[lld] r265053 - ELF: Add flag for controlling LTO optimization level.
Peter Collingbourne via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 31 14:00:28 PDT 2016
Author: pcc
Date: Thu Mar 31 16:00:27 2016
New Revision: 265053
URL: http://llvm.org/viewvc/llvm-project?rev=265053&view=rev
Log:
ELF: Add flag for controlling LTO optimization level.
Differential Revision: http://reviews.llvm.org/D18667
Added:
lld/trunk/test/ELF/lto/opt-level.ll
Modified:
lld/trunk/ELF/Config.h
lld/trunk/ELF/Driver.cpp
lld/trunk/ELF/LTO.cpp
lld/trunk/ELF/Options.td
Modified: lld/trunk/ELF/Config.h
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Config.h?rev=265053&r1=265052&r2=265053&view=diff
==============================================================================
--- lld/trunk/ELF/Config.h (original)
+++ lld/trunk/ELF/Config.h Thu Mar 31 16:00:27 2016
@@ -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;
};
Modified: lld/trunk/ELF/Driver.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Driver.cpp?rev=265053&r1=265052&r2=265053&view=diff
==============================================================================
--- lld/trunk/ELF/Driver.cpp (original)
+++ lld/trunk/ELF/Driver.cpp Thu Mar 31 16:00:27 2016
@@ -282,6 +282,12 @@ void LinkerDriver::readConfigs(opt::Inpu
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") {
Modified: lld/trunk/ELF/LTO.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/LTO.cpp?rev=265053&r1=265052&r2=265053&view=diff
==============================================================================
--- lld/trunk/ELF/LTO.cpp (original)
+++ lld/trunk/ELF/LTO.cpp Thu Mar 31 16:00:27 2016
@@ -62,7 +62,7 @@ static void runLTOPasses(Module &M, Targ
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);
Modified: lld/trunk/ELF/Options.td
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Options.td?rev=265053&r1=265052&r2=265053&view=diff
==============================================================================
--- lld/trunk/ELF/Options.td (original)
+++ lld/trunk/ELF/Options.td Thu Mar 31 16:00:27 2016
@@ -75,6 +75,9 @@ def init : Separate<["-"], "init">, Meta
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">;
Added: lld/trunk/test/ELF/lto/opt-level.ll
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/lto/opt-level.ll?rev=265053&view=auto
==============================================================================
--- lld/trunk/test/ELF/lto/opt-level.ll (added)
+++ lld/trunk/test/ELF/lto/opt-level.ll Thu Mar 31 16:00:27 2016
@@ -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
+}
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