// If G was internal then we may have replaced all uses of G with F. If so,
// stop here and delete G. There's no need for a thunk. (See note on
// MergeFunctionsPDI above).
- if (G->hasLocalLinkage() && G->use_empty() && !MergeFunctionsPDI) {
+ if (G->isDiscardableIfUnused() && G->use_empty() && !MergeFunctionsPDI) {
G->eraseFromParent();
++NumFunctionsMerged;
return;
-; RUN: opt -S -mergefunc < %s | FileCheck %s
+; RUN: opt -S -mergefunc < %s | FileCheck %s -implicit-check-not=funC
; Replacments should be totally ordered on the function name.
; If we don't do this we can end up with one module defining a thunk for @funA
; CHECK-NEXT: tail call i32 @funA(i32 %0, i32 %1)
; CHECK-NEXT: ret
+define linkonce_odr i32 @funC(i32 %x, i32 %y) {
+ %sum = add i32 %x, %y
+ %sum2 = add i32 %x, %sum
+ %sum3 = add i32 %x, %sum2
+ ret i32 %sum3
+}
+
define linkonce_odr i32 @funB(i32 %x, i32 %y) {
%sum = add i32 %x, %y
%sum2 = add i32 %x, %sum
%sum3 = add i32 %x, %sum2
ret i32 %sum3
}
+
+; This creates a use of @funB, preventing -mergefunc from deleting it.
+; @funC, however, can safely be deleted as it has no uses, and is discardable
+; if unused.
+@take_addr_of_funB = global i8* bitcast (i32 (i32, i32)* @funB to i8*)