Add an x86 peep that narrows TEST instructions to forms that use
a smaller encoding. These kinds of patterns are very frequent in
sqlite3, for example.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79439 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 75de203..f5de81b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4586,6 +4586,17 @@
return getNode(~Opcode, dl, ResultTys, Ops, NumOps).getNode();
}
+/// getTargetExtractSubreg - A convenience function for creating
+/// TargetInstrInfo::EXTRACT_SUBREG nodes.
+SDValue
+SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
+ SDValue Operand) {
+ SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
+ SDNode *Subreg = getTargetNode(TargetInstrInfo::EXTRACT_SUBREG, DL,
+ VT, Operand, SRIdxVal);
+ return SDValue(Subreg, 0);
+}
+
/// getNodeIfExists - Get the specified node if it's already available, or
/// else return NULL.
SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,