// into two pieces that are both >= 0 or both <= 0.
SDLoc DL(N);
- uint64_t RemainderOffset = COffsetVal;
- uint64_t ImmField = 0;
- const unsigned NumBits = TII->getNumFlatOffsetBits(IsSigned);
- if (IsSigned) {
- // Use signed division by a power of two to truncate towards 0.
- int64_t D = 1LL << (NumBits - 1);
- RemainderOffset = (static_cast<int64_t>(COffsetVal) / D) * D;
- ImmField = COffsetVal - RemainderOffset;
- } else if (static_cast<int64_t>(COffsetVal) >= 0) {
- ImmField = COffsetVal & maskTrailingOnes<uint64_t>(NumBits);
- RemainderOffset = COffsetVal - ImmField;
- }
- assert(TII->isLegalFLATOffset(ImmField, AS, IsSigned));
- assert(RemainderOffset + ImmField == COffsetVal);
+ uint64_t RemainderOffset;
- OffsetVal = ImmField;
+ std::tie(OffsetVal, RemainderOffset)
+ = TII->splitFlatOffset(COffsetVal, AS, IsSigned);
SDValue AddOffsetLo =
getMaterializedScalarImm32(Lo_32(RemainderOffset), DL);
return Signed ? isInt<13>(Offset) :isUInt<12>(Offset);
}
+std::pair<int64_t, int64_t> SIInstrInfo::splitFlatOffset(int64_t COffsetVal,
+ unsigned AddrSpace,
+ bool IsSigned) const {
+ int64_t RemainderOffset = COffsetVal;
+ int64_t ImmField = 0;
+ const unsigned NumBits = getNumFlatOffsetBits(IsSigned);
+ if (IsSigned) {
+ // Use signed division by a power of two to truncate towards 0.
+ int64_t D = 1LL << (NumBits - 1);
+ RemainderOffset = (COffsetVal / D) * D;
+ ImmField = COffsetVal - RemainderOffset;
+ } else if (COffsetVal >= 0) {
+ ImmField = COffsetVal & maskTrailingOnes<uint64_t>(NumBits);
+ RemainderOffset = COffsetVal - ImmField;
+ }
+
+ assert(isLegalFLATOffset(ImmField, AddrSpace, IsSigned));
+ assert(RemainderOffset + ImmField == COffsetVal);
+ return {ImmField, RemainderOffset};
+}
// This must be kept in sync with the SIEncodingFamily class in SIInstrInfo.td
enum SIEncodingFamily {
bool isLegalFLATOffset(int64_t Offset, unsigned AddrSpace,
bool Signed) const;
+ /// Split \p COffsetVal into {immediate offset field, remainder offset}
+ /// values.
+ std::pair<int64_t, int64_t> splitFlatOffset(int64_t COffsetVal,
+ unsigned AddrSpace,
+ bool IsSigned) const;
+
/// \brief Return a target-specific opcode if Opcode is a pseudo instruction.
/// Return -1 if the target-specific opcode for the pseudo instruction does
/// not exist. If Opcode is not a pseudo instruction, this is identity.