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[block-freq] Teach branch probability how to return the edge weight in between a BasicBlock and one of its successors.

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IMHO At some point BasicBlock should be refactored along the lines of
MachineBasicBlock so that successors/weights are actually embedded within the
block. Now is not that time though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197303 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-12-14 02:24:25 +00:00
parent 1b98ef1c19
commit b68ca3e9c5
2 changed files with 14 additions and 0 deletions
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4
include/llvm/Analysis/BranchProbabilityInfo.h
View File

@ -16,6 +16,7 @@
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/CFG.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/BranchProbability.h"
@ -98,6 +99,9 @@ public:
/// It is guaranteed to fall between 1 and UINT32_MAX.
uint32_t getEdgeWeight(const BasicBlock *Src, const BasicBlock *Dst) const;
uint32_t getEdgeWeight(const BasicBlock *Src,
succ_const_iterator Dst) const;
/// \brief Set the raw edge weight for a given edge.
///
/// This allows a pass to explicitly set the edge weight for an edge. It can

10
lib/Analysis/BranchProbabilityInfo.cpp
View File

@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "branch-prob"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/Analysis/LoopInfo.h"
@ -483,6 +484,8 @@ void BranchProbabilityInfo::getAnalysisUsage(AnalysisUsage &AU) const {
}
bool BranchProbabilityInfo::runOnFunction(Function &F) {
DEBUG(dbgs() << "---- Branch Probability Info : " << F.getName()
<< " ----\n\n");
LastF = &F; // Store the last function we ran on for printing.
LI = &getAnalysis<LoopInfo>();
assert(PostDominatedByUnreachable.empty());
@ -591,6 +594,13 @@ getEdgeWeight(const BasicBlock *Src, unsigned IndexInSuccessors) const {
return DEFAULT_WEIGHT;
}
uint32_t
BranchProbabilityInfo::
getEdgeWeight(const BasicBlock *Src, succ_const_iterator Dst) const {
size_t index = std::distance(succ_begin(Src), Dst);
return getEdgeWeight(Src, index);
}
/// Get the raw edge weight calculated for the block pair. This returns the sum
/// of all raw edge weights from Src to Dst.
uint32_t BranchProbabilityInfo::