misched: obvious iterator update fixes for bottom-up.
llvm-svn: 153160
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 9f67d6d..57ae6dc 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -369,8 +369,12 @@
void ScheduleDAGMI::moveInstruction(MachineInstr *MI,
MachineBasicBlock::iterator InsertPos) {
+ // Fix RegionBegin if the first instruction moves down.
+ if (&*RegionBegin == MI)
+ RegionBegin = llvm::next(RegionBegin);
BB->splice(InsertPos, BB, MI);
LIS->handleMove(MI);
+ // Fix RegionBegin if another instruction moves above the first instruction.
if (RegionBegin == InsertPos)
RegionBegin = MI;
}
@@ -440,6 +444,8 @@
if (&*llvm::prior(CurrentBottom) == MI)
--CurrentBottom;
else {
+ if (&*CurrentTop == MI)
+ CurrentTop = llvm::next(CurrentTop);
moveInstruction(MI, CurrentBottom);
CurrentBottom = MI;
}