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Make MemoryBuiltins aware of TargetLibraryInfo.

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This disables malloc-specific optimization when -fno-builtin (or -ffreestanding)
is specified. This has been a problem for a long time but became more severe
with the recent memory builtin improvements.

Since the memory builtin functions are used everywhere, this required passing
TLI in many places. This means that functions that now have an optional TLI
argument, like RecursivelyDeleteTriviallyDeadFunctions, won't remove dead
mallocs anymore if the TLI argument is missing. I've updated most passes to do
the right thing.

Fixes PR13694 and probably others.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162841 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-08-29 15:32:21 +00:00
parent fd49821c35
commit 8e0d1c03ca
31 changed files with 361 additions and 184 deletions
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4
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -94,7 +94,7 @@ void llvm::FoldSingleEntryPHINodes(BasicBlock *BB, Pass *P) {
/// is dead. Also recursively delete any operands that become dead as
/// a result. This includes tracing the def-use list from the PHI to see if
/// it is ultimately unused or if it reaches an unused cycle.
bool llvm::DeleteDeadPHIs(BasicBlock *BB) {
bool llvm::DeleteDeadPHIs(BasicBlock *BB, const TargetLibraryInfo *TLI) {
// Recursively deleting a PHI may cause multiple PHIs to be deleted
// or RAUW'd undef, so use an array of WeakVH for the PHIs to delete.
SmallVector<WeakVH, 8> PHIs;
@ -105,7 +105,7 @@ bool llvm::DeleteDeadPHIs(BasicBlock *BB) {
bool Changed = false;
for (unsigned i = 0, e = PHIs.size(); i != e; ++i)
if (PHINode *PN = dyn_cast_or_null<PHINode>(PHIs[i].operator Value*()))
Changed |= RecursivelyDeleteDeadPHINode(PN);
Changed |= RecursivelyDeleteDeadPHINode(PN, TLI);
return Changed;
}