--Owen
On Feb 6, 2008, at 4:33 PM, Bill Wendling wrote:
Author: void Date: Wed Feb 6 16:33:59 2008 New Revision: 46828 URL: http://llvm.org/viewvc/llvm-project?rev=46828&view=rev Log: [From mainline] http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080204/057964.htmlRegAllocaLocal still *requires* LiveVariables since it runs PHIElimination,followed by TwoAddress which requires LiveVariables. We cannot run LiveVariables on non-SSA code. http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080204/057979.html Fix a number of local register allocator issues: PR1609. Modified: llvm/branches/Apple/Zim/lib/CodeGen/RegAllocLocal.cpp Modified: llvm/branches/Apple/Zim/lib/CodeGen/RegAllocLocal.cpp URL: http://llvm.org/viewvc/llvm-project/llvm/branches/Apple/Zim/lib/CodeGen/RegAllocLocal.cpp?rev=46828&r1=46827&r2=46828&view=diff= = = = = = = = ======================================================================--- llvm/branches/Apple/Zim/lib/CodeGen/RegAllocLocal.cpp (original)+++ llvm/branches/Apple/Zim/lib/CodeGen/RegAllocLocal.cpp Wed Feb 6 16:33:59 2008@@ -14,11 +14,12 @@ #define DEBUG_TYPE "regalloc" #include "llvm/BasicBlock.h" -#include "llvm/CodeGen/Passes.h" +#include "llvm/CodeGen/LiveVariables.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineInstr.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/Passes.h" #include "llvm/CodeGen/RegAllocRegistry.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetMachine.h" @@ -28,6 +29,7 @@ #include "llvm/ADT/IndexedMap.h" #include "llvm/ADT/SmallVector.h" #include "llvm/ADT/Statistic.h" +#include "llvm/ADT/STLExtras.h" #include <algorithm> using namespace llvm; @@ -146,6 +148,7 @@ } virtual void getAnalysisUsage(AnalysisUsage &AU) const { + AU.addRequired<LiveVariables>(); AU.addRequiredID(PHIEliminationID); AU.addRequiredID(TwoAddressInstructionPassID); MachineFunctionPass::getAnalysisUsage(AU); @@ -294,16 +297,24 @@std::pair<MachineInstr*, unsigned> &LastUse = getVirtRegLastUse(VirtReg);if (LastUse.first) LastUse.first->getOperand(LastUse.second).setIsKill(); - } -- // Otherwise, there is a virtual register corresponding to this physical - // register. We only need to spill it into its stack slot if it has been- // modified. - if (isVirtRegModified(VirtReg)) { + } else {+ // Otherwise, there is a virtual register corresponding to this physical + // register. We only need to spill it into its stack slot if it has been+ // modified.const TargetRegisterClass *RC = MF- >getRegInfo().getRegClass(VirtReg);int FrameIndex = getStackSpaceFor(VirtReg, RC); DOUT << " to stack slot #" << FrameIndex; TII->storeRegToStackSlot(MBB, I, PhysReg, true, FrameIndex, RC); ++ // If the instruction reads the register that's spilled, (e.g. this can+ // happen if it is a move to a physical register), then the spill + // instruction is not a kill.+ if (I != MBB.end() && I->findRegisterUseOperandIdx(PhysReg) != -1) {+ MachineBasicBlock::iterator StoreMI = prior(I); + int Idx = StoreMI->findRegisterUseOperandIdx(PhysReg, true); + assert(Idx != -1 && "Unrecognized spill instruction!"); + StoreMI->getOperand(Idx).setIsKill(false); + } ++NumStores; // Update statistics } @@ -492,12 +503,6 @@ // If we can fold this spill into this instruction, do so now. SmallVector<unsigned, 2> Ops; Ops.push_back(OpNum);- if (MachineInstr* FMI = TII->foldMemoryOperand(MI, Ops, FrameIndex)) {- ++NumFolded; - // Update kill/dead flags. - FMI->copyKillDeadInfo(MI); - return MBB.insert(MBB.erase(MI), FMI); - }// It looks like we can't fold this virtual register load into this // instruction. Force some poor hapless value out of the register file to@@ -773,9 +778,8 @@ // Finally, if this is a noop copy instruction, zap it. unsigned SrcReg, DstReg; - if (TII.isMoveInstr(*MI, SrcReg, DstReg) && SrcReg == DstReg) { + if (TII.isMoveInstr(*MI, SrcReg, DstReg) && SrcReg == DstReg) MBB.erase(MI); - } } MachineBasicBlock::iterator MI = MBB.getFirstTerminator(); _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
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