[llvm] 24bd9bc - [Timer] Remove signpots overhead on unsupported systems

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2025-01-10T20:46:57-08:00
New Revision: 24bd9bc0b59d51c82e9a4d84c21d86d58d0ef6ce

URL: https://github.com/llvm/llvm-project/commit/24bd9bc0b59d51c82e9a4d84c21d86d58d0ef6ce
DIFF: https://github.com/llvm/llvm-project/commit/24bd9bc0b59d51c82e9a4d84c21d86d58d0ef6ce.diff

LOG: [Timer] Remove signpots overhead on unsupported systems

startTimer/stopTimer are frequently called. It's important to reduce
overhead.

Added: 
    

Modified: 
    llvm/lib/Support/Timer.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
index fbf3becf39fa13..089dae2886f228 100644
--- a/llvm/lib/Support/Timer.cpp
+++ b/llvm/lib/Support/Timer.cpp
@@ -53,6 +53,7 @@ class Name2PairMap;
 static std::string &libSupportInfoOutputFilename();
 static bool trackSpace();
 static bool sortTimers();
+[[maybe_unused]]
 static SignpostEmitter &signposts();
 static sys::SmartMutex<true> &timerLock();
 static TimerGroup &defaultTimerGroup();
@@ -149,7 +150,9 @@ TimeRecord TimeRecord::getCurrentTime(bool Start) {
 void Timer::startTimer() {
   assert(!Running && "Cannot start a running timer");
   Running = Triggered = true;
+#if LLVM_SUPPORT_XCODE_SIGNPOSTS
   signposts().startInterval(this, getName());
+#endif
   StartTime = TimeRecord::getCurrentTime(true);
 }
 
@@ -158,7 +161,9 @@ void Timer::stopTimer() {
   Running = false;
   Time += TimeRecord::getCurrentTime(false);
   Time -= StartTime;
+#if LLVM_SUPPORT_XCODE_SIGNPOSTS
   signposts().endInterval(this, getName());
+#endif
 }
 
 void Timer::clear() {