[mips] Instruction selection patterns for DSP-ASE vector shifts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179906 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 101 insertions, 6 deletions

diff --git a/lib/Target/Mips/MipsDSPInstrInfo.td b/lib/Target/Mips/MipsDSPInstrInfo.td
index 86983dd..6790a27 100644
--- a/lib/Target/Mips/MipsDSPInstrInfo.td
+++ b/lib/Target/Mips/MipsDSPInstrInfo.td
@@ -26,6 +26,8 @@ def SDT_MipsShilo : SDTypeProfile<1, 2, [SDTCisVT<0, untyped>,
                                          SDTCisSameAs<0, 2>, SDTCisVT<1, i32>]>;
 def SDT_MipsDPA : SDTypeProfile<1, 3, [SDTCisVT<0, untyped>, SDTCisSameAs<0, 3>,
                                        SDTCisVT<1, i32>, SDTCisSameAs<1, 2>]>;
+def SDT_MipsSHIFT_DSP : SDTypeProfile<1, 2, [SDTCisVec<0>, SDTCisSameAs<0, 1>,
+                                             SDTCisVT<2, i32>]>;
 
 class MipsDSPBase<string Opc, SDTypeProfile Prof> :
   SDNode<!strconcat("MipsISD::", Opc), Prof>;
@@ -74,6 +76,9 @@ def MipsMADD_DSP : MipsDSPBase<"MADD_DSP", SDT_MipsDPA>;
 def MipsMADDU_DSP : MipsDSPBase<"MADDU_DSP", SDT_MipsDPA>;
 def MipsMSUB_DSP : MipsDSPBase<"MSUB_DSP", SDT_MipsDPA>;
 def MipsMSUBU_DSP : MipsDSPBase<"MSUBU_DSP", SDT_MipsDPA>;
+def MipsSHLL_DSP : MipsDSPBase<"SHLL_DSP", SDT_MipsSHIFT_DSP>;
+def MipsSHRA_DSP : MipsDSPBase<"SHRA_DSP", SDT_MipsSHIFT_DSP>;
+def MipsSHRL_DSP : MipsDSPBase<"SHRL_DSP", SDT_MipsSHIFT_DSP>;
 
 // Flags.
 class UseAC {
@@ -348,6 +353,7 @@ class SHLL_QB_R2_DESC_BASE<string instr_asm, SDPatternOperator OpNode,
   list<dag> Pattern = [(set RC:$rd, (OpNode RC:$rt, ImmPat:$rs_sa))];
   InstrItinClass Itinerary = itin;
   list<Register> Defs = [DSPCtrl];
+  bit hasSideEffects = 1;
 }
 
 class LX_DESC_BASE<string instr_asm, SDPatternOperator OpNode,
@@ -659,19 +665,19 @@ class PRECEU_PH_QBRA_DESC : ABSQ_S_PH_R2_DESC_BASE<"preceu.ph.qbra",
                             ClearDefs;
 
 // Shift
-class SHLL_QB_DESC : SHLL_QB_R2_DESC_BASE<"shll.qb", int_mips_shll_qb, immZExt3,
+class SHLL_QB_DESC : SHLL_QB_R2_DESC_BASE<"shll.qb", null_frag, immZExt3,
                                           NoItinerary, DSPRegs>;
 
 class SHLLV_QB_DESC : SHLL_QB_R3_DESC_BASE<"shllv.qb", int_mips_shll_qb,
                                            NoItinerary, DSPRegs>;
 
-class SHRL_QB_DESC : SHLL_QB_R2_DESC_BASE<"shrl.qb", int_mips_shrl_qb, immZExt3,
+class SHRL_QB_DESC : SHLL_QB_R2_DESC_BASE<"shrl.qb", null_frag, immZExt3,
                                           NoItinerary, DSPRegs>, ClearDefs;
 
 class SHRLV_QB_DESC : SHLL_QB_R3_DESC_BASE<"shrlv.qb", int_mips_shrl_qb,
                                            NoItinerary, DSPRegs>, ClearDefs;
 
-class SHLL_PH_DESC : SHLL_QB_R2_DESC_BASE<"shll.ph", int_mips_shll_ph, immZExt4,
+class SHLL_PH_DESC : SHLL_QB_R2_DESC_BASE<"shll.ph", null_frag, immZExt4,
                                           NoItinerary, DSPRegs>;
 
 class SHLLV_PH_DESC : SHLL_QB_R3_DESC_BASE<"shllv.ph", int_mips_shll_ph,
@@ -683,7 +689,7 @@ class SHLL_S_PH_DESC : SHLL_QB_R2_DESC_BASE<"shll_s.ph", int_mips_shll_s_ph,
 class SHLLV_S_PH_DESC : SHLL_QB_R3_DESC_BASE<"shllv_s.ph", int_mips_shll_s_ph,
                                              NoItinerary, DSPRegs>;
 
-class SHRA_PH_DESC : SHLL_QB_R2_DESC_BASE<"shra.ph", int_mips_shra_ph, immZExt4,
+class SHRA_PH_DESC : SHLL_QB_R2_DESC_BASE<"shra.ph", null_frag, immZExt4,
                                           NoItinerary, DSPRegs>, ClearDefs;
 
 class SHRAV_PH_DESC : SHLL_QB_R3_DESC_BASE<"shrav.ph", int_mips_shra_ph,
@@ -1028,7 +1034,7 @@ class PRECR_SRA_R_PH_W_DESC : PRECR_SRA_PH_W_DESC_BASE<"precr_sra_r.ph.w",
                                                        CPURegs>, ClearDefs;
 
 // Shift
-class SHRA_QB_DESC : SHLL_QB_R2_DESC_BASE<"shra.qb", int_mips_shra_qb, immZExt3,
+class SHRA_QB_DESC : SHLL_QB_R2_DESC_BASE<"shra.qb", null_frag, immZExt3,
                                           NoItinerary, DSPRegs>, ClearDefs;
 
 class SHRAV_QB_DESC : SHLL_QB_R3_DESC_BASE<"shrav.qb", int_mips_shra_qb,
@@ -1041,7 +1047,7 @@ class SHRA_R_QB_DESC : SHLL_QB_R2_DESC_BASE<"shra_r.qb", int_mips_shra_r_qb,
 class SHRAV_R_QB_DESC : SHLL_QB_R3_DESC_BASE<"shrav_r.qb", int_mips_shra_r_qb,
                                              NoItinerary, DSPRegs>, ClearDefs;
 
-class SHRL_PH_DESC : SHLL_QB_R2_DESC_BASE<"shrl.ph", int_mips_shrl_ph, immZExt4,
+class SHRL_PH_DESC : SHLL_QB_R2_DESC_BASE<"shrl.ph", null_frag, immZExt4,
                                           NoItinerary, DSPRegs>, ClearDefs;
 
 class SHRLV_PH_DESC : SHLL_QB_R3_DESC_BASE<"shrlv.ph", int_mips_shrl_ph,
@@ -1280,6 +1286,24 @@ def : DSPBinPat<ADDSC, i32, addc>;
 def : DSPBinPat<ADDWC, i32, int_mips_addwc>;
 def : DSPBinPat<ADDWC, i32, adde>;
 
+// Shift immediate patterns.
+class DSPShiftPat<Instruction Inst, ValueType ValTy, SDPatternOperator Node,
+                  ImmLeaf Imm, Predicate Pred = HasDSP> :
+  DSPPat<(Node ValTy:$a, Imm:$shamt), (Inst ValTy:$a, Imm:$shamt), Pred>;
+
+def : DSPShiftPat<SHLL_PH, v2i16, MipsSHLL_DSP, immZExt4>;
+def : DSPShiftPat<SHRA_PH, v2i16, MipsSHRA_DSP, immZExt4>;
+def : DSPShiftPat<SHRL_PH, v2i16, MipsSHRL_DSP, immZExt4, HasDSPR2>;
+def : DSPShiftPat<SHLL_PH, v2i16, int_mips_shll_ph, immZExt4>;
+def : DSPShiftPat<SHRA_PH, v2i16, int_mips_shra_ph, immZExt4>;
+def : DSPShiftPat<SHRL_PH, v2i16, int_mips_shrl_ph, immZExt4, HasDSPR2>;
+def : DSPShiftPat<SHLL_QB, v4i8, MipsSHLL_DSP, immZExt3>;
+def : DSPShiftPat<SHRA_QB, v4i8, MipsSHRA_DSP, immZExt3, HasDSPR2>;
+def : DSPShiftPat<SHRL_QB, v4i8, MipsSHRL_DSP, immZExt3>;
+def : DSPShiftPat<SHLL_QB, v4i8, int_mips_shll_qb, immZExt3>;
+def : DSPShiftPat<SHRA_QB, v4i8, int_mips_shra_qb, immZExt3, HasDSPR2>;
+def : DSPShiftPat<SHRL_QB, v4i8, int_mips_shrl_qb, immZExt3>;
+
 // Extr patterns.
 class EXTR_W_TY1_R2_Pat<SDPatternOperator OpNode, Instruction Instr> :
   DSPPat<(i32 (OpNode CPURegs:$rs, ACRegsDSP:$ac)),
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 512eeef..9f136f4 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -197,6 +197,9 @@ const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
   case MipsISD::MADDU_DSP:         return "MipsISD::MADDU_DSP";
   case MipsISD::MSUB_DSP:          return "MipsISD::MSUB_DSP";
   case MipsISD::MSUBU_DSP:         return "MipsISD::MSUBU_DSP";
+  case MipsISD::SHLL_DSP:          return "MipsISD::SHLL_DSP";
+  case MipsISD::SHRA_DSP:          return "MipsISD::SHRA_DSP";
+  case MipsISD::SHRL_DSP:          return "MipsISD::SHRL_DSP";
   default:                         return NULL;
   }
 }
diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h
index 9e15b9a..e1e6055 100644
--- a/lib/Target/Mips/MipsISelLowering.h
+++ b/lib/Target/Mips/MipsISelLowering.h
@@ -143,6 +143,11 @@ namespace llvm {
       MSUB_DSP,
       MSUBU_DSP,
 
+      // DSP shift nodes.
+      SHLL_DSP,
+      SHRA_DSP,
+      SHRL_DSP,
+
       // Load/Store Left/Right nodes.
       LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
       LWR,
diff --git a/lib/Target/Mips/MipsSEISelLowering.cpp b/lib/Target/Mips/MipsSEISelLowering.cpp
index a4fcffb..efadaaa 100644
--- a/lib/Target/Mips/MipsSEISelLowering.cpp
+++ b/lib/Target/Mips/MipsSEISelLowering.cpp
@@ -52,6 +52,10 @@ MipsSETargetLowering::MipsSETargetLowering(MipsTargetMachine &TM)
       setOperationAction(ISD::STORE, VecTys[i], Legal);
       setOperationAction(ISD::BITCAST, VecTys[i], Legal);
     }
+
+    setTargetDAGCombine(ISD::SHL);
+    setTargetDAGCombine(ISD::SRA);
+    setTargetDAGCombine(ISD::SRL);
   }
 
   if (Subtarget->hasDSPR2())
@@ -314,6 +318,59 @@ static SDValue performSUBECombine(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
+static SDValue performDSPShiftCombine(unsigned Opc, SDNode *N, EVT Ty,
+                                      SelectionDAG &DAG,
+                                      const MipsSubtarget *Subtarget) {
+  // See if this is a vector splat immediate node.
+  APInt SplatValue, SplatUndef;
+  unsigned SplatBitSize;
+  bool HasAnyUndefs;
+  unsigned EltSize = Ty.getVectorElementType().getSizeInBits();
+  BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(N->getOperand(1));
+
+  if (!BV || !BV->isConstantSplat(SplatValue, SplatUndef, SplatBitSize,
+                                  HasAnyUndefs, EltSize,
+                                  !Subtarget->isLittle()))
+    return SDValue();
+
+  return DAG.getNode(Opc, N->getDebugLoc(), Ty, N->getOperand(0),
+                     DAG.getConstant(SplatValue.getZExtValue(), MVT::i32));
+}
+
+static SDValue performSHLCombine(SDNode *N, SelectionDAG &DAG,
+                                 TargetLowering::DAGCombinerInfo &DCI,
+                                 const MipsSubtarget *Subtarget) {
+  EVT Ty = N->getValueType(0);
+
+  if ((Ty != MVT::v2i16) && (Ty != MVT::v4i8))
+    return SDValue();
+
+  return performDSPShiftCombine(MipsISD::SHLL_DSP, N, Ty, DAG, Subtarget);
+}
+
+static SDValue performSRACombine(SDNode *N, SelectionDAG &DAG,
+                                 TargetLowering::DAGCombinerInfo &DCI,
+                                 const MipsSubtarget *Subtarget) {
+  EVT Ty = N->getValueType(0);
+
+  if ((Ty != MVT::v2i16) && ((Ty != MVT::v4i8) || !Subtarget->hasDSPR2()))
+    return SDValue();
+
+  return performDSPShiftCombine(MipsISD::SHRA_DSP, N, Ty, DAG, Subtarget);
+}
+
+
+static SDValue performSRLCombine(SDNode *N, SelectionDAG &DAG,
+                                 TargetLowering::DAGCombinerInfo &DCI,
+                                 const MipsSubtarget *Subtarget) {
+  EVT Ty = N->getValueType(0);
+
+  if (((Ty != MVT::v2i16) || !Subtarget->hasDSPR2()) && (Ty != MVT::v4i8))
+    return SDValue();
+
+  return performDSPShiftCombine(MipsISD::SHRL_DSP, N, Ty, DAG, Subtarget);
+}
+
 SDValue
 MipsSETargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
@@ -323,6 +380,12 @@ MipsSETargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const {
     return performADDECombine(N, DAG, DCI, Subtarget);
   case ISD::SUBE:
     return performSUBECombine(N, DAG, DCI, Subtarget);
+  case ISD::SHL:
+    return performSHLCombine(N, DAG, DCI, Subtarget);
+  case ISD::SRA:
+    return performSRACombine(N, DAG, DCI, Subtarget);
+  case ISD::SRL:
+    return performSRLCombine(N, DAG, DCI, Subtarget);
   default:
     return MipsTargetLowering::PerformDAGCombine(N, DCI);
   }