don't sink anything with side effects, this makes lots of stuff work, but sinks almost nothing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45617 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp
index dff60f6..31aeea5 100644
--- a/lib/CodeGen/MachineSink.cpp
+++ b/lib/CodeGen/MachineSink.cpp
@@ -130,6 +130,10 @@
/// SinkInstruction - Determine whether it is safe to sink the specified machine
/// instruction out of its current block into a successor.
bool MachineSinking::SinkInstruction(MachineInstr *MI) {
+ // Don't sink things with side-effects we don't understand.
+ if (TII->hasUnmodelledSideEffects(MI))
+ return false;
+
// Loop over all the operands of the specified instruction. If there is
// anything we can't handle, bail out.
MachineBasicBlock *ParentBlock = MI->getParent();