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4 Commits

Author SHA1 Message Date
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
32f1783ca1 Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic. 
These functions not longer assert when passed 0, but simply return false instead.

No functional change intended.

llvm-svn: 123155
 2011-01-10 02:58:51 +00:00
Jakob Stoklund Olesen
5ab6552845 Use AllocationOrder in RegAllocGreedy, fix a bug in the hint calculation. 
llvm-svn: 121584
 2010-12-10 22:21:05 +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