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libLTO, llvm-lto, gold: Introduce flag for controlling optimization level.

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This change also introduces a link-time optimization level of 1. This
optimization level runs only the globaldce pass as well as cleanup passes for
passes that run at -O0, specifically simplifycfg which cleans up lowerbitsets.

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266951.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2015-03-19 22:01:00 +00:00
parent 0dda07ad4d
commit 416d8ecf80
10 changed files with 151 additions and 53 deletions
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7
include/llvm/LTO/LTOCodeGenerator.h
View File

@ -76,6 +76,7 @@ struct LTOCodeGenerator {
void setCpu(const char *mCpu) { MCpu = mCpu; }
void setAttr(const char *mAttr) { MAttr = mAttr; }
void setOptLevel(unsigned optLevel) { OptLevel = optLevel; }
void addMustPreserveSymbol(const char *sym) { MustPreserveSymbols[sym] = 1; }
@ -102,7 +103,6 @@ struct LTOCodeGenerator {
// Do not try to remove the object file in LTOCodeGenerator's destructor
// as we don't who (LTOCodeGenerator or the obj file) will last longer.
bool compile_to_file(const char **name,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
@ -114,15 +114,13 @@ struct LTOCodeGenerator {
// caller. This function should delete intermediate object file once its content
// is brought to memory. Return NULL if the compilation was not successful.
const void *compile(size_t *length,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg);
// Optimizes the merged module. Returns true on success.
bool optimize(bool disableOpt,
bool disableInline,
bool optimize(bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg);
@ -171,6 +169,7 @@ private:
std::string MAttr;
std::string NativeObjectPath;
TargetOptions Options;
unsigned OptLevel;
lto_diagnostic_handler_t DiagHandler;
void *DiagContext;
LTOModule *OwnedModule;

1
include/llvm/Transforms/IPO/PassManagerBuilder.h
View File

@ -140,6 +140,7 @@ private:
legacy::PassManagerBase &PM) const;
void addInitialAliasAnalysisPasses(legacy::PassManagerBase &PM) const;
void addLTOOptimizationPasses(legacy::PassManagerBase &PM);
void addLateLTOOptimizationPasses(legacy::PassManagerBase &PM);
public:
/// populateFunctionPassManager - This fills in the function pass manager,

32
lib/LTO/LTOCodeGenerator.cpp
View File

@ -71,7 +71,7 @@ LTOCodeGenerator::LTOCodeGenerator()
LTOCodeGenerator::LTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
: OwnedContext(std::move(Context)), Context(*OwnedContext),
IRLinker(new Module("ld-temp.o", *OwnedContext)) {
IRLinker(new Module("ld-temp.o", *OwnedContext)), OptLevel(2) {
initialize();
}
@ -291,12 +291,11 @@ const void *LTOCodeGenerator::compileOptimized(size_t *length,
bool LTOCodeGenerator::compile_to_file(const char **name,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg) {
if (!optimize(disableOpt, disableInline, disableGVNLoadPRE,
if (!optimize(disableInline, disableGVNLoadPRE,
disableVectorization, errMsg))
return false;
@ -304,12 +303,11 @@ bool LTOCodeGenerator::compile_to_file(const char **name,
}
const void* LTOCodeGenerator::compile(size_t *length,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg) {
if (!optimize(disableOpt, disableInline, disableGVNLoadPRE,
if (!optimize(disableInline, disableGVNLoadPRE,
disableVectorization, errMsg))
return nullptr;
@ -363,9 +361,25 @@ bool LTOCodeGenerator::determineTarget(std::string &errMsg) {
MCpu = "cyclone";
}
CodeGenOpt::Level CGOptLevel;
switch (OptLevel) {
case 0:
CGOptLevel = CodeGenOpt::None;
break;
case 1:
CGOptLevel = CodeGenOpt::Less;
break;
case 2:
CGOptLevel = CodeGenOpt::Default;
break;
case 3:
CGOptLevel = CodeGenOpt::Aggressive;
break;
}
TargetMach = march->createTargetMachine(TripleStr, MCpu, FeatureStr, Options,
RelocModel, CodeModel::Default,
CodeGenOpt::Aggressive);
CGOptLevel);
return true;
}
@ -512,8 +526,7 @@ void LTOCodeGenerator::applyScopeRestrictions() {
}
/// Optimize merged modules using various IPO passes
bool LTOCodeGenerator::optimize(bool DisableOpt,
bool DisableInline,
bool LTOCodeGenerator::optimize(bool DisableInline,
bool DisableGVNLoadPRE,
bool DisableVectorization,
std::string &errMsg) {
@ -542,8 +555,7 @@ bool LTOCodeGenerator::optimize(bool DisableOpt,
if (!DisableInline)
PMB.Inliner = createFunctionInliningPass();
PMB.LibraryInfo = new TargetLibraryInfoImpl(TargetTriple);
if (DisableOpt)
PMB.OptLevel = 0;
PMB.OptLevel = OptLevel;
PMB.VerifyInput = true;
PMB.VerifyOutput = true;

16
lib/Transforms/IPO/PassManagerBuilder.cpp
View File

@ -491,10 +491,10 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
addExtensionsToPM(EP_Peephole, PM);
PM.add(createJumpThreadingPass());
}
// Lower bitset metadata to bitsets.
PM.add(createLowerBitSetsPass());
void PassManagerBuilder::addLateLTOOptimizationPasses(
legacy::PassManagerBase &PM) {
// Delete basic blocks, which optimization passes may have killed.
PM.add(createCFGSimplificationPass());
@ -516,9 +516,17 @@ void PassManagerBuilder::populateLTOPassManager(legacy::PassManagerBase &PM) {
PM.add(createDebugInfoVerifierPass());
}
if (OptLevel != 0)
if (OptLevel > 1)
addLTOOptimizationPasses(PM);
// Lower bit sets to globals. This pass supports Clang's control flow
// integrity mechanisms (-fsanitize=cfi*) and needs to run at link time if CFI
// is enabled. The pass does nothing if CFI is disabled.
PM.add(createLowerBitSetsPass());
if (OptLevel != 0)
addLateLTOOptimizationPasses(PM);
if (VerifyOutput) {
PM.add(createVerifierPass());
PM.add(createDebugInfoVerifierPass());

2
test/LTO/X86/cfi_endproc.ll
View File

@ -25,7 +25,7 @@ define i32 @main(i32 %argc, i8** %argv) {
ret i32 0
}
; RUN: llvm-lto -o %t -dso-symbol=zed1 -dso-symbol=zed2 %t1 -disable-opt
; RUN: llvm-lto -o %t -dso-symbol=zed1 -dso-symbol=zed2 %t1 -O0
; RUN: llvm-nm %t | FileCheck %s -check-prefix=ZED1_AND_ZED2
; ZED1_AND_ZED2: V zed1
@zed1 = linkonce_odr global i32 42

2
test/LTO/X86/linkonce_odr_func.ll
View File

@ -1,6 +1,6 @@
; RUN: llvm-as < %s >%t1
; RUN: llvm-lto -o %t2 -dso-symbol=foo1 -dso-symbol=foo2 -dso-symbol=foo3 \
; RUN: -dso-symbol=foo4 -dso-symbol=v1 -dso-symbol=v2 %t1 -disable-opt
; RUN: -dso-symbol=foo4 -dso-symbol=v1 -dso-symbol=v2 %t1 -O0
; RUN: llvm-nm %t2 | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"

50
test/tools/gold/opt-level.ll Normal file
View File

@ -0,0 +1,50 @@
; RUN: llvm-as -o %t.bc %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold.so -plugin-opt=save-temps \
; RUN: -plugin-opt=O0 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.opt.bc -o - | FileCheck --check-prefix=CHECK-O0 %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold.so -plugin-opt=save-temps \
; RUN: -plugin-opt=O1 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.opt.bc -o - | FileCheck --check-prefix=CHECK-O1 %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold.so -plugin-opt=save-temps \
; RUN: -plugin-opt=O2 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.opt.bc -o - | FileCheck --check-prefix=CHECK-O2 %s
; CHECK-O0: define internal void @foo(
; CHECK-O1: define internal void @foo(
; CHECK-O2-NOT: define internal void @foo(
define internal void @foo() {
ret void
}
; CHECK-O0: define internal i32 @bar(
; CHECK-O1: define internal i32 @bar(
define internal i32 @bar(i1 %p) {
br i1 %p, label %t, label %f
t:
br label %end
f:
br label %end
end:
; CHECK-O0: phi
; CHECK-O1: select
%r = phi i32 [ 1, %t ], [ 2, %f ]
ret i32 %r
}
define void @baz() {
call void @foo()
%c = call i32 @bar(i1 true)
ret void
}
@a = constant i32 1
!0 = !{!"bitset1", i32* @a, i32 0}
; CHECK-O0-NOT: llvm.bitsets
; CHECK-O1-NOT: llvm.bitsets
; CHECK-O2-NOT: llvm.bitsets
!llvm.bitsets = !{ !0 }

23
tools/gold/gold-plugin.cpp
View File

@ -91,6 +91,7 @@ namespace options {
};
static bool generate_api_file = false;
static OutputType TheOutputType = OT_NORMAL;
static unsigned OptLevel = 2;
static std::string obj_path;
static std::string extra_library_path;
static std::string triple;
@ -124,6 +125,10 @@ namespace options {
TheOutputType = OT_SAVE_TEMPS;
} else if (opt == "disable-output") {
TheOutputType = OT_DISABLE;
} else if (opt.size() == 2 && opt[0] == 'O') {
if (opt[1] < '0' || opt[1] > '3')
report_fatal_error("Optimization level must be between 0 and 3");
OptLevel = opt[1] - '0';
} else {
// Save this option to pass to the code generator.
// ParseCommandLineOptions() expects argv[0] to be program name. Lazily
@ -724,6 +729,7 @@ static void runLTOPasses(Module &M, TargetMachine &TM) {
PMB.VerifyOutput = true;
PMB.LoopVectorize = true;
PMB.SLPVectorize = true;
PMB.OptLevel = options::OptLevel;
PMB.populateLTOPassManager(passes);
passes.run(M);
}
@ -754,9 +760,24 @@ static void codegen(Module &M) {
Features.AddFeature(A);
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
CodeGenOpt::Level CGOptLevel;
switch (options::OptLevel) {
case 0:
CGOptLevel = CodeGenOpt::None;
break;
case 1:
CGOptLevel = CodeGenOpt::Less;
break;
case 2:
CGOptLevel = CodeGenOpt::Default;
break;
case 3:
CGOptLevel = CodeGenOpt::Aggressive;
break;
}
std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
CodeModel::Default, CodeGenOpt::Aggressive));
CodeModel::Default, CGOptLevel));
runLTOPasses(M, *TM);

21
tools/llvm-lto/llvm-lto.cpp
View File

@ -26,9 +26,13 @@
using namespace llvm;
static cl::opt<bool>
DisableOpt("disable-opt", cl::init(false),
cl::desc("Do not run any optimization passes"));
static cl::opt<char>
OptLevel("O",
cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
"(default = '-O2')"),
cl::Prefix,
cl::ZeroOrMore,
cl::init('2'));
static cl::opt<bool>
DisableInline("disable-inlining", cl::init(false),
@ -146,6 +150,11 @@ int main(int argc, char **argv) {
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
if (OptLevel < '0' || OptLevel > '3') {
errs() << argv[0] << ": optimization level must be between 0 and 3\n";
return 1;
}
// Initialize the configured targets.
InitializeAllTargets();
InitializeAllTargetMCs();
@ -231,6 +240,8 @@ int main(int argc, char **argv) {
// Set cpu and attrs strings for the default target/subtarget.
CodeGen.setCpu(MCPU.c_str());
CodeGen.setOptLevel(OptLevel - '0');
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
@ -245,7 +256,7 @@ int main(int argc, char **argv) {
size_t len = 0;
std::string ErrorInfo;
const void *Code =
CodeGen.compile(&len, DisableOpt, DisableInline, DisableGVNLoadPRE,
CodeGen.compile(&len, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, ErrorInfo);
if (!Code) {
errs() << argv[0]
@ -265,7 +276,7 @@ int main(int argc, char **argv) {
} else {
std::string ErrorInfo;
const char *OutputName = nullptr;
if (!CodeGen.compile_to_file(&OutputName, DisableOpt, DisableInline,
if (!CodeGen.compile_to_file(&OutputName, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
ErrorInfo)) {
errs() << argv[0]

50
tools/lto/lto.cpp
View File

@ -23,9 +23,13 @@
#include "llvm/Support/TargetSelect.h"
// extra command-line flags needed for LTOCodeGenerator
static cl::opt<bool>
DisableOpt("disable-opt", cl::init(false),
cl::desc("Do not run any optimization passes"));
static cl::opt<char>
OptLevel("O",
cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
"(default = '-O2')"),
cl::Prefix,
cl::ZeroOrMore,
cl::init('2'));
static cl::opt<bool>
DisableInline("disable-inlining", cl::init(false),
@ -85,6 +89,10 @@ static void lto_add_attrs(lto_code_gen_t cg) {
CG->setAttr(attrs.c_str());
}
if (OptLevel < '0' || OptLevel > '3')
report_fatal_error("Optimization level must be between 0 and 3");
CG->setOptLevel(OptLevel - '0');
}
extern const char* lto_get_version() {
@ -281,54 +289,42 @@ void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
unwrap(cg)->addMustPreserveSymbol(symbol);
}
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
static void maybeParseOptions() {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
}
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
maybeParseOptions();
return !unwrap(cg)->writeMergedModules(path, sLastErrorString);
}
const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return unwrap(cg)->compile(length, DisableOpt, DisableInline,
maybeParseOptions();
return unwrap(cg)->compile(length, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
sLastErrorString);
}
bool lto_codegen_optimize(lto_code_gen_t cg) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
return !unwrap(cg)->optimize(DisableOpt, DisableInline,
maybeParseOptions();
return !unwrap(cg)->optimize(DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
sLastErrorString);
}
const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
maybeParseOptions();
return unwrap(cg)->compileOptimized(length, sLastErrorString);
}
bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
maybeParseOptions();
return !unwrap(cg)->compile_to_file(
name, DisableOpt, DisableInline, DisableGVNLoadPRE,
name, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, sLastErrorString);
}