Author: lattner
Date: Fri Jan 4 20:33:22 2008
New Revision: 45617
URL: http://llvm.org/viewvc/llvm-project?rev=45617&view=rev
Log:
don't sink anything with side effects, this makes lots of stuff work, but sinks
almost nothing.
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=45617&r1=45616&r2=45617&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineSink.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineSink.cpp Fri Jan 4 20:33:22 2008
@@ -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();
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