ThinLTO: do not import function whose linkage prevents inlining.

There is not point in importing a "weak" or a "linkonce" function
since we won't be able to inline it anyway.
We already had a targeted check for WeakAny, this is using the
same check on GlobalValue as the inline, i.e.
isMayBeOverriddenLinkage()

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 268315

2 files changed, 10 insertions, 0 deletions

diff --git a/llvm/test/Transforms/FunctionImport/Inputs/funcimport.ll b/llvm/test/Transforms/FunctionImport/Inputs/funcimport.ll
index 03ea3647fd7..fa96b8ea266 100644
--- a/llvm/test/Transforms/FunctionImport/Inputs/funcimport.ll
+++ b/llvm/test/Transforms/FunctionImport/Inputs/funcimport.ll
@@ -75,6 +75,11 @@ entry:
   ret void
 }
 
+define linkonce void @linkoncefunc2() #0 {
+entry:
+  ret void
+}
+
 define internal i32 @staticfunc() #0 {
 entry:
   ret i32 1
diff --git a/llvm/test/Transforms/FunctionImport/funcimport.ll b/llvm/test/Transforms/FunctionImport/funcimport.ll
index f0df3200555..478613a2475 100644
--- a/llvm/test/Transforms/FunctionImport/funcimport.ll
+++ b/llvm/test/Transforms/FunctionImport/funcimport.ll
@@ -28,6 +28,7 @@ entry:
   call void (...) @setfuncptr()
   call void (...) @callfuncptr()
   call void (...) @weakfunc()
+  call void (...) @linkoncefunc2()
   call void (...) @referencelargelinkonce()
   ret i32 0
 }
@@ -94,6 +95,10 @@ declare void @referencelargelinkonce(...)
 ; CHECK-DAG: declare void @weakfunc(...)
 declare void @weakfunc(...) #1
 
+; Won't import linkonce func
+; CHECK-DAG: declare void @linkoncefunc2(...)
+declare void @linkoncefunc2(...) #1
+
 ; INSTLIMDEF-DAG: Import funcwithpersonality
 ; INSTLIMDEF-DAG: define available_externally hidden void @funcwithpersonality.llvm.{{.*}}() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
 ; INSTLIM5-DAG: declare hidden void @funcwithpersonality.llvm.{{.*}}()