llvm-project

History

Anders Carlsson 59689ed764 Use Expr::Evaluate for case statements. Fixes PR2525 llvm-svn: 59881		2008-11-22 21:04:56 +00:00
..
CGBuilder.h	Disable generation of basic block names in NDEBUG mode.	2008-11-12 00:01:12 +00:00
CGBuiltin.cpp	rename Expr::tryEvaluate to Expr::Evaluate.	2008-11-16 21:24:15 +00:00
CGCXX.cpp	Normalize many BasicBlock names.	2008-11-13 01:38:36 +00:00
CGCall.cpp	Fix silly bug spotted by Daniel Dunbar	2008-11-15 06:35:36 +00:00
CGCall.h	Large mechanical patch.	2008-09-25 21:02:23 +00:00
CGDebugInfo.cpp	Introduction the DeclarationName class, as a single, general method of	2008-11-17 14:58:09 +00:00
CGDebugInfo.h	reimplement debug info generation in terms of DebugInfo.h instead of	2008-11-10 06:08:34 +00:00
CGDecl.cpp	Introduction the DeclarationName class, as a single, general method of	2008-11-17 14:58:09 +00:00
CGExpr.cpp	Fields of ivars of struct types are considered ivars	2008-11-21 18:14:01 +00:00
CGExprAgg.cpp	New AST node to access "implicit" setter/getter using property dor syntax.	2008-11-22 18:39:36 +00:00
CGExprComplex.cpp	Normalize many BasicBlock names.	2008-11-13 01:38:36 +00:00
CGExprConstant.cpp	Use tryEvaluate for constant exprs.	2008-11-22 02:34:39 +00:00
CGExprScalar.cpp	Add spec ref to comment.	2008-11-19 11:54:05 +00:00
CGObjC.cpp	New AST node to access "implicit" setter/getter using property dor syntax.	2008-11-22 18:39:36 +00:00
CGObjCGNU.cpp	Consolidated @try and @synchronize into a single	2008-11-21 00:49:24 +00:00
CGObjCMac.cpp	Fixed bugzilla bug# 3095 related to code gen. for @synchronized.	2008-11-21 19:21:53 +00:00
CGObjCRuntime.h	Consolidated @try and @synchronize into a single	2008-11-21 00:49:24 +00:00
CGStmt.cpp	Use Expr::Evaluate for case statements. Fixes PR2525	2008-11-22 21:04:56 +00:00
CGValue.h	Fields of ivars of struct types are considered ivars	2008-11-21 18:14:01 +00:00
CMakeLists.txt	CMake: Builds and installs clang binary and libs (no docs yet). It	2008-10-26 00:56:18 +00:00
CodeGenFunction.cpp	Introduction the DeclarationName class, as a single, general method of	2008-11-17 14:58:09 +00:00
CodeGenFunction.h	New AST node to access "implicit" setter/getter using property dor syntax.	2008-11-22 18:39:36 +00:00
CodeGenModule.cpp	reapply the (corrected) patch to use the new llvm intrinsics for memcpy/memmove etc.	2008-11-21 16:43:15 +00:00
CodeGenModule.h	Add option argument to GetAddrOfConstantString to use for name of	2008-10-17 21:56:50 +00:00
CodeGenTypes.cpp	Lift out ABIInfo abstract base class.	2008-10-13 17:02:26 +00:00
CodeGenTypes.h	Lift out ABIInfo abstract base class.	2008-10-13 17:02:26 +00:00
Makefile	Make a major restructuring of the clang tree: introduce a top-level	2008-03-15 23:59:48 +00:00
ModuleBuilder.cpp	Add GetModule accessor to ModuleBuilder	2008-10-21 19:55:09 +00:00
README.txt	Fix redundant load of bit-fields on assignment (to get the updated	2008-11-19 09:36:46 +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.

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