Remove the very substantial, largely unmaintained legacy PGO

infrastructure.

This was essentially work toward PGO based on a design that had several
flaws, partially dating from a time when LLVM had a different
architecture, and with an effort to modernize it abandoned without being
completed. Since then, it has bitrotted for several years further. The
result is nearly unusable, and isn't helping any of the modern PGO
efforts. Instead, it is getting in the way, adding confusion about PGO
in LLVM and distracting everyone with maintenance on essentially dead
code. Removing it paves the way for modern efforts around PGO.

Among other effects, this removes the last of the runtime libraries from
LLVM. Those are being developed in the separate 'compiler-rt' project
now, with somewhat different licensing specifically more approriate for
runtimes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191835 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -246,18 +246,13 @@ if( WIN32 AND NOT CYGWIN )
 endif()
 
 # Define options to control the inclusion and default build behavior for
-# components which may not strictly be necessary (tools, runtime, examples, and
-# tests).
+# components which may not strictly be necessary (tools, examples, and tests).
 #
 # This is primarily to support building smaller or faster project files.
 option(LLVM_INCLUDE_TOOLS "Generate build targets for the LLVM tools." ON)
 option(LLVM_BUILD_TOOLS
   "Build the LLVM tools. If OFF, just generate build targets." ON)
 
-option(LLVM_INCLUDE_RUNTIME "Generate build targets for the LLVM runtimes" ON)
-option(LLVM_BUILD_RUNTIME
-  "Build the LLVM runtime libraries. If OFF, just generate build targets." ON)
-
 option(LLVM_BUILD_EXAMPLES
   "Build the LLVM example programs. If OFF, just generate build targets." OFF)
 option(LLVM_INCLUDE_EXAMPLES "Generate build targets for the LLVM examples" ON)
@@ -471,10 +466,6 @@ if( LLVM_INCLUDE_TOOLS )
   add_subdirectory(tools)
 endif()
 
-if( LLVM_INCLUDE_RUNTIME )
-  add_subdirectory(runtime)
-endif()
-
 if( LLVM_INCLUDE_EXAMPLES )
   add_subdirectory(examples)
 endif()

LLVMBuild.txt

@@ -16,7 +16,7 @@
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = bindings docs examples lib projects runtime tools utils
+subdirectories = bindings docs examples lib projects tools utils
 
 [component_0]
 type = Group

Makefile

@@ -15,7 +15,7 @@ LEVEL := .
 #   3. Build IR, which builds the Intrinsics.inc file used by libs.
 #   4. Build libs, which are needed by llvm-config.
 #   5. Build llvm-config, which determines inter-lib dependencies for tools.
-#   6. Build tools, runtime, docs.
+#   6. Build tools and docs.
 #
 # When cross-compiling, there are some things (tablegen) that need to
 # be build for the build system first.
@@ -31,7 +31,7 @@ ifeq ($(BUILD_DIRS_ONLY),1)
   OPTIONAL_DIRS := tools/clang/utils/TableGen
 else
   DIRS := lib/Support lib/TableGen utils lib/IR lib tools/llvm-shlib \
-          tools/llvm-config tools runtime docs unittests
+          tools/llvm-config tools docs unittests
   OPTIONAL_DIRS := projects bindings
 endif
 
@@ -52,17 +52,17 @@ ifneq ($(ENABLE_DOCS),1)
 endif
 
 ifeq ($(MAKECMDGOALS),libs-only)
-  DIRS := $(filter-out tools runtime docs, $(DIRS))
+  DIRS := $(filter-out tools docs, $(DIRS))
   OPTIONAL_DIRS :=
 endif
 
 ifeq ($(MAKECMDGOALS),install-libs)
-  DIRS := $(filter-out tools runtime docs, $(DIRS))
+  DIRS := $(filter-out tools docs, $(DIRS))
   OPTIONAL_DIRS := $(filter bindings, $(OPTIONAL_DIRS))
 endif
 
 ifeq ($(MAKECMDGOALS),tools-only)
-  DIRS := $(filter-out runtime docs, $(DIRS))
+  DIRS := $(filter-out docs, $(DIRS))
   OPTIONAL_DIRS :=
 endif
 
@@ -72,7 +72,7 @@ ifeq ($(MAKECMDGOALS),install-clang)
           tools/clang/tools/c-index-test \
           tools/clang/include/clang-c \
           tools/clang/runtime tools/clang/docs \
-          tools/lto runtime
+          tools/lto
   OPTIONAL_DIRS :=
   NO_INSTALL = 1
 endif
@@ -84,7 +84,7 @@ ifeq ($(MAKECMDGOALS),clang-only)
 endif
 
 ifeq ($(MAKECMDGOALS),unittests)
-  DIRS := $(filter-out tools runtime docs, $(DIRS)) utils unittests
+  DIRS := $(filter-out tools docs, $(DIRS)) utils unittests
   OPTIONAL_DIRS :=
 endif
 

include/llvm/Analysis/Passes.h

@@ -93,64 +93,6 @@ namespace llvm {
   //
   ImmutablePass *createObjCARCAliasAnalysisPass();
 
-  //===--------------------------------------------------------------------===//
-  //
-  // createProfileLoaderPass - This pass loads information from a profile dump
-  // file.
-  //
-  ModulePass *createProfileLoaderPass();
-  extern char &ProfileLoaderPassID;
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createProfileMetadataLoaderPass - This pass loads information from a
-  // profile dump file and sets branch weight metadata.
-  //
-  ModulePass *createProfileMetadataLoaderPass();
-  extern char &ProfileMetadataLoaderPassID;
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createNoProfileInfoPass - This pass implements the default "no profile".
-  //
-  ImmutablePass *createNoProfileInfoPass();
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createProfileEstimatorPass - This pass estimates profiling information
-  // instead of loading it from a previous run.
-  //
-  FunctionPass *createProfileEstimatorPass();
-  extern char &ProfileEstimatorPassID;
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createProfileVerifierPass - This pass verifies profiling information.
-  //
-  FunctionPass *createProfileVerifierPass();
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createPathProfileLoaderPass - This pass loads information from a path
-  // profile dump file.
-  //
-  ModulePass *createPathProfileLoaderPass();
-  extern char &PathProfileLoaderPassID;
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createNoPathProfileInfoPass - This pass implements the default
-  // "no path profile".
-  //
-  ImmutablePass *createNoPathProfileInfoPass();
-
-  //===--------------------------------------------------------------------===//
-  //
-  // createPathProfileVerifierPass - This pass verifies path profiling
-  // information.
-  //
-  ModulePass *createPathProfileVerifierPass();
-
   //===--------------------------------------------------------------------===//
   //
   // createDSAAPass - This pass implements simple context sensitive alias