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Hack to workaround a clang lto bug #6782

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Merged
merged 1 commit into from
Jan 13, 2017
Merged

Hack to workaround a clang lto bug #6782

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10 changes: 8 additions & 2 deletions lib/IRGen/AllocStackHoisting.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,13 @@ insertDeallocStackAtEndOf(SmallVectorImpl<SILInstruction *> &FunctionExits,
}
}

/// Hack to workaround a clang LTO bug.
__attribute__((noinline))
void moveAllocStackToBeginningOfBlock(AllocStackInst* AS, SILBasicBlock *BB) {
AS->removeFromParent();
BB->push_front(AS);
}

/// Assign a single alloc_stack instruction to all the alloc_stacks in the
/// partition.
void Partition::assignStackLocation(
Expand All @@ -120,8 +127,7 @@ void Partition::assignStackLocation(

// Move this assigned location to the beginning of the entry block.
auto *EntryBB = AssignedLoc->getFunction()->getEntryBlock();
AssignedLoc->removeFromParent();
EntryBB->push_front(AssignedLoc);
moveAllocStackToBeginningOfBlock(AssignedLoc, EntryBB);

// Erase the dealloc_stacks.
eraseDeallocStacks(AssignedLoc);
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