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authorJakub Staszak <jstaszak@apple.com>2011-07-25 19:25:40 +0000
committerJakub Staszak <jstaszak@apple.com>2011-07-25 19:25:40 +0000
commitf55c1c85881afd65647bde5346f64d9685235c7c (patch)
tree0ae5ec50f539ceede3fd40c643010095dcfa9464 /lib/Analysis/BlockFrequencyInfo.cpp
parent8c3fee59038d8fd98db2a01b6a309a8941a16a3f (diff)
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Rename BlockFrequency to BlockFrequencyInfo and MachineBlockFrequency to
MachineBlockFrequencyInfo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135937 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/BlockFrequencyInfo.cpp')
-rw-r--r--lib/Analysis/BlockFrequencyInfo.cpp59
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/Analysis/BlockFrequencyInfo.cpp b/lib/Analysis/BlockFrequencyInfo.cpp
new file mode 100644
index 0000000000..b93e9a6aa9
--- /dev/null
+++ b/lib/Analysis/BlockFrequencyInfo.cpp
@@ -0,0 +1,59 @@
+//=======-------- BlockFrequencyInfo.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/BlockFrequencyInfo.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/BranchProbabilityInfo.h"
+
+using namespace llvm;
+
+INITIALIZE_PASS_BEGIN(BlockFrequencyInfo, "block-freq", "Block Frequency Analysis",
+ true, true)
+INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
+INITIALIZE_PASS_END(BlockFrequencyInfo, "block-freq", "Block Frequency Analysis",
+ true, true)
+
+char BlockFrequencyInfo::ID = 0;
+
+
+BlockFrequencyInfo::BlockFrequencyInfo() : FunctionPass(ID) {
+ initializeBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
+ BFI = new BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo>();
+}
+
+BlockFrequencyInfo::~BlockFrequencyInfo() {
+ delete BFI;
+}
+
+void BlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<BranchProbabilityInfo>();
+ AU.setPreservesAll();
+}
+
+bool BlockFrequencyInfo::runOnFunction(Function &F) {
+ BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
+ BFI->doFunction(&F, &BPI);
+ return false;
+}
+
+/// getblockFreq - Return block frequency. Return 0 if we don't have the
+/// information. 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 BlockFrequencyInfo::getBlockFreq(BasicBlock *BB) {
+ return BFI->getBlockFreq(BB);
+}