Jakob Stoklund Olesen 40d07bbebb Add CoalescerPair helper class. ... Given a copy instruction, CoalescerPair can determine which registers to coalesce in order to eliminate the copy. It deals with all the subreg fun to determine a tuple (DstReg, SrcReg, SubIdx) such that: - SrcReg is a virtual register that will disappear after coalescing. - DstReg is a virtual or physical register whose live range will be extended. - SubIdx is 0 when DstReg is a physical register. - SrcReg can be joined with DstReg:SubIdx. CoalescerPair::isCoalescable() determines if another copy instruction is compatible with the same tuple. This fixes some NEON miscompilations where shuffles are getting coalesced as if they were copies. The CoalescerPair class will replace a lot of the spaghetti logic in JoinCopy later. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105997 91177308-0d34-0410-b5e6-96231b3b80d8		2010-06-15 16:04:21 +00:00
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Alpha	Split big test into multiple directories to cater to	2010-04-07 20:43:35 +00:00
ARM	Generalize the pre-coalescing of extract_subregs feeding reg_sequences,	2010-06-15 05:56:31 +00:00
Blackfin	Start function numbering at 0.	2010-04-17 16:29:15 +00:00
CBackend
CellSPU	Fix SPU to cope with vector insertelement to an undef position.	2010-06-09 09:58:17 +00:00
CPP	fix PR5295 where the .ll parser didn't reject a function after a global	2009-10-25 23:22:50 +00:00
Generic	Implement expansion in type legalization for add/sub with overflow. The	2010-06-03 03:49:50 +00:00
MBlaze	Split big test into multiple directories to cater to	2010-04-07 20:43:35 +00:00
Mips	Start function numbering at 0.	2010-04-17 16:29:15 +00:00
MSP430	Insert ANY_EXTEND node instead of invalid truncate during DAG Combining (X & 1),	2010-05-01 12:52:34 +00:00
PIC16	Remove XFAIL for vg_leak as the leaks are fixed by 100601.	2010-04-07 07:06:48 +00:00
PowerPC	Fix some latency computation bugs: if the use is not a machine opcode do not just return zero.	2010-05-28 23:26:21 +00:00
SPARC	Split big test into multiple directories to cater to	2010-04-07 20:43:35 +00:00
SystemZ	SystemZ really does mean "has calls" and not just "adjusts stack." Go ahead and	2010-05-14 22:17:42 +00:00
Thumb	Enable a bunch more -regalloc=fast tests	2010-05-12 00:11:24 +00:00
Thumb2	Add CoalescerPair helper class.	2010-06-15 16:04:21 +00:00
X86	apparently lots of dupes.	2010-06-14 20:19:03 +00:00
XCore	Start function numbering at 0.	2010-04-17 16:29:15 +00:00