[LTO] Add an early run of functionattrs

Because we internalize early, we can potentially mark a bunch of functions as norecurse. Do this before globalopt. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253451 91177308-0d34-0410-b5e6-96231b3b80d8
apuder · Nov 18, 2015 · 683e0e5 · 683e0e5
1 parent 51f7c58
commit 683e0e5
Show file tree

Hide file tree

Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -482,6 +482,7 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
   PM.add(createIPSCCPPass());
 
   // Now that we internalized some globals, see if we can hack on them!
+  PM.add(createFunctionAttrsPass()); // Add norecurse if possible.
   PM.add(createGlobalOptimizerPass());
 
   // Linking modules together can lead to duplicated global constants, only

diff --git a/test/LTO/X86/diagnostic-handler-remarks.ll b/test/LTO/X86/diagnostic-handler-remarks.ll
@@ -32,8 +32,11 @@
 
 target triple = "x86_64-apple-darwin"
 
+declare i32 @bar()
+
 define i32 @foo() {
-  ret i32 7
+  %a = call i32 @bar()
+  ret i32 %a
 }
 
 define i32 @main() {