Micro optimized some formatter flags

include/spdlog/details/pattern_formatter.h

@@ -447,13 +447,19 @@ public:
         : flag_formatter(padinfo){};
 
     void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
+    {
+        auto millis = fmt_helper::time_fraction<std::chrono::milliseconds>(msg.time);
+        if (padinfo_.width_)
         {
             const size_t field_size = 3;
             scoped_pad p(field_size, padinfo_, dest);
-
-        auto millis = fmt_helper::time_fraction<std::chrono::milliseconds>(msg.time);
             fmt_helper::pad3(static_cast<uint32_t>(millis.count()), dest);
         }
+        else
+        {
+            fmt_helper::pad3(static_cast<uint32_t>(millis.count()), dest);
+        }
+    }
 };
 
 // microseconds
@@ -464,13 +470,19 @@ public:
         : flag_formatter(padinfo){};
 
     void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
+    {
+        auto micros = fmt_helper::time_fraction<std::chrono::microseconds>(msg.time);
+        if (padinfo_.width_)
         {
             const size_t field_size = 6;
             scoped_pad p(field_size, padinfo_, dest);
-
-        auto micros = fmt_helper::time_fraction<std::chrono::microseconds>(msg.time);
             fmt_helper::pad6(static_cast<size_t>(micros.count()), dest);
         }
+        else
+        {
+            fmt_helper::pad6(static_cast<size_t>(micros.count()), dest);
+        }
+    }
 };
 
 // nanoseconds
@@ -481,13 +493,19 @@ public:
         : flag_formatter(padinfo){};
 
     void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
+    {
+        auto ns = fmt_helper::time_fraction<std::chrono::nanoseconds>(msg.time);
+        if (padinfo_.width_)
         {
             const size_t field_size = 9;
             scoped_pad p(field_size, padinfo_, dest);
-
-        auto ns = fmt_helper::time_fraction<std::chrono::nanoseconds>(msg.time);
             fmt_helper::pad9(static_cast<size_t>(ns.count()), dest);
         }
+        else
+        {
+            fmt_helper::pad9(static_cast<size_t>(ns.count()), dest);
+        }
+    }
 };
 
 // seconds since epoch
@@ -651,11 +669,18 @@ public:
         : flag_formatter(padinfo){};
 
     void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
+    {
+        if (padinfo_.width_)
         {
             const auto field_size = fmt_helper::count_digits(msg.thread_id);
             scoped_pad p(field_size, padinfo_, dest);
             fmt_helper::append_int(msg.thread_id, dest);
         }
+        else
+        {
+            fmt_helper::append_int(msg.thread_id, dest);
+        }
+    }
 };
 
 // Current pid
@@ -668,10 +693,17 @@ public:
     void format(const details::log_msg &, const std::tm &, fmt::memory_buffer &dest) override
     {
         const auto pid = static_cast<uint32_t>(details::os::pid());
+        if (padinfo_.width_)
+        {
             const size_t field_size = fmt::internal::count_digits(pid);
             scoped_pad p(field_size, padinfo_, dest);
             fmt_helper::append_int(pid, dest);
         }
+        else
+        {
+            fmt_helper::append_int(pid, dest);
+        }
+    }
 };
 
 // message counter formatter