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Machine LICM will check that operands are defined outside of the loop. Also
check that register isn't 0 before going further. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45498 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -144,37 +144,6 @@ bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const {
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return true;
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}
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/// isDefinedInEntryBlock - Goes through the entry block to see if the given
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/// virtual register is indeed defined in the entry block.
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///
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bool X86InstrInfo::isDefinedInEntryBlock(const MachineBasicBlock &Entry,
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unsigned VReg) const {
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assert(MRegisterInfo::isVirtualRegister(VReg) &&
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"Map only holds virtual registers!");
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MachineInstrMap.grow(VReg);
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if (MachineInstrMap[VReg]) return true;
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MachineBasicBlock::const_iterator I = Entry.begin(), E = Entry.end();
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for (; I != E; ++I) {
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const MachineInstr &MI = *I;
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unsigned NumOps = MI.getNumOperands();
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for (unsigned i = 0; i < NumOps; ++i) {
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const MachineOperand &MO = MI.getOperand(i);
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if(MO.isRegister() && MO.isDef() &&
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MRegisterInfo::isVirtualRegister(MO.getReg()) &&
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MO.getReg() == VReg) {
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MachineInstrMap[VReg] = &MI;
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return true;
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}
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}
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}
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return false;
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}
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/// isReallySideEffectFree - If the M_MAY_HAVE_SIDE_EFFECTS flag is set, this
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/// method is called to determine if the specific instance of this instruction
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/// has side effects. This is useful in cases of instructions, like loads, which
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@ -189,8 +158,7 @@ bool X86InstrInfo::isReallySideEffectFree(MachineInstr *MI) const {
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// Loads from global addresses which aren't redefined in the function are
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// side effect free.
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if (MRegisterInfo::isVirtualRegister(Reg) &&
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isDefinedInEntryBlock(MI->getParent()->getParent()->front(), Reg) &&
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if (Reg != 0 && MRegisterInfo::isVirtualRegister(Reg) &&
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MI->getOperand(2).isImmediate() &&
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MI->getOperand(3).isRegister() &&
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MI->getOperand(4).isGlobalAddress() &&
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@ -225,13 +225,6 @@ namespace X86II {
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class X86InstrInfo : public TargetInstrInfoImpl {
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X86TargetMachine &TM;
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const X86RegisterInfo RI;
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mutable IndexedMap<const MachineInstr*, VirtReg2IndexFunctor> MachineInstrMap;
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/// isDefinedInEntryBlock - Goes through the entry block to see if the given
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/// virtual register is indeed defined in the entry block.
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///
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bool isDefinedInEntryBlock(const MachineBasicBlock &Entry,
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unsigned VReg) const;
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public:
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X86InstrInfo(X86TargetMachine &tm);
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