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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
; RUN: llc < %s -mtriple=i386-linux | FileCheck %s -check-prefix=X86-32
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s -check-prefix=X86-64
declare i32 @get_val()
declare void @use_val(i32)
declare i1 @setjmp()
declare void @longjmp()
declare void @personality()
; Test that llc avoids reusing spill slots in functions that call
; setjmp(), whether they use "call" or "invoke" for calling setjmp()
; (PR18244).
define void @setjmp_caller() {
; X86-32-LABEL: setjmp_caller:
; X86-64-LABEL: setjmp_caller:
; This code keeps enough variables live across the setjmp() call that
; they don't all fit in registers and the compiler will allocate a
; spill slot.
%a1 = call i32 @get_val()
%a2 = call i32 @get_val()
%a3 = call i32 @get_val()
%a4 = call i32 @get_val()
%a5 = call i32 @get_val()
%a6 = call i32 @get_val()
%a7 = call i32 @get_val()
%a8 = call i32 @get_val()
; X86-32: movl %eax, [[SPILL_SLOT:[0-9]+]](%esp)
; X86-32: calll get_val
; X86-64: movl %eax, [[SPILL_SLOT:[0-9]+]](%rsp)
; X86-64: callq get_val
%setjmp_result = call i1 @setjmp() returns_twice
br i1 %setjmp_result, label %second, label %first
; X86-32: calll setjmp
; X86-64: callq setjmp
; Again, keep enough variables live that they need spill slots. Since
; this function calls a returns_twice function (setjmp()), the
; compiler should not reuse the spill slots. longjmp() can return to
; where the first spill slots were still live.
first:
%b1 = call i32 @get_val()
%b2 = call i32 @get_val()
%b3 = call i32 @get_val()
%b4 = call i32 @get_val()
%b5 = call i32 @get_val()
%b6 = call i32 @get_val()
%b7 = call i32 @get_val()
%b8 = call i32 @get_val()
call void @use_val(i32 %b1)
call void @use_val(i32 %b2)
call void @use_val(i32 %b3)
call void @use_val(i32 %b4)
call void @use_val(i32 %b5)
call void @use_val(i32 %b6)
call void @use_val(i32 %b7)
call void @use_val(i32 %b8)
call void @longjmp()
unreachable
; X86-32-NOT: movl {{.*}}, [[SPILL_SLOT]](%esp)
; X86-64-NOT: movl {{.*}}, [[SPILL_SLOT]](%rsp)
second:
call void @use_val(i32 %a1)
call void @use_val(i32 %a2)
call void @use_val(i32 %a3)
call void @use_val(i32 %a4)
call void @use_val(i32 %a5)
call void @use_val(i32 %a6)
call void @use_val(i32 %a7)
call void @use_val(i32 %a8)
ret void
}
; This is the same as above, but using "invoke" rather than "call" to
; call setjmp().
define void @setjmp_invoker() {
; X86-32-LABEL: setjmp_invoker:
; X86-64-LABEL: setjmp_invoker:
%a1 = call i32 @get_val()
%a2 = call i32 @get_val()
%a3 = call i32 @get_val()
%a4 = call i32 @get_val()
%a5 = call i32 @get_val()
%a6 = call i32 @get_val()
%a7 = call i32 @get_val()
%a8 = call i32 @get_val()
; X86-32: movl %eax, [[SPILL_SLOT:[0-9]+]](%esp)
; X86-32: calll get_val
; X86-64: movl %eax, [[SPILL_SLOT:[0-9]+]](%rsp)
; X86-64: callq get_val
%setjmp_result = invoke i1 @setjmp() returns_twice
to label %cont unwind label %lpad
; X86-32: calll setjmp
; X86-64: callq setjmp
cont:
br i1 %setjmp_result, label %second, label %first
lpad:
%lp = landingpad { i8*, i32 } personality void ()* @personality cleanup
unreachable
first:
%b1 = call i32 @get_val()
%b2 = call i32 @get_val()
%b3 = call i32 @get_val()
%b4 = call i32 @get_val()
%b5 = call i32 @get_val()
%b6 = call i32 @get_val()
%b7 = call i32 @get_val()
%b8 = call i32 @get_val()
call void @use_val(i32 %b1)
call void @use_val(i32 %b2)
call void @use_val(i32 %b3)
call void @use_val(i32 %b4)
call void @use_val(i32 %b5)
call void @use_val(i32 %b6)
call void @use_val(i32 %b7)
call void @use_val(i32 %b8)
call void @longjmp()
unreachable
; X86-32-NOT: movl {{.*}}, [[SPILL_SLOT]](%esp)
; X86-64-NOT: movl {{.*}}, [[SPILL_SLOT]](%rsp)
second:
call void @use_val(i32 %a1)
call void @use_val(i32 %a2)
call void @use_val(i32 %a3)
call void @use_val(i32 %a4)
call void @use_val(i32 %a5)
call void @use_val(i32 %a6)
call void @use_val(i32 %a7)
call void @use_val(i32 %a8)
ret void
}
|
