Chris Lattner d7ef6d6774 Significantly simplify this code and make it more aggressive. Instead of having ... a special case hack for X86, make the hack more general: if an incoming argument register is not used in any block other than the entry block, don't copy it to a vreg. This helps us compile code like this: %struct.foo = type { int, int, [0 x ubyte] } int %test(%struct.foo* %X) { %tmp1 = getelementptr %struct.foo* %X, int 0, uint 2, int 100 %tmp = load ubyte* %tmp1 ; <ubyte> [#uses=1] %tmp2 = cast ubyte %tmp to int ; <int> [#uses=1] ret int %tmp2 } to: _test: lbz r3, 108(r3) blr instead of: _test: lbz r2, 108(r3) or r3, r2, r2 blr The (dead) copy emitted to copy r3 into a vreg for extra-block uses was increasing the live range of r3 past the load, preventing the coallescing. This implements CodeGen/PowerPC/reg-coallesce-simple.ll llvm-svn: 24115		2005-10-30 19:42:35 +00:00
..
SelectionDAG	Significantly simplify this code and make it more aggressive. Instead of having	2005-10-30 19:42:35 +00:00
AsmPrinter.cpp	Culling out use of unions for converting FP to bits and vice versa.	2005-08-17 19:34:49 +00:00
BranchFolding.cpp	Remove trailing whitespace	2005-04-21 22:36:52 +00:00
ELFWriter.cpp	Fix VC++ constant truncation warning.	2005-08-19 16:19:21 +00:00
IntrinsicLowering.cpp	When a function takes a variable number of pointer arguments, with a zero	2005-10-23 04:37:20 +00:00
LiveInterval.cpp	Fix LiveInterval::getOverlapingRanges to take things in the right order	2005-10-21 06:41:30 +00:00
LiveIntervalAnalysis.cpp	Fix some spello's pointed out by Gabor Greif	2005-10-26 18:41:41 +00:00
LiveVariables.cpp	Implement LiveVariables.h change	2005-08-24 00:09:33 +00:00
MachineBasicBlock.cpp	Remove trailing whitespace	2005-04-21 22:36:52 +00:00
MachineCodeEmitter.cpp	new is not a valid default anywhere, so make this pure virtual	2005-07-28 18:13:59 +00:00
MachineFunction.cpp	Added graphviz/gv support for MF.	2005-10-12 12:09:05 +00:00
MachineInstr.cpp	Remove trailing whitespace	2005-04-21 22:36:52 +00:00
Makefile
Passes.cpp	Alkis agrees that that iterative scan allocator isn't going to be worked on	2005-10-24 04:14:30 +00:00
PHIElimination.cpp	clean up this code a bit, no functionality change	2005-10-03 07:22:07 +00:00
PhysRegTracker.h
PrologEpilogInserter.cpp	now that we have a reg class to spill with, get this info from the regclass	2005-09-30 17:19:22 +00:00
RegAllocLinearScan.cpp	Expose the LiveInterval interfaces as public headers.	2005-09-21 04:19:09 +00:00
RegAllocLocal.cpp	Change this code ot pass register classes into the stack slot spiller/reloader	2005-09-30 01:29:00 +00:00
RegAllocSimple.cpp	Change this code ot pass register classes into the stack slot spiller/reloader	2005-09-30 01:29:00 +00:00
TwoAddressInstructionPass.cpp	Fix some spello's pointed out by Gabor Greif	2005-10-26 18:41:41 +00:00
UnreachableBlockElim.cpp	Remove trailing whitespace	2005-04-21 22:36:52 +00:00
ValueTypes.cpp	add printer support for flag operands	2005-08-25 17:59:23 +00:00
VirtRegMap.cpp	Fix the LLC regressions on X86 last night. In particular, when undoing	2005-10-06 17:19:06 +00:00
VirtRegMap.h	Remove trailing whitespace	2005-04-21 22:36:52 +00:00