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Avoid doing pointless work. Amazingly, this makes us go faster.

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Running the inliner on 252.eon used to take 48.4763s, now it takes 14.4148s.

In release mode, it went from taking 25.8741s to taking 11.5712s.

This also fixes a FIXME.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8890 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-10-06 15:23:43 +00:00
parent d5a310e4b3
commit 5f92e2b11f
2 changed files with 5 additions and 8 deletions
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8
lib/Transforms/Utils/InlineFunction.cpp
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@ -124,14 +124,6 @@ bool InlineFunction(CallSite CS) {
// Make a vector to capture the return instructions in the cloned function...
std::vector<ReturnInst*> Returns;
// Populate the value map with all of the globals in the program.
// FIXME: This should be the default for CloneFunctionInto!
Module &M = *Caller->getParent();
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
ValueMap[I] = I;
for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
ValueMap[I] = I;
// Do all of the hard part of cloning the callee into the caller...
CloneFunctionInto(Caller, CalledFunc, ValueMap, Returns, ".i");

5
lib/Transforms/Utils/ValueMapper.cpp
View File

@ -13,6 +13,11 @@ Value *MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
Value *&VMSlot = VM[V];
if (VMSlot) return VMSlot; // Does it exist in the map yet?
// Global values do not need to be seeded into the ValueMap if they are using
// the identity mapping.
if (isa<GlobalValue>(V))
return VMSlot = const_cast<Value*>(V);
if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
isa<ConstantPointerNull>(C))