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Differential D15676

[attrs] Extract the pure inference of function attributes into a standalone pass.
ClosedPublic

Authored by chandlerc on Dec 20 2015, 2:53 AM.

Details

Reviewers
jmolloy
mehdi_amini
Commits
rG3a040e6d4782: [attrs] Extract the pure inference of function attributes into a standalone…
rL256466: [attrs] Extract the pure inference of function attributes into
Summary

There is no call graph or even interesting analysis for this part of
function attributes -- it is literally inferring attributes based on the
target library identification. As such, we can do it using a much
simpler module pass that just walks the declarations. This can also
happen much earlier in the pass pipeline which has benefits for any
number of other passes.

In the process, I've had to clean up several aspects of this logic.
First, the pass now counts inferred attributes independently rather than
just counting all the inferred attributes as one, and the counts are
more clearly explained. Second, the pass infers at least some of the
library functions as norecurse. I've been *exceedingly* conservative
here and only added it for library functions that I could instantly and
confidently make this claim. Things like printf and malloc or any
function which I could imagine some how, even through very strange steps
such as malloc hooks or a recursive printf implementation, I left alone.
This at least allowed me to keep the no-recurse logic in place rather
than having to delete it for being unused just to add it back when we
decide to finish annotating such things. We should go through and be
more aggressive about norecurse I suspect.

The two test cases we had for this code path are both ... woefully
inadequate and copies of each other. I've kept the superset test and
updated it. We need more testing here, but I had to pick somewhere to
stop fixing everything broken I saw here.

Depends on D15668.

Diff Detail

Event Timeline

chandlerc updated this revision to Diff 43322.Dec 20 2015, 2:53 AM
chandlerc retitled this revision from to [attrs] Extract the pure inference of function attributes into a standalone pass..
chandlerc updated this object.
chandlerc added reviewers: jmolloy, mehdi_amini.
chandlerc added a parent revision: D15668: [attrs] Split off the forced attributes utility into its own pass that can be potentially run much earlier than FuncitonAttrs proper..
chandlerc added a subscriber: llvm-commits.
Herald added a subscriber: mehdi_amini. · View Herald TranscriptDec 20 2015, 2:53 AM
chandlerc updated this revision to Diff 43324.Dec 20 2015, 3:13 AM

Finish wiring up the new pass manager for inferring function attrs, and test it.

reames added a subscriber: reames.Dec 20 2015, 6:06 PM

For some reason, I can't seem to log in to phabricator at the moment...
A couple of comments below.

"InferFunctionAttrs" - bikeshed wise, this seems like a very generic,
non-discriptive name. Possibly: InferFunctionAttrsFromTLI? Or
something which otherwise gives a clue as to what we're infering from?

This really seems like it should somehow be a tablegen file. I know
you're just moving code around, but the long list of hand written code
for each function smells. Particularly the type checking of arguments
after TLI already matched to an enum...

Stale comment in "inferAllPrototypeAttributes".

I'm uncomfortable with the addition of the various no-recurse
attributes. I'm not saying your choices are wrong, but mixing them in
with a large code motion patch makes them hard to review. There's also a
question of what we're assuming about the runtime environment. After
all, there is a perfectly legal (if unlikely) recursive implementation
of strlen.

Otherwise, LGTM.

Philip

jmolloy accepted this revision.Dec 21 2015, 2:06 AM
jmolloy edited edge metadata.

Hi Chandler,

Thanks for taking the time to do this.

I agree with Philip - while I like that you've added extra norecurse attributes, I don't like that it's smuggled in as part of this patch. I'd highly prefer this patch to be NFC and then a simple update patch adding the norecurse attributes.

Apart from that and the specific comment below, it LGTM.

Cheers,

James

include/llvm/Transforms/IPO/InferFunctionAttrs.h
26

Double period.

27

Unrelated: Damn, new style passes look so much nicer!

This revision is now accepted and ready to land.Dec 21 2015, 2:06 AM
probinson added a subscriber: probinson.Dec 21 2015, 9:43 AM
probinson added inline comments.
lib/Transforms/IPO/InferFunctionAttrs.cpp
927

s/everything/anything/

chandlerc marked 3 inline comments as done.Dec 27 2015, 12:43 AM

Updated to address all comments. I've stripped out the norecurse stuff. This means that we'll have to add back infrastructure for counting statistics on such attributes, which was the only reason I added it here. I tried to explain that clearly in the description of the change; there was no attempt to smuggle anything here.

Anyways, after long discussions about this attribute, its semantics are much more surprising than I originally realized (at least to me) and so clearly it shouldn't be inferred just yet. This is now *just* moving to an earlier inference model in a separate pass with more detailed statistics tracking.

To address Philip's points:

First, I've fixed the stale comment, thanks!

I do agree that this huge switch is... undesirable. But I'd like to save fixing this more deeply for some other day / time / person / project. There is more wrong than just the use of a huge switch. For example, Why does this only fire on declarations??? It should fire on definitions as well! We have the no-builtin mechanism that should prevent TLI from recognizing non-builtin routines that we shouldn't make such inferences about. Anyways, I'm very happy if someone wants to keep cleaning this up, but I'm going to prioritize the pass manager centric work.

Finally, I tried to think of a better name, but I kept coming back to this one. It really is a generic attribute *inference* pass. It doesn't analyze or compute anything, it just infers expected attributes based on a-priori information. At the moment that is encapsulated by TLI, but I don't think the pass should be restricted to the *source* of inference but merely to it being inference as opposed to logical analysis of the program in some way.

That said, I am very happy to change the name of this if you or others come up with something better, and I don't think that should block progress here, so I'm going to keep rolling and we can do a rename at-will.

Thanks all!

Closed by commit rL256466: [attrs] Extract the pure inference of function attributes into (authored by chandlerc). · Explain WhyDec 27 2015, 12:45 AM
This revision was automatically updated to reflect the committed changes.
jevinskie added a subscriber: jevinskie.Dec 28 2015, 10:59 AM

Revision Contents

PathSize
include/
llvm/
1 line
Transforms/
IPO/
38 lines
lib/
Passes/
1 line
Transforms/
IPO/
1 line
853 lines
1 line
962 lines
22 lines
test/
Transforms/
FunctionAttrs/
InferFunctionAttrs/
FunctionAttrs/
annotate.ll
annotate-1.ll
6 lines
InstCombine/
2 lines

Diff 43322

include/llvm/InitializePasses.h

Show First 20 Lines • Show All 139 Lines • ▼ Show 20 Lines
void initializeGlobalOptPass(PassRegistry&); void initializeGlobalOptPass(PassRegistry&);
void initializeGlobalsAAWrapperPassPass(PassRegistry&); void initializeGlobalsAAWrapperPassPass(PassRegistry&);
void initializeIPCPPass(PassRegistry&); void initializeIPCPPass(PassRegistry&);
void initializeIPSCCPPass(PassRegistry&); void initializeIPSCCPPass(PassRegistry&);
void initializeIVUsersPass(PassRegistry&); void initializeIVUsersPass(PassRegistry&);
void initializeIfConverterPass(PassRegistry&); void initializeIfConverterPass(PassRegistry&);
void initializeInductiveRangeCheckEliminationPass(PassRegistry&); void initializeInductiveRangeCheckEliminationPass(PassRegistry&);
void initializeIndVarSimplifyPass(PassRegistry&); void initializeIndVarSimplifyPass(PassRegistry&);
void initializeInferFunctionAttrsLegacyPassPass(PassRegistry&);
void initializeInlineCostAnalysisPass(PassRegistry&); void initializeInlineCostAnalysisPass(PassRegistry&);
void initializeInstructionCombiningPassPass(PassRegistry&); void initializeInstructionCombiningPassPass(PassRegistry&);
void initializeInstCountPass(PassRegistry&); void initializeInstCountPass(PassRegistry&);
void initializeInstNamerPass(PassRegistry&); void initializeInstNamerPass(PassRegistry&);
void initializeInternalizePassPass(PassRegistry&); void initializeInternalizePassPass(PassRegistry&);
void initializeIntervalPartitionPass(PassRegistry&); void initializeIntervalPartitionPass(PassRegistry&);
void initializeJumpThreadingPass(PassRegistry&); void initializeJumpThreadingPass(PassRegistry&);
void initializeLCSSAPass(PassRegistry&); void initializeLCSSAPass(PassRegistry&);
▲ Show 20 Lines • Show All 158 Lines • Show Last 20 Lines

include/llvm/Transforms/IPO/InferFunctionAttrs.h

  • This file was added.
//===-- InferFunctionAttrs.h - Infer implicit function attributes ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Interfaces for passes which infer implicit function attributes from the
/// name and signature of function declarations.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H
#define LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
/// A pass which infers function attributes from the names and signatures of
/// function declarations in a module..
class InferFunctionAttrsPass {
jmolloyUnsubmitted
Done
ReplyInline Actions

Double period.

jmolloy: Double period.
public:
jmolloyUnsubmitted
Done
ReplyInline Actions

Unrelated: Damn, new style passes look so much nicer!

jmolloy: Unrelated: Damn, new style passes look so much nicer!
static StringRef name() { return "InferFunctionAttrsPass"; }
PreservedAnalyses run(Module &M, AnalysisManager<Module> *AM);
};
/// Create a legacy pass manager instance of a pass to infer function
/// attributes.
Pass *createInferFunctionAttrsLegacyPass();
}
#endif // LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H

lib/Passes/PassBuilder.cpp

Show All 24 Lines
#include "llvm/Analysis/TargetTransformInfo.h" #include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/IR/Dominators.h" #include "llvm/IR/Dominators.h"
#include "llvm/IR/IRPrintingPasses.h" #include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/PassManager.h" #include "llvm/IR/PassManager.h"
#include "llvm/IR/Verifier.h" #include "llvm/IR/Verifier.h"
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/IPO/ForceFunctionAttrs.h" #include "llvm/Transforms/IPO/ForceFunctionAttrs.h"
#include "llvm/Transforms/IPO/InferFunctionAttrs.h"
#include "llvm/Transforms/IPO/StripDeadPrototypes.h" #include "llvm/Transforms/IPO/StripDeadPrototypes.h"
#include "llvm/Transforms/InstCombine/InstCombine.h" #include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Scalar/ADCE.h" #include "llvm/Transforms/Scalar/ADCE.h"
#include "llvm/Transforms/Scalar/EarlyCSE.h" #include "llvm/Transforms/Scalar/EarlyCSE.h"
#include "llvm/Transforms/Scalar/LowerExpectIntrinsic.h" #include "llvm/Transforms/Scalar/LowerExpectIntrinsic.h"
#include "llvm/Transforms/Scalar/SROA.h" #include "llvm/Transforms/Scalar/SROA.h"
#include "llvm/Transforms/Scalar/SimplifyCFG.h" #include "llvm/Transforms/Scalar/SimplifyCFG.h"
▲ Show 20 Lines • Show All 377 Lines • Show Last 20 Lines

lib/Transforms/IPO/CMakeLists.txt

add_llvm_library(LLVMipo add_llvm_library(LLVMipo
ArgumentPromotion.cpp ArgumentPromotion.cpp
BarrierNoopPass.cpp BarrierNoopPass.cpp
ConstantMerge.cpp ConstantMerge.cpp
CrossDSOCFI.cpp CrossDSOCFI.cpp
DeadArgumentElimination.cpp DeadArgumentElimination.cpp
ElimAvailExtern.cpp ElimAvailExtern.cpp
ExtractGV.cpp ExtractGV.cpp
ForceFunctionAttrs.cpp ForceFunctionAttrs.cpp
FunctionAttrs.cpp FunctionAttrs.cpp
FunctionImport.cpp FunctionImport.cpp
GlobalDCE.cpp GlobalDCE.cpp
GlobalOpt.cpp GlobalOpt.cpp
IPConstantPropagation.cpp IPConstantPropagation.cpp
IPO.cpp IPO.cpp
InferFunctionAttrs.cpp
InlineAlways.cpp InlineAlways.cpp
InlineSimple.cpp InlineSimple.cpp
Inliner.cpp Inliner.cpp
Internalize.cpp Internalize.cpp
LoopExtractor.cpp LoopExtractor.cpp
LowerBitSets.cpp LowerBitSets.cpp
MergeFunctions.cpp MergeFunctions.cpp
PartialInlining.cpp PartialInlining.cpp
Show All 12 Lines

lib/Transforms/IPO/FunctionAttrs.cpp

Show First 20 Lines • Show All 44 Lines • ▼ Show 20 Lines
STATISTIC(NumReadNone, "Number of functions marked readnone"); STATISTIC(NumReadNone, "Number of functions marked readnone");
STATISTIC(NumReadOnly, "Number of functions marked readonly"); STATISTIC(NumReadOnly, "Number of functions marked readonly");
STATISTIC(NumNoCapture, "Number of arguments marked nocapture"); STATISTIC(NumNoCapture, "Number of arguments marked nocapture");
STATISTIC(NumReadNoneArg, "Number of arguments marked readnone"); STATISTIC(NumReadNoneArg, "Number of arguments marked readnone");
STATISTIC(NumReadOnlyArg, "Number of arguments marked readonly"); STATISTIC(NumReadOnlyArg, "Number of arguments marked readonly");
STATISTIC(NumNoAlias, "Number of function returns marked noalias"); STATISTIC(NumNoAlias, "Number of function returns marked noalias");
STATISTIC(NumNonNullReturn, "Number of function returns marked nonnull"); STATISTIC(NumNonNullReturn, "Number of function returns marked nonnull");
STATISTIC(NumAnnotated, "Number of attributes added to library functions");
STATISTIC(NumNoRecurse, "Number of functions marked as norecurse"); STATISTIC(NumNoRecurse, "Number of functions marked as norecurse");
namespace { namespace {
typedef SmallSetVector<Function *, 8> SCCNodeSet; typedef SmallSetVector<Function *, 8> SCCNodeSet;
} }
namespace { namespace {
struct FunctionAttrs : public CallGraphSCCPass { struct FunctionAttrs : public CallGraphSCCPass {
▲ Show 20 Lines • Show All 875 Lines • ▼ Show 20 Lines for (Function *F : SCCNodes) {
++NumNonNullReturn; ++NumNonNullReturn;
MadeChange = true; MadeChange = true;
} }
} }
return MadeChange; return MadeChange;
} }
static void setDoesNotAccessMemory(Function &F) {
if (!F.doesNotAccessMemory()) {
F.setDoesNotAccessMemory();
++NumAnnotated;
}
}
static void setOnlyReadsMemory(Function &F) {
if (!F.onlyReadsMemory()) {
F.setOnlyReadsMemory();
++NumAnnotated;
}
}
static void setDoesNotThrow(Function &F) {
if (!F.doesNotThrow()) {
F.setDoesNotThrow();
++NumAnnotated;
}
}
static void setDoesNotCapture(Function &F, unsigned n) {
if (!F.doesNotCapture(n)) {
F.setDoesNotCapture(n);
++NumAnnotated;
}
}
static void setOnlyReadsMemory(Function &F, unsigned n) {
if (!F.onlyReadsMemory(n)) {
F.setOnlyReadsMemory(n);
++NumAnnotated;
}
}
static void setDoesNotAlias(Function &F, unsigned n) {
if (!F.doesNotAlias(n)) {
F.setDoesNotAlias(n);
++NumAnnotated;
}
}
static bool setDoesNotRecurse(Function &F) { static bool setDoesNotRecurse(Function &F) {
if (F.doesNotRecurse()) if (F.doesNotRecurse())
return false; return false;
F.setDoesNotRecurse(); F.setDoesNotRecurse();
++NumNoRecurse; ++NumNoRecurse;
return true; return true;
} }
/// Analyze the name and prototype of the given function and set any applicable
/// attributes.
///
/// Returns true if any attributes were set and false otherwise.
static bool inferPrototypeAttributes(Function &F, const TargetLibraryInfo &TLI) {
if (F.hasFnAttribute(Attribute::OptimizeNone))
return false;
FunctionType *FTy = F.getFunctionType();
LibFunc::Func TheLibFunc;
if (!(TLI.getLibFunc(F.getName(), TheLibFunc) && TLI.has(TheLibFunc)))
return false;
switch (TheLibFunc) {
case LibFunc::strlen:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::strchr:
case LibFunc::strrchr:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isIntegerTy())
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
break;
case LibFunc::strtol:
case LibFunc::strtod:
case LibFunc::strtof:
case LibFunc::strtoul:
case LibFunc::strtoll:
case LibFunc::strtold:
case LibFunc::strtoull:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::strcpy:
case LibFunc::stpcpy:
case LibFunc::strcat:
case LibFunc::strncat:
case LibFunc::strncpy:
case LibFunc::stpncpy:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::strxfrm:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::strcmp: // 0,1
case LibFunc::strspn: // 0,1
case LibFunc::strncmp: // 0,1
case LibFunc::strcspn: // 0,1
case LibFunc::strcoll: // 0,1
case LibFunc::strcasecmp: // 0,1
case LibFunc::strncasecmp: //
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
break;
case LibFunc::strstr:
case LibFunc::strpbrk:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::strtok:
case LibFunc::strtok_r:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::setbuf:
case LibFunc::setvbuf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::strdup:
case LibFunc::strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::stat:
case LibFunc::statvfs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::sscanf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::sprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::snprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 3);
setOnlyReadsMemory(F, 3);
break;
case LibFunc::setitimer:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setDoesNotCapture(F, 3);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::system:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "system" is a valid pthread cancellation point.
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::malloc:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
break;
case LibFunc::memcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
break;
case LibFunc::memchr:
case LibFunc::memrchr:
if (FTy->getNumParams() != 3)
return false;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
break;
case LibFunc::modf:
case LibFunc::modff:
case LibFunc::modfl:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::memcpy:
case LibFunc::memccpy:
case LibFunc::memmove:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::memalign:
if (!FTy->getReturnType()->isPointerTy())
return false;
setDoesNotAlias(F, 0);
break;
case LibFunc::mkdir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::mktime:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::realloc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
break;
case LibFunc::read:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "read" is a valid pthread cancellation point.
setDoesNotCapture(F, 2);
break;
case LibFunc::rewind:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::rmdir:
case LibFunc::remove:
case LibFunc::realpath:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::rename:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::readlink:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::write:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "write" is a valid pthread cancellation point.
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::bcopy:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::bcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setOnlyReadsMemory(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
break;
case LibFunc::bzero:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::calloc:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
break;
case LibFunc::chmod:
case LibFunc::chown:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::ctermid:
case LibFunc::clearerr:
case LibFunc::closedir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::atoi:
case LibFunc::atol:
case LibFunc::atof:
case LibFunc::atoll:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setOnlyReadsMemory(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::access:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::fopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::fdopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::feof:
case LibFunc::free:
case LibFunc::fseek:
case LibFunc::ftell:
case LibFunc::fgetc:
case LibFunc::fseeko:
case LibFunc::ftello:
case LibFunc::fileno:
case LibFunc::fflush:
case LibFunc::fclose:
case LibFunc::fsetpos:
case LibFunc::flockfile:
case LibFunc::funlockfile:
case LibFunc::ftrylockfile:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::ferror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F);
break;
case LibFunc::fputc:
case LibFunc::fstat:
case LibFunc::frexp:
case LibFunc::frexpf:
case LibFunc::frexpl:
case LibFunc::fstatvfs:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::fgets:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 3);
break;
case LibFunc::fread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 4);
break;
case LibFunc::fwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 4);
break;
case LibFunc::fputs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::fscanf:
case LibFunc::fprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::fgetpos:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
break;
case LibFunc::getc:
case LibFunc::getlogin_r:
case LibFunc::getc_unlocked:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::getenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setOnlyReadsMemory(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::gets:
case LibFunc::getchar:
setDoesNotThrow(F);
break;
case LibFunc::getitimer:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::getpwnam:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::ungetc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::uname:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::unlink:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::unsetenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::utime:
case LibFunc::utimes:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::puts:
case LibFunc::printf:
case LibFunc::perror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::pread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pread" is a valid pthread cancellation point.
setDoesNotCapture(F, 2);
break;
case LibFunc::pwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pwrite" is a valid pthread cancellation point.
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::putchar:
setDoesNotThrow(F);
break;
case LibFunc::popen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::pclose:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::vscanf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::vsscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::vfscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::valloc:
if (!FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
break;
case LibFunc::vprintf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::vfprintf:
case LibFunc::vsprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::vsnprintf:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 3);
setOnlyReadsMemory(F, 3);
break;
case LibFunc::open:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::opendir:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::tmpfile:
if (!FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
break;
case LibFunc::times:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::htonl:
case LibFunc::htons:
case LibFunc::ntohl:
case LibFunc::ntohs:
setDoesNotThrow(F);
setDoesNotAccessMemory(F);
break;
case LibFunc::lstat:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::lchown:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::qsort:
if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
return false;
// May throw; places call through function pointer.
setDoesNotCapture(F, 4);
break;
case LibFunc::dunder_strdup:
case LibFunc::dunder_strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::dunder_strtok_r:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::under_IO_getc:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::under_IO_putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::dunder_isoc99_scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::stat64:
case LibFunc::lstat64:
case LibFunc::statvfs64:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::dunder_isoc99_sscanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::fopen64:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
setOnlyReadsMemory(F, 1);
setOnlyReadsMemory(F, 2);
break;
case LibFunc::fseeko64:
case LibFunc::ftello64:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
break;
case LibFunc::tmpfile64:
if (!FTy->getReturnType()->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotAlias(F, 0);
break;
case LibFunc::fstat64:
case LibFunc::fstatvfs64:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
setDoesNotThrow(F);
setDoesNotCapture(F, 2);
break;
case LibFunc::open64:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
setDoesNotCapture(F, 1);
setOnlyReadsMemory(F, 1);
break;
case LibFunc::gettimeofday:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
setDoesNotCapture(F, 2);
break;
default:
// Didn't mark any attributes.
return false;
}
return true;
}
static bool addNoRecurseAttrs(const CallGraphSCC &SCC, static bool addNoRecurseAttrs(const CallGraphSCC &SCC,
SmallVectorImpl<WeakVH> &Revisit) { SmallVectorImpl<WeakVH> &Revisit) {
// Try and identify functions that do not recurse. // Try and identify functions that do not recurse.
// If the SCC contains multiple nodes we know for sure there is recursion. // If the SCC contains multiple nodes we know for sure there is recursion.
if (!SCC.isSingular()) if (!SCC.isSingular())
return false; return false;
▲ Show 20 Lines • Show All 63 Lines • ▼ Show 20 Lines for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
Function *F = (*I)->getFunction(); Function *F = (*I)->getFunction();
if (!F || F->hasFnAttribute(Attribute::OptimizeNone)) { if (!F || F->hasFnAttribute(Attribute::OptimizeNone)) {
// External node or function we're trying not to optimize - we both avoid // External node or function we're trying not to optimize - we both avoid
// transform them and avoid leveraging information they provide. // transform them and avoid leveraging information they provide.
ExternalNode = true; ExternalNode = true;
continue; continue;
} }
// When initially processing functions, also infer their prototype
// attributes if they are declarations.
if (F->isDeclaration())
Changed |= inferPrototypeAttributes(*F, *TLI);
SCCNodes.insert(F); SCCNodes.insert(F);
} }
Changed |= addReadAttrs(SCCNodes, AARGetter); Changed |= addReadAttrs(SCCNodes, AARGetter);
Changed |= addArgumentAttrs(SCCNodes); Changed |= addArgumentAttrs(SCCNodes);
// If we have no external nodes participating in the SCC, we can infer some // If we have no external nodes participating in the SCC, we can deduce some
// more precise attributes as well. // more precise attributes as well.
if (!ExternalNode) { if (!ExternalNode) {
Changed |= addNoAliasAttrs(SCCNodes); Changed |= addNoAliasAttrs(SCCNodes);
Changed |= addNonNullAttrs(SCCNodes, *TLI); Changed |= addNonNullAttrs(SCCNodes, *TLI);
} }
Changed |= addNoRecurseAttrs(SCC, Revisit); Changed |= addNoRecurseAttrs(SCC, Revisit);
return Changed; return Changed;
Show All 13 Lines

lib/Transforms/IPO/IPO.cpp

Show All 28 Linesvoid llvm::initializeIPO(PassRegistry &Registry) {
initializeDAHPass(Registry); initializeDAHPass(Registry);
initializeForceFunctionAttrsLegacyPassPass(Registry); initializeForceFunctionAttrsLegacyPassPass(Registry);
initializeFunctionAttrsPass(Registry); initializeFunctionAttrsPass(Registry);
initializeGlobalDCEPass(Registry); initializeGlobalDCEPass(Registry);
initializeGlobalOptPass(Registry); initializeGlobalOptPass(Registry);
initializeIPCPPass(Registry); initializeIPCPPass(Registry);
initializeAlwaysInlinerPass(Registry); initializeAlwaysInlinerPass(Registry);
initializeSimpleInlinerPass(Registry); initializeSimpleInlinerPass(Registry);
initializeInferFunctionAttrsLegacyPassPass(Registry);
initializeInternalizePassPass(Registry); initializeInternalizePassPass(Registry);
initializeLoopExtractorPass(Registry); initializeLoopExtractorPass(Registry);
initializeBlockExtractorPassPass(Registry); initializeBlockExtractorPassPass(Registry);
initializeSingleLoopExtractorPass(Registry); initializeSingleLoopExtractorPass(Registry);
initializeLowerBitSetsPass(Registry); initializeLowerBitSetsPass(Registry);
initializeMergeFunctionsPass(Registry); initializeMergeFunctionsPass(Registry);
initializePartialInlinerPass(Registry); initializePartialInlinerPass(Registry);
initializePruneEHPass(Registry); initializePruneEHPass(Registry);
▲ Show 20 Lines • Show All 73 Lines • Show Last 20 Lines

lib/Transforms/IPO/InferFunctionAttrs.cpp

  • This file was added.
//===- InferFunctionAttrs.cpp - Infer implicit function attributes --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/InferFunctionAttrs.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "inferattrs"
STATISTIC(NumReadNone, "Number of functions inferred as readnone");
STATISTIC(NumReadOnly, "Number of functions inferred as readonly");
STATISTIC(NumNoRecurse, "Number of functions inferred as as norecurse");
STATISTIC(NumNoUnwind, "Number of functions inferred as nounwind");
STATISTIC(NumNoCapture, "Number of arguments inferred as nocapture");
STATISTIC(NumReadOnlyArg, "Number of arguments inferred as readonly");
STATISTIC(NumNoAlias, "Number of function returns inferred as noalias");
static bool setDoesNotAccessMemory(Function &F) {
if (F.doesNotAccessMemory())
return false;
F.setDoesNotAccessMemory();
++NumReadNone;
return true;
}
static bool setOnlyReadsMemory(Function &F) {
if (F.onlyReadsMemory())
return false;
F.setOnlyReadsMemory();
++NumReadOnly;
return true;
}
static bool setDoesNotRecurse(Function &F) {
if (F.doesNotRecurse())
return false;
F.setDoesNotRecurse();
++NumNoRecurse;
return true;
}
static bool setDoesNotThrow(Function &F) {
if (F.doesNotThrow())
return false;
F.setDoesNotThrow();
++NumNoUnwind;
return true;
}
static bool setDoesNotCapture(Function &F, unsigned n) {
if (F.doesNotCapture(n))
return false;
F.setDoesNotCapture(n);
++NumNoCapture;
return true;
}
static bool setOnlyReadsMemory(Function &F, unsigned n) {
if (F.onlyReadsMemory(n))
return false;
F.setOnlyReadsMemory(n);
++NumReadOnlyArg;
return true;
}
static bool setDoesNotAlias(Function &F, unsigned n) {
if (F.doesNotAlias(n))
return false;
F.setDoesNotAlias(n);
++NumNoAlias;
return true;
}
/// Analyze the name and prototype of the given function and set any applicable
/// attributes.
///
/// Returns true if any attributes were set and false otherwise.
static bool inferPrototypeAttributes(Function &F,
const TargetLibraryInfo &TLI) {
if (F.hasFnAttribute(Attribute::OptimizeNone))
return false;
FunctionType *FTy = F.getFunctionType();
LibFunc::Func TheLibFunc;
if (!(TLI.getLibFunc(F.getName(), TheLibFunc) && TLI.has(TheLibFunc)))
return false;
bool Changed = false;
switch (TheLibFunc) {
case LibFunc::strlen:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::strchr:
case LibFunc::strrchr:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isIntegerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::strtol:
case LibFunc::strtod:
case LibFunc::strtof:
case LibFunc::strtoul:
case LibFunc::strtoll:
case LibFunc::strtold:
case LibFunc::strtoull:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::strcpy:
case LibFunc::stpcpy:
case LibFunc::strcat:
case LibFunc::strncat:
case LibFunc::strncpy:
case LibFunc::stpncpy:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::strxfrm:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::strcmp: // 0,1
case LibFunc::strspn: // 0,1
case LibFunc::strncmp: // 0,1
case LibFunc::strcspn: // 0,1
case LibFunc::strcoll: // 0,1
case LibFunc::strcasecmp: // 0,1
case LibFunc::strncasecmp: //
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::strstr:
case LibFunc::strpbrk:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::strtok:
case LibFunc::strtok_r:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::setbuf:
case LibFunc::setvbuf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::strdup:
case LibFunc::strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::stat:
case LibFunc::statvfs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::sscanf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::sprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::snprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc::setitimer:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::system:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "system" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::malloc:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::memcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::memchr:
case LibFunc::memrchr:
if (FTy->getNumParams() != 3)
return false;
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::modf:
case LibFunc::modff:
case LibFunc::modfl:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::memcpy:
case LibFunc::memccpy:
case LibFunc::memmove:
if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::memalign:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::mkdir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::mktime:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::realloc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::read:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "read" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::rewind:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::rmdir:
case LibFunc::remove:
case LibFunc::realpath:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::rename:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::readlink:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::write:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "write" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::bcopy:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::bcmp:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::bzero:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotRecurse(F);
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::calloc:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::chmod:
case LibFunc::chown:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::ctermid:
case LibFunc::clearerr:
case LibFunc::closedir:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::atoi:
case LibFunc::atol:
case LibFunc::atof:
case LibFunc::atoll:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::access:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::fopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fdopen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::feof:
case LibFunc::free:
case LibFunc::fseek:
case LibFunc::ftell:
case LibFunc::fgetc:
case LibFunc::fseeko:
case LibFunc::ftello:
case LibFunc::fileno:
case LibFunc::fflush:
case LibFunc::fclose:
case LibFunc::fsetpos:
case LibFunc::flockfile:
case LibFunc::funlockfile:
case LibFunc::ftrylockfile:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::ferror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F);
return Changed;
case LibFunc::fputc:
case LibFunc::fstat:
case LibFunc::frexp:
case LibFunc::frexpf:
case LibFunc::frexpl:
case LibFunc::fstatvfs:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::fgets:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 3);
return Changed;
case LibFunc::fread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::fwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(3)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::fputs:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::fscanf:
case LibFunc::fprintf:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fgetpos:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::getc:
case LibFunc::getlogin_r:
case LibFunc::getc_unlocked:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::getenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setOnlyReadsMemory(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::gets:
case LibFunc::getchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::getitimer:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::getpwnam:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::ungetc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::uname:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::unlink:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::unsetenv:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::utime:
case LibFunc::utimes:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::puts:
case LibFunc::printf:
case LibFunc::perror:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::pread:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pread" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::pwrite:
if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
return false;
// May throw; "pwrite" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::putchar:
Changed |= setDoesNotThrow(F);
return Changed;
case LibFunc::popen:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::pclose:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::vscanf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::vsscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::vfscanf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::valloc:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::vprintf:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::vfprintf:
case LibFunc::vsprintf:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::vsnprintf:
if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(2)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 3);
Changed |= setOnlyReadsMemory(F, 3);
return Changed;
case LibFunc::open:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::opendir:
if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::tmpfile:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::times:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::htonl:
case LibFunc::htons:
case LibFunc::ntohl:
case LibFunc::ntohs:
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAccessMemory(F);
return Changed;
case LibFunc::lstat:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::lchown:
if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::qsort:
if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
return false;
// May throw; places call through function pointer.
Changed |= setDoesNotCapture(F, 4);
return Changed;
case LibFunc::dunder_strdup:
case LibFunc::dunder_strndup:
if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::dunder_strtok_r:
if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::under_IO_getc:
if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::under_IO_putc:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::dunder_isoc99_scanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::stat64:
case LibFunc::lstat64:
case LibFunc::statvfs64:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::dunder_isoc99_sscanf:
if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fopen64:
if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
Changed |= setOnlyReadsMemory(F, 1);
Changed |= setOnlyReadsMemory(F, 2);
return Changed;
case LibFunc::fseeko64:
case LibFunc::ftello64:
if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
return Changed;
case LibFunc::tmpfile64:
if (!FTy->getReturnType()->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotAlias(F, 0);
return Changed;
case LibFunc::fstat64:
case LibFunc::fstatvfs64:
if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
return false;
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 2);
return Changed;
case LibFunc::open64:
if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
return false;
// May throw; "open" is a valid pthread cancellation point.
Changed |= setDoesNotCapture(F, 1);
Changed |= setOnlyReadsMemory(F, 1);
return Changed;
case LibFunc::gettimeofday:
if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isPointerTy())
return false;
// Currently some platforms have the restrict keyword on the arguments to
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
// arguments.
Changed |= setDoesNotThrow(F);
Changed |= setDoesNotCapture(F, 1);
Changed |= setDoesNotCapture(F, 2);
return Changed;
default:
// FIXME: It'd be really nice to cover all the library functions we're
// aware of here.
return false;
}
}
static bool inferAllPrototypeAttributes(Module &M,
const TargetLibraryInfo &TLI) {
bool Changed = false;
for (Function &F : M.functions())
// When initially processing functions, also infer their prototype
// attributes if they are declarations.
if (F.isDeclaration())
Changed |= inferPrototypeAttributes(F, TLI);
return Changed;
}
PreservedAnalyses InferFunctionAttrsPass::run(Module &M,
AnalysisManager<Module> *AM) {
auto &TLI = AM->getResult<TargetLibraryAnalysis>(M);
if (!inferAllPrototypeAttributes(M, TLI))
// If we didn't infer everything, preserve all analyses.
return PreservedAnalyses::all();
probinsonUnsubmitted
Done
ReplyInline Actions

s/everything/anything/

probinson: s/everything/anything/
// Otherwise, we may have changed fundamental function attributes, so clear
// out all the passes.
return PreservedAnalyses::none();
}
namespace {
struct InferFunctionAttrsLegacyPass : public ModulePass {
static char ID; // Pass identification, replacement for typeid
InferFunctionAttrsLegacyPass() : ModulePass(ID) {
initializeInferFunctionAttrsLegacyPassPass(
*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<TargetLibraryInfoWrapperPass>();
}
bool runOnModule(Module &M) override {
auto &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
return inferAllPrototypeAttributes(M, TLI);
}
};
}
char InferFunctionAttrsLegacyPass::ID = 0;
INITIALIZE_PASS_BEGIN(InferFunctionAttrsLegacyPass, "inferattrs",
"Infer set function attributes", false, false)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_END(InferFunctionAttrsLegacyPass, "inferattrs",
"Infer set function attributes", false, false)
Pass *llvm::createInferFunctionAttrsLegacyPass() {
return new InferFunctionAttrsLegacyPass();
}

lib/Transforms/IPO/PassManagerBuilder.cpp

//===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===// //===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
// //
// The LLVM Compiler Infrastructure // The LLVM Compiler Infrastructure
// //
// This file is distributed under the University of Illinois Open Source // This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details. // License. See LICENSE.TXT for details.
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// //
// This file defines the PassManagerBuilder class, which is used to set up a // This file defines the PassManagerBuilder class, which is used to set up a
// "standard" optimization sequence suitable for languages like C and C++. // "standard" optimization sequence suitable for languages like C and C++.
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/PassManagerBuilder.h" #include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "llvm-c/Transforms/PassManagerBuilder.h" #include "llvm-c/Transforms/PassManagerBuilder.h"
#include "llvm/ADT/SmallVector.h" #include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/FunctionInfo.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Analysis/BasicAliasAnalysis.h" #include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/CFLAliasAnalysis.h" #include "llvm/Analysis/CFLAliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h" #include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ScopedNoAliasAA.h" #include "llvm/Analysis/ScopedNoAliasAA.h"
#include "llvm/Analysis/TargetLibraryInfo.h" #include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h" #include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/FunctionInfo.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/IPO.h" #include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/InferFunctionAttrs.h"
#include "llvm/Transforms/Scalar.h" #include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Vectorize.h" #include "llvm/Transforms/Vectorize.h"
using namespace llvm; using namespace llvm;
static cl::opt<bool> static cl::opt<bool>
RunLoopVectorization("vectorize-loops", cl::Hidden, RunLoopVectorization("vectorize-loops", cl::Hidden,
cl::desc("Run the Loop vectorization passes")); cl::desc("Run the Loop vectorization passes"));
▲ Show 20 Lines • Show All 169 Lines • ▼ Show 20 Linesvoid PassManagerBuilder::populateModulePassManager(
// Add LibraryInfo if we have some. // Add LibraryInfo if we have some.
if (LibraryInfo) if (LibraryInfo)
MPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo)); MPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));
addInitialAliasAnalysisPasses(MPM); addInitialAliasAnalysisPasses(MPM);
if (!DisableUnitAtATime) { if (!DisableUnitAtATime) {
// Infer attributes about declarations if possible.
MPM.add(createInferFunctionAttrsLegacyPass());
addExtensionsToPM(EP_ModuleOptimizerEarly, MPM); addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);
MPM.add(createIPSCCPPass()); // IP SCCP MPM.add(createIPSCCPPass()); // IP SCCP
MPM.add(createGlobalOptimizerPass()); // Optimize out global vars MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
// Promote any localized global vars // Promote any localized global vars
MPM.add(createPromoteMemoryToRegisterPass()); MPM.add(createPromoteMemoryToRegisterPass());
MPM.add(createDeadArgEliminationPass()); // Dead argument elimination MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
▲ Show 20 Lines • Show All 251 Lines • ▼ Show 20 Lines
void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) { void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
// Provide AliasAnalysis services for optimizations. // Provide AliasAnalysis services for optimizations.
addInitialAliasAnalysisPasses(PM); addInitialAliasAnalysisPasses(PM);
if (FunctionIndex) if (FunctionIndex)
PM.add(createFunctionImportPass(FunctionIndex)); PM.add(createFunctionImportPass(FunctionIndex));
// Infer attributes about declarations if possible.
PM.add(createInferFunctionAttrsLegacyPass());
// Propagate constants at call sites into the functions they call. This // Propagate constants at call sites into the functions they call. This
// opens opportunities for globalopt (and inlining) by substituting function // opens opportunities for globalopt (and inlining) by substituting function
// pointers passed as arguments to direct uses of functions. // pointers passed as arguments to direct uses of functions.
PM.add(createIPSCCPPass()); PM.add(createIPSCCPPass());
// Now that we internalized some globals, see if we can hack on them! // Now that we internalized some globals, see if we can hack on them!
PM.add(createFunctionAttrsPass()); // Add norecurse if possible. PM.add(createFunctionAttrsPass()); // Add norecurse if possible.
PM.add(createGlobalOptimizerPass()); PM.add(createGlobalOptimizerPass());
▲ Show 20 Lines • Show All 227 Lines • Show Last 20 Lines

test/Transforms/FunctionAttrs/2009-01-04-Annotate.ll

  • This file was deleted.
; RUN: opt < %s -functionattrs -S | FileCheck %s
; CHECK: declare noalias i8* @fopen(i8* nocapture readonly, i8* nocapture readonly) #0
declare i8* @fopen(i8*, i8*)
; CHECK: declare i8 @strlen(i8* nocapture) #1
declare i8 @strlen(i8*)
; CHECK: declare noalias i32* @realloc(i32* nocapture, i32) #0
declare i32* @realloc(i32*, i32)
; Test deliberately wrong declaration
declare i32 @strcpy(...)
; CHECK-NOT: strcpy{{.*}}noalias
; CHECK-NOT: strcpy{{.*}}nocapture
; CHECK-NOT: strcpy{{.*}}nounwind
; CHECK-NOT: strcpy{{.*}}readonly
; CHECK: attributes #0 = { nounwind }
; CHECK: attributes #1 = { nounwind readonly }

test/Transforms/FunctionAttrs/annotate-1.ll

  • This file was moved to test/Transforms/InferFunctionAttrs/annotate.ll.

test/Transforms/InferFunctionAttrs/annotate.ll

  • This file was moved from test/Transforms/FunctionAttrs/annotate-1.ll.
; RUN: opt < %s -functionattrs -S | FileCheck %s ; RUN: opt < %s -inferattrs -S | FileCheck %s
; RUN: opt < %s -mtriple=x86_64-apple-macosx10.8.0 -functionattrs -S | FileCheck -check-prefix=CHECK-POSIX %s ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.8.0 -inferattrs -S | FileCheck -check-prefix=CHECK-POSIX %s
declare i8* @fopen(i8*, i8*) declare i8* @fopen(i8*, i8*)
; CHECK: declare noalias i8* @fopen(i8* nocapture readonly, i8* nocapture readonly) [[G0:#[0-9]]] ; CHECK: declare noalias i8* @fopen(i8* nocapture readonly, i8* nocapture readonly) [[G0:#[0-9]]]
declare i8 @strlen(i8*) declare i8 @strlen(i8*)
; CHECK: declare i8 @strlen(i8* nocapture) [[G1:#[0-9]]] ; CHECK: declare i8 @strlen(i8* nocapture) [[G1:#[0-9]]]
declare i32* @realloc(i32*, i32) declare i32* @realloc(i32*, i32)
; CHECK: declare noalias i32* @realloc(i32* nocapture, i32) [[G0]] ; CHECK: declare noalias i32* @realloc(i32* nocapture, i32) [[G0]]
; Test deliberately wrong declaration ; Test deliberately wrong declaration
declare i32 @strcpy(...) declare i32 @strcpy(...)
; CHECK: declare i32 @strcpy(...) ; CHECK: declare i32 @strcpy(...)
declare i32 @gettimeofday(i8*, i8*) declare i32 @gettimeofday(i8*, i8*)
; CHECK-POSIX: declare i32 @gettimeofday(i8* nocapture, i8* nocapture) [[G0:#[0-9]+]] ; CHECK-POSIX: declare i32 @gettimeofday(i8* nocapture, i8* nocapture) [[G0:#[0-9]+]]
; CHECK: attributes [[G0]] = { nounwind } ; CHECK: attributes [[G0]] = { nounwind }
; CHECK: attributes [[G1]] = { nounwind readonly } ; CHECK: attributes [[G1]] = { norecurse nounwind readonly }
; CHECK-POSIX: attributes [[G0]] = { nounwind } ; CHECK-POSIX: attributes [[G0]] = { nounwind }

test/Transforms/InstCombine/strto-1.ll

; Test that the strto* library call simplifiers works correctly. ; Test that the strto* library call simplifiers works correctly.
; ;
; RUN: opt < %s -instcombine -functionattrs -S | FileCheck %s ; RUN: opt < %s -instcombine -inferattrs -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
declare i64 @strtol(i8* %s, i8** %endptr, i32 %base) declare i64 @strtol(i8* %s, i8** %endptr, i32 %base)
; CHECK: declare i64 @strtol(i8* readonly, i8** nocapture, i32) ; CHECK: declare i64 @strtol(i8* readonly, i8** nocapture, i32)
declare double @strtod(i8* %s, i8** %endptr, i32 %base) declare double @strtod(i8* %s, i8** %endptr, i32 %base)
; CHECK: declare double @strtod(i8* readonly, i8** nocapture, i32) ; CHECK: declare double @strtod(i8* readonly, i8** nocapture, i32)
▲ Show 20 Lines • Show All 71 Lines • Show Last 20 Lines
lib/Transforms/IPO/PassManagerBuilder.cpp