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-rw-r--r--llvm/lib/Target/ARM/ARMAsmPrinter.cpp13
-rw-r--r--llvm/lib/Target/ARM/ARMAsmPrinter.h9
-rw-r--r--llvm/lib/Target/ARM/ARMISelLowering.cpp111
-rw-r--r--llvm/lib/Target/ARM/ARMMachineFunctionInfo.h13
4 files changed, 1 insertions, 145 deletions
diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
index 8d44a26b1db..186c6431481 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -97,13 +97,6 @@ void ARMAsmPrinter::EmitXXStructor(const DataLayout &DL, const Constant *CV) {
OutStreamer->EmitValue(E, Size);
}
-void ARMAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
- if (PromotedGlobals.count(GV))
- // The global was promoted into a constant pool. It should not be emitted.
- return;
- AsmPrinter::EmitGlobalVariable(GV);
-}
-
/// runOnMachineFunction - This uses the EmitInstruction()
/// method to print assembly for each instruction.
///
@@ -116,12 +109,6 @@ bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
const Function* F = MF.getFunction();
const TargetMachine& TM = MF.getTarget();
- // Collect all globals that had their storage promoted to a constant pool.
- // Functions are emitted before variables, so this accumulates promoted
- // globals from all functions in PromotedGlobals.
- for (auto *GV : AFI->getGlobalsPromotedToConstantPool())
- PromotedGlobals.insert(GV);
-
// Calculate this function's optimization goal.
unsigned OptimizationGoal;
if (F->hasFnAttribute(Attribute::OptimizeNone))
diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.h b/llvm/lib/Target/ARM/ARMAsmPrinter.h
index 30abdbc322a..97f5ca0ecbc 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.h
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.h
@@ -56,12 +56,6 @@ class LLVM_LIBRARY_VISIBILITY ARMAsmPrinter : public AsmPrinter {
/// -1 if uninitialized, 0 if conflicting goals
int OptimizationGoals;
- /// List of globals that have had their storage promoted to a constant
- /// pool. This lives between calls to runOnMachineFunction and collects
- /// data from every MachineFunction. It is used during doFinalization
- /// when all non-function globals are emitted.
- SmallPtrSet<const GlobalVariable*,2> PromotedGlobals;
-
public:
explicit ARMAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer);
@@ -96,8 +90,7 @@ public:
void EmitStartOfAsmFile(Module &M) override;
void EmitEndOfAsmFile(Module &M) override;
void EmitXXStructor(const DataLayout &DL, const Constant *CV) override;
- void EmitGlobalVariable(const GlobalVariable *GV) override;
-
+
// lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 7c8fe5d14f1..434b4546483 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -59,24 +59,12 @@ using namespace llvm;
STATISTIC(NumTailCalls, "Number of tail calls");
STATISTIC(NumMovwMovt, "Number of GAs materialized with movw + movt");
STATISTIC(NumLoopByVals, "Number of loops generated for byval arguments");
-STATISTIC(NumConstpoolPromoted,
- "Number of constants with their storage promoted into constant pools");
static cl::opt<bool>
ARMInterworking("arm-interworking", cl::Hidden,
cl::desc("Enable / disable ARM interworking (for debugging only)"),
cl::init(true));
-static cl::opt<bool> EnableConstpoolPromotion(
- "arm-promote-constant", cl::Hidden,
- cl::desc("Enable / disable promotion of unnamed_addr constants into "
- "constant pools"),
- cl::init(true));
-static cl::opt<unsigned> ConstpoolPromotionMaxSize(
- "arm-promote-constant-max-size", cl::Hidden,
- cl::desc("Maximum size of constant to promote into a constant pool"),
- cl::init(64));
-
namespace {
class ARMCCState : public CCState {
public:
@@ -2975,100 +2963,6 @@ ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
llvm_unreachable("bogus TLS model");
}
-/// Return true if all users of V are within function F, looking through
-/// ConstantExprs.
-static bool allUsersAreInFunction(const Value *V, const Function *F) {
- SmallVector<const User*,4> Worklist;
- for (auto *U : V->users())
- Worklist.push_back(U);
- while (!Worklist.empty()) {
- auto *U = Worklist.pop_back_val();
- if (isa<ConstantExpr>(U)) {
- for (auto *UU : U->users())
- Worklist.push_back(UU);
- continue;
- }
-
- auto *I = dyn_cast<Instruction>(U);
- if (!I || I->getParent()->getParent() != F)
- return false;
- }
- return true;
-}
-
-/// Return true if all users of V are within some (any) function, looking through
-/// ConstantExprs. In other words, are there any global constant users?
-static bool allUsersAreInFunctions(const Value *V) {
- SmallVector<const User*,4> Worklist;
- for (auto *U : V->users())
- Worklist.push_back(U);
- while (!Worklist.empty()) {
- auto *U = Worklist.pop_back_val();
- if (isa<ConstantExpr>(U)) {
- for (auto *UU : U->users())
- Worklist.push_back(UU);
- continue;
- }
-
- if (!isa<Instruction>(U))
- return false;
- }
- return true;
-}
-
-static SDValue promoteToConstantPool(const GlobalValue *GV, SelectionDAG &DAG,
- EVT PtrVT, SDLoc dl) {
- // If we're creating a pool entry for a constant global with unnamed address,
- // and the global is small enough, we can emit it inline into the constant pool
- // to save ourselves an indirection.
- //
- // This is a win if the constant is only used in one function (so it doesn't
- // need to be duplicated) or duplicating the constant wouldn't increase code
- // size (implying the constant is no larger than 4 bytes).
- const Function *F = DAG.getMachineFunction().getFunction();
- auto *GVar = dyn_cast<GlobalVariable>(GV);
- if (EnableConstpoolPromotion && GVar && GVar->hasInitializer() &&
- GVar->isConstant() && GVar->hasGlobalUnnamedAddr() && GVar->hasLocalLinkage()) {
- // The constant islands pass can only really deal with alignment requests
- // <= 4 bytes and cannot pad constants itself. Therefore we cannot promote
- // any type wanting greater alignment requirements than 4 bytes. We also
- // can only promote constants that are multiples of 4 bytes in size or
- // are paddable to a multiple of 4. Currently we only try and pad constants
- // that are strings for simplicity.
- auto *Init = GVar->getInitializer();
- auto *CDAInit = dyn_cast<ConstantDataArray>(Init);
- unsigned Size = DAG.getDataLayout().getTypeAllocSize(Init->getType());
- unsigned Align = DAG.getDataLayout().getABITypeAlignment(Init->getType());
- unsigned RequiredPadding = 4 - (Size % 4);
- bool PaddingPossible =
- RequiredPadding == 4 || (CDAInit && CDAInit->isString());
-
- if (PaddingPossible && Align <= 4 && Size <= ConstpoolPromotionMaxSize &&
- (allUsersAreInFunction(GVar, F) ||
- (Size <= 4 && allUsersAreInFunctions(GVar)))) {
- if (RequiredPadding != 4) {
- StringRef S = CDAInit->getAsString();
-
- SmallVector<uint8_t,16> V(S.size());
- std::copy(S.bytes_begin(), S.bytes_end(), V.begin());
- while (RequiredPadding--)
- V.push_back(0);
- Init = ConstantDataArray::get(*DAG.getContext(), V);
- }
-
- SDValue CPAddr =
- DAG.getTargetConstantPool(Init, PtrVT, Align);
-
- MachineFunction &MF = DAG.getMachineFunction();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- AFI->markGlobalAsPromotedToConstantPool(GVar);
- ++NumConstpoolPromoted;
- return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
- }
- }
- return SDValue();
-}
-
SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
SelectionDAG &DAG) const {
EVT PtrVT = getPointerTy(DAG.getDataLayout());
@@ -3080,11 +2974,6 @@ SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
bool IsRO =
(isa<GlobalVariable>(GV) && cast<GlobalVariable>(GV)->isConstant()) ||
isa<Function>(GV);
-
- if (TM.shouldAssumeDSOLocal(*GV->getParent(), GV))
- if (SDValue V = promoteToConstantPool(GV, DAG, PtrVT, dl))
- return V;
-
if (isPositionIndependent()) {
bool UseGOT_PREL = !TM.shouldAssumeDSOLocal(*GV->getParent(), GV);
diff --git a/llvm/lib/Target/ARM/ARMMachineFunctionInfo.h b/llvm/lib/Target/ARM/ARMMachineFunctionInfo.h
index 52ba6a49fd5..f71497240ff 100644
--- a/llvm/lib/Target/ARM/ARMMachineFunctionInfo.h
+++ b/llvm/lib/Target/ARM/ARMMachineFunctionInfo.h
@@ -121,9 +121,6 @@ class ARMFunctionInfo : public MachineFunctionInfo {
/// copies.
bool IsSplitCSR;
- /// Globals that have had their storage promoted into the constant pool.
- SmallVector<const GlobalVariable*,2> PromotedGlobals;
-
public:
ARMFunctionInfo() :
isThumb(false),
@@ -229,16 +226,6 @@ public:
}
return It;
}
-
- /// Indicate to the backend that \c GV has had its storage changed to inside
- /// a constant pool. This means it no longer needs to be emitted as a
- /// global variable.
- void markGlobalAsPromotedToConstantPool(const GlobalVariable *GV) {
- PromotedGlobals.push_back(GV);
- }
- ArrayRef<const GlobalVariable*> getGlobalsPromotedToConstantPool() {
- return PromotedGlobals;
- }
};
} // End llvm namespace
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