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[LTO/Thin] Make the number of threads to run in the BE configurable. 

Before the default was whatever number hardware_concurrency() returned.
Users can specify the number of threads via --lto-jobs=X option.

llvm-svn: 283787
This commit is contained in:
Davide Italiano 2016-10-10 18:12:53 +00:00
parent b224c048b4
commit 7a7b35ae3b
3 changed files with 39 additions and 1 deletions
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4
lld/ELF/LTO.cpp
View File

@ -49,7 +49,6 @@ static void checkError(Error E) {
static std::unique_ptr<lto::LTO> createLTO() {
lto::Config Conf;
lto::ThinBackend Backend;
// LLD supports the new relocations.
Conf.Options = InitTargetOptionsFromCodeGenFlags();
@ -68,6 +67,9 @@ static std::unique_ptr<lto::LTO> createLTO() {
checkError(Conf.addSaveTemps(std::string(Config->OutputFile) + ".",
/*UseInputModulePath*/ true));
lto::ThinBackend Backend;
if (Config->LtoJobs)
Backend = lto::createInProcessThinBackend(Config->LtoJobs);
return llvm::make_unique<lto::LTO>(std::move(Conf), Backend, Config->LtoJobs);
}

7
lld/test/ELF/lto/Inputs/thinlto.ll Normal file
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@ -0,0 +1,7 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @g() {
entry:
ret void
}

29
lld/test/ELF/lto/thinlto.ll Normal file
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@ -0,0 +1,29 @@
; Basic ThinLTO tests.
; RUN: llvm-as %s -o %t.o
; RUN: llvm-as %p/Inputs/thinlto.ll -o %t2.o
; First force single-threaded mode
; RUN: ld.lld -save-temps --lto-jobs=1 -shared %t.o %t2.o -o %t
; RUN: llvm-nm %t.lto.o | FileCheck %s --check-prefix=NM
; NM: T f
; NM: T g
; Next force multi-threaded mode
; RUN: ld.lld -save-temps --lto-jobs=2 -shared %t.o %t2.o -o %t2
; RUN: llvm-nm %t20.lto.o | FileCheck %s --check-prefix=NM1
; RUN: llvm-nm %t21.lto.o | FileCheck %s --check-prefix=NM2
; NM1: T g
; NM2: T f
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @g(...)
define void @f() {
entry:
call void (...) @g()
ret void
}