Evan Cheng 8f90b6eb2f The coalescer does not coalesce a virtual register to a physical register if any of the physical register's sub-register live intervals overlaps with the virtual register. This is overly conservative. It prevents a extract_subreg from being coalesced away: ... v1024 = EDI // not killed = = EDI One possible solution is for the coalescer to examine the sub-register live intervals in the same manner as the physical register. Another possibility is to examine defs and uses (when needed) of sub-registers. Both solutions are too expensive. For now, look for "short virtual intervals" and scan instructions to look for conflict instead. This is a small win on x86-64. e.g. It shaves 403.gcc by ~80 instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61847 91177308-0d34-0410-b5e6-96231b3b80d8		2009-01-07 02:08:57 +00:00
..
Alpha	Correct some thinkos in the expansion of ADD/SUB	2008-11-12 08:23:26 +00:00
ARM	Clean up some ARM GV asm printing out; minor fixes to match what gcc does.	2008-12-06 02:00:55 +00:00
CBackend	Fix PR2907 by digging through constant expressions to find FP constants that	2008-10-22 04:53:16 +00:00
CellSPU	CellSPU:	2009-01-06 03:36:14 +00:00
CPP	Put CPPBackend tests into their own directory and run them only if they're	2008-07-10 22:35:32 +00:00
Generic	Fix a bug in ComputeLinearIndex computation handling multi-level	2009-01-06 22:53:52 +00:00
IA64	sabre brings to my attention that the 'tr' suffix is also obsolete	2008-05-20 21:00:03 +00:00
Mips	Fix PR2667: add soft float support for sint_to_fp/uint_to_fp	2008-11-10 17:36:26 +00:00
PowerPC	rename a file to follow naming conventions.	2009-01-02 01:52:35 +00:00
SPARC	Add testcase for 'r' inline asm operand	2008-10-10 20:28:59 +00:00
X86	The coalescer does not coalesce a virtual register to a physical register if any of the physical register's sub-register live intervals overlaps with the virtual register. This is overly conservative. It prevents a extract_subreg from being coalesced away:	2009-01-07 02:08:57 +00:00
XCore	Add support for ISD::TRAP to the XCore backend	2008-12-03 10:59:16 +00:00