[llvm-commits] [llvm] r125552 - /llvm/trunk/lib/CodeGen/PeepholeOptimizer.cpp

[Evan Cheng]

Author: evancheng
Date: Mon Feb 14 23:00:24 2011
New Revision: 125552

URL: http://llvm.org/viewvc/llvm-project?rev=125552&view=rev
Log:
Fix thinko. Cmp can be the first instruction in a MBB.

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

Modified: llvm/trunk/lib/CodeGen/PeepholeOptimizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PeepholeOptimizer.cpp?rev=125552&r1=125551&r2=125552&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/PeepholeOptimizer.cpp (original)
+++ llvm/trunk/lib/CodeGen/PeepholeOptimizer.cpp Mon Feb 14 23:00:24 2011
@@ -331,7 +331,8 @@
     ImmDefRegs.clear();
     ImmDefMIs.clear();
 
-    MachineBasicBlock::iterator PMII = I->begin();
+    bool First = true;
+    MachineBasicBlock::iterator PMII;
     for (MachineBasicBlock::iterator
            MII = I->begin(), MIE = I->end(); MII != MIE; ) {
       MachineInstr *MI = &*MII;
@@ -348,7 +349,7 @@
         if (OptimizeCmpInstr(MI, MBB)) {
           // MI is deleted.
           Changed = true;
-          MII = llvm::next(PMII);
+          MII = First ? I->begin() : llvm::next(PMII);
           continue;
         }
       }
@@ -360,6 +361,8 @@
         if (SeenMoveImm)
           Changed |= FoldImmediate(MI, MBB, ImmDefRegs, ImmDefMIs);
       }
+
+      First = false;
       PMII = MII;
       ++MII;
     }