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author | Evan Cheng <evan.cheng@apple.com> | 2010-04-29 18:51:00 +0000 |
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committer | Evan Cheng <evan.cheng@apple.com> | 2010-04-29 18:51:00 +0000 |
commit | bd6cb4ba1f743f840da844b44aa0ec92e56777ee (patch) | |
tree | 037613b9986dfe21a4ead27546727b8dcfc99dcd | |
parent | a83ce98d5f5860809ce339968656a383098221f6 (diff) | |
download | external_llvm-bd6cb4ba1f743f840da844b44aa0ec92e56777ee.zip external_llvm-bd6cb4ba1f743f840da844b44aa0ec92e56777ee.tar.gz external_llvm-bd6cb4ba1f743f840da844b44aa0ec92e56777ee.tar.bz2 |
Remove DBG_VALUE which reference dead stack slots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102654 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/CodeGen/VirtRegRewriter.cpp | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/lib/CodeGen/VirtRegRewriter.cpp b/lib/CodeGen/VirtRegRewriter.cpp index ac00194..7f0412c 100644 --- a/lib/CodeGen/VirtRegRewriter.cpp +++ b/lib/CodeGen/VirtRegRewriter.cpp @@ -1066,6 +1066,7 @@ class LocalRewriter : public VirtRegRewriter { VirtRegMap *VRM; BitVector AllocatableRegs; DenseMap<MachineInstr*, unsigned> DistanceMap; + DenseMap<int, SmallVector<MachineInstr*,4> > Slot2DbgValues; MachineBasicBlock *MBB; // Basic block currently being processed. @@ -1190,12 +1191,24 @@ bool LocalRewriter::runOnMachineFunction(MachineFunction &MF, VirtRegMap &vrm, // Mark unused spill slots. MachineFrameInfo *MFI = MF.getFrameInfo(); int SS = VRM->getLowSpillSlot(); - if (SS != VirtRegMap::NO_STACK_SLOT) - for (int e = VRM->getHighSpillSlot(); SS <= e; ++SS) + if (SS != VirtRegMap::NO_STACK_SLOT) { + for (int e = VRM->getHighSpillSlot(); SS <= e; ++SS) { + SmallVector<MachineInstr*, 4> &DbgValues = Slot2DbgValues[SS]; if (!VRM->isSpillSlotUsed(SS)) { MFI->RemoveStackObject(SS); + for (unsigned j = 0, ee = DbgValues.size(); j != ee; ++j) { + MachineInstr *DVMI = DbgValues[j]; + MachineBasicBlock *DVMBB = DVMI->getParent(); + DEBUG(dbgs() << "Removing debug info referencing FI#" << SS << '\n'); + VRM->RemoveMachineInstrFromMaps(DVMI); + DVMBB->erase(DVMI); + } ++NumDSS; } + DbgValues.clear(); + } + } + Slot2DbgValues.clear(); return true; } @@ -1905,6 +1918,10 @@ LocalRewriter::RewriteMBB(LiveIntervals *LIs, bool BackTracked = false; MachineInstr &MI = *MII; + // Remember DbgValue's which reference stack slots. + if (MI.isDebugValue() && MI.getOperand(0).isFI()) + Slot2DbgValues[MI.getOperand(0).getIndex()].push_back(&MI); + /// ReusedOperands - Keep track of operand reuse in case we need to undo /// reuse. ReuseInfo ReusedOperands(MI, TRI); |