1; RUN: opt -called-value-propagation -S < %s | FileCheck %s
2
3target triple = "aarch64-unknown-linux-gnueabi"
4
5@global_function = internal unnamed_addr global void ()* null, align 8
6@global_scalar = internal unnamed_addr global i64 zeroinitializer
7
8; This test checks that we propagate the functions through a select
9; instruction, and attach !callees metadata to the call. Such metadata can
10; enable optimizations of this code sequence.
11;
12; For example, since both of the targeted functions have the "norecurse"
13; attribute, the function attributes pass can be made to infer that
14; "@test_select" is also norecurse. This would allow the globals optimizer to
15; localize "@global_scalar". The function could then be further simplified to
16; always return the constant "1", eliminating the load and store instructions.
17;
18; CHECK: call void %tmp0(), !callees ![[MD:[0-9]+]]
19; CHECK: ![[MD]] = !{void ()* @norecurse_1, void ()* @norecurse_2}
20;
21define i64 @test_select_entry(i1 %flag) {
22entry:
23  %tmp0 = call i64 @test_select(i1 %flag)
24  ret i64 %tmp0
25}
26
27define internal i64 @test_select(i1 %flag) {
28entry:
29  %tmp0 = select i1 %flag, void ()* @norecurse_1, void ()* @norecurse_2
30  store i64 1, i64* @global_scalar
31  call void %tmp0()
32  %tmp1 = load i64, i64* @global_scalar
33  ret i64 %tmp1
34}
35
36declare void @norecurse_1() #0
37declare void @norecurse_2() #0
38
39attributes #0 = { norecurse }
40