llvm-project/clang/lib/CodeGen
Joerg Sonnenberger 27173288c2 Under duress, move check for target support of __builtin_setjmp/
__builtin_longjmp to Sema as requested by John McCall.

llvm-svn: 231986
2015-03-11 23:46:32 +00:00
..
ABIInfo.h Fix invalid calling convention used for libcalls on ARM. 2014-12-02 16:04:58 +00:00
BackendUtil.cpp Try to fix the build after removing DataLayoutPass 2015-03-04 19:10:41 +00:00
CGAtomic.cpp Silence an MSVC warning about not all control paths returning a value; NFC. 2015-02-27 13:55:58 +00:00
CGBlocks.cpp Prefer SmallVector::append/insert over push_back loops. Clang edition. 2015-02-17 16:48:30 +00:00
CGBlocks.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +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 Under duress, move check for target support of __builtin_setjmp/ 2015-03-11 23:46:32 +00:00
CGCUDANV.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-12 06:41:41 +00:00
CGCUDARuntime.cpp Pass expressions instead of argument ranges to EmitCall/EmitCXXConstructorCall. 2014-08-21 20:26:47 +00:00
CGCUDARuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGCXX.cpp Don't use a doc comment in a function body. 2015-01-12 21:22:27 +00:00
CGCXXABI.cpp Split catch IRgen into ItaniumCXXABI and MicrosoftCXXABI 2015-03-03 19:21:04 +00:00
CGCXXABI.h MS ABI: Implement support for throwing a C++ exception 2015-03-05 00:46:22 +00:00
CGCall.cpp MS ABI: Implement copy-ctor closures, finish implementing throw 2015-03-11 18:36:39 +00:00
CGCall.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGClass.cpp Sema: Parenthesized bound destructor member expressions can be called 2015-02-25 17:36:15 +00:00
CGCleanup.cpp Revert accidental commit. 2015-02-17 16:53:08 +00:00
CGCleanup.h Remove two unused methods. No behavior change. 2015-02-22 00:27:32 +00:00
CGDebugInfo.cpp DebugInfo: Give externally defined types a size and alignment where 2015-03-01 22:07:04 +00:00
CGDebugInfo.h CodeGen: Update for LLVM API change in r228030 2015-02-03 21:25:34 +00:00
CGDecl.cpp Replace Sema's map of locally-scoped extern "C" declarations with a DeclContext 2015-03-07 00:04:49 +00:00
CGDeclCXX.cpp [OPENMP] Rename methods of OpenMPRuntime class. NFC. 2015-02-25 08:32:46 +00:00
CGException.cpp MS ABI: Implement support for throwing a C++ exception 2015-03-05 00:46:22 +00:00
CGExpr.cpp Reapply r231508 "CodeGen: Emit constant temporaries into read-only globals." 2015-03-07 13:37:13 +00:00
CGExprAgg.cpp Sema: Parenthesized bound destructor member expressions can be called 2015-02-25 17:36:15 +00:00
CGExprCXX.cpp Improvement on sized deallocation from r230160: 2015-02-25 23:48:43 +00:00
CGExprComplex.cpp Sema: Parenthesized bound destructor member expressions can be called 2015-02-25 17:36:15 +00:00
CGExprConstant.cpp CodeGen: Optimize emssion of zeroinitialzied arrays 2014-12-28 23:46:59 +00:00
CGExprScalar.cpp [UBSan] Split -fsanitize=shift into -fsanitize=shift-base and -fsanitize=shift-exponent. 2015-03-09 21:50:19 +00:00
CGLoopInfo.cpp CodeGen: Update LoopAttributes for LLVM API change 2015-01-19 21:30:48 +00:00
CGLoopInfo.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
CGObjC.cpp Prefer SmallVector::append/insert over push_back loops. Clang edition. 2015-02-17 16:48:30 +00:00
CGObjCGNU.cpp Replace size() calls on containers with empty() calls where appropriate. NFC 2015-01-23 15:36:10 +00:00
CGObjCMac.cpp Wrap to 80 columns. No behavior change. 2015-02-26 20:43:00 +00:00
CGObjCRuntime.cpp Update for llvm api change. 2014-06-04 18:51:46 +00:00
CGObjCRuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGOpenCLRuntime.cpp [C++11] Use 'nullptr'. CodeGen edition. 2014-05-21 05:09:00 +00:00
CGOpenCLRuntime.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGOpenMPRuntime.cpp [OPENMP] Initial codegen for 'omp task' directive. 2015-03-10 07:28:44 +00:00
CGOpenMPRuntime.h CGOpenMPRuntime.h: Fix an incorrect \param on emitTaskOutlinedFunction(). [-Wdocumentation] 2015-03-11 03:51:40 +00:00
CGRecordLayout.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
CGRecordLayoutBuilder.cpp 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
CGStmt.cpp [OPENMP] Improved code for generating debug info + generation of all OpenMP regions in termination scope 2015-03-10 05:15:26 +00:00
CGStmtOpenMP.cpp [OPENMP] Fix for ExprWithCleanups in 'omp atomic' constructs. 2015-03-11 04:48:56 +00:00
CGVTT.cpp Use a trivial comdat for C++ tables. 2015-01-15 23:18:01 +00:00
CGVTables.cpp CodeGenModule::EmitVTableBitSetEntries: Add check for identical bit set entries. 2015-02-24 01:12:53 +00:00
CGVTables.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CGValue.h Header guard canonicalization, clang part. 2014-08-13 16:25:19 +00:00
CMakeLists.txt Revert "Wrap clang module files in a Mach-O, ELF, or COFF container." 2015-02-25 02:44:04 +00:00
CodeGenABITypes.cpp Implement the __builtin_call_with_static_chain GNU extension. 2014-12-12 23:41:25 +00:00
CodeGenAction.cpp Add InlineAsmDiagnosticHandler for bitcode input 2015-02-12 02:06:55 +00:00
CodeGenFunction.cpp [OPENMP] Rename methods of OpenMPRuntime class. NFC. 2015-02-25 08:32:46 +00:00
CodeGenFunction.h MS ABI: Implement support for throwing a C++ exception 2015-03-05 00:46:22 +00:00
CodeGenModule.cpp [OPENMP] Rename methods of OpenMPRuntime class. NFC. 2015-02-25 08:32:46 +00:00
CodeGenModule.h Split catch IRgen into ItaniumCXXABI and MicrosoftCXXABI 2015-03-03 19:21:04 +00:00
CodeGenPGO.cpp InstrProf: Run clang-format to fix some strange indentation (NFC) 2015-02-23 19:27:00 +00:00
CodeGenPGO.h InstrProf: Use LLVM's -instrprof pass for profiling 2014-12-08 19:04:51 +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 Use nullptr to silence -Wsentinel when self-hosting on Windows 2014-12-01 22:02:27 +00:00
CodeGenTypes.h MS ABI: Implement copy-ctor closures, finish implementing throw 2015-03-11 18:36:39 +00:00
CoverageMappingGen.cpp InstrProf: Make sure counts in lambdas don't escape to the parent scope 2015-02-24 04:13:56 +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 Add comments for two CleanupKinds. 2015-02-25 03:58:36 +00:00
ItaniumCXXABI.cpp MS ABI: Implement support for throwing a C++ exception 2015-03-05 00:46:22 +00:00
Makefile
MicrosoftCXXABI.cpp MS ABI: Implement copy-ctor closures, finish implementing throw 2015-03-11 18:36:39 +00:00
ModuleBuilder.cpp Wrap to 80 columns. No behavior change. 2015-01-17 02:27:54 +00:00
README.txt
SanitizerMetadata.cpp IR: Update clang for Metadata/Value split in r223802 2014-12-09 18:39:32 +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 Under duress, move check for target support of __builtin_setjmp/ 2015-03-11 23:46:32 +00:00
TargetInfo.h Under duress, move check for target support of __builtin_setjmp/ 2015-03-11 23:46:32 +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!

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