[Hexagon] Add a target feature to control using small data section

llvm-svn: 332292

4 files changed, 20 insertions, 16 deletions

diff --git a/llvm/lib/Target/Hexagon/Hexagon.td b/llvm/lib/Target/Hexagon/Hexagon.td
index 31e08cc1b04..6fa90d9ce62 100644
--- a/llvm/lib/Target/Hexagon/Hexagon.td
+++ b/llvm/lib/Target/Hexagon/Hexagon.td
@@ -54,6 +54,8 @@ def FeatureNVJ: SubtargetFeature<"nvj", "UseNewValueJumps", "true",
       "Support for new-value jumps", [FeaturePackets]>;
 def FeatureNVS: SubtargetFeature<"nvs", "UseNewValueStores", "true",
       "Support for new-value stores", [FeaturePackets]>;
+def FeatureSmallData: SubtargetFeature<"small-data", "UseSmallData", "true",
+      "Allow GP-relative addressing of global variables">;
 def FeatureDuplex: SubtargetFeature<"duplex", "EnableDuplex", "true",
       "Enable generation of duplex instruction">;
 def FeatureReservedR19: SubtargetFeature<"reserved-r19", "ReservedR19",
@@ -324,27 +326,27 @@ class Proc<string Name, SchedMachineModel Model,
 def : Proc<"hexagonv4",  HexagonModelV4,
            [ArchV4,
             FeatureDuplex, FeatureMemops, FeatureNVJ, FeatureNVS,
-            FeaturePackets]>;
+            FeaturePackets, FeatureSmallData]>;
 def : Proc<"hexagonv5",  HexagonModelV4,
            [ArchV4, ArchV5,
             FeatureDuplex, FeatureMemops, FeatureNVJ, FeatureNVS,
-            FeaturePackets]>;
+            FeaturePackets, FeatureSmallData]>;
 def : Proc<"hexagonv55", HexagonModelV55,
            [ArchV4, ArchV5, ArchV55,
             FeatureDuplex, FeatureMemops, FeatureNVJ, FeatureNVS,
-            FeaturePackets]>;
+            FeaturePackets, FeatureSmallData]>;
 def : Proc<"hexagonv60", HexagonModelV60,
            [ArchV4, ArchV5, ArchV55, ArchV60,
             FeatureDuplex, FeatureMemops, FeatureNVJ, FeatureNVS,
-            FeaturePackets]>;
+            FeaturePackets, FeatureSmallData]>;
 def : Proc<"hexagonv62", HexagonModelV62,
            [ArchV4, ArchV5, ArchV55, ArchV60, ArchV62,
             FeatureDuplex, FeatureMemops, FeatureNVJ, FeatureNVS,
-            FeaturePackets]>;
+            FeaturePackets, FeatureSmallData]>;
 def : Proc<"hexagonv65", HexagonModelV65,
            [ArchV4, ArchV5, ArchV55, ArchV60, ArchV62, ArchV65,
             FeatureDuplex, FeatureMemNoShuf, FeatureMemops, FeatureNVJ,
-            FeatureNVS, FeaturePackets]>;
+            FeatureNVS, FeaturePackets, FeatureSmallData]>;
 
 //===----------------------------------------------------------------------===//
 // Declare the target which we are implementing
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index fbe8f16bd98..ce42a9bd70f 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1016,7 +1016,7 @@ HexagonTargetLowering::LowerGLOBALADDRESS(SDValue Op, SelectionDAG &DAG) const {
   if (RM == Reloc::Static) {
     SDValue GA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, Offset);
     const GlobalObject *GO = GV->getBaseObject();
-    if (GO && HLOF.isGlobalInSmallSection(GO, HTM))
+    if (GO && Subtarget.useSmallData() && HLOF.isGlobalInSmallSection(GO, HTM))
       return DAG.getNode(HexagonISD::CONST32_GP, dl, PtrVT, GA);
     return DAG.getNode(HexagonISD::CONST32, dl, PtrVT, GA);
   }
diff --git a/llvm/lib/Target/Hexagon/HexagonSplitConst32AndConst64.cpp b/llvm/lib/Target/Hexagon/HexagonSplitConst32AndConst64.cpp
index 3fe4cc73d2f..c41f0d3c085 100644
--- a/llvm/lib/Target/Hexagon/HexagonSplitConst32AndConst64.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonSplitConst32AndConst64.cpp
@@ -60,14 +60,14 @@ INITIALIZE_PASS(HexagonSplitConst32AndConst64, "split-const-for-sdata",
       "Hexagon Split Const32s and Const64s", false, false)
 
 bool HexagonSplitConst32AndConst64::runOnMachineFunction(MachineFunction &Fn) {
-  const HexagonTargetObjectFile &TLOF =
-      *static_cast<const HexagonTargetObjectFile *>(
-          Fn.getTarget().getObjFileLowering());
-  if (TLOF.isSmallDataEnabled())
-    return true;
+  auto &HST = Fn.getSubtarget<HexagonSubtarget>();
+  auto &HTM = static_cast<const HexagonTargetMachine&>(Fn.getTarget());
+  auto &TLOF = *HTM.getObjFileLowering();
+  if (HST.useSmallData() && TLOF.isSmallDataEnabled())
+    return false;
 
-  const TargetInstrInfo *TII = Fn.getSubtarget().getInstrInfo();
-  const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
+  const TargetInstrInfo *TII = HST.getInstrInfo();
+  const TargetRegisterInfo *TRI = HST.getRegisterInfo();
 
   // Loop over all of the basic blocks
   for (MachineBasicBlock &B : Fn) {
@@ -109,7 +109,6 @@ bool HexagonSplitConst32AndConst64::runOnMachineFunction(MachineFunction &Fn) {
 //===----------------------------------------------------------------------===//
 //                         Public Constructor Functions
 //===----------------------------------------------------------------------===//
-
 FunctionPass *llvm::createHexagonSplitConst32AndConst64() {
   return new HexagonSplitConst32AndConst64();
 }
diff --git a/llvm/lib/Target/Hexagon/HexagonSubtarget.h b/llvm/lib/Target/Hexagon/HexagonSubtarget.h
index b8f7db6ae20..936971fbced 100644
--- a/llvm/lib/Target/Hexagon/HexagonSubtarget.h
+++ b/llvm/lib/Target/Hexagon/HexagonSubtarget.h
@@ -55,6 +55,7 @@ class HexagonSubtarget : public HexagonGenSubtargetInfo {
   bool UsePackets = false;
   bool UseNewValueJumps = false;
   bool UseNewValueStores = false;
+  bool UseSmallData = false;
 
   bool HasMemNoShuf = false;
   bool EnableDuplex = false;
@@ -153,10 +154,13 @@ public:
   bool hasV65TOpsOnly() const {
     return getHexagonArchVersion() == Hexagon::ArchEnum::V65;
   }
+
+  bool useLongCalls() const { return UseLongCalls; }
   bool useMemops() const { return UseMemops; }
   bool usePackets() const { return UsePackets; }
   bool useNewValueJumps() const { return UseNewValueJumps; }
   bool useNewValueStores() const { return UseNewValueStores; }
+  bool useSmallData() const { return UseSmallData; }
 
   bool modeIEEERndNear() const { return ModeIEEERndNear; }
   bool useHVXOps() const { return HexagonHVXVersion > Hexagon::ArchEnum::V4; }
@@ -165,7 +169,6 @@ public:
 
   bool hasMemNoShuf() const { return HasMemNoShuf; }
   bool hasReservedR19() const { return ReservedR19; }
-  bool useLongCalls() const { return UseLongCalls; }
   bool usePredicatedCalls() const;
 
   bool useBSBScheduling() const { return UseBSBScheduling; }