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Make GVN iterative.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41078 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2007-08-14 18:04:11 +00:00
parent 8e8278e7fe
commit 3e75a42ee2
1 changed files with 16 additions and 1 deletions
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17
lib/Transforms/Scalar/GVN.cpp
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@@ -671,6 +671,7 @@ namespace {
DenseMap<BasicBlock*, Value*> &Phis, DenseMap<BasicBlock*, Value*> &Phis,
bool top_level = false); bool top_level = false);
void dump(DenseMap<BasicBlock*, Value*>& d); void dump(DenseMap<BasicBlock*, Value*>& d);
bool iterateOnFunction(Function &F);
}; };
char GVN::ID = 0; char GVN::ID = 0;
@@ -944,7 +945,21 @@ bool GVN::processInstruction(Instruction* I,
// GVN::runOnFunction - This is the main transformation entry point for a // GVN::runOnFunction - This is the main transformation entry point for a
// function. // function.
// //
bool GVN::runOnFunction(Function &F) { bool GVN::runOnFunction(Function& F) {
bool changed = false;
bool shouldContinue = true;
while (shouldContinue) {
shouldContinue = iterateOnFunction(F);
changed |= shouldContinue;
}
return changed;
}
// GVN::iterateOnFunction - Executes one iteration of GVN
bool GVN::iterateOnFunction(Function &F) {
// Clean out global sets from any previous functions // Clean out global sets from any previous functions
VN.clear(); VN.clear();
availableOut.clear(); availableOut.clear();