[OptTable] Precompute OptTable prefixes union table through tablegen

This avoid rediscovering this table when reading each options, providing
a sensible 2% speedup when processing and empty file, and a measurable
speedup on typical workloads, see:

This is optional, the legacy, on-the-fly, approach can still be used
through the GenericOptTable class, while the new one is used through
PrecomputedOptTable.

https://llvm-compile-time-tracker.com/compare.php?from=4da6cb3202817ee2897d6b690e4af950459caea4&to=19a492b704e8f5c1dea120b9c0d3859bd78796be&stat=instructions:u

Differential Revision: https://reviews.llvm.org/D140800

1 files changed, 9 insertions, 8 deletions

diff --git a/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp b/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
index 3a970e2..577b837 100644
--- a/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
+++ b/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
@@ -56,9 +56,9 @@ static constexpr opt::OptTable::Info ObjcopyInfoTable[] = {
 };
 } // namespace objcopy_opt
 
-class ObjcopyOptTable : public opt::OptTable {
+class ObjcopyOptTable : public opt::GenericOptTable {
 public:
-  ObjcopyOptTable() : OptTable(objcopy_opt::ObjcopyInfoTable) {
+  ObjcopyOptTable() : opt::GenericOptTable(objcopy_opt::ObjcopyInfoTable) {
     setGroupedShortOptions(true);
   }
 };
@@ -101,10 +101,10 @@ static constexpr opt::OptTable::Info InstallNameToolInfoTable[] = {
 };
 } // namespace install_name_tool
 
-class InstallNameToolOptTable : public opt::OptTable {
+class InstallNameToolOptTable : public opt::GenericOptTable {
 public:
   InstallNameToolOptTable()
-      : OptTable(install_name_tool::InstallNameToolInfoTable) {}
+      : GenericOptTable(install_name_tool::InstallNameToolInfoTable) {}
 };
 
 enum BitcodeStripID {
@@ -145,9 +145,10 @@ static constexpr opt::OptTable::Info BitcodeStripInfoTable[] = {
 };
 } // namespace bitcode_strip
 
-class BitcodeStripOptTable : public opt::OptTable {
+class BitcodeStripOptTable : public opt::GenericOptTable {
 public:
-  BitcodeStripOptTable() : OptTable(bitcode_strip::BitcodeStripInfoTable) {}
+  BitcodeStripOptTable()
+      : opt::GenericOptTable(bitcode_strip::BitcodeStripInfoTable) {}
 };
 
 enum StripID {
@@ -179,9 +180,9 @@ static constexpr opt::OptTable::Info StripInfoTable[] = {
 };
 } // namespace strip
 
-class StripOptTable : public opt::OptTable {
+class StripOptTable : public opt::GenericOptTable {
 public:
-  StripOptTable() : OptTable(strip::StripInfoTable) {
+  StripOptTable() : GenericOptTable(strip::StripInfoTable) {
     setGroupedShortOptions(true);
   }
 };