4 Commits

Author	SHA1	Message	Date
Jakob Stoklund Olesen	9b9861651f	Get allocation orders from RegisterClassInfo when possible. ... Only target-dependent hints require callbacks. The RCI allocation order has CSR aliases last according to their order of appearance in the getCalleeSavedRegs list. This can depend on the calling convention. This way, AllocationOrder::next doesn't have to check for reserved registers, and CSRs are always allocated last, even with weird calling conventions. llvm-svn: 132690	2011-06-06 21:02:04 +00:00
Jakob Stoklund Olesen	449aaba5b0	Switch AllocationOrder to using RegisterClassInfo instead of a BitVector ... of reserved registers. Use RegisterClassInfo in RABasic as well. This slightly changes som allocation orders because RegisterClassInfo puts CSR aliases last. llvm-svn: 132581	2011-06-03 20:34:53 +00:00
Jakob Stoklund Olesen	9d328484ce	Try harder to get the hint by preferring to evict hint interference. ... llvm-svn: 126463	2011-02-25 01:04:22 +00:00
Jakob Stoklund Olesen	e3924a3c85	Add an AllocationOrder class that can iterate over the allocatable physical ... registers for a given virtual register. Reserved registers are filtered from the allocation order, and any valid hint is returned as the first suggestion. For target dependent hints, a number of arcane target hooks are invoked. llvm-svn: 121497	2010-12-10 18:36:02 +00:00