#include "llvm/Pass.h"
#include "llvm/Support/BranchProbability.h"
#include <climits>
+#include <numeric>
namespace llvm {
uint32_t getEdgeWeight(const MachineBasicBlock *Src,
MachineBasicBlock::const_succ_iterator Dst) const;
- // Get sum of the block successors' weights, potentially scaling them to fit
- // within 32-bits. If scaling is required, sets Scale based on the necessary
- // adjustment. Any edge weights used with the sum should be divided by Scale.
- uint32_t getSumForBlock(const MachineBasicBlock *MBB, uint32_t &Scale) const;
+ // Return edge probability.
+ BranchProbability getEdgeProbability(const MachineBasicBlock *Src,
+ const MachineBasicBlock *Dst) const;
+
+ // Same as above, but using a const_succ_iterator from Src. This is faster
+ // when the iterator is already available.
+ BranchProbability
+ getEdgeProbability(const MachineBasicBlock *Src,
+ MachineBasicBlock::const_succ_iterator Dst) const;
// A 'Hot' edge is an edge which probability is >= 80%.
- bool isEdgeHot(MachineBasicBlock *Src, MachineBasicBlock *Dst) const;
+ bool isEdgeHot(const MachineBasicBlock *Src,
+ const MachineBasicBlock *Dst) const;
// Return a hot successor for the block BB or null if there isn't one.
// NB: This routine's complexity is linear on the number of successors.
MachineBasicBlock *getHotSucc(MachineBasicBlock *MBB) const;
- // Return a probability as a fraction between 0 (0% probability) and
- // 1 (100% probability), however the value is never equal to 0, and can be 1
- // only iff SRC block has only one successor.
- // NB: This routine's complexity is linear on the number of successors of
- // Src. Querying sequentially for each successor's probability is a quadratic
- // query pattern.
- BranchProbability getEdgeProbability(MachineBasicBlock *Src,
- MachineBasicBlock *Dst) const;
-
// Print value between 0 (0% probability) and 1 (100% probability),
// however the value is never equal to 0, and can be 1 only iff SRC block
// has only one successor.
- raw_ostream &printEdgeProbability(raw_ostream &OS, MachineBasicBlock *Src,
- MachineBasicBlock *Dst) const;
+ raw_ostream &printEdgeProbability(raw_ostream &OS,
+ const MachineBasicBlock *Src,
+ const MachineBasicBlock *Dst) const;
};
}