class MachineFunction;
class MachineInstr;
class MachineJumpTableInfo;
+ class MachineLoop;
class Mangler;
class MCContext;
class MCExpr;
return true;
}
+ /// \brief Return true if it is cheap to speculate a call to intrinsic cttz.
+ virtual bool isCheapToSpeculateCttz() const {
+ return false;
+ }
+
+ /// \brief Return true if it is cheap to speculate a call to intrinsic ctlz.
+ virtual bool isCheapToSpeculateCtlz() const {
+ return false;
+ }
+
/// \brief Return if the target supports combining a
/// chain like:
/// \code
return MaskAndBranchFoldingIsLegal;
}
+ /// \brief Return true if the target wants to use the optimization that
+ /// turns ext(promotableInst1(...(promotableInstN(load)))) into
+ /// promotedInst1(...(promotedInstN(ext(load)))).
+ bool enableExtLdPromotion() const { return EnableExtLdPromotion; }
+
/// Return true if the target can combine store(extractelement VectorTy,
/// Idx).
/// \p Cost[out] gives the cost of that transformation when this is true.
/// Return how this load with extension should be treated: either it is legal,
/// needs to be promoted to a larger size, needs to be expanded to some other
/// code sequence, or the target has a custom expander for it.
- LegalizeAction getLoadExtAction(unsigned ExtType, EVT VT) const {
- if (VT.isExtended()) return Expand;
- unsigned I = (unsigned) VT.getSimpleVT().SimpleTy;
- assert(ExtType < ISD::LAST_LOADEXT_TYPE && I < MVT::LAST_VALUETYPE &&
- "Table isn't big enough!");
- return (LegalizeAction)LoadExtActions[I][ExtType];
+ LegalizeAction getLoadExtAction(unsigned ExtType, EVT ValVT, EVT MemVT) const {
+ if (ValVT.isExtended() || MemVT.isExtended()) return Expand;
+ unsigned ValI = (unsigned) ValVT.getSimpleVT().SimpleTy;
+ unsigned MemI = (unsigned) MemVT.getSimpleVT().SimpleTy;
+ assert(ExtType < ISD::LAST_LOADEXT_TYPE && ValI < MVT::LAST_VALUETYPE &&
+ MemI < MVT::LAST_VALUETYPE && "Table isn't big enough!");
+ return (LegalizeAction)LoadExtActions[ValI][MemI][ExtType];
}
/// Return true if the specified load with extension is legal on this target.
- bool isLoadExtLegal(unsigned ExtType, EVT VT) const {
- return VT.isSimple() &&
- getLoadExtAction(ExtType, VT.getSimpleVT()) == Legal;
+ bool isLoadExtLegal(unsigned ExtType, EVT ValVT, EVT MemVT) const {
+ return ValVT.isSimple() && MemVT.isSimple() &&
+ getLoadExtAction(ExtType, ValVT, MemVT) == Legal;
}
/// Return how this store with truncation should be treated: either it is
/// sequence, or the target has a custom expander for it.
LegalizeAction
getIndexedLoadAction(unsigned IdxMode, MVT VT) const {
- assert(IdxMode < ISD::LAST_INDEXED_MODE && VT < MVT::LAST_VALUETYPE &&
+ assert(IdxMode < ISD::LAST_INDEXED_MODE && VT.isValid() &&
"Table isn't big enough!");
unsigned Ty = (unsigned)VT.SimpleTy;
return (LegalizeAction)((IndexedModeActions[Ty][IdxMode] & 0xf0) >> 4);
/// sequence, or the target has a custom expander for it.
LegalizeAction
getIndexedStoreAction(unsigned IdxMode, MVT VT) const {
- assert(IdxMode < ISD::LAST_INDEXED_MODE && VT < MVT::LAST_VALUETYPE &&
+ assert(IdxMode < ISD::LAST_INDEXED_MODE && VT.isValid() &&
"Table isn't big enough!");
unsigned Ty = (unsigned)VT.SimpleTy;
return (LegalizeAction)(IndexedModeActions[Ty][IdxMode] & 0x0f);
/// reduce runtime.
virtual bool ShouldShrinkFPConstant(EVT) const { return true; }
+ // Return true if it is profitable to reduce the given load node to a smaller
+ // type.
+ //
+ // e.g. (i16 (trunc (i32 (load x))) -> i16 load x should be performed
+ virtual bool shouldReduceLoadWidth(SDNode *Load,
+ ISD::LoadExtType ExtTy,
+ EVT NewVT) const {
+ return true;
+ }
+
/// When splitting a value of the specified type into parts, does the Lo
/// or Hi part come first? This usually follows the endianness, except
/// for ppcf128, where the Hi part always comes first.
}
/// Return the preferred loop alignment.
- unsigned getPrefLoopAlignment() const {
+ virtual unsigned getPrefLoopAlignment(MachineLoop *ML = nullptr) const {
return PrefLoopAlignment;
}
/// Indicate that the specified load with extension does not work with the
/// specified type and indicate what to do about it.
- void setLoadExtAction(unsigned ExtType, MVT VT,
+ void setLoadExtAction(unsigned ExtType, MVT ValVT, MVT MemVT,
LegalizeAction Action) {
- assert(ExtType < ISD::LAST_LOADEXT_TYPE && VT < MVT::LAST_VALUETYPE &&
- "Table isn't big enough!");
- LoadExtActions[VT.SimpleTy][ExtType] = (uint8_t)Action;
+ assert(ExtType < ISD::LAST_LOADEXT_TYPE && ValVT.isValid() &&
+ MemVT.isValid() && "Table isn't big enough!");
+ LoadExtActions[ValVT.SimpleTy][MemVT.SimpleTy][ExtType] = (uint8_t)Action;
}
/// Indicate that the specified truncating store does not work with the
/// specified type and indicate what to do about it.
void setTruncStoreAction(MVT ValVT, MVT MemVT,
LegalizeAction Action) {
- assert(ValVT < MVT::LAST_VALUETYPE && MemVT < MVT::LAST_VALUETYPE &&
- "Table isn't big enough!");
+ assert(ValVT.isValid() && MemVT.isValid() && "Table isn't big enough!");
TruncStoreActions[ValVT.SimpleTy][MemVT.SimpleTy] = (uint8_t)Action;
}
/// TargetLowering.cpp
void setIndexedLoadAction(unsigned IdxMode, MVT VT,
LegalizeAction Action) {
- assert(VT < MVT::LAST_VALUETYPE && IdxMode < ISD::LAST_INDEXED_MODE &&
+ assert(VT.isValid() && IdxMode < ISD::LAST_INDEXED_MODE &&
(unsigned)Action < 0xf && "Table isn't big enough!");
// Load action are kept in the upper half.
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] &= ~0xf0;
/// TargetLowering.cpp
void setIndexedStoreAction(unsigned IdxMode, MVT VT,
LegalizeAction Action) {
- assert(VT < MVT::LAST_VALUETYPE && IdxMode < ISD::LAST_INDEXED_MODE &&
+ assert(VT.isValid() && IdxMode < ISD::LAST_INDEXED_MODE &&
(unsigned)Action < 0xf && "Table isn't big enough!");
// Store action are kept in the lower half.
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] &= ~0x0f;
/// target and indicate what to do about it.
void setCondCodeAction(ISD::CondCode CC, MVT VT,
LegalizeAction Action) {
- assert(VT < MVT::LAST_VALUETYPE &&
- (unsigned)CC < array_lengthof(CondCodeActions) &&
+ assert(VT.isValid() && (unsigned)CC < array_lengthof(CondCodeActions) &&
"Table isn't big enough!");
/// The lower 5 bits of the SimpleTy index into Nth 2bit set from the 32-bit
/// value and the upper 27 bits index into the second dimension of the array
/// Set the target's preferred loop alignment. Default alignment is zero, it
/// means the target does not care about loop alignment. The alignment is
- /// specified in log2(bytes).
+ /// specified in log2(bytes). The target may also override
+ /// getPrefLoopAlignment to provide per-loop values.
void setPrefLoopAlignment(unsigned Align) {
PrefLoopAlignment = Align;
}
return isZExtFree(Val.getValueType(), VT2);
}
+ /// Return true if an fpext operation is free (for instance, because
+ /// single-precision floating-point numbers are implicitly extended to
+ /// double-precision).
+ virtual bool isFPExtFree(EVT VT) const {
+ assert(VT.isFloatingPoint());
+ return false;
+ }
+
/// Return true if an fneg operation is free to the point where it is never
/// worthwhile to replace it with a bitwise operation.
virtual bool isFNegFree(EVT VT) const {
Type *Ty) const {
return false;
}
+
+ /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
+ /// with this index. This is needed because EXTRACT_SUBVECTOR usually
+ /// has custom lowering that depends on the index of the first element,
+ /// and only the target knows which lowering is cheap.
+ virtual bool isExtractSubvectorCheap(EVT ResVT, unsigned Index) const {
+ return false;
+ }
+
//===--------------------------------------------------------------------===//
// Runtime Library hooks
//
/// For each load extension type and each value type, keep a LegalizeAction
/// that indicates how instruction selection should deal with a load of a
/// specific value type and extension type.
- uint8_t LoadExtActions[MVT::LAST_VALUETYPE][ISD::LAST_LOADEXT_TYPE];
+ uint8_t LoadExtActions[MVT::LAST_VALUETYPE][MVT::LAST_VALUETYPE]
+ [ISD::LAST_LOADEXT_TYPE];
/// For each value type pair keep a LegalizeAction that indicates whether a
/// truncating store of a specific value type and truncating type is legal.
/// a mask of a single bit, a compare, and a branch into a single instruction.
bool MaskAndBranchFoldingIsLegal;
+ /// \see enableExtLdPromotion.
+ bool EnableExtLdPromotion;
+
protected:
/// Return true if the value types that can be represented by the specified
/// register class are all legal.
projects / oota-llvm.git / blobdiff