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add a helper function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93251 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-12 19:40:54 +00:00
parent d77fdba573
commit e234a30a28
2 changed files with 32 additions and 0 deletions
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8
include/llvm/Transforms/Utils/Local.h
View File

@ -74,6 +74,14 @@ bool RecursivelyDeleteTriviallyDeadInstructions(Value *V);
/// too, recursively. Return true if the PHI node is actually deleted.
bool RecursivelyDeleteDeadPHINode(PHINode *PN);
/// 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 SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD = 0);
//===----------------------------------------------------------------------===//
// Control Flow Graph Restructuring.
//

24
lib/Transforms/Utils/Local.cpp
View File

@ -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.
//