Convert optimizations to the pass infrastructure
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@873 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/DCE.cpp b/lib/Transforms/Scalar/DCE.cpp
index 10dcf1e..e089525 100644
--- a/lib/Transforms/Scalar/DCE.cpp
+++ b/lib/Transforms/Scalar/DCE.cpp
@@ -26,6 +26,7 @@
#include "llvm/Optimizations/DCE.h"
#include "llvm/Support/STLExtras.h"
#include "llvm/Module.h"
+#include "llvm/GlobalVariable.h"
#include "llvm/Method.h"
#include "llvm/BasicBlock.h"
#include "llvm/iTerminators.h"
@@ -293,28 +294,40 @@
// It is possible that we may require multiple passes over the code to fully
// eliminate dead code. Iterate until we are done.
//
-bool opt::DoDeadCodeElimination(Method *M) {
+bool opt::DeadCodeElimination::doDCE(Method *M) {
bool Changed = false;
while (DoDCEPass(M)) Changed = true;
return Changed;
}
-bool opt::DoDeadCodeElimination(Module *Mod) {
+bool opt::DeadCodeElimination::RemoveUnusedGlobalValues(Module *Mod) {
bool Changed = false;
for (Module::iterator MI = Mod->begin(); MI != Mod->end(); ) {
Method *Meth = *MI;
- if (!Meth->isExternal()) { // DCE normal methods
- Changed |= DoDeadCodeElimination(Meth);
- ++MI; // Next method please
- } else if (Meth->use_size() == 0) { // No references to prototype?
+ if (Meth->isExternal() && Meth->use_size() == 0) {
+ // No references to prototype?
//cerr << "Removing method proto: " << Meth->getName() << endl;
delete Mod->getMethodList().remove(MI); // Remove prototype
// Remove moves iterator to point to the next one automatically
+ Changed = true;
} else {
++MI; // Skip prototype in use.
}
}
+ for (Module::giterator GI = Mod->gbegin(); GI != Mod->gend(); ) {
+ GlobalVariable *GV = *GI;
+ if (!GV->hasInitializer() && GV->use_size() == 0) {
+ // No references to uninitialized global variable?
+ //cerr << "Removing global var: " << GV->getName() << endl;
+ delete Mod->getGlobalList().remove(GI);
+ // Remove moves iterator to point to the next one automatically
+ Changed = true;
+ } else {
+ ++GI;
+ }
+ }
+
return Changed;
}