3afc3f43f0
Update writeThunkOrAlias to only create an alias or thunk if it is actually needed. Drop discardable linkone_odr functions if they are not used before. PR: https://github.com/llvm/llvm-project/pull/128865
50 lines
1.6 KiB
LLVM
50 lines
1.6 KiB
LLVM
; RUN: opt -S -passes=mergefunc < %s | FileCheck %s -implicit-check-not=funA -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.
|
|
|
|
define linkonce 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 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 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 -passes=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 ptr @funB
|
|
;.
|
|
; CHECK: @take_addr_of_funB = global ptr @funB
|
|
;.
|
|
; CHECK-LABEL: define private i32 @0(
|
|
; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
|
|
; CHECK-NEXT: [[SUM:%.*]] = add i32 [[X]], [[Y]]
|
|
; CHECK-NEXT: [[SUM2:%.*]] = add i32 [[X]], [[SUM]]
|
|
; CHECK-NEXT: [[SUM3:%.*]] = add i32 [[X]], [[SUM2]]
|
|
; CHECK-NEXT: ret i32 [[SUM3]]
|
|
;
|
|
;
|
|
; CHECK-LABEL: define linkonce i32 @funB(
|
|
; CHECK-SAME: i32 [[TMP0:%.*]], i32 [[TMP1:%.*]]) {
|
|
; CHECK-NEXT: [[TMP3:%.*]] = tail call i32 @0(i32 [[TMP0]], i32 [[TMP1]])
|
|
; CHECK-NEXT: ret i32 [[TMP3]]
|
|
;
|