Changed phi elimination code
llvm-svn: 1311
diff --git a/llvm/lib/CodeGen/InstrSelection/InstrSelection.cpp b/llvm/lib/CodeGen/InstrSelection/InstrSelection.cpp
index 909f241..f32165e 100644
--- a/llvm/lib/CodeGen/InstrSelection/InstrSelection.cpp
+++ b/llvm/lib/CodeGen/InstrSelection/InstrSelection.cpp
@@ -180,7 +180,7 @@
}
-
+#if 0
//-------------------------------------------------------------------------
// This method inserts phi elimination code for all BBs in a method
//-------------------------------------------------------------------------
@@ -224,6 +224,69 @@
} // for all BBs in method
}
+#endif
+
+
+//-------------------------------------------------------------------------
+// This method inserts phi elimination code for all BBs in a method
+//-------------------------------------------------------------------------
+void InsertCode4AllPhisInMeth(Method *method, TargetMachine &target) {
+
+
+ // for all basic blocks in method
+ //
+ for (Method::iterator BI = method->begin(); BI != method->end(); ++BI) {
+
+ BasicBlock *BB = *BI;
+ const BasicBlock::InstListType &InstList = BB->getInstList();
+ BasicBlock::InstListType::const_iterator IIt = InstList.begin();
+
+ // for all instructions in the basic block
+ //
+ for( ; IIt != InstList.end(); ++IIt ) {
+
+ if( (*IIt)->getOpcode() == Instruction::PHINode ) {
+
+ PHINode *PN = (PHINode *) (*IIt);
+
+ Value *PhiCpRes =
+ new Value(PN->getType(), PN->getValueType() );
+
+ // for each incoming value of the phi, insert phi elimination
+ //
+ for (unsigned i = 0; i < PN->getNumIncomingValues(); ++i) {
+
+ // insert the copy instruction to the predecessor BB
+
+ MachineInstr *CpMI =
+ target.getRegInfo().cpValue2Value(PN->getIncomingValue(i),
+ PhiCpRes);
+
+ InsertPhiElimInst(PN->getIncomingBlock(i), CpMI);
+
+ }
+
+
+ MachineInstr *CpMI2 =
+ target.getRegInfo().cpValue2Value(PhiCpRes, PN);
+
+ // get an iterator to machine instructions in the BB
+ MachineCodeForBasicBlock& bbMvec = BB->getMachineInstrVec();
+
+ bbMvec.insert( bbMvec.begin(), CpMI2);
+
+
+ }
+ else break; // since PHI nodes can only be at the top
+
+ } // for each Phi Instr in BB
+
+ } // for all BBs in method
+
+}
+
+
+