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Matthias Braun74a0bd32016-04-13 21:43:16 +00001; RUN: llc -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT %s
Amara Emerson854d10d2018-01-02 16:30:47 +00002; RUN: llc -O0 -fast-isel -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck %s
Matthias Braun74a0bd32016-04-13 21:43:16 +00003; RUN: llc -verify-machineinstrs -mtriple=aarch64-unknown-linux-gnu -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT %s
Manman Renf46262e2016-03-29 17:37:21 +00004
Matthias Braun74a0bd32016-04-13 21:43:16 +00005; Parameter with swiftself should be allocated to x20.
6; CHECK-LABEL: swiftself_param:
7; CHECK: mov x0, x20
8; CHECK-NEXT: ret
9define i8* @swiftself_param(i8* swiftself %addr0) {
10 ret i8 *%addr0
Manman Renf46262e2016-03-29 17:37:21 +000011}
12
Matthias Braun74a0bd32016-04-13 21:43:16 +000013; Check that x20 is used to pass a swiftself argument.
14; CHECK-LABEL: call_swiftself:
15; CHECK: mov x20, x0
16; CHECK: bl {{_?}}swiftself_param
17; CHECK: ret
18define i8 *@call_swiftself(i8* %arg) {
19 %res = call i8 *@swiftself_param(i8* swiftself %arg)
20 ret i8 *%res
21}
Manman Renf46262e2016-03-29 17:37:21 +000022
Matthias Braun74a0bd32016-04-13 21:43:16 +000023; x20 should be saved by the callee even if used for swiftself
24; CHECK-LABEL: swiftself_clobber:
25; CHECK: {{stp|str}} {{.*}}x20{{.*}}sp
26; ...
27; CHECK: {{ldp|ldr}} {{.*}}x20{{.*}}sp
28; CHECK: ret
29define i8 *@swiftself_clobber(i8* swiftself %addr0) {
30 call void asm sideeffect "", "~{x20}"()
31 ret i8 *%addr0
32}
Manman Renf46262e2016-03-29 17:37:21 +000033
Matthias Braun74a0bd32016-04-13 21:43:16 +000034; Demonstrate that we do not need any movs when calling multiple functions
35; with swiftself argument.
36; CHECK-LABEL: swiftself_passthrough:
37; OPT-NOT: mov{{.*}}x20
38; OPT: bl {{_?}}swiftself_param
39; OPT-NOT: mov{{.*}}x20
40; OPT-NEXT: bl {{_?}}swiftself_param
41; OPT: ret
42define void @swiftself_passthrough(i8* swiftself %addr0) {
43 call i8 *@swiftself_param(i8* swiftself %addr0)
44 call i8 *@swiftself_param(i8* swiftself %addr0)
Manman Renf46262e2016-03-29 17:37:21 +000045 ret void
46}
Matthias Braun74a0bd32016-04-13 21:43:16 +000047
48; We can use a tail call if the callee swiftself is the same as the caller one.
49; CHECK-LABEL: swiftself_tail:
50; OPT: b {{_?}}swiftself_param
51; OPT-NOT: ret
52define i8* @swiftself_tail(i8* swiftself %addr0) {
53 call void asm sideeffect "", "~{x20}"()
54 %res = tail call i8* @swiftself_param(i8* swiftself %addr0)
55 ret i8* %res
56}
57
58; We can not use a tail call if the callee swiftself is not the same as the
59; caller one.
60; CHECK-LABEL: swiftself_notail:
61; CHECK: mov x20, x0
62; CHECK: bl {{_?}}swiftself_param
63; CHECK: ret
64define i8* @swiftself_notail(i8* swiftself %addr0, i8* %addr1) nounwind {
65 %res = tail call i8* @swiftself_param(i8* swiftself %addr1)
66 ret i8* %res
67}
Arnold Schwaighoferdb7bbcb2017-02-08 22:30:47 +000068
69; We cannot pretend that 'x0' is alive across the thisreturn_attribute call as
70; we normally would. We marked the first parameter with swiftself which means it
71; will no longer be passed in x0.
72declare swiftcc i8* @thisreturn_attribute(i8* returned swiftself)
73; OPT-LABEL: swiftself_nothisreturn:
74; OPT-DAG: ldr x20, [x20]
75; OPT-DAG: mov [[CSREG:x[1-9].*]], x8
76; OPT: bl {{_?}}thisreturn_attribute
77; OPT: str x0, {{\[}}[[CSREG]]
78; OPT: ret
79define hidden swiftcc void @swiftself_nothisreturn(i8** noalias nocapture sret, i8** noalias nocapture readonly swiftself) {
80entry:
81 %2 = load i8*, i8** %1, align 8
82 %3 = tail call swiftcc i8* @thisreturn_attribute(i8* swiftself %2)
83 store i8* %3, i8** %0, align 8
84 ret void
85}