maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

ELF: Add flag for controlling LTO optimization level. 

Differential Revision: http://reviews.llvm.org/D18667

llvm-svn: 265053
This commit is contained in:
Peter Collingbourne 2016-03-31 21:00:27 +00:00
parent 326014ad99
commit ed22f9b6f1
5 changed files with 32 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lld/ELF/Config.h
View File

@ -90,6 +90,7 @@ struct Configuration {
ELFKind EKind = ELFNoneKind;
uint16_t EMachine = llvm::ELF::EM_NONE;
uint64_t EntryAddr = -1;
unsigned LtoO = 2;
unsigned Optimize = 0;
};

6
lld/ELF/Driver.cpp
View File

@ -282,6 +282,12 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
error("invalid optimization level");
}
if (auto *Arg = Args.getLastArg(OPT_lto_O)) {
StringRef Val = Arg->getValue();
if (Val.getAsInteger(10, Config->LtoO))
error("invalid optimization level");
}
if (auto *Arg = Args.getLastArg(OPT_hash_style)) {
StringRef S = Arg->getValue();
if (S == "gnu") {

2
lld/ELF/LTO.cpp
View File

@ -62,7 +62,7 @@ static void runLTOPasses(Module &M, TargetMachine &TM) {
PMB.VerifyOutput = true;
PMB.LoopVectorize = true;
PMB.SLPVectorize = true;
PMB.OptLevel = 2; // FIXME: This should be an option.
PMB.OptLevel = Config->LtoO;
PMB.populateLTOPassManager(LtoPasses);
LtoPasses.run(M);

3
lld/ELF/Options.td
View File

@ -75,6 +75,9 @@ def init : Separate<["-"], "init">, MetaVarName<"<symbol>">,
def l : JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
HelpText<"Root name of library to use">;
def lto_O : Joined<["--"], "lto-O">, MetaVarName<"<opt-level>">,
HelpText<"Optimization level for LTO">;
def m : JoinedOrSeparate<["-"], "m">,
HelpText<"Set target emulation">;

21
lld/test/ELF/lto/opt-level.ll Normal file
View File

@ -0,0 +1,21 @@
; RUN: llvm-as -o %t.o %s
; RUN: ld.lld -o %t0 -m elf_x86_64 -e main --lto-O0 %t.o
; RUN: llvm-nm %t0 | FileCheck --check-prefix=CHECK-O0 %s
; RUN: ld.lld -o %t2 -m elf_x86_64 -e main --lto-O2 %t.o
; RUN: llvm-nm %t2 | FileCheck --check-prefix=CHECK-O2 %s
; RUN: ld.lld -o %t2a -m elf_x86_64 -e main %t.o
; RUN: llvm-nm %t2a | FileCheck --check-prefix=CHECK-O2 %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; CHECK-O0: foo
; CHECK-O2-NOT: foo
define internal void @foo() {
ret void
}
define void @main() {
call void @foo()
ret void
}