
CGOpenMPRuntimeNVPTX.h	[OPENMP][NVPTX]Use faster teams reduction algorithm.	2019-02-20 16:36:22 +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	PR40642: Fix determination of whether the final statement of a statement	2019-02-15 00:27:53 +00:00
CGStmtOpenMP.cpp	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +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	[CodeGen] Set construction vtable visibility after creating initializer	2019-02-11 20:13:42 +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	Remove redundant FunctionDecl argument from a couple functions.	2019-02-02 01:48:23 +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	[opaque pointer types] Trivial changes towards CallInst requiring	2019-02-03 21:53:49 +00:00
CodeGenFunction.h	[CodeGenObjC] Emit [[X alloc] init] as objc_alloc_init(X) when available	2019-02-14 19:58:37 +00:00
CodeGenModule.cpp	[PGO] Use the explicit parameter in ProfileSummary API. NFC	2019-03-01 17:50:20 +00:00
CodeGenModule.h	[CodeGenObjC] Emit [[X alloc] init] as objc_alloc_init(X) when available	2019-02-14 19:58:37 +00:00
CodeGenPGO.cpp	[MS] Don't emit coverage for deleting dtors	2019-02-26 20:42:52 +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	Fix file headers. NFC	2019-03-01 06:49:51 +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	[OpenCL] Change type of block pointer for OpenCL	2019-02-19 15:19:06 +00:00
CodeGenTypes.h	[opaque pointer types] Fix the CallInfo passed to EmitCall in some	2019-02-05 16:05:50 +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	[opaque pointer types] Cleanup CGBuilder's Create*GEP.	2019-02-09 22:22:28 +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	[opaque pointer types] Pass through function types for TLS	2019-02-07 01:14:17 +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	[OPENMP]Delay emission of the error for unsupported types.	2019-02-27 20:29:45 +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!

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