//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "inline"
-#include "llvm/CallingConv.h"
-#include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Module.h"
-#include "llvm/Type.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/InlineCost.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Type.h"
#include "llvm/Support/CallSite.h"
-#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/InlinerPass.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
- // AlwaysInliner only inlines functions that are mark as "always inline".
- class AlwaysInliner : public Inliner {
- InlineCostAnalyzer CA;
- public:
- // Use extremely low threshold.
- AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/true) {
- initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
- }
- AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
- InsertLifetime) {
- initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
- }
- static char ID; // Pass identification, replacement for typeid
- InlineCost getInlineCost(CallSite CS) {
- Function *Callee = CS.getCalledFunction();
- // We assume indirect calls aren't calling an always-inline function.
- if (!Callee) return InlineCost::getNever();
-
- // We can't inline calls to external functions.
- // FIXME: We shouldn't even get here.
- if (Callee->isDeclaration()) return InlineCost::getNever();
-
- // Return never for anything not marked as always inline.
- if (!Callee->hasFnAttr(Attribute::AlwaysInline))
- return InlineCost::getNever();
-
- // We still have to check the inline cost in case there are reasons to
- // not inline which trump the always-inline attribute such as setjmp and
- // indirectbr.
- return CA.getInlineCost(CS);
- }
- float getInlineFudgeFactor(CallSite CS) {
- return CA.getInlineFudgeFactor(CS);
- }
- void resetCachedCostInfo(Function *Caller) {
- CA.resetCachedCostInfo(Caller);
- }
- void growCachedCostInfo(Function* Caller, Function* Callee) {
- CA.growCachedCostInfo(Caller, Callee);
- }
- virtual bool doFinalization(CallGraph &CG) {
- return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/true);
- }
- virtual bool doInitialization(CallGraph &CG);
- void releaseMemory() {
- CA.clear();
- }
- };
+/// \brief Inliner pass which only handles "always inline" functions.
+class AlwaysInliner : public Inliner {
+ InlineCostAnalysis *ICA;
+
+public:
+ // Use extremely low threshold.
+ AlwaysInliner() : Inliner(ID, -2000000000, /*InsertLifetime*/ true), ICA(0) {
+ initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
+ }
+
+ AlwaysInliner(bool InsertLifetime)
+ : Inliner(ID, -2000000000, InsertLifetime), ICA(0) {
+ initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
+ }
+
+ static char ID; // Pass identification, replacement for typeid
+
+ virtual InlineCost getInlineCost(CallSite CS);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+ virtual bool runOnSCC(CallGraphSCC &SCC);
+
+ using llvm::Pass::doFinalization;
+ virtual bool doFinalization(CallGraph &CG) {
+ return removeDeadFunctions(CG, /*AlwaysInlineOnly=*/ true);
+ }
+};
+
}
char AlwaysInliner::ID = 0;
INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
INITIALIZE_AG_DEPENDENCY(CallGraph)
+INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
"Inliner for always_inline functions", false, false)
return new AlwaysInliner(InsertLifetime);
}
-// doInitialization - Initializes the vector of functions that have not
-// been annotated with the "always inline" attribute.
-bool AlwaysInliner::doInitialization(CallGraph &CG) {
- CA.setTargetData(getAnalysisIfAvailable<TargetData>());
- return false;
+/// \brief Get the inline cost for the always-inliner.
+///
+/// The always inliner *only* handles functions which are marked with the
+/// attribute to force inlining. As such, it is dramatically simpler and avoids
+/// using the powerful (but expensive) inline cost analysis. Instead it uses
+/// a very simple and boring direct walk of the instructions looking for
+/// impossible-to-inline constructs.
+///
+/// Note, it would be possible to go to some lengths to cache the information
+/// computed here, but as we only expect to do this for relatively few and
+/// small functions which have the explicit attribute to force inlining, it is
+/// likely not worth it in practice.
+InlineCost AlwaysInliner::getInlineCost(CallSite CS) {
+ Function *Callee = CS.getCalledFunction();
+
+ // Only inline direct calls to functions with always-inline attributes
+ // that are viable for inlining. FIXME: We shouldn't even get here for
+ // declarations.
+ if (Callee && !Callee->isDeclaration() &&
+ Callee->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::AlwaysInline) &&
+ ICA->isInlineViable(*Callee))
+ return InlineCost::getAlways();
+
+ return InlineCost::getNever();
+}
+
+bool AlwaysInliner::runOnSCC(CallGraphSCC &SCC) {
+ ICA = &getAnalysis<InlineCostAnalysis>();
+ return Inliner::runOnSCC(SCC);
+}
+
+void AlwaysInliner::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<InlineCostAnalysis>();
+ Inliner::getAnalysisUsage(AU);
}