[NFC] Add a new Intrinsics.cpp file for intrinsic code

Add new file Intrinsics.cpp and move `lookupLLVMIntrinsicByName`
to that file.

Author: jurahul

llvm/include/llvm/IR/Intrinsics.h

@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // This file defines a set of enums which allow processing of intrinsic
-// functions.  Values of these enum types are returned by
+// functions. Values of these enum types are returned by
 // Function::getIntrinsicID.
 //
 //===----------------------------------------------------------------------===//

llvm/lib/IR/CMakeLists.txt

@@ -32,6 +32,7 @@ add_llvm_component_library(LLVMCore
   GCStrategy.cpp
   GVMaterializer.cpp
   Globals.cpp
+  Intrinsics.cpp
   IRBuilder.cpp
   IRPrintingPasses.cpp
   SSAContext.cpp

llvm/lib/IR/IntrinsicInst.cpp

@@ -236,48 +236,6 @@ void DbgAssignIntrinsic::setValue(Value *V) {
              MetadataAsValue::get(getContext(), ValueAsMetadata::get(V)));
 }
 
-int llvm::Intrinsic::lookupLLVMIntrinsicByName(ArrayRef<const char *> NameTable,
-                                               StringRef Name,
-                                               StringRef Target) {
-  assert(Name.starts_with("llvm.") && "Unexpected intrinsic prefix");
-  assert(Name.drop_front(5).starts_with(Target) && "Unexpected target");
-
-  // Do successive binary searches of the dotted name components. For
-  // "llvm.gc.experimental.statepoint.p1i8.p1i32", we will find the range of
-  // intrinsics starting with "llvm.gc", then "llvm.gc.experimental", then
-  // "llvm.gc.experimental.statepoint", and then we will stop as the range is
-  // size 1. During the search, we can skip the prefix that we already know is
-  // identical. By using strncmp we consider names with differing suffixes to
-  // be part of the equal range.
-  size_t CmpEnd = 4; // Skip the "llvm" component.
-  if (!Target.empty())
-    CmpEnd += 1 + Target.size(); // skip the .target component.
-
-  const char *const *Low = NameTable.begin();
-  const char *const *High = NameTable.end();
-  const char *const *LastLow = Low;
-  while (CmpEnd < Name.size() && High - Low > 0) {
-    size_t CmpStart = CmpEnd;
-    CmpEnd = Name.find('.', CmpStart + 1);
-    CmpEnd = CmpEnd == StringRef::npos ? Name.size() : CmpEnd;
-    auto Cmp = [CmpStart, CmpEnd](const char *LHS, const char *RHS) {
-      return strncmp(LHS + CmpStart, RHS + CmpStart, CmpEnd - CmpStart) < 0;
-    };
-    LastLow = Low;
-    std::tie(Low, High) = std::equal_range(Low, High, Name.data(), Cmp);
-  }
-  if (High - Low > 0)
-    LastLow = Low;
-
-  if (LastLow == NameTable.end())
-    return -1;
-  StringRef NameFound = *LastLow;
-  if (Name == NameFound ||
-      (Name.starts_with(NameFound) && Name[NameFound.size()] == '.'))
-    return LastLow - NameTable.begin();
-  return -1;
-}
-
 ConstantInt *InstrProfCntrInstBase::getNumCounters() const {
   if (InstrProfValueProfileInst::classof(this))
     llvm_unreachable("InstrProfValueProfileInst does not have counters!");

llvm/lib/IR/Intrinsics.cpp

@@ -0,0 +1,57 @@
+//===-- Intrinsics.cpp - Intrinsic Function Handling ------------*- 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 implements functions required for supporting intrinsic functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/Intrinsics.h"
+
+using namespace llvm;
+
+int llvm::Intrinsic::lookupLLVMIntrinsicByName(ArrayRef<const char *> NameTable,
+                                               StringRef Name,
+                                               StringRef Target) {
+  assert(Name.starts_with("llvm.") && "Unexpected intrinsic prefix");
+  assert(Name.drop_front(5).starts_with(Target) && "Unexpected target");
+
+  // Do successive binary searches of the dotted name components. For
+  // "llvm.gc.experimental.statepoint.p1i8.p1i32", we will find the range of
+  // intrinsics starting with "llvm.gc", then "llvm.gc.experimental", then
+  // "llvm.gc.experimental.statepoint", and then we will stop as the range is
+  // size 1. During the search, we can skip the prefix that we already know is
+  // identical. By using strncmp we consider names with differing suffixes to
+  // be part of the equal range.
+  size_t CmpEnd = 4; // Skip the "llvm" component.
+  if (!Target.empty())
+    CmpEnd += 1 + Target.size(); // skip the .target component.
+
+  const char *const *Low = NameTable.begin();
+  const char *const *High = NameTable.end();
+  const char *const *LastLow = Low;
+  while (CmpEnd < Name.size() && High - Low > 0) {
+    size_t CmpStart = CmpEnd;
+    CmpEnd = Name.find('.', CmpStart + 1);
+    CmpEnd = CmpEnd == StringRef::npos ? Name.size() : CmpEnd;
+    auto Cmp = [CmpStart, CmpEnd](const char *LHS, const char *RHS) {
+      return strncmp(LHS + CmpStart, RHS + CmpStart, CmpEnd - CmpStart) < 0;
+    };
+    LastLow = Low;
+    std::tie(Low, High) = std::equal_range(Low, High, Name.data(), Cmp);
+  }
+  if (High - Low > 0)
+    LastLow = Low;
+
+  if (LastLow == NameTable.end())
+    return -1;
+  StringRef NameFound = *LastLow;
+  if (Name == NameFound ||
+      (Name.starts_with(NameFound) && Name[NameFound.size()] == '.'))
+    return LastLow - NameTable.begin();
+  return -1;
+}