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Make inlining costs more accurate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30231 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-09 20:40:44 +00:00
parent 8e49e08f4b
commit 7b166d9969
1 changed files with 26 additions and 3 deletions
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29
lib/Transforms/IPO/InlineSimple.cpp
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@ -138,9 +138,32 @@ void FunctionInfo::analyzeFunction(Function *F) {
// each instruction counts as 10.
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
for (BasicBlock::const_iterator II = BB->begin(), E = BB->end();
II != E; ++II)
if (!isa<DbgInfoIntrinsic>(II))
++NumInsts;
II != E; ++II) {
if (isa<DbgInfoIntrinsic>(II)) continue; // Debug intrinsics don't count.
// Noop casts don't count.
if (const CastInst *CI = dyn_cast<CastInst>(II)) {
const Type *OpTy = CI->getOperand(0)->getType();
if (CI->getType()->isLosslesslyConvertibleTo(OpTy))
continue;
if ((isa<PointerType>(CI->getType()) && OpTy->isInteger()) ||
(isa<PointerType>(OpTy) && CI->getType()->isInteger()))
continue; // ptr <-> int is *probably* noop cast.
} else if (const GetElementPtrInst *GEPI =
dyn_cast<GetElementPtrInst>(II)) {
// If a GEP has all constant indices, it will probably be folded with
// a load/store.
bool AllConstant = true;
for (unsigned i = 1, e = GEPI->getNumOperands(); i != e; ++i)
if (!isa<ConstantInt>(GEPI->getOperand(i))) {
AllConstant = false;
break;
}
if (AllConstant) continue;
}
++NumInsts;
}
++NumBlocks;
}