llvm-project/clang/lib/CodeGen
Yaron Keren 8b563665c3 Replace double negation of !FileID.isInvalid() with FileID.isValid().
+couple more of double-negated !SourceLocation.isInvalid() unfixed in r249228.

llvm-svn: 249235
2015-10-03 10:46:20 +00:00
..
ABIInfo.h Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
Address.h Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
BackendUtil.cpp Replace a loop and temporary string copying with llvm::join. 2015-09-26 01:25:08 +00:00
CGAtomic.cpp Decorating vptr load & stores with !invariant.group 2015-09-15 21:46:55 +00:00
CGBlocks.cpp When comparing two block captures for layout, don't crash 2015-09-11 22:00:51 +00:00
CGBlocks.h Move BlockByrefHelpers back to CodeGenModule.h to placate MSVC. 2015-09-08 08:21:11 +00:00
CGBuilder.h Remove unnecessary braces; this resolves against a 2015-09-08 08:57:00 +00:00
CGBuiltin.cpp [WebAssembly] Add a __builtin_wasm_resize_memory() intrinsic. 2015-10-02 20:20:01 +00:00
CGCUDANV.cpp Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +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 Revert "Always_inline codegen rewrite" and 2 follow-ups. 2015-09-14 21:35:16 +00:00
CGCXXABI.cpp [WinEH] Pass the catch adjectives to catchpad directly 2015-09-16 20:15:55 +00:00
CGCXXABI.h [WinEH] Pass the catch adjectives to catchpad directly 2015-09-16 20:15:55 +00:00
CGCall.cpp Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
CGCall.h Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CGClass.cpp Emiting invariant.group.barrier for ctors bugfix 2015-10-02 22:12:40 +00:00
CGCleanup.cpp [SEH] Use cleanupendpad so that WinEHPrepare gets the coloring right 2015-09-10 22:11:13 +00:00
CGCleanup.h [WinEH] Pass the catch adjectives to catchpad directly 2015-09-16 20:15:55 +00:00
CGDebugInfo.cpp Module debugging: Don't emit forward declarations in module scopes. 2015-10-02 17:36:14 +00:00
CGDebugInfo.h Fix Clang-tidy modernize-use-nullptr warnings in headers and generated files; other minor cleanups. 2015-09-29 20:56:43 +00:00
CGDecl.cpp [OpenCL 2.0] Enable program scope variables, Section 6.5.1. 2015-09-30 14:08:20 +00:00
CGDeclCXX.cpp Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CGException.cpp Use the MSVC SEH personalities on Mingw 2015-09-17 17:04:13 +00:00
CGExpr.cpp Honor the casted-to alignment of an explicit cast even when 2015-09-29 04:37:40 +00:00
CGExprAgg.cpp Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
CGExprCXX.cpp Don't crash when a reserved global placement operator new is paired 2015-09-29 23:55:17 +00:00
CGExprComplex.cpp Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
CGExprConstant.cpp Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CGExprScalar.cpp Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
CGLoopInfo.cpp Add new llvm.loop.unroll.enable metadata for use with "#pragma unroll". 2015-08-10 17:29:39 +00:00
CGLoopInfo.h Add new llvm.loop.unroll.enable metadata for use with "#pragma unroll". 2015-08-10 17:29:39 +00:00
CGObjC.cpp ARC: Fix the precise-lifetime suppression of returns_inner_pointer 2015-09-09 23:37:17 +00:00
CGObjCGNU.cpp Revert "[opaque pointer type] update for LLVM API change" 2015-09-14 18:02:04 +00:00
CGObjCMac.cpp Don't nil check non-nil class receiver of AArch64 stret calls. 2015-10-02 22:41:59 +00:00
CGObjCRuntime.cpp Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CGObjCRuntime.h Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CGOpenCLRuntime.cpp [OpenCL] Add new types for OpenCL 2.0. 2015-09-15 11:18:52 +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] Target directive host codegen. 2015-10-02 16:14:20 +00:00
CGOpenMPRuntime.h [OpenMP] Target directive host codegen. 2015-10-02 16:14:20 +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 convert builtin_unpredictable on a switch into metadata for LLVM 2015-09-09 22:39:06 +00:00
CGStmtOpenMP.cpp [OpenMP] Target directive host codegen. 2015-10-02 16:14:20 +00:00
CGVTT.cpp Remove and forbid raw_svector_ostream::flush() calls. 2015-08-13 18:12:56 +00:00
CGVTables.cpp Generating assumption loads of vptr after ctor call (fixed) 2015-09-15 00:37:06 +00:00
CGVTables.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGValue.h Introduce __builtin_nontemporal_store and __builtin_nontemporal_load. 2015-09-08 23:52:33 +00:00
CMakeLists.txt [CMake] Fill up required libs, corresponding to r241653. 2015-07-08 02:06:21 +00:00
CodeGenABITypes.cpp Unique-pointerify these pointers an plug a memory leak. 2015-09-28 23:56:10 +00:00
CodeGenAction.cpp [CUDA] Postprocess bitcode linked in during device-side CUDA compilation. 2015-09-10 18:24:23 +00:00
CodeGenFunction.cpp Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
CodeGenFunction.h [OpenMP] Target directive host codegen. 2015-10-02 16:14:20 +00:00
CodeGenModule.cpp Replace double-negated !SourceLocation.isInvalid() with SourceLocation.isValid(). 2015-10-03 05:15:57 +00:00
CodeGenModule.h Fix Clang-tidy modernize-use-nullptr warnings in headers and generated files; other minor cleanups. 2015-09-29 20:56:43 +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 Remove and forbid raw_svector_ostream::flush() calls. 2015-08-13 18:12:56 +00:00
CodeGenTBAA.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CodeGenTypeCache.h Compute and preserve alignment more faithfully in IR-generation. 2015-09-08 08:05:57 +00:00
CodeGenTypes.cpp [OpenCL] Add new types for OpenCL 2.0. 2015-09-15 11:18:52 +00:00
CodeGenTypes.h Remove superfluous private:, TypeCache is private by default. 2015-08-13 07:12:03 +00:00
CoverageMappingGen.cpp Replace double negation of !FileID.isInvalid() with FileID.isValid(). 2015-10-03 10:46:20 +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 [SEH] Use cleanupendpad so that WinEHPrepare gets the coloring right 2015-09-10 22:11:13 +00:00
ItaniumCXXABI.cpp Revert "Decorating virtual functions load with invariant.load" and fix 2015-10-01 12:58:41 +00:00
Makefile
MicrosoftCXXABI.cpp [WinEH] Pass the catch adjectives to catchpad directly 2015-09-16 20:15:55 +00:00
ModuleBuilder.cpp Rename DescriptionString -> DataLayoutString as it matches the actual 2015-08-05 23:48:05 +00:00
ObjectFilePCHContainerOperations.cpp Module Debugging: Use the clang module signature as the module's dwo_id 2015-09-22 23:26:43 +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 Support __builtin_ms_va_list. 2015-09-17 20:55:33 +00:00
TargetInfo.h Fix Clang-tidy modernize-use-nullptr warnings in headers and generated files; other minor cleanups. 2015-09-29 20:56:43 +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!

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