-// doInitialization - Initializes the vector of functions that have not
-// been annotated with the "always inline" attribute.
-bool AlwaysInliner::doInitialization(CallGraph &CG) {
- Module &M = CG.getModule();
-
- for (Module::iterator I = M.begin(), E = M.end();
- I != E; ++I)
- if (!I->isDeclaration() && !I->hasFnAttr(Attribute::AlwaysInline))
- NeverInline.insert(I);
-
- return false;
+Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
+ return new AlwaysInliner(InsertLifetime);
+}
+
+/// \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() &&
+ CS.hasFnAttr(Attribute::AlwaysInline) && isInlineViable(*Callee))
+ return InlineCost::getAlways();
+
+ return InlineCost::getNever();