- typedef MachineBasicBlock::iterator Iter;
-
- // Represents positional information about a basic block.
- struct MBBInfo {
- // The address that we currently assume the block has.
- uint64_t Address;
-
- // The size of the block in bytes, excluding terminators.
- // This value never changes.
- uint64_t Size;
-
- // The minimum alignment of the block, as a log2 value.
- // This value never changes.
- unsigned Alignment;
-
- // The number of terminators in this block. This value never changes.
- unsigned NumTerminators;
-
- MBBInfo()
- : Address(0), Size(0), Alignment(0), NumTerminators(0) {}
- };
-
- // Represents the state of a block terminator.
- struct TerminatorInfo {
- // If this terminator is a relaxable branch, this points to the branch
- // instruction, otherwise it is null.
- MachineInstr *Branch;
-
- // The address that we currently assume the terminator has.
- uint64_t Address;
-
- // The current size of the terminator in bytes.
- uint64_t Size;
-
- // If Branch is nonnull, this is the number of the target block,
- // otherwise it is unused.
- unsigned TargetBlock;
-
- // If Branch is nonnull, this is the length of the longest relaxed form,
- // otherwise it is zero.
- unsigned ExtraRelaxSize;
-
- TerminatorInfo() : Branch(0), Size(0), TargetBlock(0), ExtraRelaxSize(0) {}
- };
-
- // Used to keep track of the current position while iterating over the blocks.
- struct BlockPosition {
- // The address that we assume this position has.
- uint64_t Address;
-
- // The number of low bits in Address that are known to be the same
- // as the runtime address.
- unsigned KnownBits;
-
- BlockPosition(unsigned InitialAlignment)
- : Address(0), KnownBits(InitialAlignment) {}
- };
-
- class SystemZLongBranch : public MachineFunctionPass {
- public:
- static char ID;
- SystemZLongBranch(const SystemZTargetMachine &tm)
- : MachineFunctionPass(ID),
- TII(static_cast<const SystemZInstrInfo *>(tm.getInstrInfo())) {}
-
- virtual const char *getPassName() const {
- return "SystemZ Long Branch";
- }
-
- bool runOnMachineFunction(MachineFunction &F);
-
- private:
- void skipNonTerminators(BlockPosition &Position, MBBInfo &Block);
- void skipTerminator(BlockPosition &Position, TerminatorInfo &Terminator,
- bool AssumeRelaxed);
- TerminatorInfo describeTerminator(MachineInstr *MI);
- uint64_t initMBBInfo();
- bool mustRelaxBranch(const TerminatorInfo &Terminator, uint64_t Address);
- bool mustRelaxABranch();
- void setWorstCaseAddresses();
- void relaxBranch(TerminatorInfo &Terminator);
- void relaxBranches();
-
- const SystemZInstrInfo *TII;
- MachineFunction *MF;
- SmallVector<MBBInfo, 16> MBBs;
- SmallVector<TerminatorInfo, 16> Terminators;
- };
-
- char SystemZLongBranch::ID = 0;
+// Represents positional information about a basic block.
+struct MBBInfo {
+ // The address that we currently assume the block has.
+ uint64_t Address;
+
+ // The size of the block in bytes, excluding terminators.
+ // This value never changes.
+ uint64_t Size;
+
+ // The minimum alignment of the block, as a log2 value.
+ // This value never changes.
+ unsigned Alignment;
+
+ // The number of terminators in this block. This value never changes.
+ unsigned NumTerminators;
+
+ MBBInfo()
+ : Address(0), Size(0), Alignment(0), NumTerminators(0) {}
+};
+
+// Represents the state of a block terminator.
+struct TerminatorInfo {
+ // If this terminator is a relaxable branch, this points to the branch
+ // instruction, otherwise it is null.
+ MachineInstr *Branch;
+
+ // The address that we currently assume the terminator has.
+ uint64_t Address;
+
+ // The current size of the terminator in bytes.
+ uint64_t Size;
+
+ // If Branch is nonnull, this is the number of the target block,
+ // otherwise it is unused.
+ unsigned TargetBlock;
+
+ // If Branch is nonnull, this is the length of the longest relaxed form,
+ // otherwise it is zero.
+ unsigned ExtraRelaxSize;
+
+ TerminatorInfo() : Branch(nullptr), Size(0), TargetBlock(0),
+ ExtraRelaxSize(0) {}
+};
+
+// Used to keep track of the current position while iterating over the blocks.
+struct BlockPosition {
+ // The address that we assume this position has.
+ uint64_t Address;
+
+ // The number of low bits in Address that are known to be the same
+ // as the runtime address.
+ unsigned KnownBits;
+
+ BlockPosition(unsigned InitialAlignment)
+ : Address(0), KnownBits(InitialAlignment) {}
+};
+
+class SystemZLongBranch : public MachineFunctionPass {
+public:
+ static char ID;
+ SystemZLongBranch(const SystemZTargetMachine &tm)
+ : MachineFunctionPass(ID), TII(nullptr) {}
+
+ const char *getPassName() const override {
+ return "SystemZ Long Branch";
+ }