llvm-project/clang/lib/CodeGen
Akira Hatanaka 8ab86cb344 Coerce byval aggregate arguments to integers whose size matches the integer
register size of the target architecture.
 

llvm-svn: 156650
2012-05-11 21:56:58 +00:00
..
ABIInfo.h Add field PaddingType to ABIArgInfo which specifies the type of padding that 2012-01-07 00:25:33 +00:00
BackendUtil.cpp Use enum to set debug info size generated by Clang 2012-04-27 07:24:20 +00:00
CGBlocks.cpp This patch adds a new Clang compiler flag "-gline-tables-only". 2012-05-04 07:39:27 +00:00
CGBlocks.h Whenever explicitly activating or deactivating a cleanup, we 2011-11-10 10:43:54 +00:00
CGBuilder.h Make CGBuilderTy a typedef again; its functionality has been rolled back 2010-07-06 18:43:48 +00:00
CGBuiltin.cpp Hexagon V5 intrinsics support in clang. 2012-05-11 19:39:08 +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 the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGCXXABI.cpp Abstract the emission of global destructors into ABI-specific code 2012-05-01 06:13:13 +00:00
CGCXXABI.h Abstract the emission of global destructors into ABI-specific code 2012-05-01 06:13:13 +00:00
CGCall.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGCall.h Whether an argument is required (in contrast with being an 2012-02-17 03:33:10 +00:00
CGClass.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGCleanup.cpp llvm::SwitchInst 2012-03-11 06:09:37 +00:00
CGCleanup.h Simplify EH control flow by observing that EH scopes form a simple 2011-08-11 02:22:43 +00:00
CGDebugInfo.cpp The address of a vla is actually complex and requires a dereference. 2012-05-08 18:56:47 +00:00
CGDebugInfo.h Enable debug info for objective c implementations that may not have 2012-04-11 05:56:05 +00:00
CGDecl.cpp This patch adds a new Clang compiler flag "-gline-tables-only". 2012-05-04 07:39:27 +00:00
CGDeclCXX.cpp Abstract the emission of global destructors into ABI-specific code 2012-05-01 06:13:13 +00:00
CGException.cpp Revert r153613 as it's causing large compile-time regressions on the nightly testers. 2012-03-29 17:37:10 +00:00
CGExpr.cpp update calls to objectsize intrinsic to match LLVM r156473 2012-05-09 15:53:34 +00:00
CGExprAgg.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGExprCXX.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGExprComplex.cpp Unify naming of LangOptions variable/get function across the Clang stack (Lex to AST). 2012-03-11 07:00:24 +00:00
CGExprConstant.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGExprScalar.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGObjC.cpp objective-c IRGen. Fixes a getter synthesis bug 2012-04-26 21:33:14 +00:00
CGObjCGNU.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGObjCMac.cpp Remove the ref/value inconsistency in filter_decl_iterator. 2012-04-30 02:36:29 +00:00
CGObjCRuntime.cpp Unify naming of LangOptions variable/get function across the Clang stack (Lex to AST). 2012-03-11 07:00:24 +00:00
CGObjCRuntime.h Add clang support for new Objective-C literal syntax for NSDictionary, NSArray, 2012-03-06 20:05:56 +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 Unify naming of LangOptions variable/get function across the Clang stack (Lex to AST). 2012-03-11 07:00:24 +00:00
CGRecordLayout.h clean up forward declarations of raw_ostream to use the new LLVM.h 2011-07-23 10:35:09 +00:00
CGRecordLayoutBuilder.cpp Add support for laying out vtordisps according to our current 2012-05-01 08:55:32 +00:00
CGStmt.cpp Spacing. 2012-05-01 19:53:37 +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 Fix a use-after-free in thunk emission. EmitThunk may call RAUW on Init, invalidating the pointer. 2012-03-20 20:18:13 +00:00
CGVTables.h Move VTable builder to AST 2011-09-26 01:57:12 +00:00
CGValue.h Revert r153613 as it's causing large compile-time regressions on the nightly testers. 2012-03-29 17:37:10 +00:00
CMakeLists.txt Add missing dependency to unbreak the CMake build 2012-02-01 19:53:01 +00:00
CodeGenAction.cpp Escape % in diagnostic message when compiling LLVM IR. 2012-03-16 22:31:42 +00:00
CodeGenFunction.cpp add -fbounds-checking option. 2012-05-08 22:10:46 +00:00
CodeGenFunction.h add -fbounds-checking option. 2012-05-08 22:10:46 +00:00
CodeGenModule.cpp This patch adds a new Clang compiler flag "-gline-tables-only". 2012-05-04 07:39:27 +00:00
CodeGenModule.h Refactor the C++ ABI code a little bit to take advantage of 2012-05-01 05:23:51 +00:00
CodeGenTBAA.cpp enable TBAA when -fthread-sanitizer is given, even with -O0 or -relaxed-aliasing 2012-04-24 06:57:01 +00:00
CodeGenTBAA.h enable TBAA when -fthread-sanitizer is given, even with -O0 or -relaxed-aliasing 2012-04-24 06:57:01 +00:00
CodeGenTypes.cpp Fix some i1/i8 confusion within _Atomic(bool) in IR generation, both 2012-04-12 20:42:30 +00:00
CodeGenTypes.h Whether an argument is required (in contrast with being an 2012-02-17 03:33:10 +00:00
ItaniumCXXABI.cpp Abstract the emission of global destructors into ABI-specific code 2012-05-01 06:13:13 +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 Abstract the emission of global destructors into ABI-specific code 2012-05-01 06:13:13 +00:00
ModuleBuilder.cpp Unify naming of LangOptions variable/get function across the Clang stack (Lex to AST). 2012-03-11 07:00:24 +00:00
README.txt
TargetInfo.cpp Coerce byval aggregate arguments to integers whose size matches the integer 2012-05-11 21:56:58 +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!

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