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
|
; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s --check-prefix PTX
; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix PTX
; RUN: opt -mtriple=nvptx-- < %s -S -nvptx-infer-addrspace | FileCheck %s --check-prefix IR
; RUN: opt -mtriple=nvptx64-- < %s -S -nvptx-infer-addrspace | FileCheck %s --check-prefix IR
@array = internal addrspace(3) global [10 x float] zeroinitializer, align 4
@scalar = internal addrspace(3) global float 0.000000e+00, align 4
@generic_scalar = internal global float 0.000000e+00, align 4
define float @ld_from_shared() {
%1 = addrspacecast float* @generic_scalar to float addrspace(3)*
%2 = load float, float addrspace(3)* %1
ret float %2
}
; Verifies nvptx-favor-non-generic correctly optimizes generic address space
; usage to non-generic address space usage for the patterns we claim to handle:
; 1. load cast
; 2. store cast
; 3. load gep cast
; 4. store gep cast
; gep and cast can be an instruction or a constant expression. This function
; tries all possible combinations.
define void @ld_st_shared_f32(i32 %i, float %v) {
; IR-LABEL: @ld_st_shared_f32
; IR-NOT: addrspacecast
; PTX-LABEL: ld_st_shared_f32(
; load cast
%1 = load float, float* addrspacecast (float addrspace(3)* @scalar to float*), align 4
call void @use(float %1)
; PTX: ld.shared.f32 %f{{[0-9]+}}, [scalar];
; store cast
store float %v, float* addrspacecast (float addrspace(3)* @scalar to float*), align 4
; PTX: st.shared.f32 [scalar], %f{{[0-9]+}};
; use syncthreads to disable optimizations across components
call void @llvm.nvvm.barrier0()
; PTX: bar.sync 0;
; cast; load
%2 = addrspacecast float addrspace(3)* @scalar to float*
%3 = load float, float* %2, align 4
call void @use(float %3)
; PTX: ld.shared.f32 %f{{[0-9]+}}, [scalar];
; cast; store
store float %v, float* %2, align 4
; PTX: st.shared.f32 [scalar], %f{{[0-9]+}};
call void @llvm.nvvm.barrier0()
; PTX: bar.sync 0;
; load gep cast
%4 = load float, float* getelementptr inbounds ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5), align 4
call void @use(float %4)
; PTX: ld.shared.f32 %f{{[0-9]+}}, [array+20];
; store gep cast
store float %v, float* getelementptr inbounds ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5), align 4
; PTX: st.shared.f32 [array+20], %f{{[0-9]+}};
call void @llvm.nvvm.barrier0()
; PTX: bar.sync 0;
; gep cast; load
%5 = getelementptr inbounds [10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5
%6 = load float, float* %5, align 4
call void @use(float %6)
; PTX: ld.shared.f32 %f{{[0-9]+}}, [array+20];
; gep cast; store
store float %v, float* %5, align 4
; PTX: st.shared.f32 [array+20], %f{{[0-9]+}};
call void @llvm.nvvm.barrier0()
; PTX: bar.sync 0;
; cast; gep; load
%7 = addrspacecast [10 x float] addrspace(3)* @array to [10 x float]*
%8 = getelementptr inbounds [10 x float], [10 x float]* %7, i32 0, i32 %i
%9 = load float, float* %8, align 4
call void @use(float %9)
; PTX: ld.shared.f32 %f{{[0-9]+}}, [%{{(r|rl|rd)[0-9]+}}];
; cast; gep; store
store float %v, float* %8, align 4
; PTX: st.shared.f32 [%{{(r|rl|rd)[0-9]+}}], %f{{[0-9]+}};
call void @llvm.nvvm.barrier0()
; PTX: bar.sync 0;
ret void
}
; When hoisting an addrspacecast between different pointer types, replace the
; addrspacecast with a bitcast.
define i32 @ld_int_from_float() {
; IR-LABEL: @ld_int_from_float
; IR: load i32, i32 addrspace(3)* bitcast (float addrspace(3)* @scalar to i32 addrspace(3)*)
; PTX-LABEL: ld_int_from_float(
; PTX: ld.shared.u{{(32|64)}}
%1 = load i32, i32* addrspacecast(float addrspace(3)* @scalar to i32*), align 4
ret i32 %1
}
define i32 @ld_int_from_global_float(float addrspace(1)* %input, i32 %i, i32 %j) {
; IR-LABEL: @ld_int_from_global_float(
; PTX-LABEL: ld_int_from_global_float(
%1 = addrspacecast float addrspace(1)* %input to float*
%2 = getelementptr float, float* %1, i32 %i
; IR-NEXT: getelementptr float, float addrspace(1)* %input, i32 %i
%3 = getelementptr float, float* %2, i32 %j
; IR-NEXT: getelementptr float, float addrspace(1)* {{%[^,]+}}, i32 %j
%4 = bitcast float* %3 to i32*
; IR-NEXT: bitcast float addrspace(1)* {{%[^ ]+}} to i32 addrspace(1)*
%5 = load i32, i32* %4
; IR-NEXT: load i32, i32 addrspace(1)* {{%.+}}
; PTX-LABEL: ld.global
ret i32 %5
}
define void @nested_const_expr() {
; PTX-LABEL: nested_const_expr(
; store 1 to bitcast(gep(addrspacecast(array), 0, 1))
store i32 1, i32* bitcast (float* getelementptr ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i64 0, i64 1) to i32*), align 4
; PTX: mov.u32 %r1, 1;
; PTX-NEXT: st.shared.u32 [array+4], %r1;
ret void
}
define void @rauw(float addrspace(1)* %input) {
%generic_input = addrspacecast float addrspace(1)* %input to float*
%addr = getelementptr float, float* %generic_input, i64 10
%v = load float, float* %addr
store float %v, float* %addr
ret void
; IR-LABEL: @rauw(
; IR-NEXT: %addr = getelementptr float, float addrspace(1)* %input, i64 10
; IR-NEXT: %v = load float, float addrspace(1)* %addr
; IR-NEXT: store float %v, float addrspace(1)* %addr
; IR-NEXT: ret void
}
define void @loop() {
; IR-LABEL: @loop(
entry:
%p = addrspacecast [10 x float] addrspace(3)* @array to float*
%end = getelementptr float, float* %p, i64 10
br label %loop
loop:
%i = phi float* [ %p, %entry ], [ %i2, %loop ]
; IR: phi float addrspace(3)* [ %p, %entry ], [ %i2, %loop ]
%v = load float, float* %i
; IR: %v = load float, float addrspace(3)* %i
call void @use(float %v)
%i2 = getelementptr float, float* %i, i64 1
; IR: %i2 = getelementptr float, float addrspace(3)* %i, i64 1
%exit_cond = icmp eq float* %i2, %end
br i1 %exit_cond, label %exit, label %loop
exit:
ret void
}
@generic_end = external global float*
define void @loop_with_generic_bound() {
; IR-LABEL: @loop_with_generic_bound(
entry:
%p = addrspacecast [10 x float] addrspace(3)* @array to float*
%end = load float*, float** @generic_end
br label %loop
loop:
%i = phi float* [ %p, %entry ], [ %i2, %loop ]
; IR: phi float addrspace(3)* [ %p, %entry ], [ %i2, %loop ]
%v = load float, float* %i
; IR: %v = load float, float addrspace(3)* %i
call void @use(float %v)
%i2 = getelementptr float, float* %i, i64 1
; IR: %i2 = getelementptr float, float addrspace(3)* %i, i64 1
%exit_cond = icmp eq float* %i2, %end
; IR: addrspacecast float addrspace(3)* %i2 to float*
; IR: icmp eq float* %{{[0-9]+}}, %end
br i1 %exit_cond, label %exit, label %loop
exit:
ret void
}
declare void @llvm.nvvm.barrier0() #3
declare void @use(float)
attributes #3 = { noduplicate nounwind }
|
