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4 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 0cde8eb9e2 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 b8bf3c0f8b 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 9918b33451 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 0c67e01e5f 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