aboutsummaryrefslogtreecommitdiffstats
path: root/test/CodeGen/X86/sibcall.ll
blob: 4b27f2edb759bdc2dcbcc2b3069167d9a478873b (plain)
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
; RUN: llc < %s -march=x86    -mattr=+sse2 -asm-verbose=false | FileCheck %s -check-prefix=32
; RUN: llc < %s -march=x86-64 -mattr=+sse2 -asm-verbose=false | FileCheck %s -check-prefix=64

define void @t1(i32 %x) nounwind ssp {
entry:
; 32: t1:
; 32: jmp {{_?}}foo

; 64: t1:
; 64: jmp {{_?}}foo
  tail call void @foo() nounwind
  ret void
}

declare void @foo()

define void @t2() nounwind ssp {
entry:
; 32: t2:
; 32: jmp {{_?}}foo2

; 64: t2:
; 64: jmp {{_?}}foo2
  %0 = tail call i32 @foo2() nounwind
  ret void
}

declare i32 @foo2()

define void @t3() nounwind ssp {
entry:
; 32: t3:
; 32: jmp {{_?}}foo3

; 64: t3:
; 64: jmp {{_?}}foo3
  %0 = tail call i32 @foo3() nounwind
  ret void
}

declare i32 @foo3()

define void @t4(void (i32)* nocapture %x) nounwind ssp {
entry:
; 32: t4:
; 32: call *
; FIXME: gcc can generate a tailcall for this. But it's tricky.

; 64: t4:
; 64-NOT: call
; 64: jmpq *
  tail call void %x(i32 0) nounwind
  ret void
}

define void @t5(void ()* nocapture %x) nounwind ssp {
entry:
; 32: t5:
; 32-NOT: call
; 32: jmpl *4(%esp)

; 64: t5:
; 64-NOT: call
; 64: jmpq *%rdi
  tail call void %x() nounwind
  ret void
}

define i32 @t6(i32 %x) nounwind ssp {
entry:
; 32: t6:
; 32: call {{_?}}t6
; 32: jmp {{_?}}bar

; 64: t6:
; 64: jmp {{_?}}t6
; 64: jmp {{_?}}bar
  %0 = icmp slt i32 %x, 10
  br i1 %0, label %bb, label %bb1

bb:
  %1 = add nsw i32 %x, -1
  %2 = tail call i32 @t6(i32 %1) nounwind ssp
  ret i32 %2

bb1:
  %3 = tail call i32 @bar(i32 %x) nounwind
  ret i32 %3
}

declare i32 @bar(i32)

define i32 @t7(i32 %a, i32 %b, i32 %c) nounwind ssp {
entry:
; 32: t7:
; 32: jmp {{_?}}bar2

; 64: t7:
; 64: jmp {{_?}}bar2
  %0 = tail call i32 @bar2(i32 %a, i32 %b, i32 %c) nounwind
  ret i32 %0
}

declare i32 @bar2(i32, i32, i32)

define signext i16 @t8() nounwind ssp {
entry:
; 32: t8:
; 32: call {{_?}}bar3

; 64: t8:
; 64: callq {{_?}}bar3
  %0 = tail call signext i16 @bar3() nounwind      ; <i16> [#uses=1]
  ret i16 %0
}

declare signext i16 @bar3()

define signext i16 @t9(i32 (i32)* nocapture %x) nounwind ssp {
entry:
; 32: t9:
; 32: call *

; 64: t9:
; 64: callq *
  %0 = bitcast i32 (i32)* %x to i16 (i32)*
  %1 = tail call signext i16 %0(i32 0) nounwind
  ret i16 %1
}

define void @t10() nounwind ssp {
entry:
; 32: t10:
; 32: call

; 64: t10:
; 64: callq
  %0 = tail call i32 @foo4() noreturn nounwind
  unreachable
}

declare i32 @foo4()

define i32 @t11(i32 %x, i32 %y, i32 %z.0, i32 %z.1, i32 %z.2) nounwind ssp {
; In 32-bit mode, it's emitting a bunch of dead loads that are not being
; eliminated currently.

; 32: t11:
; 32-NOT: subl ${{[0-9]+}}, %esp
; 32: jne
; 32-NOT: movl
; 32-NOT: addl ${{[0-9]+}}, %esp
; 32: jmp {{_?}}foo5

; 64: t11:
; 64-NOT: subq ${{[0-9]+}}, %esp
; 64-NOT: addq ${{[0-9]+}}, %esp
; 64: jmp {{_?}}foo5
entry:
  %0 = icmp eq i32 %x, 0
  br i1 %0, label %bb6, label %bb

bb:
  %1 = tail call i32 @foo5(i32 %x, i32 %y, i32 %z.0, i32 %z.1, i32 %z.2) nounwind
  ret i32 %1

bb6:
  ret i32 0
}

declare i32 @foo5(i32, i32, i32, i32, i32)

%struct.t = type { i32, i32, i32, i32, i32 }

define i32 @t12(i32 %x, i32 %y, %struct.t* byval align 4 %z) nounwind ssp {
; 32: t12:
; 32-NOT: subl ${{[0-9]+}}, %esp
; 32-NOT: addl ${{[0-9]+}}, %esp
; 32: jmp {{_?}}foo6

; 64: t12:
; 64-NOT: subq ${{[0-9]+}}, %esp
; 64-NOT: addq ${{[0-9]+}}, %esp
; 64: jmp {{_?}}foo6
entry:
  %0 = icmp eq i32 %x, 0
  br i1 %0, label %bb2, label %bb

bb:
  %1 = tail call i32 @foo6(i32 %x, i32 %y, %struct.t* byval align 4 %z) nounwind
  ret i32 %1

bb2:
  ret i32 0
}

declare i32 @foo6(i32, i32, %struct.t* byval align 4)

; rdar://r7717598
%struct.ns = type { i32, i32 }
%struct.cp = type { float, float }

define %struct.ns* @t13(%struct.cp* %yy) nounwind ssp {
; 32: t13:
; 32-NOT: jmp
; 32: call
; 32: ret

; 64: t13:
; 64-NOT: jmp
; 64: call
; 64: ret
entry:
  %0 = tail call fastcc %struct.ns* @foo7(%struct.cp* byval align 4 %yy, i8 signext 0) nounwind
  ret %struct.ns* %0
}

; rdar://6195379
; llvm can't do sibcall for this in 32-bit mode (yet).
declare fastcc %struct.ns* @foo7(%struct.cp* byval align 4, i8 signext) nounwind ssp

%struct.__block_descriptor = type { i64, i64 }
%struct.__block_descriptor_withcopydispose = type { i64, i64, i8*, i8* }
%struct.__block_literal_1 = type { i8*, i32, i32, i8*, %struct.__block_descriptor* }
%struct.__block_literal_2 = type { i8*, i32, i32, i8*, %struct.__block_descriptor_withcopydispose*, void ()* }

define void @t14(%struct.__block_literal_2* nocapture %.block_descriptor) nounwind ssp {
entry:
; 64: t14:
; 64: movq 32(%rdi)
; 64-NOT: movq 16(%rdi)
; 64: jmpq *16(%rdi)
  %0 = getelementptr inbounds %struct.__block_literal_2* %.block_descriptor, i64 0, i32 5 ; <void ()**> [#uses=1]
  %1 = load void ()** %0, align 8                 ; <void ()*> [#uses=2]
  %2 = bitcast void ()* %1 to %struct.__block_literal_1* ; <%struct.__block_literal_1*> [#uses=1]
  %3 = getelementptr inbounds %struct.__block_literal_1* %2, i64 0, i32 3 ; <i8**> [#uses=1]
  %4 = load i8** %3, align 8                      ; <i8*> [#uses=1]
  %5 = bitcast i8* %4 to void (i8*)*              ; <void (i8*)*> [#uses=1]
  %6 = bitcast void ()* %1 to i8*                 ; <i8*> [#uses=1]
  tail call void %5(i8* %6) nounwind
  ret void
}

; rdar://7726868
%struct.foo = type { [4 x i32] }

define void @t15(%struct.foo* noalias sret %agg.result) nounwind  {
; 32: t15:
; 32: call {{_?}}f
; 32: ret $4

; 64: t15:
; 64: callq {{_?}}f
; 64: ret
  tail call fastcc void @f(%struct.foo* noalias sret %agg.result) nounwind
  ret void
}

declare void @f(%struct.foo* noalias sret) nounwind

define void @t16() nounwind ssp {
entry:
; 32: t16:
; 32: call {{_?}}bar4
; 32: fstp

; 64: t16:
; 64: jmp {{_?}}bar4
  %0 = tail call double @bar4() nounwind
  ret void
}

declare double @bar4()

; rdar://6283267
define void @t17() nounwind ssp {
entry:
; 32: t17:
; 32: jmp {{_?}}bar5

; 64: t17:
; 64: xorb %al, %al
; 64: jmp {{_?}}bar5
  tail call void (...)* @bar5() nounwind
  ret void
}

declare void @bar5(...)

; rdar://7774847
define void @t18() nounwind ssp {
entry:
; 32: t18:
; 32: call {{_?}}bar6
; 32: fstp %st(0)

; 64: t18:
; 64: xorb %al, %al
; 64: jmp {{_?}}bar6
  %0 = tail call double (...)* @bar6() nounwind
  ret void
}

declare double @bar6(...)

define void @t19() alignstack(32) nounwind {
entry:
; CHECK: t19:
; CHECK: andl $-32
; CHECK: call {{_?}}foo
  tail call void @foo() nounwind
  ret void
}

declare void @foo()

; If caller / callee calling convention mismatch then check if the return
; values are returned in the same registers.
; rdar://7874780

define double @t20(double %x) nounwind {
entry:
; 32: t20:
; 32: call {{_?}}foo20
; 32: fldl (%esp)

; 64: t20:
; 64: jmp {{_?}}foo20
  %0 = tail call fastcc double @foo20(double %x) nounwind
  ret double %0
}

declare fastcc double @foo20(double) nounwind