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.

llvm-svn: 79439

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 75de2035796..f5de81b9425 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4586,6 +4586,17 @@ SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl,
   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,