[llvm-commits] [llvm] r107778 - in /llvm/trunk: include/llvm/CodeGen/MachineBasicBlock.h lib/CodeGen/MachineBasicBlock.cpp

[Dan Gohman]

Author: djg
Date: Wed Jul  7 09:33:51 2010
New Revision: 107778

URL: http://llvm.org/viewvc/llvm-project?rev=107778&view=rev
Log:
Add a getFirstNonPHI utility function.

Modified:
    llvm/trunk/include/llvm/CodeGen/MachineBasicBlock.h
    llvm/trunk/lib/CodeGen/MachineBasicBlock.cpp

Modified: llvm/trunk/include/llvm/CodeGen/MachineBasicBlock.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/MachineBasicBlock.h?rev=107778&r1=107777&r2=107778&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/MachineBasicBlock.h (original)
+++ llvm/trunk/include/llvm/CodeGen/MachineBasicBlock.h Wed Jul  7 09:33:51 2010
@@ -282,6 +282,13 @@
   /// branch to do so (e.g., a table jump).  True is a conservative answer.
   bool canFallThrough();
 
+  /// Returns a pointer to the first instructon in this block that is not a 
+  /// PHINode instruction. When adding instruction to the beginning of the
+  /// basic block, they should be added before the returned value, not before
+  /// the first instruction, which might be PHI.
+  /// Returns end() is there's no non-PHI instruction.
+  iterator getFirstNonPHI();
+
   /// getFirstTerminator - returns an iterator to the first terminator
   /// instruction of this basic block. If a terminator does not exist,
   /// it returns end()

Modified: llvm/trunk/lib/CodeGen/MachineBasicBlock.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineBasicBlock.cpp?rev=107778&r1=107777&r2=107778&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineBasicBlock.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineBasicBlock.cpp Wed Jul  7 09:33:51 2010
@@ -139,6 +139,13 @@
   Parent->getParent()->DeleteMachineInstr(MI);
 }
 
+MachineBasicBlock::iterator MachineBasicBlock::getFirstNonPHI() {
+  iterator I = begin();
+  while (I != end() && I->isPHI())
+    ++I;
+  return I;
+}
+
 MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
   iterator I = end();
   while (I != begin() && (--I)->getDesc().isTerminator())