[llvm-commits] [llvm] r45841 - /llvm/trunk/lib/CodeGen/MachineSink.cpp

[Chris Lattner]

Author: lattner
Date: Thu Jan 10 16:35:15 2008
New Revision: 45841

URL: http://llvm.org/viewvc/llvm-project?rev=45841&view=rev
Log:
Clamp down on sinking of lots of instructions.

Modified:
    llvm/trunk/lib/CodeGen/MachineSink.cpp

Modified: llvm/trunk/lib/CodeGen/MachineSink.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineSink.cpp?rev=45841&r1=45840&r2=45841&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/MachineSink.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineSink.cpp Thu Jan 10 16:35:15 2008
@@ -130,6 +130,15 @@
 /// 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) {
+  const TargetInstrDesc &TID = MI->getDesc();
+  
+  // Ignore stuff that we obviously can't sink.
+  if (TID.mayStore() || TID.isCall() || TID.isReturn() || TID.isBranch())
+    return false;
+
+  if (TID.mayLoad())
+    return false;
+  
   // Don't sink things with side-effects we don't understand.
   if (TII->hasUnmodelledSideEffects(MI))
     return false;