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
|
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -o - %s -mtriple=x86_64-- -run-pass peephole-opt | FileCheck %s
---
name: opt_zerocmp_0
body: |
bb.0:
; CHECK-LABEL: name: opt_zerocmp_0
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[XOR32ri:%[0-9]+]]:gr32 = XOR32ri [[COPY]], i32 1234, implicit-def $eflags
; CHECK-NEXT: $al = SETCCr 5, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = XOR32ri %0, i32 1234, implicit-def $eflags
; TEST should be removed.
TEST32rr %1, %1, implicit-def $eflags
$al = SETCCr 5, implicit $eflags
...
---
name: opt_zerocmp_1
body: |
bb.0:
; CHECK-LABEL: name: opt_zerocmp_1
; CHECK: [[COPY:%[0-9]+]]:gr64 = COPY $rsi
; CHECK-NEXT: [[DEC64r:%[0-9]+]]:gr64 = DEC64r [[COPY]], implicit-def $eflags
; CHECK-NEXT: [[LEA64r:%[0-9]+]]:gr64 = LEA64r [[DEC64r]], 5, $noreg, 12, $noreg
; CHECK-NEXT: $al = SETCCr 4, implicit $eflags
%0:gr64 = COPY $rsi
%1:gr64 = DEC64r %0, implicit-def $eflags
; CMP should be removed.
CMP64ri8 %1, 0, implicit-def $eflags
%2:gr64 = LEA64r %1, 5, $noreg, 12, $noreg
$al = SETCCr 4, implicit $eflags
...
---
name: opt_multiple_blocks
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: opt_multiple_blocks
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gr64 = COPY undef $rsi
; CHECK-NEXT: [[INC64r:%[0-9]+]]:gr64 = INC64r [[COPY]], implicit-def $eflags
; CHECK-NEXT: PUSH64r undef $rcx, implicit-def $rsp, implicit $rsp
; CHECK-NEXT: $rcx = POP64r implicit-def $rsp, implicit $rsp
; CHECK-NEXT: JMP_1 %bb.1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: liveins: $eflags
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[LEA64r:%[0-9]+]]:gr64 = LEA64r [[INC64r]], 5, $noreg, 12, $noreg
; CHECK-NEXT: $al = SETCCr 4, implicit $eflags
bb.0:
%0:gr64 = COPY undef $rsi
%1:gr64 = INC64r %0, implicit-def $eflags
PUSH64r undef $rcx, implicit-def $rsp, implicit $rsp
$rcx = POP64r implicit-def $rsp, implicit $rsp
JMP_1 %bb.1
bb.1:
; TEST should be removed.
TEST64rr %1, %1, implicit-def $eflags
%2:gr64 = LEA64r %1, 5, $noreg, 12, $noreg
$al = SETCCr 4, implicit $eflags
...
---
name: opt_multiple_blocks_noopt_0
body: |
; CHECK-LABEL: name: opt_multiple_blocks_noopt_0
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gr64 = COPY undef $rsi
; CHECK-NEXT: [[INC64r:%[0-9]+]]:gr64 = INC64r [[COPY]], implicit-def $eflags
; CHECK-NEXT: JMP_1 %bb.1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: TEST64rr [[INC64r]], [[INC64r]], implicit-def $eflags
; CHECK-NEXT: [[LEA64r:%[0-9]+]]:gr64 = LEA64r [[INC64r]], 5, $noreg, 12, $noreg
; CHECK-NEXT: $al = SETCCr 4, implicit $eflags
; CHECK-NEXT: JCC_1 %bb.1, 2, implicit $eflags
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
bb.0:
%0:gr64 = COPY undef $rsi
%1:gr64 = INC64r %0, implicit-def $eflags
JMP_1 %bb.1
bb.1:
; The TEST64rr should not be removed, since there are multiple preds.
TEST64rr %1, %1, implicit-def $eflags
%2:gr64 = LEA64r %1, 5, $noreg, 12, $noreg
$al = SETCCr 4, implicit $eflags
JCC_1 %bb.1, 2, implicit $eflags
bb.2:
...
---
name: opt_multiple_blocks_noopt_1
body: |
; CHECK-LABEL: name: opt_multiple_blocks_noopt_1
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: JMP_1 %bb.1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gr64 = COPY undef $rsi
; CHECK-NEXT: TEST64rr [[COPY]], [[COPY]], implicit-def $eflags
; CHECK-NEXT: JCC_1 %bb.1, 2, implicit $eflags
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
; CHECK-NEXT: [[MOV32r0_:%[0-9]+]]:gr32 = MOV32r0 implicit-def $eflags
; CHECK-NEXT: TEST64rr [[COPY]], [[COPY]], implicit-def $eflags
; CHECK-NEXT: $al = SETCCr 4, implicit $eflags
bb.0:
JMP_1 %bb.1
bb.1:
%0:gr64 = COPY undef $rsi
TEST64rr %0, %0, implicit-def $eflags
JCC_1 %bb.1, 2, implicit $eflags
bb.2:
; We should not move MOV32r0 up into the loop (that would be correct but
; slow).
%1:gr32 = MOV32r0 implicit-def $eflags
; TEST should not be removed because of MOV32r0.
TEST64rr %0, %0, implicit-def $eflags
$al = SETCCr 4, implicit $eflags
...
---
name: opt_zerocmp_user_0
body: |
bb.0:
; CHECK-LABEL: name: opt_zerocmp_user_0
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[NEG32r:%[0-9]+]]:gr32 = NEG32r [[COPY]], implicit-def $eflags
; CHECK-NEXT: $al = SETCCr 3, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = NEG32r %0, implicit-def dead $eflags
; TEST should be removed.
TEST32rr %0, %0, implicit-def $eflags
$al = SETCCr 4, implicit $eflags
...
---
name: opt_redundant_flags_0
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_0
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: [[SUB32rr:%[0-9]+]]:gr32 = SUB32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $eax = COPY [[SUB32rr]]
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
%2:gr32 = SUB32rr %0, %1, implicit-def dead $eflags
$eax = COPY %2
; CMP should be removed.
CMP32rr %0, %1, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_1
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_1
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: [[SUB32rr:%[0-9]+]]:gr32 = SUB32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $eax = COPY [[SUB32rr]]
; CHECK-NEXT: $bl = SETCCr 6, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
%2:gr32 = SUB32rr %0, %1, implicit-def dead $eflags
$eax = COPY %2
; CMP should be removed.
CMP32rr %1, %0, implicit-def $eflags
$bl = SETCCr 3, implicit $eflags
...
---
name: opt_redundant_flags_2
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_2
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: [[SUB32rr:%[0-9]+]]:gr32 = SUB32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $eax = COPY [[SUB32rr]]
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
%2:gr32 = SUB32rr %0, %1, implicit-def $eflags
; an extra eflags reader shouldn't stop optimization.
$cl = SETCCr 2, implicit $eflags
$eax = COPY %2
CMP32rr %0, %1, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_cmp
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_cmp
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: CMP32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 7, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
CMP32rr %0, %1, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; 2nd CMP should be removed.
CMP32rr %1, %0, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_cmp_2
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_cmp_2
; CHECK: [[COPY:%[0-9]+]]:gr64 = COPY $rsi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr64 = COPY $rdi
; CHECK-NEXT: CMP64ri8 [[COPY]], 15, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr64 = COPY $rsi
%1:gr64 = COPY $rdi
CMP64ri8 %0, 15, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; 2nd CMP should be removed.
CMP64ri8 %0, 15, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_test_test
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_test_test
; CHECK: [[COPY:%[0-9]+]]:gr16 = COPY $ax
; CHECK-NEXT: TEST16rr [[COPY]], [[COPY]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr16 = COPY $ax
TEST16rr %0, %0, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; 2nd CMP should be removed.
TEST16rr %0, %0, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_sub
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_sub
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: CMP32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 7, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
CMP32rr %0, %1, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; SUB should be removed.
dead %2:gr32 = SUB32rr %1, %0, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_sub_2
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_sub_2
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: CMP32ri [[COPY]], -12345, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
CMP32ri %0, -12345, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; SUB should be removed
dead %2:gr32 = SUB32ri %0, -12345, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_sub_noopt
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_sub_noopt
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr32 = COPY $edi
; CHECK-NEXT: CMP32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: [[SUB32rr:%[0-9]+]]:gr32 = SUB32rr [[COPY]], [[COPY1]], implicit-def $eflags
; CHECK-NEXT: $rdx = COPY [[SUB32rr]]
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
%1:gr32 = COPY $edi
CMP32rr %0, %1, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; cannot optimize the SUB because the result value is used.
%2:gr32 = SUB32rr %0, %1, implicit-def $eflags
$rdx = COPY %2
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_test
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_test
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: CMP32ri8 [[COPY]], 0, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
CMP32ri8 %0, 0, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; TEST should be removed
TEST32rr %0, %0, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_test_cmp
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_test_cmp
; CHECK: [[COPY:%[0-9]+]]:gr32 = COPY $esi
; CHECK-NEXT: TEST32rr [[COPY]], [[COPY]], implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 2, implicit $eflags
; CHECK-NEXT: $bl = SETCCr 2, implicit $eflags
%0:gr32 = COPY $esi
TEST32rr %0, %0, implicit-def $eflags
$cl = SETCCr 2, implicit $eflags
; TEST should be removed
CMP32ri8 %0, 0, implicit-def $eflags
$bl = SETCCr 2, implicit $eflags
...
---
name: opt_redundant_flags_cmp_addr
stack:
- { id: 0, size: 4, alignment: 4 }
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_addr
; CHECK: [[COPY:%[0-9]+]]:gr64 = COPY $rsi
; CHECK-NEXT: CMP64ri32 [[COPY]], @opt_redundant_flags_cmp_addr + 4, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 7, implicit $eflags
; CHECK-NEXT: $cl = SETCCr 3, implicit $eflags
%0:gr64 = COPY $rsi
CMP64ri32 %0, @opt_redundant_flags_cmp_addr + 4, implicit-def $eflags
$cl = SETCCr 7, implicit $eflags
; CMP should be removed
CMP64ri32 %0, @opt_redundant_flags_cmp_addr + 4, implicit-def $eflags
$cl = SETCCr 3, implicit $eflags
...
---
name: opt_redundant_flags_cmp_addr_noopt
stack:
- { id: 0, size: 4, alignment: 4 }
body: |
bb.0:
; CHECK-LABEL: name: opt_redundant_flags_cmp_addr_noopt
; CHECK: [[COPY:%[0-9]+]]:gr64 = COPY $rsi
; CHECK-NEXT: CMP64ri32 [[COPY]], @opt_redundant_flags_cmp_addr_noopt + 24, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 7, implicit $eflags
; CHECK-NEXT: CMP64ri32 [[COPY]], 24, implicit-def $eflags
; CHECK-NEXT: $cl = SETCCr 3, implicit $eflags
%0:gr64 = COPY $rsi
CMP64ri32 %0, @opt_redundant_flags_cmp_addr_noopt + 24, implicit-def $eflags
$cl = SETCCr 7, implicit $eflags
; CMP should not be removed
CMP64ri32 %0, 24, implicit-def $eflags
$cl = SETCCr 3, implicit $eflags
...
|
