[Remarks] Add -foptimization-record-passes to filter remark emission

[thegameg]

Summary

Currently we have -Rpass for filtering the remarks that are displayed as diagnostics, but when using -fsave-optimization-record, there is no way to filter the remarks while generating them.

This adds support for filtering remarks by passes using a regex.

Ex:

clang -fsave-optimization-record -foptimization-record-passes=inline

will only emit the remarks coming from the pass inline.

This adds:

• -fsave-optimization-record to the driver
• -opt-record-passes to cc1
• -lto-pass-remarks-passes to the LTOCodeGenerator
• --opt-remarks-passes to lld
• -pass-remarks-passes to llc, opt, llvm-lto, llvm-lto2
• -opt-remarks-passes to gold-plugin

The naming is chosen to be consistent with the output filename.

[paquette]

Awesome!

The code LGTM. I have a few minor nits, which are mostly personal taste.

clang/include/clang/Driver/CC1Options.td

607

This is kind of clunky IMO

Maybe like

"Only record remark information for passes whose names match the given regular expression"

clang/include/clang/Driver/Options.td

1720

"Only include passes which match a specified regular expression in the generated optimization record"

Also, maybe we should make it clear that the default behaviour is to include all passes?

clang/test/CodeGen/opt-record-MIR.c

27

Not hugely critical, but can we avoid explicit line numbers in these tests? I think it's kind of flaky. It would be nice to have remarks tests be robust against unrelated changes as much as possible.

llvm/test/CodeGen/AArch64/machine-outliner-size-info.mir has an example of how you can combine the YAML output and standard remark output.

llvm/lib/IR/RemarkStreamer.cpp

35–37

Maybe we should keep track of the number of passes we matched? If it's 0, then we can emit a warning saying that we didn't match anything.

I can imagine people misspelling pass names/writing bad regexes etc and maybe wanting this information.

I guess that could be done in a follow-up though.

llvm/lib/LTO/LTOCodeGenerator.cpp

91

Why is this cl::desc different from the others?

llvm/tools/gold/gold-plugin.cpp

210

I feel like if I didn't know anything about this, I would assume that this defaults to all passes.

Maybe OptRemarksFilter would be a better name?

llvm/tools/llc/llc.cpp

152

Maybe "-pass-remarks-only" or "pass-remarks-filter" instead of "passes"?

This is a matter of personal taste though, so I won't be offended if you leave it as is.

153

The other remarks descriptions all follow this format

"Enable optimization remarks from passes whose name match the given regular expression"

So maybe something like this would be more idiomatic

"Only record optimization remarks from passes whose names match the given regular expression"

[thegameg]

Thanks Jessica!

llvm/lib/IR/RemarkStreamer.cpp

35–37

That's a good idea, yes! I'll do that in a separate patch, thanks

clang/include/clang/Basic/CodeGenOptions.h

public:
   /// Name of file passed with -fcuda-include-gpubinary option to forward to
   /// CUDA runtime back-end for incorporating them into host-side object file.
   std::string CudaGpuBinaryFileName;
 
   /// The name of the file to which the backend should save YAML optimization
   /// records.
   std::string OptRecordFile;
 
+  /// The regex that filters the passes that should be saved to the optimization
+  /// records.
+  std::string OptRecordPasses;
+
   /// Regular expression to select optimizations for which we should enable
   /// optimization remarks. Transformation passes whose name matches this
   /// expression (and support this feature), will emit a diagnostic
   /// whenever they perform a transformation. This is enabled by the
   /// -Rpass=regexp flag.
   std::shared_ptr<llvm::Regex> OptimizationRemarkPattern;
 
   /// Regular expression to select optimizations for which we should enable

clang/include/clang/Driver/CC1Options.td

def arcmt_check : Flag<["-"], "arcmt-check">,
   HelpText<"Check for ARC migration issues that need manual handling">;
 def arcmt_modify : Flag<["-"], "arcmt-modify">,
   HelpText<"Apply modifications to files to conform to ARC">;
 def arcmt_migrate : Flag<["-"], "arcmt-migrate">,
   HelpText<"Apply modifications and produces temporary files that conform to ARC">;
 
 def opt_record_file : Separate<["-"], "opt-record-file">,
   HelpText<"File name to use for YAML optimization record output">;
+def opt_record_passes : Separate<["-"], "opt-record-passes">,
+  HelpText<"Pass filter regex to use for the YAML optimization record output">;
 
 def print_stats : Flag<["-"], "print-stats">,
   HelpText<"Print performance metrics and statistics">;
 def stats_file : Joined<["-"], "stats-file=">,
   HelpText<"Filename to write statistics to">;
 def fdump_record_layouts : Flag<["-"], "fdump-record-layouts">,
   HelpText<"Dump record layout information">;
 def fdump_record_layouts_simple : Flag<["-"], "fdump-record-layouts-simple">,

clang/include/clang/Driver/Options.td

 
 def fsave_optimization_record : Flag<["-"], "fsave-optimization-record">,
   Group<f_Group>, HelpText<"Generate a YAML optimization record file">;
 def fno_save_optimization_record : Flag<["-"], "fno-save-optimization-record">,
   Group<f_Group>, Flags<[NoArgumentUnused]>;
 def foptimization_record_file_EQ : Joined<["-"], "foptimization-record-file=">,
   Group<f_Group>,
   HelpText<"Specify the file name of any generated YAML optimization record">;
+def foptimization_record_passes_EQ : Joined<["-"], "foptimization-record-passes=">,
+  Group<f_Group>,
+  HelpText<"Specify the regex to filter the passes to be included in the generated optimization record">;
+
 
 def ftest_coverage : Flag<["-"], "ftest-coverage">, Group<f_Group>;
 def fvectorize : Flag<["-"], "fvectorize">, Group<f_Group>,
   HelpText<"Enable the loop vectorization passes">;
 def fno_vectorize : Flag<["-"], "fno-vectorize">, Group<f_Group>;
 def : Flag<["-"], "ftree-vectorize">, Alias<fvectorize>;
 def : Flag<["-"], "fno-tree-vectorize">, Alias<fno_vectorize>;
 def fslp_vectorize : Flag<["-"], "fslp-vectorize">, Group<f_Group>,

clang/lib/CodeGen/BackendUtil.cpp

if (CGOpts.hasProfileCSIRInstr()) {
     Conf.CSIRProfile = std::move(CGOpts.ProfileInstrumentUsePath);
   }
 
   Conf.ProfileRemapping = std::move(ProfileRemapping);
   Conf.UseNewPM = CGOpts.ExperimentalNewPassManager;
   Conf.DebugPassManager = CGOpts.DebugPassManager;
   Conf.RemarksWithHotness = CGOpts.DiagnosticsWithHotness;
   Conf.RemarksFilename = CGOpts.OptRecordFile;
+  Conf.RemarksPasses = CGOpts.OptRecordPasses;
   Conf.DwoPath = CGOpts.SplitDwarfFile;
   switch (Action) {
   case Backend_EmitNothing:
     Conf.PreCodeGenModuleHook = [](size_t Task, const Module &Mod) {
       return false;
     };
     break;
   case Backend_EmitLL:

clang/lib/CodeGen/CodeGenAction.cpp

 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclGroup.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/CodeGen/BackendUtil.h"
 #include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Lex/Preprocessor.h"
 #include "llvm/Bitcode/BitcodeReader.h"
 #include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/DiagnosticPrinter.h"
void HandleTranslationUnit(ASTContext &C) override {
           Diags.Report(diag::err_cannot_open_file) <<
             CodeGenOpts.OptRecordFile << EC.message();
           return;
         }
 
         Ctx.setRemarkStreamer(llvm::make_unique<RemarkStreamer>(
             CodeGenOpts.OptRecordFile, OptRecordFile->os()));
 
+        if (!CodeGenOpts.OptRecordPasses.empty())
+          if (Error E = Ctx.getRemarkStreamer()->setFilter(
+                  CodeGenOpts.OptRecordPasses))
+            Diags.Report(diag::err_drv_optimization_remark_pattern)
+                << toString(std::move(E)) << CodeGenOpts.OptRecordPasses;
+
         if (CodeGenOpts.getProfileUse() != CodeGenOptions::ProfileNone)
           Ctx.setDiagnosticsHotnessRequested(true);
       }
 
       // Link each LinkModule into our module.
       if (LinkInModules())
         return;
 

clang/lib/Driver/ToolChains/Clang.cpp

if (Arg *A = Args.getLastArg(options::OPT_funit_at_a_time,
     if (A->getOption().matches(options::OPT_fno_unit_at_a_time))
       D.Diag(diag::warn_drv_clang_unsupported) << A->getAsString(Args);
   }
 
   if (Args.hasFlag(options::OPT_fapple_pragma_pack,
                    options::OPT_fno_apple_pragma_pack, false))
     CmdArgs.push_back("-fapple-pragma-pack");
 
+  // Remarks can be enabled with any of the `-f.*optimization-record.*` flags.
   if (Args.hasFlag(options::OPT_fsave_optimization_record,
                    options::OPT_foptimization_record_file_EQ,
+                   options::OPT_fno_save_optimization_record, false) ||
+      Args.hasFlag(options::OPT_foptimization_record_passes_EQ,
                    options::OPT_fno_save_optimization_record, false)) {
     CmdArgs.push_back("-opt-record-file");
 
     const Arg *A = Args.getLastArg(options::OPT_foptimization_record_file_EQ);
     if (A) {
       CmdArgs.push_back(A->getValue());
     } else {
       SmallString<128> F;
if (A) {
           F += "-";
           F += JA.getOffloadingArch();
         }
       }
 
       llvm::sys::path::replace_extension(F, "opt.yaml");
       CmdArgs.push_back(Args.MakeArgString(F));
     }
+    if (const Arg *A =
+            Args.getLastArg(options::OPT_foptimization_record_passes_EQ)) {
+      CmdArgs.push_back("-opt-record-passes");
+      CmdArgs.push_back(A->getValue());
+    }
   }
 
   bool RewriteImports = Args.hasFlag(options::OPT_frewrite_imports,
                                      options::OPT_fno_rewrite_imports, false);
   if (RewriteImports)
     CmdArgs.push_back("-frewrite-imports");
 
   // Enable rewrite includes if the user's asked for it or if we're generating

clang/lib/Driver/ToolChains/Darwin.cpp

if (getLastProfileUseArg(Args)) {
       if (const Arg *A =
               Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ)) {
         CmdArgs.push_back("-mllvm");
         std::string Opt =
             std::string("-lto-pass-remarks-hotness-threshold=") + A->getValue();
         CmdArgs.push_back(Args.MakeArgString(Opt));
       }
     }
+
+    if (const Arg *A =
+            Args.getLastArg(options::OPT_foptimization_record_passes_EQ)) {
+      CmdArgs.push_back("-mllvm");
+      std::string Passes =
+          std::string("-lto-pass-remarks-passes=") + A->getValue();
+      CmdArgs.push_back(Args.MakeArgString(Passes));
+    }
   }
 
   // Propagate the -moutline flag to the linker in LTO.
   if (Args.hasFlag(options::OPT_moutline, options::OPT_mno_outline, false)) {
     if (getMachOToolChain().getMachOArchName(Args) == "arm64") {
       CmdArgs.push_back("-mllvm");
       CmdArgs.push_back("-enable-machine-outliner");
 

clang/lib/Frontend/CompilerInvocation.cpp

static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
   bool NeedLocTracking = false;
 
   Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
   if (!Opts.OptRecordFile.empty())
     NeedLocTracking = true;
 
+  if (Arg *A = Args.getLastArg(OPT_opt_record_passes)) {
+    Opts.OptRecordPasses = A->getValue();
+    NeedLocTracking = true;
+  }
+
   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
     Opts.OptimizationRemarkPattern =
         GenerateOptimizationRemarkRegex(Diags, Args, A);
     NeedLocTracking = true;
   }
 
   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
     Opts.OptimizationRemarkMissedPattern =

clang/test/CodeGen/opt-record-MIR.c

 // REQUIRES: aarch64-registered-target
 // RUN: %clang_cc1 -triple arm64-apple-ios -S -o /dev/null %s -O2 -dwarf-column-info -Rpass-missed=regalloc 2>&1 | FileCheck -check-prefix=REMARK %s
 // RUN: %clang_cc1 -triple arm64-apple-ios -S -o /dev/null %s -O2 -dwarf-column-info 2>&1 | FileCheck -allow-empty -check-prefix=NO_REMARK %s
 // RUN: %clang_cc1 -triple arm64-apple-ios -S -o /dev/null %s -O2 -dwarf-column-info -opt-record-file %t.yaml
 // RUN: cat %t.yaml | FileCheck -check-prefix=YAML %s
+// RUN: %clang_cc1 -triple arm64-apple-ios -S -o /dev/null %s -O2 -dwarf-column-info -opt-record-file %t.yaml -opt-record-passes asm-printer
+// RUN: cat %t.yaml | FileCheck -check-prefix=PASSES %s
 
 void bar(float);
 
 void foo(float *p, int i) {
   while (i--)  {
     float f = *p;
     asm("" ::
         : "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23", "x24", "x25", "x26", "x27", "x28", "fp", "lr", "sp", "memory");
     bar(f);
   }
 }
 
-// REMARK: opt-record-MIR.c:10:11: remark: {{.}} spills {{.}} reloads generated in loop
+// REMARK: opt-record-MIR.c:12:11: remark: {{.}} spills {{.}} reloads generated in loop
 // NO_REMARK-NOT: remark:
 
 // YAML: --- !Missed
 // YAML: Pass:            regalloc
 // YAML: Name:            LoopSpillReload
 // YAML: DebugLoc:        { File: {{[^,]+}},
-// YAML:                    Line: 10,
+// YAML:                    Line: 12,
 // YAML:                    Column: 11 }
 // YAML: Function:        foo
 // YAML: Args:
 // YAML:   - NumSpills:       '{{.}}'
 // YAML:   - String:          ' spills '
 // YAML:   - NumReloads:      '{{.}}'
 // YAML:   - String:          ' reloads '
 // YAML:   - String:          generated
 // YAML: ...
+
+// PASSES: Pass:            asm-printer
+// PASSES-NOT: regalloc

clang/test/CodeGen/opt-record.c

 // RUN: %clang_cc1 -O3 -triple x86_64-unknown-linux-gnu -target-cpu x86-64 %s -o %t -dwarf-column-info -opt-record-file %t.yaml -emit-obj
 // RUN: cat %t.yaml | FileCheck %s
 // RUN: llvm-profdata merge %S/Inputs/opt-record.proftext -o %t.profdata
 // RUN: %clang_cc1 -O3 -triple x86_64-unknown-linux-gnu -target-cpu x86-64 -fprofile-instrument-use-path=%t.profdata %s -o %t -dwarf-column-info -opt-record-file %t.yaml -emit-obj
 // RUN: cat %t.yaml | FileCheck -check-prefix=CHECK -check-prefix=CHECK-PGO %s
+// RUN: %clang_cc1 -O3 -triple x86_64-unknown-linux-gnu -target-cpu x86-64 %s -o %t -dwarf-column-info -opt-record-file %t.yaml -opt-record-passes inline -emit-obj
+// RUN: cat %t.yaml | FileCheck -check-prefix=CHECK-PASSES %s
 // REQUIRES: x86-registered-target
 
 void bar();
 void foo() { bar(); }
 
 void Test(int *res, int *c, int *d, int *p, int n) {
   int i;
 
 #pragma clang loop vectorize(assume_safety)
   for (i = 0; i < 1600; i++) {
     res[i] = (p[i] == 0) ? res[i] : res[i] + d[i];
   }
 }
 
 // CHECK: --- !Missed
 // CHECK: Pass:            inline
 // CHECK: Name:            NoDefinition
 // CHECK: DebugLoc:
 // CHECK: Function:        foo
 // CHECK-PGO: Hotness:
+// CHECK-PASSES: Pass: inline
 
 // CHECK: --- !Passed
 // CHECK: Pass:            loop-vectorize
 // CHECK: Name:            Vectorized
 // CHECK: DebugLoc:
 // CHECK: Function:        Test
 // CHECK-PGO: Hotness:
-
+// CHECK-PASSES-NOT: loop-vectorize

clang/test/Driver/darwin-ld.c

 // RUN: %clang -target x86_64-apple-darwin12 %t.o -fsave-optimization-record -fprofile-instr-use=blah -### -o foo/bar.out 2> %t.log
 // RUN: FileCheck -check-prefix=PASS_REMARKS_WITH_HOTNESS %s < %t.log
 // PASS_REMARKS_WITH_HOTNESS: "-mllvm" "-lto-pass-remarks-output" "-mllvm" "foo/bar.out.opt.yaml" "-mllvm" "-lto-pass-remarks-with-hotness"
 
 // RUN: %clang -target x86_64-apple-darwin12 %t.o -fsave-optimization-record -fprofile-instr-use=blah -fdiagnostics-hotness-threshold=100 -### -o foo/bar.out 2> %t.log
 // RUN: FileCheck -check-prefix=PASS_REMARKS_WITH_HOTNESS_THRESHOLD %s < %t.log
 // PASS_REMARKS_WITH_HOTNESS_THRESHOLD: "-mllvm" "-lto-pass-remarks-output" "-mllvm" "foo/bar.out.opt.yaml" "-mllvm" "-lto-pass-remarks-with-hotness" "-mllvm" "-lto-pass-remarks-hotness-threshold=100"
 
+// RUN: %clang -target x86_64-apple-darwin12 %t.o -fsave-optimization-record -foptimization-record-passes=inline -### -o foo/bar.out 2> %t.log
+// RUN: FileCheck -check-prefix=PASS_REMARKS_WITH_PASSES %s < %t.log
+// PASS_REMARKS_WITH_PASSES: "-mllvm" "-lto-pass-remarks-output" "-mllvm" "foo/bar.out.opt.yaml" "-mllvm" "-lto-pass-remarks-passes=inline"
+
 // RUN: %clang -target x86_64-apple-ios6.0 -miphoneos-version-min=6.0 -fprofile-instr-generate -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
 // RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
 // RUN: %clang -target i386-apple-darwin9 -fprofile-instr-generate -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
 // RUN: %clang -target arm64-apple-ios5.0 -miphoneos-version-min=5.0 -fprofile-instr-generate -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log

clang/test/Driver/opt-record.c

 // RUN: %clang -### -S -o FOO -fsave-optimization-record %s 2>&1 | FileCheck %s
 // RUN: %clang -### -c -o FOO -fsave-optimization-record %s 2>&1 | FileCheck %s
 // RUN: %clang -### -c -o FOO.o -fsave-optimization-record %s 2>&1 | FileCheck %s
 // RUN: %clang -### -save-temps -S -o FOO -fsave-optimization-record %s 2>&1 | FileCheck %s
 // RUN: %clang -### -save-temps -c -o FOO.o -fsave-optimization-record %s 2>&1 | FileCheck %s
 // RUN: %clang -### -c -fsave-optimization-record %s 2>&1 | FileCheck %s -check-prefix=CHECK-NO-O
 // RUN: %clang -### -save-temps -c -fsave-optimization-record %s 2>&1 | FileCheck %s -check-prefix=CHECK-NO-O
 // RUN: %clang -### -fsave-optimization-record %s 2>&1 | FileCheck %s -check-prefix=CHECK-NO-O
 // RUN: %clang -### -S -fsave-optimization-record -x cuda -nocudainc -nocudalib %s 2>&1 | FileCheck %s -check-prefix=CHECK-NO-O -check-prefix=CHECK-CUDA-DEV
 // RUN: %clang -### -fsave-optimization-record -x cuda -nocudainc -nocudalib %s 2>&1 | FileCheck %s -check-prefix=CHECK-NO-O -check-prefix=CHECK-CUDA-DEV
 // RUN: %clang -### -S -o FOO -fsave-optimization-record -foptimization-record-file=BAR.txt %s 2>&1 | FileCheck %s -check-prefix=CHECK-EQ
 // RUN: %clang -### -S -o FOO -foptimization-record-file=BAR.txt %s 2>&1 | FileCheck %s -check-prefix=CHECK-EQ
 // RUN: %clang -### -S -o FOO -foptimization-record-file=BAR.txt -fno-save-optimization-record %s 2>&1 | FileCheck %s --check-prefix=CHECK-FOPT-DISABLE
 
+// RUN: %clang -### -S -o FOO -fsave-optimization-record -foptimization-record-passes=inline %s 2>&1 | FileCheck %s -check-prefix=CHECK-EQ-PASSES
+// RUN: %clang -### -S -o FOO -foptimization-record-passes=inline %s 2>&1 | FileCheck %s -check-prefix=CHECK-EQ-PASSES
+// RUN: %clang -### -S -o FOO -foptimization-record-passes=inline -fno-save-optimization-record %s 2>&1 | FileCheck %s --check-prefix=CHECK-FOPT-DISABLE-PASSES
+//
 // CHECK: "-cc1"
 // CHECK: "-opt-record-file" "FOO.opt.yaml"
 
 // CHECK-NO-O: "-cc1"
 // CHECK-NO-O-DAG: "-opt-record-file" "opt-record.opt.yaml"
 // CHECK-CUDA-DEV-DAG: "-opt-record-file" "opt-record-cuda-{{nvptx64|nvptx}}-nvidia-cuda-sm_20.opt.yaml"
 
 // CHECK-EQ: "-cc1"
 // CHECK-EQ: "-opt-record-file" "BAR.txt"
 
 // CHECK-FOPT-DISABLE-NOT: "-fno-save-optimization-record"
+
+// CHECK-EQ-PASSES: "-cc1"
+// CHECK-EQ-PASSES: "-opt-record-passes" "inline"
+
+// CHECK-FOPT-DISABLE-PASSES-NOT: "-fno-save-optimization-record"

lld/ELF/Config.h

struct Configuration {
   llvm::StringRef LTOAAPipeline;
   llvm::StringRef LTOCSProfileFile;
   llvm::StringRef LTONewPmPasses;
   llvm::StringRef LTOObjPath;
   llvm::StringRef LTOSampleProfile;
   llvm::StringRef MapFile;
   llvm::StringRef OutputFile;
   llvm::StringRef OptRemarksFilename;
+  llvm::StringRef OptRemarksPasses;
   llvm::StringRef ProgName;
   llvm::StringRef SoName;
   llvm::StringRef Sysroot;
   llvm::StringRef ThinLTOCacheDir;
   llvm::StringRef ThinLTOIndexOnlyArg;
   std::pair<llvm::StringRef, llvm::StringRef> ThinLTOObjectSuffixReplace;
   std::pair<llvm::StringRef, llvm::StringRef> ThinLTOPrefixReplace;
   std::string Rpath;

lld/ELF/Driver.cpp

void LinkerDriver::readConfigs(opt::InputArgList &Args) {
   Config->MipsGotSize = args::getInteger(Args, OPT_mips_got_size, 0xfff0);
   Config->MergeArmExidx =
       Args.hasFlag(OPT_merge_exidx_entries, OPT_no_merge_exidx_entries, true);
   Config->NoinhibitExec = Args.hasArg(OPT_noinhibit_exec);
   Config->Nostdlib = Args.hasArg(OPT_nostdlib);
   Config->OFormatBinary = isOutputFormatBinary(Args);
   Config->Omagic = Args.hasFlag(OPT_omagic, OPT_no_omagic, false);
   Config->OptRemarksFilename = Args.getLastArgValue(OPT_opt_remarks_filename);
+  Config->OptRemarksPasses = Args.getLastArgValue(OPT_opt_remarks_passes);
   Config->OptRemarksWithHotness = Args.hasArg(OPT_opt_remarks_with_hotness);
   Config->Optimize = args::getInteger(Args, OPT_O, 1);
   Config->OrphanHandling = getOrphanHandling(Args);
   Config->OutputFile = Args.getLastArgValue(OPT_o);
   Config->Pie = Args.hasFlag(OPT_pie, OPT_no_pie, false);
   Config->PrintIcfSections =
       Args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false);
   Config->PrintGcSections =

lld/ELF/LTO.cpp

static lto::Config createConfig() {
   C.CGOptLevel = args::getCGOptLevel(Config->LTOO);
 
   // Set up a custom pipeline if we've been asked to.
   C.OptPipeline = Config->LTONewPmPasses;
   C.AAPipeline = Config->LTOAAPipeline;
 
   // Set up optimization remarks if we've been asked to.
   C.RemarksFilename = Config->OptRemarksFilename;
+  C.RemarksPasses = Config->OptRemarksPasses;
   C.RemarksWithHotness = Config->OptRemarksWithHotness;
 
   C.SampleProfile = Config->LTOSampleProfile;
   C.UseNewPM = Config->LTONewPassManager;
   C.DebugPassManager = Config->LTODebugPassManager;
   C.DwoDir = Config->DwoDir;
 
   C.CSIRProfile = Config->LTOCSProfileFile;

lld/ELF/Options.td

 def lto_cs_profile_file: J<"lto-cs-profile-file=">,
   HelpText<"Context sensitive profile file path">;
 def lto_sample_profile: J<"lto-sample-profile=">,
   HelpText<"Sample profile file path">;
 def disable_verify: F<"disable-verify">;
 defm mllvm: Eq<"mllvm", "Additional arguments to forward to LLVM's option processing">;
 def opt_remarks_filename: Separate<["--"], "opt-remarks-filename">,
   HelpText<"YAML output file for optimization remarks">;
+def opt_remarks_passes: Separate<["--"], "opt-remarks-passes">,
+  HelpText<"Regex for the passes that need to be serialized to the output file">;
 def opt_remarks_with_hotness: Flag<["--"], "opt-remarks-with-hotness">,
   HelpText<"Include hotness information in the optimization remarks file">;
 defm plugin_opt: Eq<"plugin-opt", "specifies LTO options for compatibility with GNU linkers">;
 def save_temps: F<"save-temps">;
 def thinlto_cache_dir: J<"thinlto-cache-dir=">,
   HelpText<"Path to ThinLTO cached object file directory">;
 defm thinlto_cache_policy: Eq<"thinlto-cache-policy", "Pruning policy for the ThinLTO cache">;
 def thinlto_jobs: J<"thinlto-jobs=">, HelpText<"Number of ThinLTO jobs">;

lld/docs/ld.lld.1

 is
 .Cm binary ,
 which produces output with no ELF header.
 .It Fl -omagic , Fl N
 Set the text and data sections to be readable and writable.
 .It Fl -opt-remarks-filename Ar file
 Write optimization remarks in YAML format to
 .Ar file .
+.It Fl -opt-remarks-passes Ar pass-regex
+Filter optimization remarks by only allowing the passes matching
+.Ar pass-regex .
 .It Fl -opt-remarks-with-hotness
 Include hotness information in the optimization remarks file.
 .It Fl -orphan-handling Ns = Ns Ar mode
 Control how orphan sections are handled. An orphan section is one not
 specifically mentioned in a linker script.
 .Ar mode
 may be:
 .Pp

lld/test/ELF/lto/opt-remarks.ll

 ; REQUIRES: x86
 ; RUN: llvm-as %s -o %t.o
 
 ; RUN: rm -f %t.yaml
 ; RUN: ld.lld --opt-remarks-filename %t.yaml %t.o -o %t -shared -save-temps
 ; RUN: llvm-dis %t.0.4.opt.bc -o - | FileCheck %s
 ; RUN: ld.lld --opt-remarks-with-hotness --opt-remarks-filename %t.hot.yaml \
 ; RUN:  %t.o -o %t -shared
 ; RUN: cat %t.yaml | FileCheck %s -check-prefix=YAML
 ; RUN: cat %t.hot.yaml | FileCheck %s -check-prefix=YAML-HOT
+; RUN: ld.lld --opt-remarks-filename %t1.yaml --opt-remarks-passes inline %t.o \
+; RUN: -o /dev/null -shared
+; RUN: cat %t1.yaml | FileCheck %s -check-prefix=YAML-PASSES
 
 ; Check that @tinkywinky is inlined after optimizations.
 ; CHECK-LABEL: define i32 @main
 ; CHECK-NEXT:  %a.i = call i32 @patatino()
 ; CHECK-NEXT:  ret i32 %a.i
 ; CHECK-NEXT: }
 
 ; YAML:      --- !Passed

 ; YAML-HOT-NEXT:   - String:          ' with '
 ; YAML-HOT-NEXT:   - String:          '(cost='
 ; YAML-HOT-NEXT:   - Cost:            '0'
 ; YAML-HOT-NEXT:   - String:          ', threshold='
 ; YAML-HOT-NEXT:   - Threshold:       '337'
 ; YAML-HOT-NEXT:   - String:          ')'
 ; YAML-HOT-NEXT: ...
 
+; YAML-PASSES: Pass:            inline
+
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-scei-ps4"
 
 declare i32 @patatino()
 
 define i32 @tinkywinky() {
   %a = call i32 @patatino()
   ret i32 %a
 }
 
 define i32 @main() !prof !0 {
   %i = call i32 @tinkywinky()
   ret i32 %i
 }
 
 !0 = !{!"function_entry_count", i64 300}

llvm/include/llvm/IR/RemarkStreamer.h

 //===- llvm/IR/RemarkStreamer.h - Remark Streamer ---------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the main interface for outputting remarks.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_IR_REMARKSTREAMER_H
 #define LLVM_IR_REMARKSTREAMER_H
 
 #include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/Support/Error.h"
 #include "llvm/Support/YAMLTraits.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Regex.h"
 #include <string>
 #include <vector>
 
 namespace llvm {
 /// Streamer for remarks.
 class RemarkStreamer {
   /// The filename that the remark diagnostics are emitted to.
   const std::string Filename;
   /// The open raw_ostream that the remark diagnostics are emitted to.
   raw_ostream &OS;
+  /// The regex used to filter remarks based on the passes that emit them.
+  Optional<Regex> PassFilter;
 
   /// The YAML streamer.
   yaml::Output YAMLOutput;
 
 public:
   RemarkStreamer(StringRef Filename, raw_ostream& OS);
   /// Return the filename that the remark diagnostics are emitted to.
   StringRef getFilename() const { return Filename; }
   /// Return stream that the remark diagnostics are emitted to.
   raw_ostream &getStream() { return OS; }
+  /// Set a pass filter based on a regex \p Filter.
+  /// Returns an error if the regex is invalid.
+  Error setFilter(StringRef Filter);
   /// Emit a diagnostic through the streamer.
   void emit(const DiagnosticInfoOptimizationBase &Diag);
 };
 } // end namespace llvm
 
 #endif // LLVM_IR_REMARKSTREAMER_H

llvm/include/llvm/LTO/Config.h

struct Config {
   /// The path to write a .dwo file to. This should generally only be used when
   /// running an individual backend directly via thinBackend(), as otherwise
   /// all .dwo files will be written to the same path.
   std::string DwoPath;
 
   /// Optimization remarks file path.
   std::string RemarksFilename = "";
 
+  /// Optimization remarks pass filter.
+  std::string RemarksPasses = "";
+
   /// Whether to emit optimization remarks with hotness informations.
   bool RemarksWithHotness = false;
 
   /// Whether to emit the pass manager debuggging informations.
   bool DebugPassManager = false;
 
   /// Statistics output file path.
   std::string StatsFile;

llvm/include/llvm/LTO/LTO.h

 /// resulting directory if it does not yet exist.
 std::string getThinLTOOutputFile(const std::string &Path,
                                  const std::string &OldPrefix,
                                  const std::string &NewPrefix);
 
 /// Setup optimization remarks.
 Expected<std::unique_ptr<ToolOutputFile>>
 setupOptimizationRemarks(LLVMContext &Context, StringRef LTORemarksFilename,
+                         StringRef LTORemarksPasses,
                          bool LTOPassRemarksWithHotness, int Count = -1);
 
 class LTO;
 struct SymbolResolution;
 class ThinBackendProc;
 
 /// An input file. This is a symbol table wrapper that only exposes the
 /// information that an LTO client should need in order to do symbol resolution.

llvm/lib/IR/RemarkStreamer.cpp

 using namespace llvm;
 
 RemarkStreamer::RemarkStreamer(StringRef Filename, raw_ostream &OS)
     : Filename(Filename), OS(OS),
       YAMLOutput(OS, reinterpret_cast<void *>(this)) {
   assert(!Filename.empty() && "This needs to be a real filename.");
 }
 
+Error RemarkStreamer::setFilter(StringRef Filter) {
+  Regex R = Regex(Filter);
+  std::string RegexError;
+  if (!R.isValid(RegexError))
+    return createStringError(std::make_error_code(std::errc::invalid_argument),
+                             RegexError.data());
+  PassFilter = std::move(R);
+  return Error::success();
+}
+
 void RemarkStreamer::emit(const DiagnosticInfoOptimizationBase &Diag) {
+  if (Optional<Regex> &Filter = PassFilter)
+    if (!Filter->match(Diag.getPassName()))
+      return;
+
   DiagnosticInfoOptimizationBase *DiagPtr =
       const_cast<DiagnosticInfoOptimizationBase *>(&Diag);
   YAMLOutput << DiagPtr;
 }

llvm/lib/LTO/LTO.cpp

Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache) {
   }
 
   return BackendProc->wait();
 }
 
 Expected<std::unique_ptr<ToolOutputFile>>
 lto::setupOptimizationRemarks(LLVMContext &Context,
                               StringRef LTORemarksFilename,
+                              StringRef LTORemarksPasses,
                               bool LTOPassRemarksWithHotness, int Count) {
   if (LTOPassRemarksWithHotness)
     Context.setDiagnosticsHotnessRequested(true);
   if (LTORemarksFilename.empty())
     return nullptr;
 
   std::string Filename = LTORemarksFilename;
   if (Count != -1)
     Filename += ".thin." + llvm::utostr(Count) + ".yaml";
 
   std::error_code EC;
   auto DiagnosticFile =
       llvm::make_unique<ToolOutputFile>(Filename, EC, sys::fs::F_None);
   if (EC)
     return errorCodeToError(EC);
   Context.setRemarkStreamer(
       llvm::make_unique<RemarkStreamer>(Filename, DiagnosticFile->os()));
+
+  if (!LTORemarksPasses.empty())
+    if (Error E = Context.getRemarkStreamer()->setFilter(LTORemarksPasses))
+      return std::move(E);
+
   DiagnosticFile->keep();
   return std::move(DiagnosticFile);
 }

llvm/lib/LTO/LTOBackend.cpp

Error lto::backend(Config &C, AddStreamFn AddStream,
                    ModuleSummaryIndex &CombinedIndex) {
   Expected<const Target *> TOrErr = initAndLookupTarget(C, *Mod);
   if (!TOrErr)
     return TOrErr.takeError();
 
   std::unique_ptr<TargetMachine> TM = createTargetMachine(C, *TOrErr, *Mod);
 
   // Setup optimization remarks.
-  auto DiagFileOrErr = lto::setupOptimizationRemarks(
-      Mod->getContext(), C.RemarksFilename, C.RemarksWithHotness);
+  auto DiagFileOrErr =
+      lto::setupOptimizationRemarks(Mod->getContext(), C.RemarksFilename,
+                                    C.RemarksPasses, C.RemarksWithHotness);
   if (!DiagFileOrErr)
     return DiagFileOrErr.takeError();
   auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
 
   if (!C.CodeGenOnly) {
     if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false,
              /*ExportSummary=*/&CombinedIndex, /*ImportSummary=*/nullptr))
       return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
   Expected<const Target *> TOrErr = initAndLookupTarget(Conf, Mod);
   if (!TOrErr)
     return TOrErr.takeError();
 
   std::unique_ptr<TargetMachine> TM = createTargetMachine(Conf, *TOrErr, Mod);
 
   // Setup optimization remarks.
   auto DiagFileOrErr = lto::setupOptimizationRemarks(
-      Mod.getContext(), Conf.RemarksFilename, Conf.RemarksWithHotness, Task);
+      Mod.getContext(), Conf.RemarksFilename, Conf.RemarksPasses,
+      Conf.RemarksWithHotness, Task);
   if (!DiagFileOrErr)
     return DiagFileOrErr.takeError();
   auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
 
   if (Conf.CodeGenOnly) {
     codegen(Conf, TM.get(), AddStream, Task, Mod);
     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
   }

llvm/lib/LTO/LTOCodeGenerator.cpp

 #endif
     cl::Hidden);
 
 cl::opt<std::string>
     LTORemarksFilename("lto-pass-remarks-output",
                        cl::desc("Output filename for pass remarks"),
                        cl::value_desc("filename"));
 
+cl::opt<std::string> LTORemarksPasses(
+    "lto-pass-remarks-passes",
+    cl::desc(
+        "Regex for the passes that need to be serialized to the output file."),
+    cl::value_desc("filename"));
+
 cl::opt<bool> LTOPassRemarksWithHotness(
     "lto-pass-remarks-with-hotness",
     cl::desc("With PGO, include profile count in optimization remarks"),
     cl::Hidden);
 }
 
 LTOCodeGenerator::LTOCodeGenerator(LLVMContext &Context)
     : Context(Context), MergedModule(new Module("ld-temp.o", Context)),

 /// Optimize merged modules using various IPO passes
 bool LTOCodeGenerator::optimize(bool DisableVerify, bool DisableInline,
                                 bool DisableGVNLoadPRE,
                                 bool DisableVectorization) {
   if (!this->determineTarget())
     return false;
 
   auto DiagFileOrErr = lto::setupOptimizationRemarks(
-      Context, LTORemarksFilename, LTOPassRemarksWithHotness);
+      Context, LTORemarksFilename, LTORemarksPasses, LTOPassRemarksWithHotness);
   if (!DiagFileOrErr) {
     errs() << "Error: " << toString(DiagFileOrErr.takeError()) << "\n";
     report_fatal_error("Can't get an output file for the remarks");
   }
   DiagnosticOutputFile = std::move(*DiagFileOrErr);
 
   // We always run the verifier once on the merged module, the `DisableVerify`
   // parameter only applies to subsequent verify.

llvm/lib/LTO/ThinLTOCodeGenerator.cpp

 using namespace llvm;
 
 #define DEBUG_TYPE "thinlto"
 
 namespace llvm {
 // Flags -discard-value-names, defined in LTOCodeGenerator.cpp
 extern cl::opt<bool> LTODiscardValueNames;
 extern cl::opt<std::string> LTORemarksFilename;
+extern cl::opt<std::string> LTORemarksPasses;
 extern cl::opt<bool> LTOPassRemarksWithHotness;
 }
 
 namespace {
 
 static cl::opt<int>
     ThreadCount("threads", cl::init(llvm::heavyweight_hardware_concurrency()));
 
for (auto IndexCount : ModulesOrdering) {
             return;
           }
         }
 
         LLVMContext Context;
         Context.setDiscardValueNames(LTODiscardValueNames);
         Context.enableDebugTypeODRUniquing();
         auto DiagFileOrErr = lto::setupOptimizationRemarks(
-            Context, LTORemarksFilename, LTOPassRemarksWithHotness, count);
+            Context, LTORemarksFilename, LTORemarksPasses,
+            LTOPassRemarksWithHotness, count);
         if (!DiagFileOrErr) {
           errs() << "Error: " << toString(DiagFileOrErr.takeError()) << "\n";
           report_fatal_error("ThinLTO: Can't get an output file for the "
                              "remarks");
         }
 
         // Parse module now
         auto TheModule =

llvm/test/LTO/Resolution/X86/diagnostic-handler-remarks.ll

 ; Test of LTO with opt remarks YAML output.
 
 ; First try with Regular LTO
 ; RUN: llvm-as < %s >%t.bc
 ; RUN: rm -f %t.yaml
 ; RUN: llvm-lto2 run -pass-remarks-output=%t.yaml \
+; RUN:           -pass-remarks-passes=inline \
 ; RUN:           -r %t.bc,tinkywinky,p \
 ; RUN:           -r %t.bc,patatino,px \
 ; RUN:           -r %t.bc,main,px -o %t.o %t.bc
 ; RUN: cat %t.yaml | FileCheck %s -check-prefix=YAML
 
 ; Try again with ThinLTO
 ; RUN: opt -module-summary %s -o %t.bc
 ; RUN: rm -f %t.thin.1.yaml
 ; RUN: llvm-lto2 run -pass-remarks-output=%t \
+; RUN:           -pass-remarks-passes=inline \
 ; RUN:           -r %t.bc,tinkywinky,p \
 ; RUN:           -r %t.bc,patatino,px \
 ; RUN:           -r %t.bc,main,px -o %t.o %t.bc
 ; RUN: cat %t.thin.1.yaml | FileCheck %s -check-prefix=YAML
 
 ; YAML:      --- !Passed
 ; YAML-NEXT: Pass:            inline
 ; YAML-NEXT: Name:            Inlined

llvm/test/ThinLTO/X86/diagnostic-handler-remarks.ll

 ; RUN: opt -module-summary %s -o %t1.bc
 ; RUN: opt -module-summary %p/Inputs/diagnostic-handler-remarks.ll -o %t2.bc
 
 ; Optimization records are collected regardless of the diagnostic handler
 ; RUN: rm -f %t.yaml.thin.0.yaml %t.yaml.thin.1.yaml
 ; RUN: llvm-lto -thinlto-action=run \
 ; RUN:          -lto-pass-remarks-output=%t.yaml \
+; RUN:          -lto-pass-remarks-passes=inline \
 ; RUN:          -exported-symbol _func2 \
 ; RUN:          -exported-symbol _main %t1.bc %t2.bc 2>&1 | \
 ; RUN:     FileCheck %s -allow-empty
 ; CHECK-NOT: remark:
 ; CHECK-NOT: llvm-lto:
 
 
 ; Verify that bar is imported and inlined into foo

llvm/tools/gold/gold-plugin.cpp

#endif
   static bool new_pass_manager = false;
   // Debug new pass manager
   static bool debug_pass_manager = false;
   // Directory to store the .dwo files.
   static std::string dwo_dir;
   /// Statistics output filename.
   static std::string stats_file;
 
-  // Optimization remarks filename and hotness options
+  // Optimization remarks filename, accepted passes and hotness options
   static std::string OptRemarksFilename;
+  static std::string OptRemarksPasses;
   static bool OptRemarksWithHotness = false;
 
   // Context sensitive PGO options.
   static std::string cs_profile_path;
   static bool cs_pgo_gen = false;
 
   static void process_plugin_option(const char *opt_)
   {
static void process_plugin_option(const char *opt_)
     } else if (opt == "new-pass-manager") {
       new_pass_manager = true;
     } else if (opt == "debug-pass-manager") {
       debug_pass_manager = true;
     } else if (opt.startswith("dwo_dir=")) {
       dwo_dir = opt.substr(strlen("dwo_dir="));
     } else if (opt.startswith("opt-remarks-filename=")) {
       OptRemarksFilename = opt.substr(strlen("opt-remarks-filename="));
+    } else if (opt.startswith("opt-remarks-passes=")) {
+      OptRemarksPasses = opt.substr(strlen("opt-remarks-passes="));
     } else if (opt == "opt-remarks-with-hotness") {
       OptRemarksWithHotness = true;
     } else if (opt.startswith("stats-file=")) {
       stats_file = opt.substr(strlen("stats-file="));
     } else {
       // Save this option to pass to the code generator.
       // ParseCommandLineOptions() expects argv[0] to be program name. Lazily
       // add that.
static std::unique_ptr<LTO> createLTO(IndexWriteCallback OnIndexWrite,
   if (!options::cs_profile_path.empty())
     Conf.CSIRProfile = options::cs_profile_path;
   Conf.RunCSIRInstr = options::cs_pgo_gen;
 
   Conf.DwoDir = options::dwo_dir;
 
   // Set up optimization remarks handling.
   Conf.RemarksFilename = options::OptRemarksFilename;
+  Conf.RemarksPasses = options::OptRemarksPasses;
   Conf.RemarksWithHotness = options::OptRemarksWithHotness;
 
   // Use new pass manager if set in driver
   Conf.UseNewPM = options::new_pass_manager;
   // Debug new pass manager if requested
   Conf.DebugPassManager = options::debug_pass_manager;
 
   Conf.StatsFile = options::stats_file;

llvm/tools/llc/llc.cpp

static cl::opt<unsigned> PassRemarksHotnessThreshold(
     cl::desc("Minimum profile count required for an optimization remark to be output"),
     cl::Hidden);
 
 static cl::opt<std::string>
     RemarksFilename("pass-remarks-output",
                     cl::desc("YAML output filename for pass remarks"),
                     cl::value_desc("filename"));
 
+static cl::opt<std::string> RemarksPasses(
+    "pass-remarks-passes",
+    cl::desc("Regex to decide which passes to include in the remarks"),
+    cl::value_desc("regex"));
+
 namespace {
 static ManagedStatic<std::vector<std::string>> RunPassNames;
 
 struct RunPassOption {
   void operator=(const std::string &Val) const {
     if (Val.empty())
       return;
     SmallVector<StringRef, 8> PassNames;
if (RemarksFilename != "") {
     YamlFile =
         llvm::make_unique<ToolOutputFile>(RemarksFilename, EC, sys::fs::F_None);
     if (EC) {
       WithColor::error(errs(), argv[0]) << EC.message() << '\n';
       return 1;
     }
     Context.setRemarkStreamer(
         llvm::make_unique<RemarkStreamer>(RemarksFilename, YamlFile->os()));
+
+    if (!RemarksPasses.empty())
+      if (Error E = Context.getRemarkStreamer()->setFilter(RemarksPasses)) {
+        WithColor::error(errs(), argv[0]) << E << '\n';
+        return 1;
+      }
   }
 
   if (InputLanguage != "" && InputLanguage != "ir" &&
       InputLanguage != "mir") {
     WithColor::error(errs(), argv[0])
         << "input language must be '', 'IR' or 'MIR'\n";
     return 1;
   }

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

static cl::opt<std::string>
     OptRemarksOutput("pass-remarks-output",
                      cl::desc("YAML output file for optimization remarks"));
 
 static cl::opt<bool> OptRemarksWithHotness(
     "pass-remarks-with-hotness",
     cl::desc("Whether to include hotness informations in the remarks.\n"
              "Has effect only if -pass-remarks-output is specified."));
 
+static cl::opt<std::string> OptRemarksPasses(
+    "pass-remarks-passes",
+    cl::desc("Regex to decide which passes to include in the remarks."));
+
 static cl::opt<std::string>
     SamplePGOFile("lto-sample-profile-file",
                   cl::desc("Specify a SamplePGO profile file"));
 
 static cl::opt<std::string>
     CSPGOFile("lto-cspgo-profile-file",
               cl::desc("Specify a context sensitive PGO profile file"));
 
static int run(int argc, char **argv) {
   Conf.DebugPassManager = DebugPassManager;
 
   if (SaveTemps)
     check(Conf.addSaveTemps(OutputFilename + "."),
           "Config::addSaveTemps failed");
 
   // Optimization remarks.
   Conf.RemarksFilename = OptRemarksOutput;
+  Conf.RemarksPasses = OptRemarksPasses;
   Conf.RemarksWithHotness = OptRemarksWithHotness;
 
   Conf.SampleProfile = SamplePGOFile;
   Conf.CSIRProfile = CSPGOFile;
   Conf.RunCSIRInstr = RunCSIRInstr;
 
   // Run a custom pipeline, if asked for.
   Conf.OptPipeline = OptPipeline;

llvm/tools/opt/opt.cpp

static cl::opt<unsigned> PassRemarksHotnessThreshold(
     cl::desc("Minimum profile count required for an optimization remark to be output"),
     cl::Hidden);
 
 static cl::opt<std::string>
     RemarksFilename("pass-remarks-output",
                     cl::desc("YAML output filename for pass remarks"),
                     cl::value_desc("filename"));
 
+static cl::opt<std::string> RemarksPasses(
+    "pass-remarks-passes",
+    cl::desc("Regex to decide which passes to include in the remarks"),
+    cl::value_desc("regex"));
+
 cl::opt<PGOKind>
     PGOKindFlag("pgo-kind", cl::init(NoPGO), cl::Hidden,
                 cl::desc("The kind of profile guided optimization"),
                 cl::values(clEnumValN(NoPGO, "nopgo", "Do not use PGO."),
                            clEnumValN(InstrGen, "pgo-instr-gen-pipeline",
                                       "Instrument the IR to generate profile."),
                            clEnumValN(InstrUse, "pgo-instr-use-pipeline",
                                       "Use instrumented profile to guide PGO."),
if (RemarksFilename != "") {
     OptRemarkFile =
         llvm::make_unique<ToolOutputFile>(RemarksFilename, EC, sys::fs::F_None);
     if (EC) {
       errs() << EC.message() << '\n';
       return 1;
     }
     Context.setRemarkStreamer(llvm::make_unique<RemarkStreamer>(
         RemarksFilename, OptRemarkFile->os()));
+
+    if (!RemarksPasses.empty())
+      if (Error E = Context.getRemarkStreamer()->setFilter(RemarksPasses)) {
+        errs() << E << '\n';
+        return 1;
+      }
   }
 
   // Load the input module...
   std::unique_ptr<Module> M =
       parseIRFile(InputFilename, Err, Context, !NoVerify, ClDataLayout);
 
   if (!M) {
     Err.print(argv[0], errs());