forked from OSchip/llvm-project
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
|
//=======-------- BlockFrequency.cpp - Block Frequency Analysis -------=======//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// Loops should be simplified before this analysis.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "llvm/InitializePasses.h"
|
||
|
|
#include "llvm/Analysis/BlockFrequencyImpl.h"
|
||
|
|
#include "llvm/Analysis/BlockFrequency.h"
|
||
|
|
#include "llvm/Analysis/LoopInfo.h"
|
||
|
|
#include "llvm/Analysis/Passes.h"
|
||
|
|
#include "llvm/Analysis/BranchProbabilityInfo.h"
|
||
|
|
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
INITIALIZE_PASS_BEGIN(BlockFrequency, "block-freq", "Block Frequency Analysis",
|
||
|
|
true, true)
|
||
|
|
INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
|
||
|
|
INITIALIZE_PASS_END(BlockFrequency, "block-freq", "Block Frequency Analysis",
|
||
|
|
true, true)
|
||
|
|
|
||
|
|
char BlockFrequency::ID = 0;
|
||
|
|
|
||
|
|
|
||
|
|
BlockFrequency::BlockFrequency() : FunctionPass(ID) {
|
||
|
|
initializeBlockFrequencyPass(*PassRegistry::getPassRegistry());
|
||
|
|
BFI = new BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo>();
|
||
|
|
}
|
||
|
|
|
||
|
|
BlockFrequency::~BlockFrequency() {
|
||
|
|
delete BFI;
|
||
|
|
}
|
||
|
|
|
||
|
|
void BlockFrequency::getAnalysisUsage(AnalysisUsage &AU) const {
|
||
|
|
AU.addRequired<BranchProbabilityInfo>();
|
||
|
|
AU.setPreservesAll();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool BlockFrequency::runOnFunction(Function &F) {
|
||
|
|
BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
|
||
|
|
BFI->doFunction(&F, &BPI);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// getblockFreq - Return block frequency. Never return 0, value must be
|
||
|
|
/// positive. Please note that initial frequency is equal to 1024. It means that
|
||
|
|
/// we should not rely on the value itself, but only on the comparison to the
|
||
|
|
/// other block frequencies. We do this to avoid using of floating points.
|
||
|
|
///
|
||
|
|
uint32_t BlockFrequency::getBlockFreq(BasicBlock *BB) {
|
||
|
|
return BFI->getBlockFreq(BB);
|
||
|
|
}
|