1; RUN: opt -S -passes=mergefunc < %s | FileCheck %s -implicit-check-not=funC 2 3; Replacments should be totally ordered on the function name. 4; If we don't do this we can end up with one module defining a thunk for @funA 5; and another module defining a thunk for @funB. 6; 7; The problem with this is that the linker could then choose these two stubs 8; each of the two modules and we end up with two stubs calling each other. 9 10; CHECK-LABEL: define linkonce_odr i32 @funA 11; CHECK-NEXT: add 12; CHECK: ret 13 14; CHECK-LABEL: define linkonce_odr i32 @funB 15; CHECK-NEXT: tail call i32 @funA(i32 %0, i32 %1) 16; CHECK-NEXT: ret 17 18define linkonce_odr i32 @funC(i32 %x, i32 %y) { 19 %sum = add i32 %x, %y 20 %sum2 = add i32 %x, %sum 21 %sum3 = add i32 %x, %sum2 22 ret i32 %sum3 23} 24 25define linkonce_odr i32 @funB(i32 %x, i32 %y) { 26 %sum = add i32 %x, %y 27 %sum2 = add i32 %x, %sum 28 %sum3 = add i32 %x, %sum2 29 ret i32 %sum3 30} 31 32define linkonce_odr i32 @funA(i32 %x, i32 %y) { 33 %sum = add i32 %x, %y 34 %sum2 = add i32 %x, %sum 35 %sum3 = add i32 %x, %sum2 36 ret i32 %sum3 37} 38 39; This creates a use of @funB, preventing -passes=mergefunc from deleting it. 40; @funC, however, can safely be deleted as it has no uses, and is discardable 41; if unused. 42@take_addr_of_funB = global ptr @funB 43