[PATCH] D18667: ELF: Add flag for controlling LTO optimization level.
Peter Collingbourne via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 31 12:49:00 PDT 2016
pcc created this revision.
pcc added reviewers: rafael, ruiu.
pcc added a subscriber: llvm-commits.
Herald added a subscriber: joker.eph.
http://reviews.llvm.org/D18667
Files:
ELF/Config.h
ELF/Driver.cpp
ELF/LTO.cpp
ELF/Options.td
test/ELF/lto/opt-level.ll
Index: test/ELF/lto/opt-level.ll
===================================================================
--- /dev/null
+++ test/ELF/lto/opt-level.ll
@@ -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
+}
Index: ELF/Options.td
===================================================================
--- ELF/Options.td
+++ ELF/Options.td
@@ -75,6 +75,9 @@
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">;
Index: ELF/LTO.cpp
===================================================================
--- ELF/LTO.cpp
+++ ELF/LTO.cpp
@@ -52,7 +52,7 @@
// Run LTO passes.
// Note that the gold plugin has a similar piece of code, so
// it is probably better to move this code to a common place.
-static void runLTOPasses(Module &M, TargetMachine &TM) {
+static void runLTOPasses(Module &M, TargetMachine &TM, unsigned OptLevel) {
legacy::PassManager LtoPasses;
LtoPasses.add(createTargetTransformInfoWrapperPass(TM.getTargetIRAnalysis()));
PassManagerBuilder PMB;
@@ -62,7 +62,7 @@
PMB.VerifyOutput = true;
PMB.LoopVectorize = true;
PMB.SLPVectorize = true;
- PMB.OptLevel = 2; // FIXME: This should be an option.
+ PMB.OptLevel = OptLevel;
PMB.populateLTOPassManager(LtoPasses);
LtoPasses.run(M);
@@ -146,7 +146,7 @@
saveBCFile(Combined, ".lto.bc");
std::unique_ptr<TargetMachine> TM(getTargetMachine());
- runLTOPasses(Combined, *TM);
+ runLTOPasses(Combined, *TM, Config->LTOOptLevel);
raw_svector_ostream OS(OwningData);
legacy::PassManager CodeGenPasses;
Index: ELF/Driver.cpp
===================================================================
--- ELF/Driver.cpp
+++ ELF/Driver.cpp
@@ -280,6 +280,12 @@
error("invalid optimization level");
}
+ if (auto *Arg = Args.getLastArg(OPT_lto_O)) {
+ StringRef Val = Arg->getValue();
+ if (Val.getAsInteger(10, Config->LTOOptLevel))
+ error("invalid optimization level");
+ }
+
if (auto *Arg = Args.getLastArg(OPT_hash_style)) {
StringRef S = Arg->getValue();
if (S == "gnu") {
Index: ELF/Config.h
===================================================================
--- ELF/Config.h
+++ ELF/Config.h
@@ -91,6 +91,7 @@
uint16_t EMachine = llvm::ELF::EM_NONE;
uint64_t EntryAddr = -1;
unsigned Optimize = 0;
+ unsigned LTOOptLevel = 2;
};
// The only instance of Configuration struct.
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