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- Slight change to finalizeBundle() interface. LastMI is not exclusive (pointing

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to instruction right after the last instruction in the bundle.
- Add a finalizeBundle() variant that doesn't specify LastMI. Instead, the code
  will find the last instruction in the bundle by following the 'InsideBundle'
  marker. This is useful in case bundles are formed early (i.e. during MI
  scheduling) but finalized later (i.e. after register allocator has finished
  rewriting virtual registers with physical registers).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148444 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2012-01-19 00:46:06 +00:00
parent 22de16dc75
commit bca15f9c80
3 changed files with 28 additions and 5 deletions
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9
include/llvm/CodeGen/MachineInstrBundle.h
View File

@ -20,7 +20,7 @@
namespace llvm {
/// finalizeBundle - Finalize a machine instruction bundle which includes
/// a sequence of instructions starting from FirstMI to LastMI (inclusive).
/// a sequence of instructions starting from FirstMI to LastMI (exclusive).
/// This routine adds a BUNDLE instruction to represent the bundle, it adds
/// IsInternalRead markers to MachineOperands which are defined inside the
/// bundle, and it copies externally visible defs and uses to the BUNDLE
@ -29,6 +29,13 @@ void finalizeBundle(MachineBasicBlock &MBB,
MachineBasicBlock::instr_iterator FirstMI,
MachineBasicBlock::instr_iterator LastMI);
/// finalizeBundle - Same functionality as the previous finalizeBundle except
/// the last instruction in the bundle is not provided as an input. This is
/// used in cases where bundles are pre-determined by marking instructions
/// with 'InsideBundle' marker.
void finalizeBundle(MachineBasicBlock &MBB,
MachineBasicBlock::instr_iterator FirstMI);
} // End llvm namespace
#endif

21
lib/CodeGen/MachineInstrBundle.cpp
View File

@ -72,7 +72,7 @@ bool UnpackMachineBundles::runOnMachineFunction(MachineFunction &MF) {
}
/// finalizeBundle - Finalize a machine instruction bundle which includes
/// a sequence of instructions starting from FirstMI to LastMI (inclusive).
/// a sequence of instructions starting from FirstMI to LastMI (exclusive).
/// This routine adds a BUNDLE instruction to represent the bundle, it adds
/// IsInternalRead markers to MachineOperands which are defined inside the
/// bundle, and it copies externally visible defs and uses to the BUNDLE
@ -80,6 +80,8 @@ bool UnpackMachineBundles::runOnMachineFunction(MachineFunction &MF) {
void llvm::finalizeBundle(MachineBasicBlock &MBB,
MachineBasicBlock::instr_iterator FirstMI,
MachineBasicBlock::instr_iterator LastMI) {
assert(FirstMI != LastMI && "Empty bundle?");
const TargetMachine &TM = MBB.getParent()->getTarget();
const TargetInstrInfo *TII = TM.getInstrInfo();
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
@ -96,7 +98,7 @@ void llvm::finalizeBundle(MachineBasicBlock &MBB,
SmallSet<unsigned, 8> KilledUseSet;
SmallSet<unsigned, 8> UndefUseSet;
SmallVector<MachineOperand*, 4> Defs;
do {
for (; FirstMI != LastMI; ++FirstMI) {
for (unsigned i = 0, e = FirstMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = FirstMI->getOperand(i);
if (!MO.isReg())
@ -157,7 +159,7 @@ void llvm::finalizeBundle(MachineBasicBlock &MBB,
FirstMI->setIsInsideBundle();
Defs.clear();
} while (FirstMI++ != LastMI);
}
SmallSet<unsigned, 8> Added;
for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
@ -178,3 +180,16 @@ void llvm::finalizeBundle(MachineBasicBlock &MBB,
getImplRegState(true));
}
}
/// finalizeBundle - Same functionality as the previous finalizeBundle except
/// the last instruction in the bundle is not provided as an input. This is
/// used in cases where bundles are pre-determined by marking instructions
/// with 'InsideBundle' marker.
void llvm::finalizeBundle(MachineBasicBlock &MBB,
MachineBasicBlock::instr_iterator FirstMI) {
MachineBasicBlock::instr_iterator E = MBB.instr_end();
MachineBasicBlock::instr_iterator LastMI = llvm::next(FirstMI);
while (LastMI != E && LastMI->isInsideBundle())
++LastMI;
finalizeBundle(MBB, FirstMI, LastMI);
}

3
lib/Target/ARM/Thumb2ITBlockPass.cpp
View File

@ -239,7 +239,8 @@ bool Thumb2ITBlockPass::InsertITInstructions(MachineBasicBlock &MBB) {
LastITMI->findRegisterUseOperand(ARM::ITSTATE)->setIsKill();
// Finalize the bundle.
finalizeBundle(MBB, InsertPos.getInstrIterator(), LastITMI);
MachineBasicBlock::instr_iterator LI = LastITMI;
finalizeBundle(MBB, InsertPos.getInstrIterator(), llvm::next(LI));
Modified = true;
++NumITs;