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Support "preserving" the summary information when using setModule() API in LTOCodeGenerator

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Another attempt at r267655...

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 267665
This commit is contained in:
Mehdi Amini 2016-04-27 04:24:10 +00:00
parent 4c94cd20e1
commit 6e6426ce69
3 changed files with 46 additions and 1 deletions
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1
include/llvm/LTO/LTOCodeGenerator.h
View File

@ -201,6 +201,7 @@ private:
LLVMContext &Context;
std::unique_ptr<Module> MergedModule;
bool MainModuleHasSummary = false;
std::unique_ptr<Linker> TheLinker;
std::unique_ptr<TargetMachine> TargetMach;
bool EmitDwarfDebugInfo = false;

9
lib/LTO/LTOCodeGenerator.cpp
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@ -18,6 +18,7 @@
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ModuleSummaryAnalysis.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Bitcode/ReaderWriter.h"
@ -145,6 +146,7 @@ void LTOCodeGenerator::setModule(std::unique_ptr<LTOModule> Mod) {
MergedModule = Mod->takeModule();
TheLinker = make_unique<Linker>(*MergedModule);
MainModuleHasSummary = Mod->isThinLTO();
const std::vector<const char*> &Undefs = Mod->getAsmUndefinedRefs();
for (int I = 0, E = Undefs.size(); I != E; ++I)
@ -209,8 +211,13 @@ bool LTOCodeGenerator::writeMergedModules(const char *Path) {
return false;
}
std::unique_ptr<ModuleSummaryIndex> Index;
if (MainModuleHasSummary)
Index = ModuleSummaryIndexBuilder(MergedModule.get()).takeIndex();
// write bitcode to it
WriteBitcodeToFile(MergedModule.get(), Out.os(), ShouldEmbedUselists);
WriteBitcodeToFile(MergedModule.get(), Out.os(), ShouldEmbedUselists,
Index.get());
Out.os().close();
if (Out.os().has_error()) {

37
test/LTO/X86/set-merged-thin.ll Normal file
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@ -0,0 +1,37 @@
; RUN: opt -module-summary < %s > %t1
; RUN: llvm-lto -save-merged-module -exported-symbol=_main -set-merged-module -o %t2 %t1
; RUN: llvm-bcanalyzer -dump %t2.merged.bc | FileCheck %s
; Verify that the module includes the ThinLTO summary
; CHECK: <PERMODULE
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.10.0"
define i32 @_Z3fooi(i32 %a) {
entry:
%a.addr = alloca i32, align 4
store i32 %a, i32* %a.addr, align 4
%0 = load i32, i32* %a.addr, align 4
%1 = load i32, i32* %a.addr, align 4
%call = call i32 @_Z4bar2i(i32 %1)
%add = add nsw i32 %0, %call
ret i32 %add
}
define i32 @_Z4bar2i(i32 %a) {
entry:
%a.addr = alloca i32, align 4
store i32 %a, i32* %a.addr, align 4
%0 = load i32, i32* %a.addr, align 4
%mul = mul nsw i32 2, %0
ret i32 %mul
}
define i32 @main() {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval
%call = call i32 @_Z3fooi(i32 44)
ret i32 %call
}