4 Commits

Author	SHA1	Message	Date
Jakob Stoklund Olesen	4931bbc671	Be more aggressive about following hints. ... RAGreedy::tryAssign will now evict interference from the preferred register even when another register is free. To support this, add the EvictionCost struct that counts how many hints are broken by an eviction. We don't want to break one hint just to satisfy another. Rename canEvict to shouldEvict, and add the first bit of eviction policy that doesn't depend on spill weights: Always make room in the preferred register as long as the evictees can be split and aren't already assigned to their preferred register. Also make the CSR avoidance more accurate. When looking for a cheaper register it is OK to use a new volatile register. Only CSR aliases that have never been used before should be avoided. llvm-svn: 134735	2011-07-08 20:46:18 +00:00
Jakob Stoklund Olesen	2348f3133f	Make room for register allocation to improve. ... llvm-svn: 132213	2011-05-27 20:15:06 +00:00
Dan Gohman	dd550305e6	Give this test an explicit register allocator, so that it can work even if ... the default register allocator is changed. llvm-svn: 130883	2011-05-04 23:14:02 +00:00
Dan Gohman	6136e94897	Add an unfolded offset field to LSR's Formula record. This is used to ... model constants which can be added to base registers via add-immediate instructions which don't require an additional register to materialize the immediate. llvm-svn: 130743	2011-05-03 00:46:49 +00:00