[llvm-commits] [llvm] r170063 - /llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h
Jakob Stoklund Olesen
stoklund at 2pi.dk
Wed Dec 12 16:59:36 PST 2012
Author: stoklund
Date: Wed Dec 12 18:59:36 2012
New Revision: 170063
URL: http://llvm.org/viewvc/llvm-project?rev=170063&view=rev
Log:
Express prepend and append in terms of a more generic insert().
Also add an MIBundleBuilder constructor that takes an existing bundle.
Together these functions make it possible to add instructions to
existing bundles.
Modified:
llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h
Modified: llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h?rev=170063&r1=170062&r2=170063&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h (original)
+++ llvm/trunk/include/llvm/CodeGen/MachineInstrBuilder.h Wed Dec 12 18:59:36 2012
@@ -363,6 +363,18 @@
}
}
+ /// Create an MIBundleBuilder representing an existing instruction or bundle
+ /// that has MI as its head.
+ explicit MIBundleBuilder(MachineInstr *MI)
+ : MBB(*MI->getParent()), Begin(MI) {
+ MachineBasicBlock::iterator I = MI;
+ ++I;
+ End = I.getInstrIterator();
+ }
+
+ /// Return a reference to the basic block containing this bundle.
+ MachineBasicBlock &getMBB() const { return MBB; }
+
/// Return true if no instructions have been inserted in this bundle yet.
/// Empty bundles aren't representable in a MachineBasicBlock.
bool empty() const { return Begin == End; }
@@ -373,25 +385,38 @@
/// Return an iterator beyond the last bundled instruction.
MachineBasicBlock::instr_iterator end() const { return End; }
+ /// Insert MI into this bundle before I which must point to an instruction in
+ /// the bundle, or end().
+ MIBundleBuilder &insert(MachineBasicBlock::instr_iterator I,
+ MachineInstr *MI) {
+ MBB.insert(I, MI);
+ if (I == Begin) {
+ if (!empty())
+ MI->bundleWithSucc();
+ Begin = MI;
+ return *this;
+ }
+ if (I == End) {
+ MI->bundleWithPred();
+ return *this;
+ }
+ // MI was inserted in the middle of the bundle, so its neighbors' flags are
+ // already fine. Update MI's bundle flags manually.
+ MI->setFlag(MachineInstr::BundledPred);
+ MI->setFlag(MachineInstr::BundledSucc);
+ return *this;
+ }
+
/// Insert MI into MBB by prepending it to the instructions in the bundle.
/// MI will become the first instruction in the bundle.
MIBundleBuilder &prepend(MachineInstr *MI) {
- MBB.insert(Begin, MI);
- if (!empty())
- MI->bundleWithSucc();
- Begin = MI;
- return *this;
+ return insert(begin(), MI);
}
/// Insert MI into MBB by appending it to the instructions in the bundle.
/// MI will become the last instruction in the bundle.
MIBundleBuilder &append(MachineInstr *MI) {
- MBB.insert(End, MI);
- if (empty())
- Begin = MI;
- else
- MI->bundleWithPred();
- return *this;
+ return insert(end(), MI);
}
};
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