TargetLoweringBase &operator=(const TargetLoweringBase &) = delete;
virtual ~TargetLoweringBase() = default;
+ /// Return true if the target support strict float operation
+ bool isStrictFPEnabled() const {
+ return IsStrictFPEnabled;
+ }
+
protected:
/// Initialize all of the actions to default values.
void initActions();
/// details.
MachineBasicBlock *emitXRayTypedEvent(MachineInstr &MI,
MachineBasicBlock *MBB) const;
+
+ bool IsStrictFPEnabled;
};
/// This class defines information used to lower LLVM code to legal SelectionDAG
break;
}
case ISD::STRICT_FP_ROUND:
- // This expansion does not honor the "strict" properties anyway,
- // so prefer falling back to the non-strict operation if legal.
+ // When strict mode is enforced we can't do expansion because it
+ // does not honor the "strict" properties. Only libcall is allowed.
+ if (TLI.isStrictFPEnabled())
+ break;
+ // We might as well mutate to FP_ROUND when FP_ROUND operation is legal
+ // since this operation is more efficient than stack operation.
if (TLI.getStrictFPOperationAction(Node->getOpcode(),
Node->getValueType(0))
== TargetLowering::Legal)
break;
+ // We fall back to use stack operation when the FP_ROUND operation
+ // isn't available.
Tmp1 = EmitStackConvert(Node->getOperand(1),
Node->getValueType(0),
Node->getValueType(0), dl, Node->getOperand(0));
Results.push_back(Tmp1);
break;
case ISD::STRICT_FP_EXTEND:
- // This expansion does not honor the "strict" properties anyway,
- // so prefer falling back to the non-strict operation if legal.
+ // When strict mode is enforced we can't do expansion because it
+ // does not honor the "strict" properties. Only libcall is allowed.
+ if (TLI.isStrictFPEnabled())
+ break;
+ // We might as well mutate to FP_EXTEND when FP_EXTEND operation is legal
+ // since this operation is more efficient than stack operation.
if (TLI.getStrictFPOperationAction(Node->getOpcode(),
Node->getValueType(0))
== TargetLowering::Legal)
break;
+ // We fall back to use stack operation when the FP_EXTEND operation
+ // isn't available.
Tmp1 = EmitStackConvert(Node->getOperand(1),
Node->getOperand(1).getValueType(),
Node->getValueType(0), dl, Node->getOperand(0));
break;
}
- if (Results.empty() && Node->isStrictFPOpcode()) {
+ if (!TLI.isStrictFPEnabled() && Results.empty() && Node->isStrictFPOpcode()) {
// FIXME: We were asked to expand a strict floating-point operation,
// but there is currently no expansion implemented that would preserve
// the "strict" properties. For now, we just fall back to the non-strict
// best approach, except in the case where the resulting strict (scalar)
// operations would themselves use the fallback mutation to non-strict.
// In that specific case, just do the fallback on the vector op.
- if (Action == TargetLowering::Expand &&
+ if (Action == TargetLowering::Expand && !TLI.isStrictFPEnabled() &&
TLI.getStrictFPOperationAction(Node->getOpcode(),
- Node->getValueType(0))
+ Node->getValueType(0))
== TargetLowering::Legal) {
EVT EltVT = Node->getValueType(0).getVectorElementType();
if (TLI.getOperationAction(Node->getOpcode(), EltVT)
// we convert them to normal FP opcodes instead at this point. This
// will allow them to be handled by existing target-specific instruction
// selectors.
- if (Node->isStrictFPOpcode() &&
+ if (!TLI->isStrictFPEnabled() && Node->isStrictFPOpcode() &&
(TLI->getOperationAction(Node->getOpcode(), Node->getValueType(0))
== TargetLowering::Expand))
Node = CurDAG->mutateStrictFPToFP(Node);
cl::desc("Minimum density for building a jump table in "
"an optsize function"));
+// FIXME: This option is only to test if the strict fp operation processed
+// correctly by preventing mutating strict fp operation to normal fp operation
+// during development. When the backend supports strict float operation, this
+// option will be meaningless.
+static cl::opt<bool> DisableStrictNodeMutation("disable-strictnode-mutation",
+ cl::desc("Don't mutate strict-float node to a legalize node"),
+ cl::init(false), cl::Hidden);
+
static bool darwinHasSinCos(const Triple &TT) {
assert(TT.isOSDarwin() && "should be called with darwin triple");
// Don't bother with 32 bit x86.
BooleanVectorContents = UndefinedBooleanContent;
SchedPreferenceInfo = Sched::ILP;
GatherAllAliasesMaxDepth = 18;
+ IsStrictFPEnabled = DisableStrictNodeMutation;
// TODO: the default will be switched to 0 in the next commit, along
// with the Target-specific changes necessary.
MaxAtomicSizeInBitsSupported = 1024;
// than "STC;MVC". Handle the choice in target-specific code instead.
MaxStoresPerMemset = 0;
MaxStoresPerMemsetOptSize = 0;
+
+ // Default to having -disable-strictnode-mutation on
+ IsStrictFPEnabled = true;
}
EVT SystemZTargetLowering::getSetCCResultType(const DataLayout &DL,