llvm-project/clang/lib/CodeGen
Quentin Colombet ee3e0fb632 Revert commit r166946
llvm-svn: 166957
2012-10-29 18:28:57 +00:00
..
ABIInfo.h Add padding inreg registers to cause llvm to skip ecx when needed with 2012-10-24 01:59:00 +00:00
BackendUtil.cpp Clang now attempts to create a TargetMachine whenever a triple is given. 2012-10-24 03:52:31 +00:00
CGBlocks.cpp objective-C arc/mrr: Patch for the new block variable layout meta-data. 2012-10-27 21:10:38 +00:00
CGBlocks.h Remove BLOCK_BYREF_LAYOUT_BYREF flags from list of 2012-10-26 20:33:59 +00:00
CGBuilder.h Update Clang to reflect the new home of IRBuilder.h as of r159421. 2012-06-29 12:39:08 +00:00
CGBuiltin.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
CGCUDANV.cpp CUDA: IR generation support for device stubs 2011-10-06 18:51:56 +00:00
CGCUDARuntime.cpp CUDA: IR generation support for kernel call expressions 2011-10-06 18:29:37 +00:00
CGCUDARuntime.h CUDA: IR generation support for device stubs 2011-10-06 18:51:56 +00:00
CGCXX.cpp Remove get(V)BaseClassOffsetInBits, the CharUnit functions should be used instead. 2012-07-04 18:45:14 +00:00
CGCXXABI.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
CGCXXABI.h PR13684: Emit vtable entries for deleted functions as __cxa_deleted_function. 2012-10-16 22:56:05 +00:00
CGCall.cpp Oz optimization level sets ForceSizeOpt attribute for each function 2012-10-26 00:29:48 +00:00
CGCall.h Whether an argument is required (in contrast with being an 2012-02-17 03:33:10 +00:00
CGClass.cpp Switch CodeGenOptions over to a .def file, like we do with LangOptions. 2012-10-23 20:05:01 +00:00
CGCleanup.cpp Make sure we don't emit IR for unused EH cleanups. PR13359. 2012-08-02 00:10:24 +00:00
CGCleanup.h Documentation cleanup: 2012-06-15 22:10:14 +00:00
CGDebugInfo.cpp Initialize debug info for special cases of functions that lack declarations and are generated by Clang (global initializers/destructors, thunks) . Fixes PR13942. 2012-10-25 10:18:50 +00:00
CGDebugInfo.h Reapply: 2012-08-20 23:32:17 +00:00
CGDecl.cpp Switch CodeGenOptions over to a .def file, like we do with LangOptions. 2012-10-23 20:05:01 +00:00
CGDeclCXX.cpp Initialize debug info for special cases of functions that lack declarations and are generated by Clang (global initializers/destructors, thunks) . Fixes PR13942. 2012-10-25 10:18:50 +00:00
CGException.cpp Add the ObjFW runtime. Patch by Jonathan Schleifer! 2012-07-12 02:07:58 +00:00
CGExpr.cpp Move two helper functions to AST so that sema can use them. 2012-10-27 01:03:43 +00:00
CGExprAgg.cpp -fcatch-undefined-behavior: emit calls to the runtime library whenever one of the checks fails. 2012-10-09 19:52:38 +00:00
CGExprCXX.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
CGExprComplex.cpp Change the representation of builtin functions in the AST 2012-08-31 00:14:07 +00:00
CGExprConstant.cpp Make -mms-bitfields behave consistently. 2012-10-12 23:29:20 +00:00
CGExprScalar.cpp Switch CodeGenOptions over to a .def file, like we do with LangOptions. 2012-10-23 20:05:01 +00:00
CGObjC.cpp Don't crash synthesizing an ObjC property with an empty struct type. <rdar://problem/12547611>. 2012-10-26 22:38:05 +00:00
CGObjCGNU.cpp objective-C arc/mrr: Patch for the new block variable layout meta-data. 2012-10-27 21:10:38 +00:00
CGObjCMac.cpp objective-C arc/mrr: Patch for the new block variable layout meta-data. 2012-10-27 21:10:38 +00:00
CGObjCRuntime.cpp Distinguish more carefully between free functions and C++ instance methods 2012-07-07 06:41:13 +00:00
CGObjCRuntime.h objective-C arc/mrr: Patch for the new block variable layout meta-data. 2012-10-27 21:10:38 +00:00
CGOpenCLRuntime.cpp OpenCL: introduce support for function scope __local variables 2011-09-19 21:14:35 +00:00
CGOpenCLRuntime.h OpenCL: introduce support for function scope __local variables 2011-09-19 21:14:35 +00:00
CGRTTI.cpp Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164766 2012-09-27 10:16:10 +00:00
CGRecordLayout.h Use LLVM_DELETED_FUNCTION in place of 'DO NOT IMPLEMENT' comments. 2012-09-15 20:20:27 +00:00
CGRecordLayoutBuilder.cpp Make -mms-bitfields behave consistently. 2012-10-12 23:29:20 +00:00
CGStmt.cpp Handle '*' and '#' asm constraint modifiers. 2012-10-29 12:20:54 +00:00
CGVTT.cpp simplify a bunch of code to use the well-known LLVM IR types computed by CodeGenModule. 2012-02-07 00:39:47 +00:00
CGVTables.cpp Initialize debug info for special cases of functions that lack declarations and are generated by Clang (global initializers/destructors, thunks) . Fixes PR13942. 2012-10-25 10:18:50 +00:00
CGVTables.h Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164766 2012-09-27 10:16:10 +00:00
CGValue.h Fix for PR#13606: http://llvm.org/bugs/show_bug.cgi?id=13606 2012-08-15 18:40:30 +00:00
CMakeLists.txt clang/lib: [CMake] Update tblgen'd dependencies. 2012-07-27 06:18:33 +00:00
CodeGenAction.cpp Escape % in diagnostic message when compiling LLVM IR. 2012-03-16 22:31:42 +00:00
CodeGenFunction.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
CodeGenFunction.h -fcatch-undefined-behavior checking for appropriate vptr value: Clang CodeGen side. 2012-10-25 02:14:12 +00:00
CodeGenModule.cpp Revert commit r166946 2012-10-29 18:28:57 +00:00
CodeGenModule.h Add codegen support for __uuidof(). 2012-10-11 10:13:44 +00:00
CodeGenTBAA.cpp Add basic support for adding !tbaa.struct metadata on llvm.memcpy calls for 2012-09-28 21:58:29 +00:00
CodeGenTBAA.h Add basic support for adding !tbaa.struct metadata on llvm.memcpy calls for 2012-09-28 21:58:29 +00:00
CodeGenTypes.cpp Move TargetData to DataLayout. 2012-10-08 16:25:52 +00:00
CodeGenTypes.h Move TargetData to DataLayout. 2012-10-08 16:25:52 +00:00
ItaniumCXXABI.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
Makefile BUILD_ARCHIVE is the default for libraries, no need to set it. 2010-07-18 00:14:47 +00:00
MicrosoftCXXABI.cpp Cleanup some clang code to use new type functions instead of using cast<>. 2012-10-25 15:39:14 +00:00
ModuleBuilder.cpp Move TargetData to DataLayout. 2012-10-08 16:25:52 +00:00
README.txt
TargetInfo.cpp This patch addresses a 64-bit PowerPC ELF ABI compatibility issue with 2012-10-26 19:59:03 +00:00
TargetInfo.h Whether an argument is required (in contrast with being an 2012-02-17 03:33:10 +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!

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