| ; 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 |
| ; and another module defining a thunk for @funB. |
| ; |
| ; The problem with this is that the linker could then choose these two stubs |
| ; each of the two modules and we end up with two stubs calling each other. |
| |
| ; CHECK-LABEL: define linkonce_odr i32 @funA |
| ; CHECK-NEXT: add |
| ; CHECK: ret |
| |
| ; CHECK-LABEL: define linkonce_odr i32 @funB |
| ; 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 |
| } |
| |
| define linkonce_odr i32 @funA(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*) |