mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
cd52a7a381
Apparently, the style needs to be agreed upon first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240390 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements various weight measurements for code, helping
|
|
// the Inliner and other passes decide whether to duplicate its contents.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_CODEMETRICS_H
|
|
#define LLVM_ANALYSIS_CODEMETRICS_H
|
|
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/IR/CallSite.h"
|
|
|
|
namespace llvm {
|
|
class AssumptionCache;
|
|
class BasicBlock;
|
|
class Loop;
|
|
class Function;
|
|
class Instruction;
|
|
class DataLayout;
|
|
class TargetTransformInfo;
|
|
class Value;
|
|
|
|
/// \brief Check whether a call will lower to something small.
|
|
///
|
|
/// This tests checks whether this callsite will lower to something
|
|
/// significantly cheaper than a traditional call, often a single
|
|
/// instruction. Note that if isInstructionFree(CS.getInstruction()) would
|
|
/// return true, so will this function.
|
|
bool callIsSmall(ImmutableCallSite CS);
|
|
|
|
/// \brief Utility to calculate the size and a few similar metrics for a set
|
|
/// of basic blocks.
|
|
struct CodeMetrics {
|
|
/// \brief True if this function contains a call to setjmp or other functions
|
|
/// with attribute "returns twice" without having the attribute itself.
|
|
bool exposesReturnsTwice;
|
|
|
|
/// \brief True if this function calls itself.
|
|
bool isRecursive;
|
|
|
|
/// \brief True if this function cannot be duplicated.
|
|
///
|
|
/// True if this function contains one or more indirect branches, or it contains
|
|
/// one or more 'noduplicate' instructions.
|
|
bool notDuplicatable;
|
|
|
|
/// \brief True if this function calls alloca (in the C sense).
|
|
bool usesDynamicAlloca;
|
|
|
|
/// \brief Number of instructions in the analyzed blocks.
|
|
unsigned NumInsts;
|
|
|
|
/// \brief Number of analyzed blocks.
|
|
unsigned NumBlocks;
|
|
|
|
/// \brief Keeps track of basic block code size estimates.
|
|
DenseMap<const BasicBlock *, unsigned> NumBBInsts;
|
|
|
|
/// \brief Keep track of the number of calls to 'big' functions.
|
|
unsigned NumCalls;
|
|
|
|
/// \brief The number of calls to internal functions with a single caller.
|
|
///
|
|
/// These are likely targets for future inlining, likely exposed by
|
|
/// interleaved devirtualization.
|
|
unsigned NumInlineCandidates;
|
|
|
|
/// \brief How many instructions produce vector values.
|
|
///
|
|
/// The inliner is more aggressive with inlining vector kernels.
|
|
unsigned NumVectorInsts;
|
|
|
|
/// \brief How many 'ret' instructions the blocks contain.
|
|
unsigned NumRets;
|
|
|
|
CodeMetrics()
|
|
: exposesReturnsTwice(false), isRecursive(false), notDuplicatable(false),
|
|
usesDynamicAlloca(false), NumInsts(0), NumBlocks(0), NumCalls(0),
|
|
NumInlineCandidates(0), NumVectorInsts(0), NumRets(0) {}
|
|
|
|
/// \brief Add information about a block to the current state.
|
|
void analyzeBasicBlock(const BasicBlock *BB, const TargetTransformInfo &TTI,
|
|
SmallPtrSetImpl<const Value*> &EphValues);
|
|
|
|
/// \brief Collect a loop's ephemeral values (those used only by an assume
|
|
/// or similar intrinsics in the loop).
|
|
static void collectEphemeralValues(const Loop *L, AssumptionCache *AC,
|
|
SmallPtrSetImpl<const Value *> &EphValues);
|
|
|
|
/// \brief Collect a functions's ephemeral values (those used only by an
|
|
/// assume or similar intrinsics in the function).
|
|
static void collectEphemeralValues(const Function *L, AssumptionCache *AC,
|
|
SmallPtrSetImpl<const Value *> &EphValues);
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|