From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Thu, 16 Jul 2009 14:00:10 +0000 (+0000)
Subject: Implement InsertBranch() hook
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=64d52d4a5d761678a8ad88199ee8a2c5f77f6d22;p=oota-llvm.git

Implement InsertBranch() hook

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75966 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 0348e1e5ca8..90e77ffb18d 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -239,9 +239,32 @@ unsigned
 SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                               MachineBasicBlock *FBB,
                             const SmallVectorImpl<MachineOperand> &Cond) const {
-  assert(0 && "Implement branches!");
+  // FIXME this should probably have a DebugLoc operand
+  DebugLoc dl = DebugLoc::getUnknownLoc();
+  // Shouldn't be a fall through.
+  assert(TBB && "InsertBranch must not be told to insert a fallthrough");
+  assert((Cond.size() == 1 || Cond.size() == 0) &&
+         "SystemZ branch conditions have one component!");
+
+  if (Cond.empty()) {
+    // Unconditional branch?
+    assert(!FBB && "Unconditional branch with multiple successors!");
+    BuildMI(&MBB, dl, get(SystemZ::JMP)).addMBB(TBB);
+    return 1;
+  }
+
+  // Conditional branch.
+  unsigned Count = 0;
+  SystemZCC::CondCodes CC = (SystemZCC::CondCodes)Cond[0].getImm();
+  BuildMI(&MBB, dl, getBrCond(CC)).addMBB(TBB);
+  ++Count;
 
-  return 0;
+  if (FBB) {
+    // Two-way Conditional branch. Insert the second branch.
+    BuildMI(&MBB, dl, get(SystemZ::JMP)).addMBB(FBB);
+    ++Count;
+  }
+  return Count;
 }
 
 const TargetInstrDesc&