1; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers | FileCheck %s
2
3; Test that the "returned" attribute is optimized effectively.
4
5target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
6target triple = "wasm32-unknown-unknown"
7
8; CHECK-LABEL: _Z3foov:
9; CHECK-NEXT: .functype _Z3foov () -> (i32){{$}}
10; CHECK-NEXT: i32.const $push0=, 1{{$}}
11; CHECK-NEXT: {{^}} call      $push1=, _Znwm, $pop0{{$}}
12; CHECK-NEXT: {{^}} call      $push2=, _ZN5AppleC1Ev, $pop1{{$}}
13; CHECK-NEXT: return    $pop2{{$}}
14%class.Apple = type { i8 }
15declare noalias i8* @_Znwm(i32)
16declare %class.Apple* @_ZN5AppleC1Ev(%class.Apple* returned)
17define %class.Apple* @_Z3foov() {
18entry:
19  %call = tail call noalias i8* @_Znwm(i32 1)
20  %0 = bitcast i8* %call to %class.Apple*
21  %call1 = tail call %class.Apple* @_ZN5AppleC1Ev(%class.Apple* %0)
22  ret %class.Apple* %0
23}
24
25; CHECK-LABEL: _Z3barPvS_l:
26; CHECK-NEXT: .functype _Z3barPvS_l (i32, i32, i32) -> (i32){{$}}
27; CHECK-NEXT: {{^}} call     $push0=, memcpy, $0, $1, $2{{$}}
28; CHECK-NEXT: return   $pop0{{$}}
29declare i8* @memcpy(i8* returned, i8*, i32)
30define i8* @_Z3barPvS_l(i8* %p, i8* %s, i32 %n) {
31entry:
32  %call = tail call i8* @memcpy(i8* %p, i8* %s, i32 %n)
33  ret i8* %p
34}
35
36; Test that the optimization isn't performed on constant arguments.
37
38; CHECK-LABEL: test_constant_arg:
39; CHECK:      i32.const   $push0=, global{{$}}
40; CHECK-NEXT: {{^}} call        $drop=, returns_arg, $pop0{{$}}
41; CHECK-NEXT: return{{$}}
42@global = external global i32
43@addr = global i32* @global
44define void @test_constant_arg() {
45  %call = call i32* @returns_arg(i32* @global)
46  ret void
47}
48declare i32* @returns_arg(i32* returned)
49
50; Test that the optimization isn't performed on arguments without the
51; "returned" attribute.
52
53; CHECK-LABEL: test_other_skipped:
54; CHECK-NEXT: .functype test_other_skipped (i32, i32, f64) -> (){{$}}
55; CHECK-NEXT: {{^}} call     $drop=, do_something, $0, $1, $2{{$}}
56; CHECK-NEXT: {{^}} call     do_something_with_i32, $1{{$}}
57; CHECK-NEXT: {{^}} call     do_something_with_double, $2{{$}}
58declare i32 @do_something(i32 returned, i32, double)
59declare void @do_something_with_i32(i32)
60declare void @do_something_with_double(double)
61define void @test_other_skipped(i32 %a, i32 %b, double %c) {
62    %call = call i32 @do_something(i32 %a, i32 %b, double %c)
63    call void @do_something_with_i32(i32 %b)
64    call void @do_something_with_double(double %c)
65    ret void
66}
67
68; Test that the optimization is performed on arguments other than the first.
69
70; CHECK-LABEL: test_second_arg:
71; CHECK-NEXT: .functype test_second_arg (i32, i32) -> (i32){{$}}
72; CHECK-NEXT: {{^}} call     $push0=, do_something_else, $0, $1{{$}}
73; CHECK-NEXT: return   $pop0{{$}}
74declare i32 @do_something_else(i32, i32 returned)
75define i32 @test_second_arg(i32 %a, i32 %b) {
76    %call = call i32 @do_something_else(i32 %a, i32 %b)
77    ret i32 %b
78}
79