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Remove unreachable basic blocks before "linking"

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This commit is contained in:
Paweł Bylica 2014-10-21 15:55:29 +02:00
parent 8ba533fd32
commit a4416e563d
1 changed files with 20 additions and 1 deletions
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21
libevmjit/Compiler.cpp
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@ -911,7 +911,26 @@ void Compiler::linkBasicBlocks()
}
};
// Remove dead basic blocks
auto sthErased = false;
do
{
sthErased = false;
for (auto it = basicBlocks.begin(); it != basicBlocks.end();)
{
auto llvmBB = it->second.llvm();
if (llvm::pred_begin(llvmBB) == llvm::pred_end(llvmBB))
{
llvmBB->eraseFromParent();
basicBlocks.erase(it++);
sthErased = true;
}
else
++it;
}
}
while (sthErased);
// TODO: It is crappy visiting of basic blocks.
llvm::SmallPtrSet<llvm::BasicBlock*, 32> visitSet;
for (auto&& bb : basicBlocks) // TODO: External loop is to visit unreable blocks that can also have phi nodes