From e234a30a282f1aaec4aa63460fe8bba6416832a8 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 12 Jan 2010 19:40:54 +0000 Subject: add a helper function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93251 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Utils/Local.cpp | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'lib/Transforms/Utils/Local.cpp') diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp index 1a7d27a..90e929e 100644 --- a/lib/Transforms/Utils/Local.cpp +++ b/lib/Transforms/Utils/Local.cpp @@ -335,6 +335,30 @@ llvm::RecursivelyDeleteDeadPHINode(PHINode *PN) { return Changed; } +/// SimplifyInstructionsInBlock - Scan the specified basic block and try to +/// simplify any instructions in it and recursively delete dead instructions. +/// +/// This returns true if it changed the code, note that it can delete +/// instructions in other blocks as well in this block. +bool llvm::SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD) { + bool MadeChange = false; + for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) { + Instruction *Inst = BI++; + + if (Value *V = SimplifyInstruction(Inst, TD)) { + WeakVH BIHandle(BI); + ReplaceAndSimplifyAllUses(Inst, V, TD); + MadeChange = true; + if (BIHandle == 0) + BI = BB->begin(); + continue; + } + + MadeChange |= RecursivelyDeleteTriviallyDeadInstructions(Inst); + } + return MadeChange; +} + //===----------------------------------------------------------------------===// // Control Flow Graph Restructuring. // -- cgit v1.1