[llvm-commits] [llvm] r98224 - /llvm/trunk/lib/CodeGen/MachineCSE.cpp

[Dale Johannesen]

Author: johannes
Date: Wed Mar 10 20:10:24 2010
New Revision: 98224

URL: http://llvm.org/viewvc/llvm-project?rev=98224&view=rev
Log:
Fix debug_value handling.


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

Modified: llvm/trunk/lib/CodeGen/MachineCSE.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineCSE.cpp?rev=98224&r1=98223&r2=98224&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineCSE.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineCSE.cpp Wed Mar 10 20:10:24 2010
@@ -122,8 +122,12 @@
       // Reached end of block, register is obviously dead.
       return true;
 
-    if (I->isDebugValue())
+    if (I->isDebugValue()) {
+      // These must not count against the limit.
+      ++LookAheadLeft;
+      ++I;
       continue;
+    }
     bool SeenDef = false;
     for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
       const MachineOperand &MO = I->getOperand(i);
@@ -188,7 +192,7 @@
 
 bool MachineCSE::isCSECandidate(MachineInstr *MI) {
   if (MI->isLabel() || MI->isPHI() || MI->isImplicitDef() ||
-      MI->isKill() || MI->isInlineAsm())
+      MI->isKill() || MI->isInlineAsm() || MI->isDebugValue())
     return false;
 
   // Ignore copies.