frame-01.ll
3.71 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
; Test the allocation of frames in cases where we do not need to save
; registers in the prologue.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare void @foo(i32 *)
; The CFA offset is 160 (the caller-allocated part of the frame) + 168.
define void @f1(i64 %x) {
; CHECK-LABEL: f1:
; CHECK: aghi %r15, -168
; CHECK: .cfi_def_cfa_offset 328
; CHECK: stg %r2, 160(%r15)
; CHECK: aghi %r15, 168
; CHECK: br %r14
%y = alloca i64, align 8
store volatile i64 %x, i64* %y
ret void
}
; Check frames of size 32760, which is the largest size that can be both
; allocated and freed using AGHI. This size is big enough to require
; two emergency spill slots at 160(%r15), for instructions with unsigned
; 12-bit offsets that end up being out of range. Fill the remaining
; 32760 - 176 bytes by allocating (32760 - 176) / 8 = 4073 doublewords.
define void @f2(i64 %x) {
; CHECK-LABEL: f2:
; CHECK: aghi %r15, -32760
; CHECK: .cfi_def_cfa_offset 32920
; CHECK: stg %r2, 176(%r15)
; CHECK: aghi %r15, 32760
; CHECK: br %r14
%y = alloca [4073 x i64], align 8
%ptr = getelementptr inbounds [4073 x i64], [4073 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; Allocate one more doubleword. This is the one frame size that we can
; allocate using AGHI but must free using AGFI.
define void @f3(i64 %x) {
; CHECK-LABEL: f3:
; CHECK: aghi %r15, -32768
; CHECK: .cfi_def_cfa_offset 32928
; CHECK: stg %r2, 176(%r15)
; CHECK: agfi %r15, 32768
; CHECK: br %r14
%y = alloca [4074 x i64], align 8
%ptr = getelementptr inbounds [4074 x i64], [4074 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; Allocate another doubleword on top of that. The allocation and free
; must both use AGFI.
define void @f4(i64 %x) {
; CHECK-LABEL: f4:
; CHECK: agfi %r15, -32776
; CHECK: .cfi_def_cfa_offset 32936
; CHECK: stg %r2, 176(%r15)
; CHECK: agfi %r15, 32776
; CHECK: br %r14
%y = alloca [4075 x i64], align 8
%ptr = getelementptr inbounds [4075 x i64], [4075 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; The largest size that can be both allocated and freed using AGFI.
; At this point the frame is too big to represent properly in the CFI.
define void @f5(i64 %x) {
; CHECK-LABEL: f5:
; CHECK: agfi %r15, -2147483640
; CHECK: stg %r2, 176(%r15)
; CHECK: agfi %r15, 2147483640
; CHECK: br %r14
%y = alloca [268435433 x i64], align 8
%ptr = getelementptr inbounds [268435433 x i64], [268435433 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; The only frame size that can be allocated using a single AGFI but which
; must be freed using two instructions.
define void @f6(i64 %x) {
; CHECK-LABEL: f6:
; CHECK: agfi %r15, -2147483648
; CHECK: stg %r2, 176(%r15)
; CHECK: agfi %r15, 2147483640
; CHECK: aghi %r15, 8
; CHECK: br %r14
%y = alloca [268435434 x i64], align 8
%ptr = getelementptr inbounds [268435434 x i64], [268435434 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; The smallest frame size that needs two instructions to both allocate
; and free the frame.
define void @f7(i64 %x) {
; CHECK-LABEL: f7:
; CHECK: agfi %r15, -2147483648
; CHECK: aghi %r15, -8
; CHECK: stg %r2, 176(%r15)
; CHECK: agfi %r15, 2147483640
; CHECK: aghi %r15, 16
; CHECK: br %r14
%y = alloca [268435435 x i64], align 8
%ptr = getelementptr inbounds [268435435 x i64], [268435435 x i64]* %y, i64 0, i64 0
store volatile i64 %x, i64* %ptr
ret void
}
; Make sure that LA can be rematerialized.
define void @f8() {
; CHECK-LABEL: f8:
; CHECK: la %r2, 164(%r15)
; CHECK: brasl %r14, foo@PLT
; CHECK: la %r2, 164(%r15)
; CHECK: brasl %r14, foo@PLT
; CHECK: br %r14
%ptr = alloca i32
call void @foo(i32 *%ptr)
call void @foo(i32 *%ptr)
ret void
}