diff options
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp b/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp index b1c0433641dd..a4b4bf2973d1 100644 --- a/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp +++ b/llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp @@ -35,6 +35,8 @@ STATISTIC(NumRemovedInPreEmit, "Number of instructions deleted in pre-emit peephole"); STATISTIC(NumberOfSelfCopies, "Number of self copy instructions eliminated"); +STATISTIC(NumFrameOffFoldInPreEmit, + "Number of folding frame offset by using r+r in pre-emit peephole"); static cl::opt<bool> RunPreEmitPeephole("ppc-late-peephole", cl::Hidden, cl::init(true), @@ -161,8 +163,19 @@ namespace { } bool runOnMachineFunction(MachineFunction &MF) override { - if (skipFunction(MF.getFunction()) || !RunPreEmitPeephole) + if (skipFunction(MF.getFunction()) || !RunPreEmitPeephole) { + // Remove UNENCODED_NOP even when this pass is disabled. + // This needs to be done unconditionally so we don't emit zeros + // in the instruction stream. + SmallVector<MachineInstr *, 4> InstrsToErase; + for (MachineBasicBlock &MBB : MF) + for (MachineInstr &MI : MBB) + if (MI.getOpcode() == PPC::UNENCODED_NOP) + InstrsToErase.push_back(&MI); + for (MachineInstr *MI : InstrsToErase) + MI->eraseFromParent(); return false; + } bool Changed = false; const PPCInstrInfo *TII = MF.getSubtarget<PPCSubtarget>().getInstrInfo(); const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo(); @@ -171,6 +184,10 @@ namespace { Changed |= removeRedundantLIs(MBB, TRI); for (MachineInstr &MI : MBB) { unsigned Opc = MI.getOpcode(); + if (Opc == PPC::UNENCODED_NOP) { + InstrsToErase.push_back(&MI); + continue; + } // Detect self copies - these can result from running AADB. if (PPCInstrInfo::isSameClassPhysRegCopy(Opc)) { const MCInstrDesc &MCID = TII->get(Opc); @@ -202,6 +219,12 @@ namespace { InstrsToErase.push_back(DefMIToErase); } } + if (TII->foldFrameOffset(MI)) { + Changed = true; + NumFrameOffFoldInPreEmit++; + LLVM_DEBUG(dbgs() << "Frame offset folding by using index form: "); + LLVM_DEBUG(MI.dump()); + } } // Eliminate conditional branch based on a constant CR bit by |