Chris Lattner cfa0f2edd3 Make the 2-address instruction lowering pass smarter in two ways: ... 1. If we are two-addressing a commutable instruction and the LHS is not the last use of the variable, see if the instruction is the last use of the RHS. If so, commute the instruction, allowing us to avoid a register-register copy in many cases for common instructions like ADD, OR, AND, etc on X86. 2. If #1 doesn't hold, and if this is an instruction that also existing in 3-address form, promote the instruction to a 3-address instruction to avoid the register-register copy. We can do this for several common instructions in X86, including ADDrr, INC, DEC, etc. This patch implements test/Regression/CodeGen/X86/commute-two-addr.ll, overlap-add.ll, and overlap-shift.ll when I check in the X86 support for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19245 91177308-0d34-0410-b5e6-96231b3b80d8		2005-01-02 02:34:12 +00:00
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SelectionDAG	Change Library Names Not To Conflict With Others When Installed	2004-10-27 23:18:45 +00:00
AsmPrinter.cpp	Fix SingleSource/UnitTests/2004-11-28-GlobalBoolLayout.c, and hopefully	2004-11-28 17:56:47 +00:00
BranchFolding.cpp	Changes For Bug 352	2004-09-01 22:55:40 +00:00
IntrinsicLowering.cpp	Fix #includes of i*.h => Instructions.h as per PR403.	2004-07-29 17:30:56 +00:00
LiveInterval.cpp	Prevent accessing past the end of the intervals vector, this fixes	2004-12-04 01:22:09 +00:00
LiveInterval.h	Fix typeo	2004-11-18 04:31:10 +00:00
LiveIntervalAnalysis.cpp	For PR387:\	2004-12-07 04:03:45 +00:00
LiveIntervalAnalysis.h	For PR387:\	2004-12-07 04:03:45 +00:00
LiveVariables.cpp	Do not use variable sized arrays in C++, they are non-portable. Patch	2004-10-25 18:44:14 +00:00
MachineBasicBlock.cpp	Move method bodies that depend on <algorithm> from MBB.h to MBB.cpp	2004-10-26 15:43:42 +00:00
MachineCodeEmitter.cpp	Fix the FIXME, nuke the JIT specific forceCompilationOf method.	2004-11-22 21:54:35 +00:00
MachineFunction.cpp	Indent to 2 spaces and cleanup excess whitespace.	2004-09-05 18:41:35 +00:00
MachineInstr.cpp	Allow machine operands to represent global variables with offsets. This is	2004-10-15 04:38:41 +00:00
Makefile	Change Library Names Not To Conflict With Others When Installed	2004-10-27 23:18:45 +00:00
Passes.cpp	Changes For Bug 352	2004-09-01 22:55:40 +00:00
PHIElimination.cpp	Changes For Bug 352	2004-09-01 22:55:40 +00:00
PhysRegTracker.h	Improved PhysRegTracker interface. RegAlloc lazily allocates the register tracker using a std::auto_ptr	2004-02-23 06:10:13 +00:00
PrologEpilogInserter.cpp	Put this change back in after testing from Reid proved its innocence. getSpillSize now returns value in bits	2004-08-29 22:00:24 +00:00
RegAllocIterativeScan.cpp	Move virtual method call out of loop	2004-12-15 07:04:32 +00:00
RegAllocLinearScan.cpp	Move virtual method call out of loop	2004-12-15 07:04:32 +00:00
RegAllocLocal.cpp	Clean up the MachineBasicBlock.h file, percolating #includes into this file.	2004-10-26 15:35:58 +00:00
RegAllocSimple.cpp	Changes For Bug 352	2004-09-01 22:55:40 +00:00
TwoAddressInstructionPass.cpp	Make the 2-address instruction lowering pass smarter in two ways:	2005-01-02 02:34:12 +00:00
UnreachableBlockElim.cpp	Changes For Bug 352	2004-09-01 22:55:40 +00:00
VirtRegMap.cpp	Clean up the MachineBasicBlock.h file, percolating #includes into this file.	2004-10-26 15:35:58 +00:00
VirtRegMap.h	When a virtual register is folded into an instruction, keep track of whether	2004-10-01 23:15:36 +00:00