Initial libcall support for LegalizeTypes. This is

much simpler than in LegalizeDAG because calls are
not yet expanded into call sequences: that happens
after type legalization has finished.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49634 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 116 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
index 34f99da..c26656a 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "LegalizeTypes.h"
+#include "llvm/CallingConv.h"
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/Support/CommandLine.h"
@@ -524,6 +525,29 @@ void DAGTypeLegalizer::SplitInteger(SDOperand Op,
   SplitInteger(Op, HalfVT, HalfVT, Lo, Hi);
 }
 
+/// MakeLibCall - Expand a node into a libcall and return the result.
+SDOperand DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, SDNode *N,
+                                        bool isSigned) {
+  TargetLowering::ArgListTy Args;
+  TargetLowering::ArgListEntry Entry;
+  for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
+    MVT::ValueType ArgVT = N->getOperand(i).getValueType();
+    Entry.Node = N->getOperand(i);
+    Entry.Ty = MVT::getTypeForValueType(ArgVT);
+    Entry.isSExt = isSigned;
+    Entry.isZExt = !isSigned;
+    Args.push_back(Entry);
+  }
+  SDOperand Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
+                                           TLI.getPointerTy());
+
+  const Type *RetTy = MVT::getTypeForValueType(N->getValueType(0));
+  std::pair<SDOperand,SDOperand> CallInfo =
+    TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
+                    CallingConv::C, false, Callee, Args, DAG);
+  return CallInfo.first;
+}
+
 //===----------------------------------------------------------------------===//
 //  Entry Point
 //===----------------------------------------------------------------------===//
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index b5ec7d1..d2196f3 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -169,6 +169,7 @@ private:
   void SplitInteger(SDOperand Op, SDOperand &Lo, SDOperand &Hi);
   void SplitInteger(SDOperand Op, MVT::ValueType LoVT, MVT::ValueType HiVT,
                     SDOperand &Lo, SDOperand &Hi);
+  SDOperand MakeLibCall(RTLIB::Libcall LC, SDNode *N, bool isSigned);
 
   //===--------------------------------------------------------------------===//
   // Promotion Support: LegalizeTypesPromote.cpp
@@ -262,6 +263,8 @@ private:
   void ExpandResult_TRUNCATE   (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_UNDEF      (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_ZERO_EXTEND(SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_FP_TO_SINT (SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_FP_TO_UINT (SDNode *N, SDOperand &Lo, SDOperand &Hi);
 
   void ExpandResult_Logical    (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_BSWAP      (SDNode *N, SDOperand &Lo, SDOperand &Hi);
@@ -271,6 +274,10 @@ private:
   void ExpandResult_SELECT     (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_SELECT_CC  (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_MUL        (SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_SDIV       (SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_SREM       (SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_UDIV       (SDNode *N, SDOperand &Lo, SDOperand &Hi);
+  void ExpandResult_UREM       (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   void ExpandResult_Shift      (SDNode *N, SDOperand &Lo, SDOperand &Hi);
   
   void ExpandShiftByConstant(SDNode *N, unsigned Amt, 
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypesExpand.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypesExpand.cpp
index fcde8f3..5cb1562 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypesExpand.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypesExpand.cpp
@@ -64,6 +64,8 @@ void DAGTypeLegalizer::ExpandResult(SDNode *N, unsigned ResNo) {
   case ISD::TRUNCATE:    ExpandResult_TRUNCATE(N, Lo, Hi); break;
   case ISD::BIT_CONVERT: ExpandResult_BIT_CONVERT(N, Lo, Hi); break;
   case ISD::SIGN_EXTEND_INREG: ExpandResult_SIGN_EXTEND_INREG(N, Lo, Hi); break;
+  case ISD::FP_TO_SINT:  ExpandResult_FP_TO_SINT(N, Lo, Hi); break;
+  case ISD::FP_TO_UINT:  ExpandResult_FP_TO_UINT(N, Lo, Hi); break;
   case ISD::LOAD:        ExpandResult_LOAD(cast<LoadSDNode>(N), Lo, Hi); break;
     
   case ISD::AND:
@@ -79,6 +81,10 @@ void DAGTypeLegalizer::ExpandResult(SDNode *N, unsigned ResNo) {
   case ISD::SELECT:      ExpandResult_SELECT(N, Lo, Hi); break;
   case ISD::SELECT_CC:   ExpandResult_SELECT_CC(N, Lo, Hi); break;
   case ISD::MUL:         ExpandResult_MUL(N, Lo, Hi); break;
+  case ISD::SDIV:        ExpandResult_SDIV(N, Lo, Hi); break;
+  case ISD::SREM:        ExpandResult_SREM(N, Lo, Hi); break;
+  case ISD::UDIV:        ExpandResult_UDIV(N, Lo, Hi); break;
+  case ISD::UREM:        ExpandResult_UREM(N, Lo, Hi); break;
   case ISD::SHL:
   case ISD::SRA:
   case ISD::SRL:         ExpandResult_Shift(N, Lo, Hi); break;
@@ -315,6 +321,62 @@ ExpandResult_SIGN_EXTEND_INREG(SDNode *N, SDOperand &Lo, SDOperand &Hi) {
   }
 }
 
+void DAGTypeLegalizer::ExpandResult_FP_TO_SINT(SDNode *N, SDOperand &Lo,
+                                               SDOperand &Hi) {
+  MVT::ValueType VT = N->getValueType(0);
+  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
+  if (VT == MVT::i64) {
+    if (N->getOperand(0).getValueType() == MVT::f32)
+      LC = RTLIB::FPTOSINT_F32_I64;
+    else if (N->getOperand(0).getValueType() == MVT::f64)
+      LC = RTLIB::FPTOSINT_F64_I64;
+    else if (N->getOperand(0).getValueType() == MVT::f80)
+      LC = RTLIB::FPTOSINT_F80_I64;
+    else if (N->getOperand(0).getValueType() == MVT::ppcf128)
+      LC = RTLIB::FPTOSINT_PPCF128_I64;
+  } else if (VT == MVT::i128) {
+    if (N->getOperand(0).getValueType() == MVT::f32)
+      LC = RTLIB::FPTOSINT_F32_I128;
+    else if (N->getOperand(0).getValueType() == MVT::f64)
+      LC = RTLIB::FPTOSINT_F64_I128;
+    else if (N->getOperand(0).getValueType() == MVT::f80)
+      LC = RTLIB::FPTOSINT_F80_I128;
+    else if (N->getOperand(0).getValueType() == MVT::ppcf128)
+      LC = RTLIB::FPTOSINT_PPCF128_I128;
+  } else {
+    assert(0 && "Unexpected fp-to-sint conversion!");
+  }
+  SplitInteger(MakeLibCall(LC, N, true/*sign irrelevant*/), Lo, Hi);
+}
+
+void DAGTypeLegalizer::ExpandResult_FP_TO_UINT(SDNode *N, SDOperand &Lo,
+                                               SDOperand &Hi) {
+  MVT::ValueType VT = N->getValueType(0);
+  RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
+  if (VT == MVT::i64) {
+    if (N->getOperand(0).getValueType() == MVT::f32)
+      LC = RTLIB::FPTOUINT_F32_I64;
+    else if (N->getOperand(0).getValueType() == MVT::f64)
+      LC = RTLIB::FPTOUINT_F64_I64;
+    else if (N->getOperand(0).getValueType() == MVT::f80)
+      LC = RTLIB::FPTOUINT_F80_I64;
+    else if (N->getOperand(0).getValueType() == MVT::ppcf128)
+      LC = RTLIB::FPTOUINT_PPCF128_I64;
+  } else if (VT == MVT::i128) {
+    if (N->getOperand(0).getValueType() == MVT::f32)
+      LC = RTLIB::FPTOUINT_F32_I128;
+    else if (N->getOperand(0).getValueType() == MVT::f64)
+      LC = RTLIB::FPTOUINT_F64_I128;
+    else if (N->getOperand(0).getValueType() == MVT::f80)
+      LC = RTLIB::FPTOUINT_F80_I128;
+    else if (N->getOperand(0).getValueType() == MVT::ppcf128)
+      LC = RTLIB::FPTOUINT_PPCF128_I128;
+  } else {
+    assert(0 && "Unexpected fp-to-uint conversion!");
+  }
+  SplitInteger(MakeLibCall(LC, N, false/*sign irrelevant*/), Lo, Hi);
+}
+
 void DAGTypeLegalizer::ExpandResult_LOAD(LoadSDNode *N,
                                          SDOperand &Lo, SDOperand &Hi) {
   MVT::ValueType VT = N->getValueType(0);
@@ -614,6 +676,29 @@ void DAGTypeLegalizer::ExpandResult_MUL(SDNode *N,
 #endif
 }  
 
+void DAGTypeLegalizer::ExpandResult_SDIV(SDNode *N,
+                                         SDOperand &Lo, SDOperand &Hi) {
+  assert(N->getValueType(0) == MVT::i64 && "Unsupported sdiv!");
+  SplitInteger(MakeLibCall(RTLIB::SDIV_I64, N, true), Lo, Hi);
+}
+
+void DAGTypeLegalizer::ExpandResult_SREM(SDNode *N,
+                                         SDOperand &Lo, SDOperand &Hi) {
+  assert(N->getValueType(0) == MVT::i64 && "Unsupported srem!");
+  SplitInteger(MakeLibCall(RTLIB::SREM_I64, N, true), Lo, Hi);
+}
+
+void DAGTypeLegalizer::ExpandResult_UDIV(SDNode *N,
+                                         SDOperand &Lo, SDOperand &Hi) {
+  assert(N->getValueType(0) == MVT::i64 && "Unsupported udiv!");
+  SplitInteger(MakeLibCall(RTLIB::UDIV_I64, N, false), Lo, Hi);
+}
+
+void DAGTypeLegalizer::ExpandResult_UREM(SDNode *N,
+                                         SDOperand &Lo, SDOperand &Hi) {
+  assert(N->getValueType(0) == MVT::i64 && "Unsupported urem!");
+  SplitInteger(MakeLibCall(RTLIB::UREM_I64, N, false), Lo, Hi);
+}
 
 void DAGTypeLegalizer::ExpandResult_Shift(SDNode *N,
                                           SDOperand &Lo, SDOperand &Hi) {