Bob Wilson cc80df92c1 Overhaul the TwoAddressInstructionPass to simplify the logic, especially ... for the complicated case where one register is tied to multiple destinations. This avoids the extra scan of instruction operands that was introduced by my recent change. I also pulled some code out into a separate TryInstructionTransform method, added more comments, and renamed some variables. Besides all those changes, this takes care of a FIXME in the code regarding an assumption about there being a single tied use of a register when converting to a 3-address form. I'm not aware of cases where that assumption is violated, but the code now only attempts to transform an instruction, either by commuting its operands or by converting to a 3-address form, for the simple case where there is a single pair of tied operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80945 91177308-0d34-0410-b5e6-96231b3b80d8		2009-09-03 20:58:42 +00:00
..
Analysis	Smallvectorize switchExitBlocks.	2009-09-03 20:36:13 +00:00
Archive	Prune #includes from llvm/Linker.h and llvm/System/Path.h,	2009-08-23 22:45:37 +00:00
AsmParser	Refactor common code from ParseAssemblyString and ParseAssemblyFile,	2009-09-02 17:18:19 +00:00
Bitcode	back out my recent commit (r80858), it seems to break self-hosting buildbot's stage 2 configure	2009-09-03 02:02:59 +00:00
CodeGen	Overhaul the TwoAddressInstructionPass to simplify the logic, especially	2009-09-03 20:58:42 +00:00
CompilerDriver	convert LoopInfo.h and GraphWriter.h to use raw_ostream	2009-08-23 07:19:13 +00:00
Debugger	Prune #includes from llvm/Linker.h and llvm/System/Path.h,	2009-08-23 22:45:37 +00:00
ExecutionEngine	Fix PR4845: r77946 completely broke x86_64 Darwin (or any situation where the	2009-09-02 00:19:03 +00:00
Linker	There is not any need to copy metadata while merging modules.	2009-09-03 20:35:57 +00:00
MC	fix MCSymbol printing to exactly match the normal mangler rules so	2009-09-03 05:57:47 +00:00
Support	Show derived host triple in --version.	2009-09-02 23:52:38 +00:00
System	Improve llvm::getHostTriple for some cases where the LLVM_HOSTTRIPLE is not	2009-09-03 01:10:13 +00:00
Target	Recognize more opportunities to use SSE min and max instructions,	2009-09-03 20:34:31 +00:00
Transforms	Add a verifyAnalysis to LoopInfo, LoopSimplify, and LCSSA form that verify	2009-09-03 16:31:42 +00:00
VMCore	Use WeakVH to hold dead mdnodes. Check use_empty() before deleting a node.	2009-09-03 17:03:47 +00:00
Makefile	LLVMC doesn't need ENABLE_PIC to build now.	2009-07-04 03:54:54 +00:00