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in addition to merging, constantmerge should also delete trivially dead globals, 

in order to clean up after simplifylibcalls.

llvm-svn: 35982
This commit is contained in:
Chris Lattner 2007-04-14 01:11:54 +00:00
parent efb33d28c6
commit 02137eec8f
1 changed files with 8 additions and 1 deletions
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9
llvm/lib/Transforms/IPO/ConstantMerge.cpp
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@ -61,7 +61,13 @@ bool ConstantMerge::runOnModule(Module &M) {
// invalidating the Constant* pointers in CMap.
//
for (Module::global_iterator GV = M.global_begin(), E = M.global_end();
GV != E; ++GV)
GV != E; ++GV) {
// If this GV is dead, remove it.
GV->removeDeadConstantUsers();
if (GV->use_empty() && GV->hasInternalLinkage()) {
(GV++)->eraseFromParent();
}
// Only process constants with initializers.
if (GV->isConstant() && GV->hasInitializer()) {
Constant *Init = GV->getInitializer();
@ -80,6 +86,7 @@ bool ConstantMerge::runOnModule(Module &M) {
Slot = GV;
}
}
}
if (Replacements.empty())
return MadeChange;