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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.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18450 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tanya Lattner 2004-12-03 05:25:22 +00:00
parent 223d4c4b3a
commit f3fa55f979
1 changed files with 17 additions and 5 deletions
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22
lib/Target/SparcV9/ModuloScheduling/ModuloScheduling.cpp
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@ -1542,11 +1542,21 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
std::map<Value*, Value*> finalPHIValue;
std::map<Value*, Value*> kernelValue;
//Branches are a special case
std::vector<MachineInstr*> branches;
//Create TmpInstructions for the final phis
for(MSSchedule::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
DEBUG(std::cerr << "Stage: " << I->second << " Inst: " << *(I->first->getInst()) << "\n";);
if(I->first->isBranch()) {
//Clone instruction
const MachineInstr *inst = I->first->getInst();
MachineInstr *instClone = inst->clone();
branches.push_back(instClone);
}
//Clone instruction
const MachineInstr *inst = I->first->getInst();
MachineInstr *instClone = inst->clone();
@ -1556,11 +1566,6 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
DEBUG(std::cerr << "Cloned Inst: " << *instClone << "\n");
if(I->first->isBranch()) {
//Add kernel noop
BuildMI(machineBB, V9::NOP, 0);
}
//Loop over Machine Operands
for(unsigned i=0; i < inst->getNumOperands(); ++i) {
//get machine operand
@ -1623,6 +1628,13 @@ void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *ma
}
//Add branches
for(std::vector<MachineInstr*>::iterator I = branches.begin(), E = branches.end(); I != E; ++I) {
machineBB->push_back(*I);
BuildMI(machineBB, V9::NOP, 0);
}
DEBUG(std::cerr << "KERNEL before PHIs\n");
DEBUG(machineBB->print(std::cerr));