Minor fixes.

Added ConstantPool support.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53951 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsISelLowering.cpp

@@ -86,7 +86,7 @@ MipsTargetLowering(MipsTargetMachine &TM): TargetLowering(TM)
   setOperationAction(ISD::GlobalTLSAddress, MVT::i32,   Custom);
   setOperationAction(ISD::RET,              MVT::Other, Custom);
   setOperationAction(ISD::JumpTable,        MVT::i32,   Custom);
-  setOperationAction(ISD::ConstantPool,     MVT::f32,   Custom);
+  setOperationAction(ISD::ConstantPool,     MVT::i32,   Custom);
   setOperationAction(ISD::SELECT_CC,        MVT::i32,   Custom);
   setOperationAction(ISD::SELECT_CC,        MVT::f32,   Custom);
 
@@ -234,10 +234,14 @@ AddLiveIn(MachineFunction &MF, unsigned PReg, TargetRegisterClass *RC)
   return VReg;
 }
 
+// A address must be loaded from a small section if its size is less than the 
+// small section size threshold. Data in this section must be addressed using 
+// gp_rel operator.
+bool MipsTargetLowering::IsInSmallSection(unsigned Size) {
+  return (Size > 0 && (Size <= Subtarget->getSSectionThreshold()));
+}
+
 // Discover if this global address can be placed into small data/bss section. 
-// This should happen for globals with size less than small section size 
-// threshold in no abicall environments. Data in this section must be addressed 
-// using gp_rel operator.
 bool MipsTargetLowering::IsGlobalInSmallSection(GlobalValue *GV)
 {
   const TargetData *TD = getTargetData();
@@ -258,10 +262,7 @@ bool MipsTargetLowering::IsGlobalInSmallSection(GlobalValue *GV)
       return false;
   }
 
-  if (Size > 0 && (Size <= Subtarget->getSSectionThreshold()))
-    return true;
-
-  return false;
+  return IsInSmallSection(Size);
 }
 
 //===----------------------------------------------------------------------===//
@@ -352,8 +353,24 @@ LowerJumpTable(SDOperand Op, SelectionDAG &DAG)
 SDOperand MipsTargetLowering::
 LowerConstantPool(SDOperand Op, SelectionDAG &DAG) 
 {
-  assert(0 && "ConstantPool not implemented for MIPS.");
-  return SDOperand(); // Not reached
+  SDOperand ResNode;
+  ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
+  Constant *C = N->getConstVal();
+  SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment());
+
+  // gp_rel relocation
+  if (!Subtarget->hasABICall() &&  
+      IsInSmallSection(getTargetData()->getABITypeSize(C->getType()))) {
+    SDOperand GPRelNode = DAG.getNode(MipsISD::GPRel, MVT::i32, CP);
+    SDOperand GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i32);
+    ResNode = DAG.getNode(ISD::ADD, MVT::i32, GOT, GPRelNode); 
+  } else { // %hi/%lo relocation
+    SDOperand HiPart = DAG.getNode(MipsISD::Hi, MVT::i32, CP);
+    SDOperand Lo = DAG.getNode(MipsISD::Lo, MVT::i32, CP);
+    ResNode = DAG.getNode(ISD::ADD, MVT::i32, HiPart, Lo);
+  }
+
+  return ResNode;
 }
 
 //===----------------------------------------------------------------------===//

lib/Target/Mips/MipsISelLowering.h

@@ -61,8 +61,6 @@ namespace llvm {
   {
     // FrameIndex for return slot.
     int ReturnAddrIndex;
-
-    // const MipsSubtarget &MipsSubTarget;
   public:
 
     explicit MipsTargetLowering(MipsTargetMachine &TM);
@@ -87,6 +85,7 @@ namespace llvm {
     SDNode *LowerCallResult(SDOperand Chain, SDOperand InFlag, SDNode*TheCall,
                             unsigned CallingConv, SelectionDAG &DAG);
     bool IsGlobalInSmallSection(GlobalValue *GV); 
+    bool IsInSmallSection(unsigned Size); 
 
     // Lower Operand specifics
     SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG);

lib/Target/Mips/MipsInstrInfo.td

@@ -553,17 +553,24 @@ def : Pat<(MipsJmpLink (i32 texternalsym:$dst)),
 def : Pat<(MipsJmpLink CPURegs:$dst),
           (JALR CPURegs:$dst)>;
 
-// GlobalAddress, Constant Pool, ExternalSymbol, and JumpTable
+// hi/lo relocs
 def : Pat<(MipsHi tglobaladdr:$in), (LUi tglobaladdr:$in)>;
-//def : Pat<(MipsLo tglobaladdr:$in), (ADDiu ZERO, tglobaladdr:$in)>;
 def : Pat<(add CPURegs:$hi, (MipsLo tglobaladdr:$lo)),
           (ADDiu CPURegs:$hi, tglobaladdr:$lo)>;
+
 def : Pat<(MipsHi tjumptable:$in), (LUi tjumptable:$in)>;
-//def : Pat<(MipsLo tjumptable:$in), (ADDiu ZERO, tjumptable:$in)>;
 def : Pat<(add CPURegs:$hi, (MipsLo tjumptable:$lo)),
           (ADDiu CPURegs:$hi, tjumptable:$lo)>;
+
+def : Pat<(MipsHi tconstpool:$in), (LUi tconstpool:$in)>;
+def : Pat<(add CPURegs:$hi, (MipsLo tconstpool:$lo)),
+          (ADDiu CPURegs:$hi, tconstpool:$lo)>;
+
+// gp_rel relocs
 def : Pat<(add CPURegs:$gp, (MipsGPRel tglobaladdr:$in)), 
           (ADDiu CPURegs:$gp, tglobaladdr:$in)>;
+def : Pat<(add CPURegs:$gp, (MipsGPRel tconstpool:$in)), 
+          (ADDiu CPURegs:$gp, tconstpool:$in)>;
 
 // Mips does not have "not", so we expand our way
 def : Pat<(not CPURegs:$in),

lib/Target/Mips/MipsTargetAsmInfo.cpp

@@ -19,7 +19,7 @@ using namespace llvm;
 MipsTargetAsmInfo::MipsTargetAsmInfo(const MipsTargetMachine &TM):
   ELFTargetAsmInfo(TM) {
 
-  MipsTM = &TM;
+  Subtarget = &TM.getSubtarget<MipsSubtarget>();
 
   AlignmentIsInBytes          = false;
   COMMDirectiveTakesAlignment = true;
@@ -34,21 +34,25 @@ MipsTargetAsmInfo::MipsTargetAsmInfo(const MipsTargetMachine &TM):
   BSSSection                  = "\t.section\t.bss";
   LCOMMDirective              = "\t.lcomm\t";
   CStringSection              = ".rodata.str";
+  FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
 
-  if (!TM.getSubtarget<MipsSubtarget>().hasABICall())
+  if (!Subtarget->hasABICall()) {
     JumpTableDirective = "\t.word\t";
-  else
+    SmallDataSection = getNamedSection("\t.sdata", SectionFlags::Writeable);
+    SmallBSSSection = getNamedSection("\t.sbss", SectionFlags::Writeable | 
+                                      SectionFlags::BSS);
+  } else 
     JumpTableDirective = "\t.gpword\t";
 
-  SmallDataSection = getNamedSection("\t.sdata", SectionFlags::Writeable);
-  SmallBSSSection  = getNamedSection("\t.sbss",
-                         SectionFlags::Writeable | SectionFlags::BSS);
 }
 
 SectionKind::Kind
 MipsTargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
   SectionKind::Kind K = ELFTargetAsmInfo::SectionKindForGlobal(GV);
 
+  if (Subtarget->hasABICall())
+    return K;
+
   if (K != SectionKind::Data && K != SectionKind::BSS && 
       K != SectionKind::RODataMergeConst)
     return K;
@@ -56,8 +60,7 @@ MipsTargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
   if (isa<GlobalVariable>(GV)) {
     const TargetData *TD = ETM->getTargetData();
     unsigned Size = TD->getABITypeSize(GV->getType()->getElementType());
-    unsigned Threshold = 
-      MipsTM->getSubtarget<MipsSubtarget>().getSSectionThreshold();
+    unsigned Threshold = Subtarget->getSSectionThreshold();
      
     if (Size > 0 && Size <= Threshold) {
       if (K == SectionKind::BSS)

lib/Target/Mips/MipsTargetAsmInfo.h

@@ -14,11 +14,12 @@
 #ifndef MIPSTARGETASMINFO_H
 #define MIPSTARGETASMINFO_H
 
-#include "llvm/Target/TargetAsmInfo.h"
-#include "llvm/Target/ELFTargetAsmInfo.h"
+#include "MipsSubtarget.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/GlobalVariable.h"
+#include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/ELFTargetAsmInfo.h"
 
 namespace llvm {
 
@@ -36,8 +37,7 @@ namespace llvm {
     virtual const Section* SelectSectionForGlobal(const GlobalValue *GV) const;
 
     private:
-      const MipsTargetMachine *MipsTM; 
-
+      const MipsSubtarget *Subtarget;
   };
 
 } // namespace llvm