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Implement new DeadInstElmination pass

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1555 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-01-23 05:48:24 +00:00
parent a16c3efb9f
commit c560f88e91
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/Scalar/DCE.cpp
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@ -3,7 +3,7 @@
// This file implements dead code elimination and basic block merging. // This file implements dead code elimination and basic block merging.
// //
// Specifically, this: // Specifically, this:
// * removes definitions with no uses (including unused constants) // * removes definitions with no uses
// * removes basic blocks with no predecessors // * removes basic blocks with no predecessors
// * merges a basic block into its predecessor if there is only one and the // * merges a basic block into its predecessor if there is only one and the
// predecessor only has one successor. // predecessor only has one successor.
@ -61,6 +61,10 @@ static inline bool RemoveUnusedDefs(BasicBlock::InstListType &Vals) {
return Changed; return Changed;
} }
bool DeadInstElimination::runOnBasicBlock(BasicBlock *BB) {
return RemoveUnusedDefs(BB->getInstList());
}
// RemoveSingularPHIs - This removes PHI nodes from basic blocks that have only // RemoveSingularPHIs - This removes PHI nodes from basic blocks that have only
// a single predecessor. This means that the PHI node must only have a single // a single predecessor. This means that the PHI node must only have a single
// RHS value and can be eliminated. // RHS value and can be eliminated.