From d9e5c764bfea339fc5082bf17e558db959fd6d28 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Thu, 5 Jan 2012 00:26:49 +0000 Subject: Freeze reserved registers before starting register allocation. The register allocators don't currently support adding reserved registers while they are running. Extend the MRI API to keep track of the set of reserved registers when register allocation started. Target hooks like hasFP() and needsStackRealignment() can look at this set to avoid reserving more registers during register allocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147577 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/RegAllocBasic.cpp | 1 + 1 file changed, 1 insertion(+) (limited to 'lib/CodeGen/RegAllocBasic.cpp') diff --git a/lib/CodeGen/RegAllocBasic.cpp b/lib/CodeGen/RegAllocBasic.cpp index 5496d69fd3..8019cf227b 100644 --- a/lib/CodeGen/RegAllocBasic.cpp +++ b/lib/CodeGen/RegAllocBasic.cpp @@ -233,6 +233,7 @@ void RegAllocBase::init(VirtRegMap &vrm, LiveIntervals &lis) { MRI = &vrm.getRegInfo(); VRM = &vrm; LIS = &lis; + MRI->freezeReservedRegs(vrm.getMachineFunction()); RegClassInfo.runOnMachineFunction(vrm.getMachineFunction()); const unsigned NumRegs = TRI->getNumRegs(); -- cgit v1.2.3-70-g09d2