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add another target hook for branch folding.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31262 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -318,6 +318,14 @@ public:
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assert(0 && "Target didn't implement TargetInstrInfo::InsertBranch!");
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}
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/// BlockHasNoFallThrough - Return true if the specified block does not
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/// fall-through into its successor block. This is primarily used when a
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/// branch is unanalyzable. It is useful for things like unconditional
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/// indirect branches (jump tables).
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virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
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return false;
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}
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/// ReverseBranchCondition - Reverses the branch condition of the specified
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/// condition list, returning false on success and true if it cannot be
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/// reversed.
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@ -420,6 +420,18 @@ void X86InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
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BuildMI(&MBB, X86::JMP, 1).addMBB(FBB);
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}
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bool X86InstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
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if (MBB.empty()) return false;
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switch (MBB.back().getOpcode()) {
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case X86::JMP: // Uncond branch.
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case X86::JMP32r: // Indirect branch.
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case X86::JMP32m: // Indirect branch through mem.
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return true;
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default: return false;
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}
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}
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bool X86InstrInfo::
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ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
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assert(Cond.size() == 1 && "Invalid X86 branch condition!");
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@ -267,6 +267,7 @@ public:
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virtual void InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
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MachineBasicBlock *FBB,
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const std::vector<MachineOperand> &Cond) const;
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virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const;
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virtual bool ReverseBranchCondition(std::vector<MachineOperand> &Cond) const;
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const TargetRegisterClass *getPointerRegClass() const;
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