4 Commits

Author	SHA1	Message	Date
Jakob Stoklund Olesen	ec2e964fd6	Remove the local register allocator. ... Please use the fast allocator instead. llvm-svn: 106051	2010-06-15 21:58:33 +00:00
Jakob Stoklund Olesen	f1b3029a54	Mostly rewrite RegAllocFast. ... Sorry for the big change. The path leading up to this patch had some TableGen changes that I didn't want to commit before I knew they were useful. They weren't, and this version does not need them. The fast register allocator now does no liveness calculations. Instead it relies on kill flags provided by isel. (Currently those kill flags are also ignored due to isel bugs). The allocation algorithm is supposed to work with any subset of valid kill flags. More kill flags simply means fewer spills inserted. Registers are allocated from a working set that contains no aliases. That means most allocations can be done directly without expensive alias checks. When the working set runs out of registers we do the full alias check to find new free registers. llvm-svn: 103488	2010-05-11 18:54:45 +00:00
Nick Lewycky	45f530db39	Revert r103133 and add testcase from PR7066. ... llvm-svn: 103233	2010-05-07 01:45:38 +00:00
Jakob Stoklund Olesen	1b6f698e85	Fix PR6520. An earlyclobber physreg must not be allocated to anything else. ... llvm-svn: 103133	2010-05-05 23:07:41 +00:00