[SystemZ] Use CLST to implement strcmp
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188544 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 7a9a4d7..b1812f2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5558,6 +5558,35 @@
return false;
}
+/// visitStrCmpCall - See if we can lower a call to strcmp in an optimized form.
+/// If so, return true and lower it, otherwise return false and it will be
+/// lowered like a normal call.
+bool SelectionDAGBuilder::visitStrCmpCall(const CallInst &I) {
+ // Verify that the prototype makes sense. int strcmp(void*,void*)
+ if (I.getNumArgOperands() != 2)
+ return false;
+
+ const Value *Arg0 = I.getArgOperand(0), *Arg1 = I.getArgOperand(1);
+ if (!Arg0->getType()->isPointerTy() ||
+ !Arg1->getType()->isPointerTy() ||
+ !I.getType()->isIntegerTy())
+ return false;
+
+ const TargetSelectionDAGInfo &TSI = DAG.getSelectionDAGInfo();
+ std::pair<SDValue, SDValue> Res =
+ TSI.EmitTargetCodeForStrcmp(DAG, getCurSDLoc(), DAG.getRoot(),
+ getValue(Arg0), getValue(Arg1),
+ MachinePointerInfo(Arg0),
+ MachinePointerInfo(Arg1));
+ if (Res.first.getNode()) {
+ processIntegerCallValue(I, Res.first, true);
+ PendingLoads.push_back(Res.second);
+ return true;
+ }
+
+ return false;
+}
+
/// visitUnaryFloatCall - If a call instruction is a unary floating-point
/// operation (as expected), translate it to an SDNode with the specified opcode
/// and return true.
@@ -5704,6 +5733,10 @@
if (visitMemCmpCall(I))
return;
break;
+ case LibFunc::strcmp:
+ if (visitStrCmpCall(I))
+ return;
+ break;
}
}
}