================
@@ -2227,6 +2227,28 @@ LLVM_DUMP_METHOD void SourceManager::dump() const {
   }
 }
 
+static std::string NumberToHumanString(uint64_t Number) {
+  static constexpr std::array<std::pair<uint64_t, char>, 4> Units = {
+      {{1'000'000'000'000UL, 'T'},
+       {1'000'000'000UL, 'G'},
+       {1'000'000UL, 'M'},
+       {1'000UL, 'k'}}};
+
+  std::string HumanString;
+  llvm::raw_string_ostream HumanStringStream(HumanString);
+  for (const auto &[UnitSize, UnitSign] : Units) {
+    if (Number >= UnitSize) {
+      HumanStringStream << llvm::format(
----------------
ilya-biryukov wrote:

Suggestion: use `formatv` and it can convert to string directly.
```cpp
HumanString += llvm::formatv(...);
```

https://github.com/llvm/llvm-project/pull/114999
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