1 files changed, 0 insertions, 37 deletions
diff --git a/llvm/lib/CodeGen/RegisterClassInfo.cpp b/llvm/lib/CodeGen/RegisterClassInfo.cpp
index 9312bc03bc52..976d41a54da5 100644
--- a/llvm/lib/CodeGen/RegisterClassInfo.cpp
+++ b/llvm/lib/CodeGen/RegisterClassInfo.cpp
@@ -195,40 +195,3 @@ void RegisterClassInfo::compute(const TargetRegisterClass *RC) const {
   // RCI is now up-to-date.
   RCI.Tag = Tag;
 }
-
-/// This is not accurate because two overlapping register sets may have some
-/// nonoverlapping reserved registers. However, computing the allocation order
-/// for all register classes would be too expensive.
-unsigned RegisterClassInfo::computePSetLimit(unsigned Idx) const {
-  const TargetRegisterClass *RC = nullptr;
-  unsigned NumRCUnits = 0;
-  for (const TargetRegisterClass *C : TRI->regclasses()) {
-    const int *PSetID = TRI->getRegClassPressureSets(C);
-    for (; *PSetID != -1; ++PSetID) {
-      if ((unsigned)*PSetID == Idx)
-        break;
-    }
-    if (*PSetID == -1)
-      continue;
-
-    // Found a register class that counts against this pressure set.
-    // For efficiency, only compute the set order for the largest set.
-    unsigned NUnits = TRI->getRegClassWeight(C).WeightLimit;
-    if (!RC || NUnits > NumRCUnits) {
-      RC = C;
-      NumRCUnits = NUnits;
-    }
-  }
-  assert(RC && "Failed to find register class");
-  compute(RC);
-  unsigned NAllocatableRegs = getNumAllocatableRegs(RC);
-  unsigned RegPressureSetLimit = TRI->getRegPressureSetLimit(*MF, Idx);
-  // If all the regs are reserved, return raw RegPressureSetLimit.
-  // One example is VRSAVERC in PowerPC.
-  // Avoid returning zero, getRegPressureSetLimit(Idx) assumes computePSetLimit
-  // return non-zero value.
-  if (NAllocatableRegs == 0)
-    return RegPressureSetLimit;
-  unsigned NReserved = RC->getNumRegs() - NAllocatableRegs;
-  return RegPressureSetLimit - TRI->getRegClassWeight(RC).RegWeight * NReserved;
-}