diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/GCSE.cpp | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/llvm/lib/Transforms/Scalar/GCSE.cpp b/llvm/lib/Transforms/Scalar/GCSE.cpp index 771b9690fad..dd8e139efda 100644 --- a/llvm/lib/Transforms/Scalar/GCSE.cpp +++ b/llvm/lib/Transforms/Scalar/GCSE.cpp @@ -25,9 +25,6 @@ namespace { class GCSE : public FunctionPass { std::set<Instruction*> WorkList; DominatorSet *DomSetInfo; -#if 0 - ImmediateDominators *ImmDominator; -#endif ValueNumbering *VN; public: virtual bool runOnFunction(Function &F); @@ -61,9 +58,6 @@ bool GCSE::runOnFunction(Function &F) { // Get pointers to the analysis results that we will be using... DomSetInfo = &getAnalysis<DominatorSet>(); -#if 0 - ImmDominator = &getAnalysis<ImmediateDominators>(); -#endif VN = &getAnalysis<ValueNumbering>(); // Step #1: Add all instructions in the function to the worklist for @@ -254,32 +248,6 @@ Instruction *GCSE::EliminateCSE(Instruction *I, Instruction *Other) { // PRE than GCSE. // return 0; - -#if 0 - // Handle the most general case now. In this case, neither I dom Other nor - // Other dom I. Because we are in SSA form, we are guaranteed that the - // operands of the two instructions both dominate the uses, so we _know_ - // that there must exist a block that dominates both instructions (if the - // operands of the instructions are globals or constants, worst case we - // would get the entry node of the function). Search for this block now. - // - - // Search up the immediate dominator chain of BB1 for the shared dominator - BasicBlock *SharedDom = (*ImmDominator)[BB1]; - while (!DomSetInfo->dominates(SharedDom, BB2)) - SharedDom = (*ImmDominator)[SharedDom]; - - // At this point, shared dom must dominate BOTH BB1 and BB2... - assert(SharedDom && DomSetInfo->dominates(SharedDom, BB1) && - DomSetInfo->dominates(SharedDom, BB2) && "Dominators broken!"); - - // Rip 'I' out of BB1, and move it to the end of SharedDom. - BB1->getInstList().remove(I); - SharedDom->getInstList().insert(--SharedDom->end(), I); - - // Eliminate 'Other' now. - ReplaceInstWithInst(I, Other); -#endif } if (isa<LoadInst>(Ret)) |
