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More cleanups to the OptimizeEmptyGlobalCXXDtors GlobalOpt function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127997 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anders Carlsson 2011-03-21 14:54:40 +00:00
parent 3ce1b7d514
commit b12caf31f4
1 changed files with 9 additions and 15 deletions
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24
lib/Transforms/IPO/GlobalOpt.cpp
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@ -2737,18 +2737,15 @@ static bool cxxDtorIsEmpty(const Function &Fn,
for (BasicBlock::const_iterator I = EntryBlock.begin(), E = EntryBlock.end();
I != E; ++I) {
if (const CallInst *CI = dyn_cast<CallInst>(I)) {
// Ignore debug intrinsics.
if (isa<DbgInfoIntrinsic>(CI))
continue;
const Function *CalledFn = CI->getCalledFunction();
if (!CalledFn)
return false;
if (unsigned IntrinsicID = CalledFn->getIntrinsicID()) {
// Ignore debug intrinsics.
if (IntrinsicID == llvm::Intrinsic::dbg_declare ||
IntrinsicID == llvm::Intrinsic::dbg_value)
continue;
}
// Don't treat recursive functions as empty.
if (!CalledFunctions.insert(CalledFn))
return false;
@ -2783,18 +2780,15 @@ bool GlobalOpt::OptimizeEmptyGlobalCXXDtors(Function *CXAAtExitFn) {
for (Function::use_iterator I = CXAAtExitFn->use_begin(),
E = CXAAtExitFn->use_end(); I != E;) {
CallSite CS(*I++);
if (!CS)
continue;
// We're only interested in calls. Theoretically, we could handle invoke
// instructions as well, but neither llvm-gcc nor clang generate invokes
// to __cxa_atexit.
if (!CS.isCall())
CallInst *CI = dyn_cast<CallInst>(*I++);
if (!CI)
continue;
Function *DtorFn =
dyn_cast<Function>(CS.getArgument(0)->stripPointerCasts());
dyn_cast<Function>(CI->getArgOperand(0)->stripPointerCasts());
if (!DtorFn)
continue;
@ -2803,8 +2797,8 @@ bool GlobalOpt::OptimizeEmptyGlobalCXXDtors(Function *CXAAtExitFn) {
continue;
// Just remove the call.
CS->replaceAllUsesWith(Constant::getNullValue(CS.getType()));
CS->eraseFromParent();
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
CI->eraseFromParent();
++NumCXXDtorsRemoved;