llvm-mirror

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History

Evan Cheng 13037fbfb4 Move rematerialization out of beta. llvm-svn: 35419		2007-03-28 08:26:40 +00:00
..
SelectionDAG	Scale 1 is always ok.	2007-03-28 01:55:52 +00:00
AsmPrinter.cpp	Small eye-candy: use asciz directive everywhere, where possible.	2007-03-06 19:25:02 +00:00
BranchFolding.cpp	maintain LiveIn when splitting blocks (register scavenging needs it)	2007-03-20 21:35:06 +00:00
DwarfWriter.cpp	Cleanup: make SetCounter an instance variable	2007-03-07 08:25:02 +00:00
ELFWriter.cpp	Generalize TargetData strings, to support more interesting forms of data.	2007-02-14 05:52:17 +00:00
ELFWriter.h	Moved from include/llvm/CodeGen to lib/CodeGen.	2007-02-08 01:30:50 +00:00
IntrinsicLowering.cpp	Lower eh filter intrinsic.	2007-03-01 20:24:30 +00:00
LiveInterval.cpp	Added an automatic cast to "std::ostream*" etc. from OStream. We then can	2006-12-17 05:15:13 +00:00
LiveIntervalAnalysis.cpp	Move rematerialization out of beta.	2007-03-28 08:26:40 +00:00
LiveVariables.cpp	Track the BB's where each virtual register is used.	2007-03-17 09:29:54 +00:00
LLVMTargetMachine.cpp	Now LoopStrengthReduce is a LoopPass.	2007-03-06 21:14:09 +00:00
MachineBasicBlock.cpp	Print preds / succs BB numbers.	2007-03-09 08:29:08 +00:00
MachineFunction.cpp	Generalize TargetData strings, to support more interesting forms of data.	2007-02-14 05:52:17 +00:00
MachineInstr.cpp	Change findRegisterUseOperand() to return operand index instead.	2007-03-26 22:37:45 +00:00
MachineModuleInfo.cpp	Collect eh filter info.	2007-03-01 20:25:32 +00:00
MachinePassRegistry.cpp
MachOWriter.cpp	Remove unneeded header file.	2007-03-04 04:41:04 +00:00
MachOWriter.h	More Mach-O writer improvements.	2007-02-28 07:40:50 +00:00
Makefile	this will work better	2006-11-03 19:15:55 +00:00
Passes.cpp	* empty log message *	2006-11-16 20:11:33 +00:00
PHIElimination.cpp	Keep UsedBlocks info accurate.	2007-03-18 09:02:31 +00:00
PhysRegTracker.h
PrologEpilogInserter.cpp	If target decides to create an emergency spill slot, make sure it's closest to SP or frame pointer.	2007-03-06 10:02:38 +00:00
README.txt	Potential spiller improvement.	2007-03-20 22:22:38 +00:00
RegAllocLinearScan.cpp	First cut trivial re-materialization support.	2007-03-20 08:13:50 +00:00
RegAllocLocal.cpp	Use BitVector instead of vector<bool> which can be extremely slow.	2007-02-15 05:59:24 +00:00
RegAllocSimple.cpp	Eliminate static ctors from Statistics	2006-12-19 22:41:21 +00:00
RegisterScavenging.cpp	Fix reversed logic in getRegsUsed. Rename RegStates to RegsAvailable to	2007-03-26 22:23:54 +00:00
TwoAddressInstructionPass.cpp	Keep UsedBlocks info accurate.	2007-03-18 09:02:31 +00:00
UnreachableBlockElim.cpp
VirtRegMap.cpp	Don't call getOperandConstraint() if operand index is greater than	2007-03-27 00:48:28 +00:00
VirtRegMap.h	First cut trivial re-materialization support.	2007-03-20 08:13:50 +00:00

README.txt

Common register allocation / spilling problem:

	mul lr, r4, lr
	str lr, [sp, #+52]
	ldr lr, [r1, #+32]
	sxth r3, r3
	ldr r4, [sp, #+52]
	mla r4, r3, lr, r4

can be:

	mul lr, r4, lr
        mov r4, lr
	str lr, [sp, #+52]
	ldr lr, [r1, #+32]
	sxth r3, r3
	mla r4, r3, lr, r4

and then "merge" mul and mov:

	mul r4, r4, lr
	str lr, [sp, #+52]
	ldr lr, [r1, #+32]
	sxth r3, r3
	mla r4, r3, lr, r4

It also increase the likelyhood the store may become dead.