diff options
Diffstat (limited to 'contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp')
| -rw-r--r-- | contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp b/contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp index dc99492..201f320 100644 --- a/contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp +++ b/contrib/llvm/lib/Transforms/IPO/GlobalDCE.cpp @@ -42,6 +42,7 @@ namespace { private: SmallPtrSet<GlobalValue*, 32> AliveGlobals; + SmallPtrSet<Constant *, 8> SeenConstants; /// GlobalIsNeeded - mark the specific global value as needed, and /// recursively mark anything that it uses as also needed. @@ -151,6 +152,7 @@ bool GlobalDCE::runOnModule(Module &M) { // Make sure that all memory is released AliveGlobals.clear(); + SeenConstants.clear(); return Changed; } @@ -190,12 +192,15 @@ void GlobalDCE::GlobalIsNeeded(GlobalValue *G) { void GlobalDCE::MarkUsedGlobalsAsNeeded(Constant *C) { if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) return GlobalIsNeeded(GV); - + // Loop over all of the operands of the constant, adding any globals they // use to the list of needed globals. - for (User::op_iterator I = C->op_begin(), E = C->op_end(); I != E; ++I) - if (Constant *OpC = dyn_cast<Constant>(*I)) - MarkUsedGlobalsAsNeeded(OpC); + for (User::op_iterator I = C->op_begin(), E = C->op_end(); I != E; ++I) { + // If we've already processed this constant there's no need to do it again. + Constant *Op = dyn_cast<Constant>(*I); + if (Op && SeenConstants.insert(Op)) + MarkUsedGlobalsAsNeeded(Op); + } } // RemoveUnusedGlobalValue - Loop over all of the uses of the specified |
