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4c1f3c24db
into their new header subdirectory: include/llvm/IR. This matches the directory structure of lib, and begins to correct a long standing point of file layout clutter in LLVM. There are still more header files to move here, but I wanted to handle them in separate commits to make tracking what files make sense at each layer easier. The only really questionable files here are the target intrinsic tablegen files. But that's a battle I'd rather not fight today. I've updated both CMake and Makefile build systems (I think, and my tests think, but I may have missed something). I've also re-sorted the includes throughout the project. I'll be committing updates to Clang, DragonEgg, and Polly momentarily. llvm-svn: 171366
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
//===- InlineAlways.cpp - Code to inline always_inline functions ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a custom inliner that handles only functions that
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// are marked as "always inline".
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "inline"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/InlineCost.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Transforms/IPO/InlinerPass.h"
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using namespace llvm;
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namespace {
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// AlwaysInliner only inlines functions that are mark as "always inline".
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class AlwaysInliner : public Inliner {
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InlineCostAnalyzer CA;
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public:
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// Use extremely low threshold.
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AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/true) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
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InsertLifetime) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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static char ID; // Pass identification, replacement for typeid
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virtual InlineCost getInlineCost(CallSite CS);
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using llvm::Pass::doInitialization;
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using llvm::Pass::doFinalization;
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virtual bool doFinalization(CallGraph &CG) {
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return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/true);
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}
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virtual bool doInitialization(CallGraph &CG);
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};
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}
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char AlwaysInliner::ID = 0;
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INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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INITIALIZE_AG_DEPENDENCY(CallGraph)
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INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
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Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
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return new AlwaysInliner(InsertLifetime);
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}
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/// \brief Get the inline cost for the always-inliner.
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///
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/// The always inliner *only* handles functions which are marked with the
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/// attribute to force inlining. As such, it is dramatically simpler and avoids
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/// using the powerful (but expensive) inline cost analysis. Instead it uses
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/// a very simple and boring direct walk of the instructions looking for
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/// impossible-to-inline constructs.
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///
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/// Note, it would be possible to go to some lengths to cache the information
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/// computed here, but as we only expect to do this for relatively few and
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/// small functions which have the explicit attribute to force inlining, it is
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/// likely not worth it in practice.
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InlineCost AlwaysInliner::getInlineCost(CallSite CS) {
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Function *Callee = CS.getCalledFunction();
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// Only inline direct calls to functions with always-inline attributes
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// that are viable for inlining. FIXME: We shouldn't even get here for
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// declarations.
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if (Callee && !Callee->isDeclaration() &&
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Callee->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
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Attribute::AlwaysInline) &&
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CA.isInlineViable(*Callee))
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return InlineCost::getAlways();
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return InlineCost::getNever();
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}
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// doInitialization - Initializes the vector of functions that have not
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// been annotated with the "always inline" attribute.
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bool AlwaysInliner::doInitialization(CallGraph &CG) {
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CA.setDataLayout(getAnalysisIfAvailable<DataLayout>());
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return false;
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}
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