[LLVMdev] Greedy Register Allocation in LLVM 3.0

Jakob Stoklund Olesen stoklund at 2pi.dk
Mon Sep 26 11:27:36 PDT 2011

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.


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