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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
; fsub -0.0, (fsub -0.0, X) ==> X
define float @fsub_-0_-0_x(float %a) {
; CHECK-LABEL: @fsub_-0_-0_x(
; CHECK-NEXT: ret float %a
;
%t1 = fsub float -0.0, %a
%ret = fsub float -0.0, %t1
ret float %ret
}
; fsub 0.0, (fsub -0.0, X) != X
define float @fsub_0_-0_x(float %a) {
; CHECK-LABEL: @fsub_0_-0_x(
; CHECK-NEXT: [[T1:%.*]] = fsub float 0.000000e+00, %a
; CHECK-NEXT: [[RET:%.*]] = fsub float -0.000000e+00, [[T1]]
; CHECK-NEXT: ret float [[RET]]
;
%t1 = fsub float 0.0, %a
%ret = fsub float -0.0, %t1
ret float %ret
}
; fsub -0.0, (fsub 0.0, X) != X
define float @fsub_-0_0_x(float %a) {
; CHECK-LABEL: @fsub_-0_0_x(
; CHECK-NEXT: [[T1:%.*]] = fsub float -0.000000e+00, %a
; CHECK-NEXT: [[RET:%.*]] = fsub float 0.000000e+00, [[T1]]
; CHECK-NEXT: ret float [[RET]]
;
%t1 = fsub float -0.0, %a
%ret = fsub float 0.0, %t1
ret float %ret
}
; fsub X, 0 ==> X
define float @fsub_x_0(float %a) {
; CHECK-LABEL: @fsub_x_0(
; CHECK-NEXT: ret float %a
;
%ret = fsub float %a, 0.0
ret float %ret
}
; fadd X, -0 ==> X
define float @fadd_x_n0(float %a) {
; CHECK-LABEL: @fadd_x_n0(
; CHECK-NEXT: ret float %a
;
%ret = fadd float %a, -0.0
ret float %ret
}
; fmul X, 1.0 ==> X
define double @fmul_X_1(double %a) {
; CHECK-LABEL: @fmul_X_1(
; CHECK-NEXT: ret double %a
;
%b = fmul double 1.000000e+00, %a
ret double %b
}
; fdiv X, 1.0 ==> X
define float @fdiv_x_1(float %a) {
; CHECK-LABEL: @fdiv_x_1(
; CHECK-NEXT: ret float %a
;
%ret = fdiv float %a, 1.0
ret float %ret
}
; We can't optimize away the fadd in this test because the input
; value to the function and subsequently to the fadd may be -0.0.
; In that one special case, the result of the fadd should be +0.0
; rather than the first parameter of the fadd.
; Fragile test warning: We need 6 sqrt calls to trigger the bug
; because the internal logic has a magic recursion limit of 6.
; This is presented without any explanation or ability to customize.
declare float @sqrtf(float)
define float @PR22688(float %x) {
; CHECK-LABEL: @PR22688(
; CHECK-NEXT: [[TMP1:%.*]] = call float @sqrtf(float %x)
; CHECK-NEXT: [[TMP2:%.*]] = call float @sqrtf(float [[TMP1]])
; CHECK-NEXT: [[TMP3:%.*]] = call float @sqrtf(float [[TMP2]])
; CHECK-NEXT: [[TMP4:%.*]] = call float @sqrtf(float [[TMP3]])
; CHECK-NEXT: [[TMP5:%.*]] = call float @sqrtf(float [[TMP4]])
; CHECK-NEXT: [[TMP6:%.*]] = call float @sqrtf(float [[TMP5]])
; CHECK-NEXT: [[TMP7:%.*]] = fadd float [[TMP6]], 0.000000e+00
; CHECK-NEXT: ret float [[TMP7]]
;
%1 = call float @sqrtf(float %x)
%2 = call float @sqrtf(float %1)
%3 = call float @sqrtf(float %2)
%4 = call float @sqrtf(float %3)
%5 = call float @sqrtf(float %4)
%6 = call float @sqrtf(float %5)
%7 = fadd float %6, 0.0
ret float %7
}
declare float @llvm.fabs.f32(float)
declare float @llvm.sqrt.f32(float)
; CHECK-LABEL: @fabs_select_positive_constants(
; CHECK: %select = select i1 %cmp, float 1.000000e+00, float 2.000000e+00
; CHECK-NEXT: ret float %select
define float @fabs_select_positive_constants(i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 1.0, float 2.0
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_constant_variable(
; CHECK: %select = select i1 %cmp, float 1.000000e+00, float %x
; CHECK-NEXT: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_constant_variable(i32 %c, float %x) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 1.0, float %x
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_neg0_pos0(
; CHECK: %select = select i1 %cmp, float -0.000000e+00, float 0.000000e+00
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
; CHECK-NEXT: ret float %fabs
define float @fabs_select_neg0_pos0(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float -0.0, float 0.0
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_neg0_neg1(
; CHECK: %select = select i1 %cmp, float -0.000000e+00, float -1.000000e+00
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_neg0_neg1(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float -0.0, float -1.0
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_nan_nan(
; CHECK: %select = select i1 %cmp, float 0x7FF8000000000000, float 0x7FF8000100000000
; CHECK-NEXT: ret float %select
define float @fabs_select_nan_nan(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 0x7FF8000000000000, float 0x7FF8000100000000
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_negnan_nan(
; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000000000000
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_negnan_nan(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000000000000
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_negnan_negnan(
; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000100000000
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_negnan_negnan(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000100000000
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_negnan_negzero(
; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float -0.000000e+00
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_negnan_negzero(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 0xFFF8000000000000, float -0.0
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_select_negnan_zero(
; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0.000000e+00
; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
define float @fabs_select_negnan_zero(float addrspace(1)* %out, i32 %c) {
%cmp = icmp eq i32 %c, 0
%select = select i1 %cmp, float 0xFFF8000000000000, float 0.0
%fabs = call float @llvm.fabs.f32(float %select)
ret float %fabs
}
; CHECK-LABEL: @fabs_sqrt
; CHECK: call float @llvm.sqrt.f32
; CHECK: call float @llvm.fabs.f32
define float @fabs_sqrt(float %a) {
; The fabs can't be eliminated because llvm.sqrt.f32 may return -0 or NaN with
; an arbitrary sign bit.
%sqrt = call float @llvm.sqrt.f32(float %a)
%fabs = call float @llvm.fabs.f32(float %sqrt)
ret float %fabs
}
; CHECK-LABEL: @fabs_sqrt_nnan
; CHECK: call nnan float @llvm.sqrt.f32
; CHECK: call float @llvm.fabs.f32
define float @fabs_sqrt_nnan(float %a) {
; The fabs can't be eliminated because the nnan sqrt may still return -0.
%sqrt = call nnan float @llvm.sqrt.f32(float %a)
%fabs = call float @llvm.fabs.f32(float %sqrt)
ret float %fabs
}
; CHECK-LABEL: @fabs_sqrt_nsz
; CHECK: call nsz float @llvm.sqrt.f32
; CHECK: call float @llvm.fabs.f32
define float @fabs_sqrt_nsz(float %a) {
; The fabs can't be eliminated because the nsz sqrt may still return NaN.
%sqrt = call nsz float @llvm.sqrt.f32(float %a)
%fabs = call float @llvm.fabs.f32(float %sqrt)
ret float %fabs
}
; CHECK-LABEL: @fabs_sqrt_nnan_nsz
; CHECK: call nnan nsz float @llvm.sqrt.f32
; CHECK-NOT: call float @llvm.fabs.f32
define float @fabs_sqrt_nnan_nsz(float %a) {
; The fabs can be eliminated because we're nsz and nnan.
%sqrt = call nnan nsz float @llvm.sqrt.f32(float %a)
%fabs = call float @llvm.fabs.f32(float %sqrt)
ret float %fabs
}
; CHECK-LABEL: @fabs_sqrt_nnan_fabs
; CHECK: call float @llvm.fabs.f32
; CHECK: call nnan float @llvm.sqrt.f32
; CHECK-NOT: call float @llvm.fabs.f32
define float @fabs_sqrt_nnan_fabs(float %a) {
; The second fabs can be eliminated because the operand to sqrt cannot be -0.
%b = call float @llvm.fabs.f32(float %a)
%sqrt = call nnan float @llvm.sqrt.f32(float %b)
%fabs = call float @llvm.fabs.f32(float %sqrt)
ret float %fabs
}
|
