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Fixed rewriting of branches -- they now work forward and backward.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2003-05-31 06:26:48 +00:00
parent dcbe712841
commit f86d635e20
1 changed files with 9 additions and 4 deletions
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13
lib/ExecutionEngine/JIT/SparcEmitter.cpp
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@ -30,7 +30,7 @@ namespace {
std::vector<std::pair<BasicBlock*,
std::pair<unsigned*,MachineInstr*> > > BBRefs;
std::map<BasicBlock*, unsigned> BBLocations;
std::map<BasicBlock*, long> BBLocations;
std::vector<void*> ConstantPoolAddresses;
public:
SparcEmitter(VM &vm) : TheVM(vm) {}
@ -94,15 +94,20 @@ void SparcEmitter::finishFunction(MachineFunction &F) {
ConstantPoolAddresses.clear();
// Re-write branches to BasicBlocks for the entire function
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
unsigned Location = BBLocations[BBRefs[i].first];
long Location = BBLocations[BBRefs[i].first];
unsigned *Ref = BBRefs[i].second.first;
MachineInstr *MI = BBRefs[i].second.second;
std::cerr << "attempting to resolve BB: " << i << "\n";
for (unsigned i=0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &op = MI->getOperand(i);
if (op.isPCRelativeDisp()) {
// the instruction's branch target is made such that it branches to
// PC + (br target * 4), so undo that arithmetic here:
// Location is the target of the branch
// Ref is the location of the instruction, and hence the PC
unsigned branchTarget = (Location - (long)Ref) >> 2;
MI->SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed,
Location);
branchTarget);
std::cerr << "Rewrote BB ref: ";
unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
*Ref = fixedInstr;
@ -135,7 +140,7 @@ void SparcEmitter::emitConstantPool(MachineConstantPool *MCP) {
void SparcEmitter::startBasicBlock(MachineBasicBlock &BB) {
BBLocations[BB.getBasicBlock()] = (unsigned)(intptr_t)CurByte;
BBLocations[BB.getBasicBlock()] = (long)(intptr_t)CurByte;
}