[ThinLTO] Move -lto-use-new-pm to llvm-lto2, and change it to -use-ne…

…w-pm.

Summary:
As we teach Clang to use ThinkLTO + new PM, it's good for the users to
inject through Config, instead of setting a flag in the LTOBackend
library. Move the flag to llvm-lto2.

As it moves to llvm-lto2, a new name -use-new-pm seems simpler and as
clear.

Reviewers: davide, tejohnson

Subscribers: mehdi_amini, Prazek, inglorion, eraman, chandlerc, llvm-commits

Differential Revision: https://reviews.llvm.org/D33799

llvm-svn: 304492

llvm/include/llvm/LTO/Config.h

@@ -46,6 +46,9 @@ struct Config {
   unsigned OptLevel = 2;
   bool DisableVerify = false;
 
+  /// Use the new pass manager
+  bool UseNewPM = false;
+
   /// Disable entirely the optimizer, including importing for ThinLTO
   bool CodeGenOnly = false;
 

llvm/lib/LTO/LTO.cpp

@@ -122,6 +122,7 @@ static void computeCacheKey(
   AddUnsigned(Conf.CGOptLevel);
   AddUnsigned(Conf.CGFileType);
   AddUnsigned(Conf.OptLevel);
+  AddUnsigned(Conf.UseNewPM);
   AddString(Conf.OptPipeline);
   AddString(Conf.AAPipeline);
   AddString(Conf.OverrideTriple);

llvm/lib/LTO/LTOBackend.cpp

@@ -42,11 +42,6 @@
 using namespace llvm;
 using namespace lto;
 
-static cl::opt<bool>
-    LTOUseNewPM("lto-use-new-pm",
-                cl::desc("Run LTO passes using the new pass manager"),
-                cl::init(false), cl::Hidden);
-
 LLVM_ATTRIBUTE_NORETURN static void reportOpenError(StringRef Path, Twine Msg) {
   errs() << "failed to open " << Path << ": " << Msg << '\n';
   errs().flush();
@@ -266,7 +261,7 @@ bool opt(Config &Conf, TargetMachine *TM, unsigned Task, Module &Mod,
   if (!Conf.OptPipeline.empty())
     runNewPMCustomPasses(Mod, TM, Conf.OptPipeline, Conf.AAPipeline,
                          Conf.DisableVerify);
-  else if (LTOUseNewPM)
+  else if (Conf.UseNewPM)
     runNewPMPasses(Mod, TM, Conf.OptLevel, IsThinLTO);
   else
     runOldPMPasses(Conf, Mod, TM, IsThinLTO, ExportSummary, ImportSummary);

llvm/test/ThinLTO/X86/newpm-basic.ll

@@ -1,7 +1,7 @@
 ; RUN: opt -module-summary %s -o %t1.bc
 ; RUN: llvm-lto2 run %t1.bc -o %t.o \
 ; RUN:     -r=%t1.bc,_tinkywinky,pxl \
-; RUN:     -lto-use-new-pm
+; RUN:     -use-new-pm
 
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.11.0"

llvm/test/tools/llvm-lto2/X86/pipeline.ll

@@ -8,7 +8,7 @@
 
 ; Try the new pass manager LTO default pipeline (make sure the option
 ; is accepted).
-; RUN: llvm-lto2 run %t1.bc -o %t.o -lto-use-new-pm -r %t1.bc,patatino,px
+; RUN: llvm-lto2 run %t1.bc -o %t.o -use-new-pm -r %t1.bc,patatino,px
 
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"

llvm/tools/llvm-lto2/llvm-lto2.cpp

@@ -99,6 +99,11 @@ static cl::opt<bool> OptRemarksWithHotness(
     cl::desc("Whether to include hotness informations in the remarks.\n"
              "Has effect only if -pass-remarks-output is specified."));
 
+static cl::opt<bool>
+    UseNewPM("use-new-pm",
+             cl::desc("Run LTO passes using the new pass manager"),
+             cl::init(false), cl::Hidden);
+
 static void check(Error E, std::string Msg) {
   if (!E)
     return;
@@ -196,6 +201,7 @@ static int run(int argc, char **argv) {
   Conf.AAPipeline = AAPipeline;
 
   Conf.OptLevel = OptLevel - '0';
+  Conf.UseNewPM = UseNewPM;
   switch (CGOptLevel) {
   case '0':
     Conf.CGOptLevel = CodeGenOpt::None;
@@ -351,7 +357,7 @@ int main(int argc, char **argv) {
 
   // FIXME: This should use llvm::cl subcommands, but it isn't currently
   // possible to pass an argument not associated with a subcommand to a
-  // subcommand (e.g. -lto-use-new-pm).
+  // subcommand (e.g. -use-new-pm).
   if (argc < 2)
     return usage();