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author | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-18 10:06:15 +0000 |
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committer | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-18 10:06:15 +0000 |
commit | 30a132f7676ec5465a2245cb94e7bd9214ea8eb7 (patch) | |
tree | 51251f8fa4f074b06bdef5e2042b1af10df722ec /lib/Target/SystemZ/SystemZISelDAGToDAG.cpp | |
parent | efb6c52efb4116b6a6d6c99192db68ab69025119 (diff) | |
download | llvm-30a132f7676ec5465a2245cb94e7bd9214ea8eb7.tar.gz llvm-30a132f7676ec5465a2245cb94e7bd9214ea8eb7.tar.bz2 llvm-30a132f7676ec5465a2245cb94e7bd9214ea8eb7.tar.xz |
[SystemZ] Use RXSBG
Extend the previous R.SBG patches to handle XORs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186570 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/SystemZ/SystemZISelDAGToDAG.cpp')
-rw-r--r-- | lib/Target/SystemZ/SystemZISelDAGToDAG.cpp | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp index aea08083c5..67e9d217ee 100644 --- a/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp +++ b/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp @@ -241,9 +241,9 @@ class SystemZDAGToDAGISel : public SelectionDAGISel { // Return the selected node on success, otherwise return null. SDNode *tryRISBGZero(SDNode *N); - // Try to use RISBG or ROSBG to implement OR node N. Return the selected - // node on success, otherwise return null. - SDNode *tryRISBGOrROSBG(SDNode *N); + // Try to use RISBG or Opcode to implement OR or XOR node N. + // Return the selected node on success, otherwise return null. + SDNode *tryRxSBG(SDNode *N, unsigned Opcode); // If Op0 is null, then Node is a constant that can be loaded using: // @@ -799,8 +799,8 @@ SDNode *SystemZDAGToDAGISel::tryRISBGZero(SDNode *N) { return convertTo(SDLoc(N), VT, SDValue(N, 0)).getNode(); } -SDNode *SystemZDAGToDAGISel::tryRISBGOrROSBG(SDNode *N) { - // Try treating each operand of N as the second operand of RISBG or ROSBG +SDNode *SystemZDAGToDAGISel::tryRxSBG(SDNode *N, unsigned Opcode) { + // Try treating each operand of N as the second operand of the RxSBG // and see which goes deepest. RxSBGOperands RxSBG[] = { N->getOperand(0), N->getOperand(1) }; unsigned Count[] = { 0, 0 }; @@ -817,15 +817,14 @@ SDNode *SystemZDAGToDAGISel::tryRISBGOrROSBG(SDNode *N) { SDValue Op0 = N->getOperand(I ^ 1); // Prefer IC for character insertions from memory. - if ((RxSBG[I].Mask & 0xff) == 0) + if (Opcode == SystemZ::ROSBG && (RxSBG[I].Mask & 0xff) == 0) if (LoadSDNode *Load = dyn_cast<LoadSDNode>(Op0.getNode())) if (Load->getMemoryVT() == MVT::i8) return 0; // See whether we can avoid an AND in the first operand by converting // ROSBG to RISBG. - unsigned Opcode = SystemZ::ROSBG; - if (detectOrAndInsertion(Op0, RxSBG[I].Mask)) + if (Opcode == SystemZ::ROSBG && detectOrAndInsertion(Op0, RxSBG[I].Mask)) Opcode = SystemZ::RISBG; EVT VT = N->getValueType(0); @@ -913,9 +912,14 @@ SDNode *SystemZDAGToDAGISel::Select(SDNode *Node) { switch (Opcode) { case ISD::OR: if (Node->getOperand(1).getOpcode() != ISD::Constant) - ResNode = tryRISBGOrROSBG(Node); - // Fall through. + ResNode = tryRxSBG(Node, SystemZ::ROSBG); + goto or_xor; + case ISD::XOR: + if (Node->getOperand(1).getOpcode() != ISD::Constant) + ResNode = tryRxSBG(Node, SystemZ::RXSBG); + // Fall through. + or_xor: // If this is a 64-bit operation in which both 32-bit halves are nonzero, // split the operation into two. if (!ResNode && Node->getValueType(0) == MVT::i64) @@ -931,7 +935,8 @@ SDNode *SystemZDAGToDAGISel::Select(SDNode *Node) { case ISD::ROTL: case ISD::SHL: case ISD::SRL: - ResNode = tryRISBGZero(Node); + if (!ResNode) + ResNode = tryRISBGZero(Node); break; case ISD::Constant: |