Add getTPred() and getFPred() functions.
They identify the PHI predecessors in both diamonds and triangles.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161689 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/EarlyIfConversion.cpp b/lib/CodeGen/EarlyIfConversion.cpp
index b7ad8a4..3b7f879 100644
--- a/lib/CodeGen/EarlyIfConversion.cpp
+++ b/lib/CodeGen/EarlyIfConversion.cpp
@@ -96,6 +96,12 @@
/// equal to Tail.
bool isTriangle() const { return TBB == Tail || FBB == Tail; }
+ /// Returns the Tail predecessor for the True side.
+ MachineBasicBlock *getTPred() const { return TBB == Tail ? Head : TBB; }
+
+ /// Returns the Tail predecessor for the False side.
+ MachineBasicBlock *getFPred() const { return FBB == Tail ? Head : FBB; }
+
/// Information about each phi in the Tail block.
struct PHIInfo {
MachineInstr *PHI;
@@ -391,8 +397,8 @@
// Any phis in the tail block must be convertible to selects.
PHIs.clear();
- MachineBasicBlock *TPred = TBB == Tail ? Head : TBB;
- MachineBasicBlock *FPred = FBB == Tail ? Head : FBB;
+ MachineBasicBlock *TPred = getTPred();
+ MachineBasicBlock *FPred = getFPred();
for (MachineBasicBlock::iterator I = Tail->begin(), E = Tail->end();
I != E && I->isPHI(); ++I) {
PHIs.push_back(&*I);