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Change MachineBasicBlock's vector of MachineInstr pointers into an

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ilist of MachineInstr objects. This allows constant time removal and
insertion of MachineInstr instances from anywhere in each
MachineBasicBlock. It also allows for constant time splicing of
MachineInstrs into or out of MachineBasicBlocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11340 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos
2004-02-12 02:27:10 +00:00
parent 918cdd420b
commit c0b9dc5be7
41 changed files with 380 additions and 408 deletions
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18
lib/Target/SparcV9/SparcV9PeepholeOpts.cpp
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@@ -31,14 +31,14 @@ DeleteInstruction(MachineBasicBlock& mvec,
// Check if this instruction is in a delay slot of its predecessor.
if (BBI != mvec.begin()) {
const TargetInstrInfo& mii = target.getInstrInfo();
MachineInstr* predMI = *(BBI-1);
MachineBasicBlock::iterator predMI = BBI; --predMI;
if (unsigned ndelay = mii.getNumDelaySlots(predMI->getOpcode())) {
// This instruction is in a delay slot of its predecessor, so
// replace it with a nop. By replacing in place, we save having
// to update the I-I maps.
//
assert(ndelay == 1 && "Not yet handling multiple-delay-slot targets");
(*BBI)->replace(mii.getNOPOpCode(), 0);
BBI->replace(mii.getNOPOpCode(), 0);
return;
}
}
@@ -99,7 +99,7 @@ inline bool
RemoveUselessCopies(MachineBasicBlock& mvec,
MachineBasicBlock::iterator& BBI,
const TargetMachine& target) {
if (IsUselessCopy(target, *BBI)) {
if (IsUselessCopy(target, BBI)) {
DeleteInstruction(mvec, BBI, target);
return true;
}
@@ -148,16 +148,8 @@ bool PeepholeOpts::runOnBasicBlock(BasicBlock &BB) {
assert(MBB && "MachineBasicBlock object not found for specified block!");
MachineBasicBlock &mvec = *MBB;
// Iterate over all machine instructions in the BB
// Use a reverse iterator to allow deletion of MI or any instruction after it.
// Insertions or deletions *before* MI are not safe.
//
for (MachineBasicBlock::reverse_iterator RI=mvec.rbegin(),
RE=mvec.rend(); RI != RE; ) {
MachineBasicBlock::iterator BBI = RI.base()-1; // save before incr
++RI; // pre-increment to delete MI or after it
visit(mvec, BBI);
}
for (MachineBasicBlock::iterator I = mvec.begin(), E = mvec.end(); I != E; )
visit(mvec, I++);
return true;
}