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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140916 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-10-01 01:27:56 +00:00
parent 0bcd9c70b1
commit 5c655413cf
4 changed files with 69 additions and 69 deletions
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10
include/llvm/Analysis/CodeMetrics.h
View File

@ -46,7 +46,7 @@ namespace llvm {
/// NumCalls - Keep track of the number of calls to 'big' functions.
unsigned NumCalls;
/// NumInlineCandidates - Keep track of the number of calls to internal
/// functions with only a single caller. These are likely targets for
/// future inlining, likely exposed by interleaved devirtualization.
@ -61,9 +61,9 @@ namespace llvm {
unsigned NumRets;
CodeMetrics() : callsSetJmp(false), isRecursive(false),
containsIndirectBr(false), usesDynamicAlloca(false),
containsIndirectBr(false), usesDynamicAlloca(false),
NumInsts(0), NumBlocks(0), NumCalls(0),
NumInlineCandidates(0), NumVectorInsts(0),
NumInlineCandidates(0), NumVectorInsts(0),
NumRets(0) {}
/// analyzeBasicBlock - Add information about the specified basic block
@ -73,12 +73,12 @@ namespace llvm {
/// analyzeFunction - Add information about the specified function
/// to the current structure.
void analyzeFunction(Function *F);
/// CountCodeReductionForConstant - Figure out an approximation for how
/// many instructions will be constant folded if the specified value is
/// constant.
unsigned CountCodeReductionForConstant(Value *V);
/// CountBonusForConstant - Figure out an approximation for how much
/// per-call performance boost we can expect if the specified value is
/// constant.

92
lib/Analysis/InlineCost.cpp
View File

@ -24,13 +24,13 @@ using namespace llvm;
/// TODO: Perhaps calls like memcpy, strcpy, etc?
bool llvm::callIsSmall(const Function *F) {
if (!F) return false;
if (F->hasLocalLinkage()) return false;
if (!F->hasName()) return false;
StringRef Name = F->getName();
// These will all likely lower to a single selection DAG node.
if (Name == "copysign" || Name == "copysignf" || Name == "copysignl" ||
Name == "fabs" || Name == "fabsf" || Name == "fabsl" ||
@ -38,7 +38,7 @@ bool llvm::callIsSmall(const Function *F) {
Name == "cos" || Name == "cosf" || Name == "cosl" ||
Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl" )
return true;
// These are all likely to be optimized into something smaller.
if (Name == "pow" || Name == "powf" || Name == "powl" ||
Name == "exp2" || Name == "exp2l" || Name == "exp2f" ||
@ -46,7 +46,7 @@ bool llvm::callIsSmall(const Function *F) {
Name == "round" || Name == "ffs" || Name == "ffsl" ||
Name == "abs" || Name == "labs" || Name == "llabs")
return true;
return false;
}
@ -67,8 +67,8 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
ImmutableCallSite CS(cast<Instruction>(II));
if (const Function *F = CS.getCalledFunction()) {
// If a function is both internal and has a single use, then it is
// extremely likely to get inlined in the future (it was probably
// If a function is both internal and has a single use, then it is
// extremely likely to get inlined in the future (it was probably
// exposed by an interleaved devirtualization pass).
if (F->hasInternalLinkage() && F->hasOneUse())
++NumInlineCandidates;
@ -91,18 +91,18 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
++NumCalls;
}
}
if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
if (!AI->isStaticAlloca())
this->usesDynamicAlloca = true;
}
if (isa<ExtractElementInst>(II) || II->getType()->isVectorTy())
++NumVectorInsts;
++NumVectorInsts;
if (const CastInst *CI = dyn_cast<CastInst>(II)) {
// Noop casts, including ptr <-> int, don't count.
if (CI->isLosslessCast() || isa<IntToPtrInst>(CI) ||
if (CI->isLosslessCast() || isa<IntToPtrInst>(CI) ||
isa<PtrToIntInst>(CI))
continue;
// Result of a cmp instruction is often extended (to be used by other
@ -119,10 +119,10 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
++NumInsts;
}
if (isa<ReturnInst>(BB->getTerminator()))
++NumRets;
// We never want to inline functions that contain an indirectbr. This is
// incorrect because all the blockaddress's (in static global initializers
// for example) would be referring to the original function, and this indirect
@ -252,7 +252,7 @@ void InlineCostAnalyzer::FunctionInfo::analyzeFunction(Function *F) {
/// NeverInline - returns true if the function should never be inlined into
/// any caller
bool InlineCostAnalyzer::FunctionInfo::NeverInline() {
return (Metrics.callsSetJmp || Metrics.isRecursive ||
return (Metrics.callsSetJmp || Metrics.isRecursive ||
Metrics.containsIndirectBr);
}
// getSpecializationBonus - The heuristic used to determine the per-call
@ -263,16 +263,16 @@ int InlineCostAnalyzer::getSpecializationBonus(Function *Callee,
{
if (Callee->mayBeOverridden())
return 0;
int Bonus = 0;
// If this function uses the coldcc calling convention, prefer not to
// specialize it.
if (Callee->getCallingConv() == CallingConv::Cold)
Bonus -= InlineConstants::ColdccPenalty;
// Get information about the callee.
FunctionInfo *CalleeFI = &CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI->Metrics.NumBlocks == 0)
CalleeFI->analyzeFunction(Callee);
@ -286,7 +286,7 @@ int InlineCostAnalyzer::getSpecializationBonus(Function *Callee,
Bonus += CountBonusForConstant(I);
}
// Calls usually take a long time, so they make the specialization gain
// Calls usually take a long time, so they make the specialization gain
// smaller.
Bonus -= CalleeFI->Metrics.NumCalls * InlineConstants::CallPenalty;
@ -300,13 +300,13 @@ int InlineCostAnalyzer::getSpecializationBonus(Function *Callee,
// inlining because we decide we don't want to give a bonus for
// devirtualizing.
int InlineCostAnalyzer::ConstantFunctionBonus(CallSite CS, Constant *C) {
// This could just be NULL.
if (!C) return 0;
Function *F = dyn_cast<Function>(C);
if (!F) return 0;
int Bonus = InlineConstants::IndirectCallBonus + getInlineSize(CS, F);
return (Bonus > 0) ? 0 : Bonus;
}
@ -355,18 +355,18 @@ int InlineCostAnalyzer::CountBonusForConstant(Value *V, Constant *C) {
Bonus += CountBonusForConstant(&Inst);
}
}
return Bonus;
}
int InlineCostAnalyzer::getInlineSize(CallSite CS, Function *Callee) {
// Get information about the callee.
FunctionInfo *CalleeFI = &CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI->Metrics.NumBlocks == 0)
CalleeFI->analyzeFunction(Callee);
// InlineCost - This value measures how good of an inline candidate this call
// site is to inline. A lower inline cost make is more likely for the call to
// be inlined. This value may go negative.
@ -392,9 +392,9 @@ int InlineCostAnalyzer::getInlineSize(CallSite CS, Function *Callee) {
// weights calculated for the callee to determine how much will be folded
// away with this information.
else if (isa<Constant>(I))
InlineCost -= CalleeFI->ArgumentWeights[ArgNo].ConstantWeight;
InlineCost -= CalleeFI->ArgumentWeights[ArgNo].ConstantWeight;
}
// Each argument passed in has a cost at both the caller and the callee
// sides. Measurements show that each argument costs about the same as an
// instruction.
@ -408,28 +408,28 @@ int InlineCostAnalyzer::getInlineSize(CallSite CS, Function *Callee) {
// Look at the size of the callee. Each instruction counts as 5.
InlineCost += CalleeFI->Metrics.NumInsts*InlineConstants::InstrCost;
return InlineCost;
}
int InlineCostAnalyzer::getInlineBonuses(CallSite CS, Function *Callee) {
// Get information about the callee.
FunctionInfo *CalleeFI = &CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI->Metrics.NumBlocks == 0)
CalleeFI->analyzeFunction(Callee);
bool isDirectCall = CS.getCalledFunction() == Callee;
Instruction *TheCall = CS.getInstruction();
int Bonus = 0;
// If there is only one call of the function, and it has internal linkage,
// make it almost guaranteed to be inlined.
//
if (Callee->hasLocalLinkage() && Callee->hasOneUse() && isDirectCall)
Bonus += InlineConstants::LastCallToStaticBonus;
// If the instruction after the call, or if the normal destination of the
// invoke is an unreachable instruction, the function is noreturn. As such,
// there is little point in inlining this.
@ -438,12 +438,12 @@ int InlineCostAnalyzer::getInlineBonuses(CallSite CS, Function *Callee) {
Bonus += InlineConstants::NoreturnPenalty;
} else if (isa<UnreachableInst>(++BasicBlock::iterator(TheCall)))
Bonus += InlineConstants::NoreturnPenalty;
// If this function uses the coldcc calling convention, prefer not to inline
// it.
if (Callee->getCallingConv() == CallingConv::Cold)
Bonus += InlineConstants::ColdccPenalty;
// Add to the inline quality for properties that make the call valuable to
// inline. This includes factors that indicate that the result of inlining
// the function will be optimizable. Currently this just looks at arguments
@ -455,7 +455,7 @@ int InlineCostAnalyzer::getInlineBonuses(CallSite CS, Function *Callee) {
// Compute any constant bonus due to inlining we want to give here.
if (isa<Constant>(I))
Bonus += CountBonusForConstant(FI, cast<Constant>(I));
return Bonus;
}
@ -483,7 +483,7 @@ InlineCost InlineCostAnalyzer::getInlineCost(CallSite CS,
// Get information about the callee.
FunctionInfo *CalleeFI = &CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI->Metrics.NumBlocks == 0)
CalleeFI->analyzeFunction(Callee);
@ -498,7 +498,7 @@ InlineCost InlineCostAnalyzer::getInlineCost(CallSite CS,
// requires handling setjmp somewhere else, however.
if (!Callee->isDeclaration() && Callee->hasFnAttr(Attribute::AlwaysInline))
return InlineCost::getAlways();
if (CalleeFI->Metrics.usesDynamicAlloca) {
// Get information about the caller.
FunctionInfo &CallerFI = CachedFunctionInfo[Caller];
@ -506,7 +506,7 @@ InlineCost InlineCostAnalyzer::getInlineCost(CallSite CS,
// If we haven't calculated this information yet, do so now.
if (CallerFI.Metrics.NumBlocks == 0) {
CallerFI.analyzeFunction(Caller);
// Recompute the CalleeFI pointer, getting Caller could have invalidated
// it.
CalleeFI = &CachedFunctionInfo[Callee];
@ -538,16 +538,16 @@ InlineCost InlineCostAnalyzer::getSpecializationCost(Function *Callee,
// something else.
if (Callee->mayBeOverridden())
return llvm::InlineCost::getNever();
// Get information about the callee.
FunctionInfo *CalleeFI = &CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI->Metrics.NumBlocks == 0)
CalleeFI->analyzeFunction(Callee);
int Cost = 0;
// Look at the original size of the callee. Each instruction counts as 5.
Cost += CalleeFI->Metrics.NumInsts * InlineConstants::InstrCost;
@ -564,10 +564,10 @@ InlineCost InlineCostAnalyzer::getSpecializationCost(Function *Callee,
// higher threshold to determine if the function call should be inlined.
float InlineCostAnalyzer::getInlineFudgeFactor(CallSite CS) {
Function *Callee = CS.getCalledFunction();
// Get information about the callee.
FunctionInfo &CalleeFI = CachedFunctionInfo[Callee];
// If we haven't calculated this information yet, do so now.
if (CalleeFI.Metrics.NumBlocks == 0)
CalleeFI.analyzeFunction(Callee);
@ -604,7 +604,7 @@ InlineCostAnalyzer::growCachedCostInfo(Function *Caller, Function *Callee) {
--CallerMetrics.NumCalls;
if (Callee == 0) return;
CodeMetrics &CalleeMetrics = CachedFunctionInfo[Callee].Metrics;
// If we don't have metrics for the callee, don't recalculate them just to
@ -614,7 +614,7 @@ InlineCostAnalyzer::growCachedCostInfo(Function *Caller, Function *Callee) {
resetCachedCostInfo(Caller);
return;
}
// Since CalleeMetrics were already calculated, we know that the CallerMetrics
// reference isn't invalidated: both were in the DenseMap.
CallerMetrics.usesDynamicAlloca |= CalleeMetrics.usesDynamicAlloca;
@ -636,7 +636,7 @@ InlineCostAnalyzer::growCachedCostInfo(Function *Caller, Function *Callee) {
CallerMetrics.NumInsts -= Callee->arg_size();
else
CallerMetrics.NumInsts = 0;
// We are not updating the argument weights. We have already determined that
// Caller is a fairly large function, so we accept the loss of precision.
}

12
lib/Transforms/IPO/InlineAlways.cpp
View File

@ -32,10 +32,10 @@ namespace {
// AlwaysInliner only inlines functions that are mark as "always inline".
class AlwaysInliner : public Inliner {
// Functions that are never inlined
SmallPtrSet<const Function*, 16> NeverInline;
SmallPtrSet<const Function*, 16> NeverInline;
InlineCostAnalyzer CA;
public:
// Use extremely low threshold.
// Use extremely low threshold.
AlwaysInliner() : Inliner(ID, -2000000000) {
initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
}
@ -52,8 +52,8 @@ namespace {
void growCachedCostInfo(Function* Caller, Function* Callee) {
CA.growCachedCostInfo(Caller, Callee);
}
virtual bool doFinalization(CallGraph &CG) {
return removeDeadFunctions(CG, &NeverInline);
virtual bool doFinalization(CallGraph &CG) {
return removeDeadFunctions(CG, &NeverInline);
}
virtual bool doInitialization(CallGraph &CG);
void releaseMemory() {
@ -71,11 +71,11 @@ INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
// doInitialization - Initializes the vector of functions that have not
// doInitialization - Initializes the vector of functions that have not
// been annotated with the "always inline" attribute.
bool AlwaysInliner::doInitialization(CallGraph &CG) {
Module &M = CG.getModule();
for (Module::iterator I = M.begin(), E = M.end();
I != E; ++I)
if (!I->isDeclaration() && !I->hasFnAttr(Attribute::AlwaysInline))

24
lib/Transforms/IPO/InlineSimple.cpp
View File

@ -30,7 +30,7 @@ namespace {
class SimpleInliner : public Inliner {
// Functions that are never inlined
SmallPtrSet<const Function*, 16> NeverInline;
SmallPtrSet<const Function*, 16> NeverInline;
InlineCostAnalyzer CA;
public:
SimpleInliner() : Inliner(ID) {
@ -68,16 +68,16 @@ INITIALIZE_PASS_END(SimpleInliner, "inline",
Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
Pass *llvm::createFunctionInliningPass(int Threshold) {
Pass *llvm::createFunctionInliningPass(int Threshold) {
return new SimpleInliner(Threshold);
}
// doInitialization - Initializes the vector of functions that have been
// annotated with the noinline attribute.
bool SimpleInliner::doInitialization(CallGraph &CG) {
Module &M = CG.getModule();
for (Module::iterator I = M.begin(), E = M.end();
I != E; ++I)
if (!I->isDeclaration() && I->hasFnAttr(Attribute::NoInline))
@ -85,34 +85,34 @@ bool SimpleInliner::doInitialization(CallGraph &CG) {
// Get llvm.noinline
GlobalVariable *GV = M.getNamedGlobal("llvm.noinline");
if (GV == 0)
return false;
// Don't crash on invalid code
if (!GV->hasDefinitiveInitializer())
return false;
const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
if (InitList == 0)
return false;
// Iterate over each element and add to the NeverInline set
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
// Get Source
const Constant *Elt = InitList->getOperand(i);
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(Elt))
if (CE->getOpcode() == Instruction::BitCast)
if (CE->getOpcode() == Instruction::BitCast)
Elt = CE->getOperand(0);
// Insert into set of functions to never inline
if (const Function *F = dyn_cast<Function>(Elt))
NeverInline.insert(F);
}
return false;
}