[LLVMdev] Greedy Register Allocation in LLVM 3.0

[Jakob Stoklund Olesen]

On Sep 26, 2011, at 2:12 AM, Carlo Alberto Ferraris wrote:

> Just a quick question: is greedy still a local allocator (i.e. only takes into consideration the current bb) or a global one (takes into consideration the whole function)?

RegAllocGreedy, RegAllocBasic, RegAllocLinearScan and RegAllocPBQP are global.

RegAllocFast is local.  It is only used for -O0.  In the future, it may get primitive support for the kind of global live ranges that clang -O0 can produce.

/jakob