Fix a problem on itanium with memset. The value to set has been promoted to

i64 before this code, so zero_ext doesn't work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26290 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 5a45323c38a580062b75124bc15fe7fd489d7457..67877c3d5f72b9fc4a4533583f9f1e08e4d5a279 100644 (file)
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1661,8 +1661,12 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
       const char *FnName = 0;
       if (Node->getOpcode() == ISD::MEMSET) {
         Args.push_back(std::make_pair(Tmp2, IntPtrTy));
-        // Extend the ubyte argument to be an int value for the call.
-        Tmp3 = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Tmp3);
+        // Extend the (previously legalized) ubyte argument to be an int value
+        // for the call.
+        if (Tmp3.getValueType() > MVT::i32)
+          Tmp3 = DAG.getNode(ISD::TRUNCATE, MVT::i32, Tmp3);
+        else
+          Tmp3 = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Tmp3);
         Args.push_back(std::make_pair(Tmp3, Type::IntTy));
         Args.push_back(std::make_pair(Tmp4, IntPtrTy));