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Big diff for a small change: delete inlined functions if all callees have

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inlined the function.
Implements: Inline/inline_dce.ll

llvm-svn: 8101
This commit is contained in:
Chris Lattner 2003-08-24 05:03:14 +00:00
parent e5e5778d06
commit 5159ae0f96
1 changed files with 32 additions and 21 deletions
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53
lib/Transforms/IPO/InlineSimple.cpp
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@ -17,6 +17,7 @@
namespace {
Statistic<> NumInlined("inline", "Number of functions inlined");
Statistic<> NumDeleted("inline", "Number of functions deleted because all callers found");
cl::opt<unsigned> // FIXME: 200 is VERY conservative
InlineLimit("inline-threshold", cl::Hidden, cl::init(200),
cl::desc("Control the amount of inlining to perform (default = 200)"));
@ -139,29 +140,39 @@ bool FunctionInlining::doInlining(Function *F) {
bool ShouldInc = true;
// Found a call instruction? FIXME: This should also handle INVOKEs
if (CallInst *CI = dyn_cast<CallInst>(I)) {
if (Function *Callee = CI->getCalledFunction())
if (Function *Callee = CI->getCalledFunction()) {
doInlining(Callee); // Inline in callees before callers!
// Decide whether we should inline this function...
if (ShouldInlineFunction(CI)) {
// Save an iterator to the instruction before the call if it exists,
// otherwise get an iterator at the end of the block... because the
// call will be destroyed.
//
BasicBlock::iterator SI;
if (I != BB->begin()) {
SI = I; --SI; // Instruction before the call...
} else {
SI = BB->end();
}
// Attempt to inline the function...
if (InlineFunction(CI)) {
++NumInlined;
Changed = true;
// Move to instruction before the call...
I = (SI == BB->end()) ? BB->begin() : SI;
ShouldInc = false; // Don't increment iterator until next time
// Decide whether we should inline this function...
if (ShouldInlineFunction(CI)) {
// Save an iterator to the instruction before the call if it exists,
// otherwise get an iterator at the end of the block... because the
// call will be destroyed.
//
BasicBlock::iterator SI;
if (I != BB->begin()) {
SI = I; --SI; // Instruction before the call...
} else {
SI = BB->end();
}
// Attempt to inline the function...
if (InlineFunction(CI)) {
++NumInlined;
Changed = true;
// Move to instruction before the call...
I = (SI == BB->end()) ? BB->begin() : SI;
ShouldInc = false; // Don't increment iterator until next time
// If we inlined the last possible call site to the function,
// delete the function body now.
if (Callee->use_empty() &&
(Callee->hasInternalLinkage()||Callee->hasLinkOnceLinkage())){
F->getParent()->getFunctionList().erase(Callee);
++NumDeleted;
if (Callee == F) return true;
}
}
}
}
}