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When writing kernel, save the branches til the end. They are still put in the "right place" in the schedule, but sometimes when folding to make a kernel instructions are added between branches. This is wrong. To avoid this, we handle branches special.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18450 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1542,11 +1542,21 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
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std::map<Value*, Value*> finalPHIValue;
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std::map<Value*, Value*> kernelValue;
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//Branches are a special case
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std::vector<MachineInstr*> branches;
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//Create TmpInstructions for the final phis
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for(MSSchedule::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
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DEBUG(std::cerr << "Stage: " << I->second << " Inst: " << *(I->first->getInst()) << "\n";);
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if(I->first->isBranch()) {
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//Clone instruction
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const MachineInstr *inst = I->first->getInst();
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MachineInstr *instClone = inst->clone();
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branches.push_back(instClone);
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}
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//Clone instruction
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const MachineInstr *inst = I->first->getInst();
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MachineInstr *instClone = inst->clone();
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@ -1556,11 +1566,6 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
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DEBUG(std::cerr << "Cloned Inst: " << *instClone << "\n");
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if(I->first->isBranch()) {
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//Add kernel noop
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BuildMI(machineBB, V9::NOP, 0);
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}
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//Loop over Machine Operands
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for(unsigned i=0; i < inst->getNumOperands(); ++i) {
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//get machine operand
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@ -1623,6 +1628,13 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
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}
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//Add branches
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for(std::vector<MachineInstr*>::iterator I = branches.begin(), E = branches.end(); I != E; ++I) {
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machineBB->push_back(*I);
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BuildMI(machineBB, V9::NOP, 0);
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}
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DEBUG(std::cerr << "KERNEL before PHIs\n");
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DEBUG(machineBB->print(std::cerr));
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