forked from llvm/llvm-project
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathreg-stackify.ll
493 lines (432 loc) · 17.1 KB
/
reg-stackify.ll
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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -disable-wasm-explicit-locals -verify-machineinstrs | FileCheck %s
; Test the register stackifier pass.
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
; No because of pointer aliasing.
; CHECK-LABEL: no0:
; CHECK: return $1{{$}}
define i32 @no0(i32* %p, i32* %q) {
%t = load i32, i32* %q
store i32 0, i32* %p
ret i32 %t
}
; No because of side effects.
; CHECK-LABEL: no1:
; CHECK: return $1{{$}}
define i32 @no1(i32* %p, i32* dereferenceable(4) %q) {
%t = load volatile i32, i32* %q, !invariant.load !0
store volatile i32 0, i32* %p
ret i32 %t
}
; Yes because of invariant load and no side effects.
; CHECK-LABEL: yes0:
; CHECK: return $pop{{[0-9]+}}{{$}}
define i32 @yes0(i32* %p, i32* dereferenceable(4) %q) {
%t = load i32, i32* %q, !invariant.load !0
store i32 0, i32* %p
ret i32 %t
}
; Yes because of no intervening side effects.
; CHECK-LABEL: yes1:
; CHECK: return $pop0{{$}}
define i32 @yes1(i32* %q) {
%t = load volatile i32, i32* %q
ret i32 %t
}
; Yes because undefined behavior can be sunk past a store.
; CHECK-LABEL: sink_trap:
; CHECK: return $pop{{[0-9]+}}{{$}}
define i32 @sink_trap(i32 %x, i32 %y, i32* %p) {
%t = sdiv i32 %x, %y
store volatile i32 0, i32* %p
ret i32 %t
}
; Yes because the call is readnone.
; CHECK-LABEL: sink_readnone_call:
; CHECK: return $pop0{{$}}
declare i32 @readnone_callee() readnone nounwind
define i32 @sink_readnone_call(i32 %x, i32 %y, i32* %p) {
%t = call i32 @readnone_callee()
store volatile i32 0, i32* %p
ret i32 %t
}
; No because the call is readonly and there's an intervening store.
; CHECK-LABEL: no_sink_readonly_call:
; CHECK: return ${{[0-9]+}}{{$}}
declare i32 @readonly_callee() readonly nounwind
define i32 @no_sink_readonly_call(i32 %x, i32 %y, i32* %p) {
%t = call i32 @readonly_callee()
store i32 0, i32* %p
ret i32 %t
}
; Don't schedule stack uses into the stack. To reduce register pressure, the
; scheduler might be tempted to move the definition of $2 down. However, this
; would risk getting incorrect liveness if the instructions are later
; rearranged to make the stack contiguous.
; CHECK-LABEL: stack_uses:
; CHECK: .param i32, i32, i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: block {{$}}
; CHECK-NEXT: i32.const $push[[L13:[0-9]+]]=, 1{{$}}
; CHECK-NEXT: i32.lt_s $push[[L0:[0-9]+]]=, $0, $pop[[L13]]{{$}}
; CHECK-NEXT: i32.const $push[[L1:[0-9]+]]=, 2{{$}}
; CHECK-NEXT: i32.lt_s $push[[L2:[0-9]+]]=, $1, $pop[[L1]]{{$}}
; CHECK-NEXT: i32.xor $push[[L5:[0-9]+]]=, $pop[[L0]], $pop[[L2]]{{$}}
; CHECK-NEXT: i32.const $push[[L12:[0-9]+]]=, 1{{$}}
; CHECK-NEXT: i32.lt_s $push[[L3:[0-9]+]]=, $2, $pop[[L12]]{{$}}
; CHECK-NEXT: i32.const $push[[L11:[0-9]+]]=, 2{{$}}
; CHECK-NEXT: i32.lt_s $push[[L4:[0-9]+]]=, $3, $pop[[L11]]{{$}}
; CHECK-NEXT: i32.xor $push[[L6:[0-9]+]]=, $pop[[L3]], $pop[[L4]]{{$}}
; CHECK-NEXT: i32.xor $push[[L7:[0-9]+]]=, $pop[[L5]], $pop[[L6]]{{$}}
; CHECK-NEXT: i32.const $push10=, 1{{$}}
; CHECK-NEXT: i32.ne $push8=, $pop7, $pop10{{$}}
; CHECK-NEXT: br_if 0, $pop8{{$}}
; CHECK-NEXT: i32.const $push9=, 0{{$}}
; CHECK-NEXT: return $pop9{{$}}
; CHECK-NEXT: .LBB7_2:
; CHECK-NEXT: end_block{{$}}
; CHECK-NEXT: i32.const $push14=, 1{{$}}
; CHECK-NEXT: return $pop14{{$}}
define i32 @stack_uses(i32 %x, i32 %y, i32 %z, i32 %w) {
entry:
%c = icmp sle i32 %x, 0
%d = icmp sle i32 %y, 1
%e = icmp sle i32 %z, 0
%f = icmp sle i32 %w, 1
%g = xor i1 %c, %d
%h = xor i1 %e, %f
%i = xor i1 %g, %h
br i1 %i, label %true, label %false
true:
ret i32 0
false:
ret i32 1
}
; Test an interesting case where the load has multiple uses and cannot
; be trivially stackified. However, it can be stackified with a tee_local.
; CHECK-LABEL: multiple_uses:
; CHECK: .param i32, i32, i32{{$}}
; CHECK-NEXT: block {{$}}
; CHECK-NEXT: i32.load $push[[NUM0:[0-9]+]]=, 0($2){{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $3=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: i32.ge_u $push[[NUM2:[0-9]+]]=, $pop[[NUM1]], $1{{$}}
; CHECK-NEXT: br_if 0, $pop[[NUM2]]{{$}}
; CHECK-NEXT: i32.lt_u $push[[NUM3:[0-9]+]]=, $3, $0{{$}}
; CHECK-NEXT: br_if 0, $pop[[NUM3]]{{$}}
; CHECK-NEXT: i32.store 0($2), $3{{$}}
; CHECK-NEXT: .LBB8_3:
; CHECK-NEXT: end_block{{$}}
; CHECK-NEXT: return{{$}}
define void @multiple_uses(i32* %arg0, i32* %arg1, i32* %arg2) nounwind {
bb:
br label %loop
loop:
%tmp7 = load i32, i32* %arg2
%tmp8 = inttoptr i32 %tmp7 to i32*
%tmp9 = icmp uge i32* %tmp8, %arg1
%tmp10 = icmp ult i32* %tmp8, %arg0
%tmp11 = or i1 %tmp9, %tmp10
br i1 %tmp11, label %back, label %then
then:
store i32 %tmp7, i32* %arg2
br label %back
back:
br i1 undef, label %return, label %loop
return:
ret void
}
; Don't stackify stores effects across other instructions with side effects.
; CHECK: side_effects:
; CHECK: store
; CHECK-NEXT: call
; CHECK: store
; CHECK-NEXT: call
declare void @evoke_side_effects()
define hidden void @stackify_store_across_side_effects(double* nocapture %d) {
entry:
store double 2.0, double* %d
call void @evoke_side_effects()
store double 2.0, double* %d
call void @evoke_side_effects()
ret void
}
; Div instructions have side effects and can't be reordered, but this entire
; function should still be able to be stackified because it's already in
; tree order.
; CHECK-LABEL: div_tree:
; CHECK: .param i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: i32.div_s $push[[L0:[0-9]+]]=, $0, $1{{$}}
; CHECK-NEXT: i32.div_s $push[[L1:[0-9]+]]=, $2, $3{{$}}
; CHECK-NEXT: i32.div_s $push[[L2:[0-9]+]]=, $pop[[L0]], $pop[[L1]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L3:[0-9]+]]=, $4, $5{{$}}
; CHECK-NEXT: i32.div_s $push[[L4:[0-9]+]]=, $6, $7{{$}}
; CHECK-NEXT: i32.div_s $push[[L5:[0-9]+]]=, $pop[[L3]], $pop[[L4]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L6:[0-9]+]]=, $pop[[L2]], $pop[[L5]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L7:[0-9]+]]=, $8, $9{{$}}
; CHECK-NEXT: i32.div_s $push[[L8:[0-9]+]]=, $10, $11{{$}}
; CHECK-NEXT: i32.div_s $push[[L9:[0-9]+]]=, $pop[[L7]], $pop[[L8]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L10:[0-9]+]]=, $12, $13{{$}}
; CHECK-NEXT: i32.div_s $push[[L11:[0-9]+]]=, $14, $15{{$}}
; CHECK-NEXT: i32.div_s $push[[L12:[0-9]+]]=, $pop[[L10]], $pop[[L11]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L13:[0-9]+]]=, $pop[[L9]], $pop[[L12]]{{$}}
; CHECK-NEXT: i32.div_s $push[[L14:[0-9]+]]=, $pop[[L6]], $pop[[L13]]{{$}}
; CHECK-NEXT: return $pop[[L14]]{{$}}
define i32 @div_tree(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n, i32 %o, i32 %p) {
entry:
%div = sdiv i32 %a, %b
%div1 = sdiv i32 %c, %d
%div2 = sdiv i32 %div, %div1
%div3 = sdiv i32 %e, %f
%div4 = sdiv i32 %g, %h
%div5 = sdiv i32 %div3, %div4
%div6 = sdiv i32 %div2, %div5
%div7 = sdiv i32 %i, %j
%div8 = sdiv i32 %k, %l
%div9 = sdiv i32 %div7, %div8
%div10 = sdiv i32 %m, %n
%div11 = sdiv i32 %o, %p
%div12 = sdiv i32 %div10, %div11
%div13 = sdiv i32 %div9, %div12
%div14 = sdiv i32 %div6, %div13
ret i32 %div14
}
; A simple multiple-use case.
; CHECK-LABEL: simple_multiple_use:
; CHECK: .param i32, i32{{$}}
; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: call use_a@FUNCTION, $pop[[NUM1]]{{$}}
; CHECK-NEXT: call use_b@FUNCTION, $[[NUM2]]{{$}}
; CHECK-NEXT: return{{$}}
declare void @use_a(i32)
declare void @use_b(i32)
define void @simple_multiple_use(i32 %x, i32 %y) {
%mul = mul i32 %y, %x
call void @use_a(i32 %mul)
call void @use_b(i32 %mul)
ret void
}
; Multiple uses of the same value in one instruction.
; CHECK-LABEL: multiple_uses_in_same_insn:
; CHECK: .param i32, i32{{$}}
; CHECK-NEXT: i32.mul $push[[NUM0:[0-9]+]]=, $1, $0{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: call use_2@FUNCTION, $pop[[NUM1]], $[[NUM2]]{{$}}
; CHECK-NEXT: return{{$}}
declare void @use_2(i32, i32)
define void @multiple_uses_in_same_insn(i32 %x, i32 %y) {
%mul = mul i32 %y, %x
call void @use_2(i32 %mul, i32 %mul)
ret void
}
; Commute operands to achieve better stackifying.
; CHECK-LABEL: commute:
; CHECK-NOT: param
; CHECK: .result i32{{$}}
; CHECK-NEXT: i32.call $push0=, red@FUNCTION{{$}}
; CHECK-NEXT: i32.call $push1=, green@FUNCTION{{$}}
; CHECK-NEXT: i32.add $push2=, $pop0, $pop1{{$}}
; CHECK-NEXT: i32.call $push3=, blue@FUNCTION{{$}}
; CHECK-NEXT: i32.add $push4=, $pop2, $pop3{{$}}
; CHECK-NEXT: return $pop4{{$}}
declare i32 @red()
declare i32 @green()
declare i32 @blue()
define i32 @commute() {
%call = call i32 @red()
%call1 = call i32 @green()
%add = add i32 %call1, %call
%call2 = call i32 @blue()
%add3 = add i32 %add, %call2
ret i32 %add3
}
; Don't stackify a register when it would move a the def of the register past
; an implicit get_local for the register.
; CHECK-LABEL: no_stackify_past_use:
; CHECK: i32.call $1=, callee@FUNCTION, $0
; CHECK-NEXT: i32.const $push0=, 1
; CHECK-NEXT: i32.add $push1=, $0, $pop0
; CHECK-NEXT: i32.call $push2=, callee@FUNCTION, $pop1
; CHECK-NEXT: i32.sub $push3=, $pop2, $1
; CHECK-NEXT: i32.div_s $push4=, $pop3, $1
; CHECK-NEXT: return $pop4
declare i32 @callee(i32)
define i32 @no_stackify_past_use(i32 %arg) {
%tmp1 = call i32 @callee(i32 %arg)
%tmp2 = add i32 %arg, 1
%tmp3 = call i32 @callee(i32 %tmp2)
%tmp5 = sub i32 %tmp3, %tmp1
%tmp6 = sdiv i32 %tmp5, %tmp1
ret i32 %tmp6
}
; This is the same as no_stackify_past_use, except using a commutative operator,
; so we can reorder the operands and stackify.
; CHECK-LABEL: commute_to_fix_ordering:
; CHECK: i32.call $push[[L0:.+]]=, callee@FUNCTION, $0
; CHECK: tee_local $push[[L1:.+]]=, $1=, $pop[[L0]]
; CHECK: i32.const $push0=, 1
; CHECK: i32.add $push1=, $0, $pop0
; CHECK: i32.call $push2=, callee@FUNCTION, $pop1
; CHECK: i32.add $push3=, $1, $pop2
; CHECK: i32.mul $push4=, $pop[[L1]], $pop3
; CHECK: return $pop4
define i32 @commute_to_fix_ordering(i32 %arg) {
%tmp1 = call i32 @callee(i32 %arg)
%tmp2 = add i32 %arg, 1
%tmp3 = call i32 @callee(i32 %tmp2)
%tmp5 = add i32 %tmp3, %tmp1
%tmp6 = mul i32 %tmp5, %tmp1
ret i32 %tmp6
}
; Stackify individual defs of virtual registers with multiple defs.
; CHECK-LABEL: multiple_defs:
; CHECK: f64.add $push[[NUM0:[0-9]+]]=, ${{[0-9]+}}, $pop{{[0-9]+}}{{$}}
; CHECK-NEXT: tee_local $push[[NUM1:[0-9]+]]=, $[[NUM2:[0-9]+]]=, $pop[[NUM0]]{{$}}
; CHECK-NEXT: f64.select $push{{[0-9]+}}=, $pop{{[0-9]+}}, $pop[[NUM1]], ${{[0-9]+}}{{$}}
; CHECK: $[[NUM2]]=,
define void @multiple_defs(i32 %arg, i32 %arg1, i1 %arg2, i1 %arg3, i1 %arg4) {
bb:
br label %bb5
bb5: ; preds = %bb21, %bb
%tmp = phi double [ 0.000000e+00, %bb ], [ %tmp22, %bb21 ]
%tmp6 = phi double [ 0.000000e+00, %bb ], [ %tmp23, %bb21 ]
%tmp7 = fcmp olt double %tmp6, 2.323450e+01
br i1 %tmp7, label %bb8, label %bb21
bb8: ; preds = %bb17, %bb5
%tmp9 = phi double [ %tmp19, %bb17 ], [ %tmp, %bb5 ]
%tmp10 = fadd double %tmp6, -1.000000e+00
%tmp11 = select i1 %arg2, double -1.135357e+04, double %tmp10
%tmp12 = fadd double %tmp11, %tmp9
br i1 %arg3, label %bb17, label %bb13
bb13: ; preds = %bb8
%tmp14 = or i32 %arg1, 2
%tmp15 = icmp eq i32 %tmp14, 14
%tmp16 = select i1 %tmp15, double -1.135357e+04, double 0xBFCE147AE147B000
br label %bb17
bb17: ; preds = %bb13, %bb8
%tmp18 = phi double [ %tmp16, %bb13 ], [ %tmp10, %bb8 ]
%tmp19 = fadd double %tmp18, %tmp12
%tmp20 = fcmp olt double %tmp6, 2.323450e+01
br i1 %tmp20, label %bb8, label %bb21
bb21: ; preds = %bb17, %bb5
%tmp22 = phi double [ %tmp, %bb5 ], [ %tmp9, %bb17 ]
%tmp23 = fadd double %tmp6, 1.000000e+00
br i1 %arg4, label %exit, label %bb5
exit:
ret void
}
; Don't move calls past loads
; CHECK-LABEL: no_stackify_call_past_load:
; CHECK: i32.call $0=, red
; CHECK: i32.const $push0=, 0
; CHECK: i32.load $1=, count($pop0)
@count = hidden global i32 0, align 4
define i32 @no_stackify_call_past_load() {
%a = call i32 @red()
%b = load i32, i32* @count, align 4
call i32 @callee(i32 %a)
ret i32 %b
; use of a
}
; Don't move stores past loads if there may be aliasing
; CHECK-LABEL: no_stackify_store_past_load
; CHECK: i32.store 0($1), $0
; CHECK: i32.load {{.*}}, 0($2)
; CHECK: i32.call {{.*}}, callee@FUNCTION, $0{{$}}
define i32 @no_stackify_store_past_load(i32 %a, i32* %p1, i32* %p2) {
store i32 %a, i32* %p1
%b = load i32, i32* %p2, align 4
call i32 @callee(i32 %a)
ret i32 %b
}
; Can still stackify past invariant loads.
; CHECK-LABEL: store_past_invar_load
; CHECK: i32.store 0($1), $0
; CHECK: i32.call {{.*}}, callee@FUNCTION, $0
; CHECK: i32.load $push{{.*}}, 0($2)
; CHECK: return $pop
define i32 @store_past_invar_load(i32 %a, i32* %p1, i32* dereferenceable(4) %p2) {
store i32 %a, i32* %p1
%b = load i32, i32* %p2, !invariant.load !0
call i32 @callee(i32 %a)
ret i32 %b
}
; CHECK-LABEL: ignore_dbg_value:
; CHECK-NEXT: .Lfunc_begin
; CHECK-NEXT: unreachable
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
define void @ignore_dbg_value() {
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !7, metadata !9), !dbg !10
unreachable
}
; Don't stackify an expression that might use the stack into a return, since we
; might insert a prologue before the return.
; CHECK-LABEL: no_stackify_past_epilogue:
; CHECK: return ${{[0-9]+}}{{$}}
declare i32 @use_memory(i32*)
define i32 @no_stackify_past_epilogue() {
%x = alloca i32
%call = call i32 @use_memory(i32* %x)
ret i32 %call
}
; Stackify a loop induction variable into a loop comparison.
; CHECK-LABEL: stackify_indvar:
; CHECK: i32.const $push[[L5:.+]]=, 1{{$}}
; CHECK-NEXT: i32.add $push[[L4:.+]]=, $[[R0:.+]], $pop[[L5]]{{$}}
; CHECK-NEXT: tee_local $push[[L3:.+]]=, $[[R0]]=, $pop[[L4]]{{$}}
; CHECK-NEXT: i32.ne $push[[L2:.+]]=, $0, $pop[[L3]]{{$}}
define void @stackify_indvar(i32 %tmp, i32* %v) #0 {
bb:
br label %bb3
bb3: ; preds = %bb3, %bb2
%tmp4 = phi i32 [ %tmp7, %bb3 ], [ 0, %bb ]
%tmp5 = load volatile i32, i32* %v, align 4
%tmp6 = add nsw i32 %tmp5, %tmp4
store volatile i32 %tmp6, i32* %v, align 4
%tmp7 = add nuw nsw i32 %tmp4, 1
%tmp8 = icmp eq i32 %tmp7, %tmp
br i1 %tmp8, label %bb10, label %bb3
bb10: ; preds = %bb9, %bb
ret void
}
; Don't stackify a call past a __stack_pointer store.
; CHECK-LABEL: stackpointer_dependency:
; CHECK: call {{.+}}, stackpointer_callee@FUNCTION,
; CHECK-NEXT: set_global __stack_pointer,
declare i32 @stackpointer_callee(i8* readnone, i8* readnone)
declare i8* @llvm.frameaddress(i32)
define i32 @stackpointer_dependency(i8* readnone) {
%2 = tail call i8* @llvm.frameaddress(i32 0)
%3 = tail call i32 @stackpointer_callee(i8* %0, i8* %2)
ret i32 %3
}
; Stackify a call_indirect with respect to its ordering
; CHECK-LABEL: call_indirect_stackify:
; CHECK: i32.load $push[[L4:.+]]=, 0($0)
; CHECK-NEXT: tee_local $push[[L3:.+]]=, $0=, $pop[[L4]]
; CHECK-NEXT: i32.load $push[[L0:.+]]=, 0($0)
; CHECK-NEXT: i32.load $push[[L1:.+]]=, 0($pop[[L0]])
; CHECK-NEXT: i32.call_indirect $push{{.+}}=, $pop[[L3]], $1, $pop[[L1]]
%class.call_indirect = type { i32 (...)** }
define i32 @call_indirect_stackify(%class.call_indirect** %objptr, i32 %arg) {
%obj = load %class.call_indirect*, %class.call_indirect** %objptr
%addr = bitcast %class.call_indirect* %obj to i32(%class.call_indirect*, i32)***
%vtable = load i32(%class.call_indirect*, i32)**, i32(%class.call_indirect*, i32)*** %addr
%vfn = getelementptr inbounds i32(%class.call_indirect*, i32)*, i32(%class.call_indirect*, i32)** %vtable, i32 0
%f = load i32(%class.call_indirect*, i32)*, i32(%class.call_indirect*, i32)** %vfn
%ret = call i32 %f(%class.call_indirect* %obj, i32 %arg)
ret i32 %ret
}
!llvm.module.flags = !{!0}
!llvm.dbg.cu = !{!1}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 3.9.0 (trunk 266005) (llvm/trunk 266105)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3)
!2 = !DIFile(filename: "test.c", directory: "/")
!3 = !{}
!5 = distinct !DISubprogram(name: "test", scope: !2, file: !2, line: 10, type: !6, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !1, variables: !3)
!6 = !DISubroutineType(types: !3)
!7 = !DILocalVariable(name: "nzcnt", scope: !5, file: !2, line: 15, type: !8)
!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIExpression()
!10 = !DILocation(line: 15, column: 6, scope: !5)