1 // RUN: mlir-opt -allow-unregistered-dialect %s -memref-dataflow-opt | FileCheck %s
3 // CHECK-DAG: [[$MAP0:#map[0-9]+]] = affine_map<(d0, d1) -> (d1 + 1)>
4 // CHECK-DAG: [[$MAP1:#map[0-9]+]] = affine_map<(d0, d1) -> (d0)>
5 // CHECK-DAG: [[$MAP2:#map[0-9]+]] = affine_map<(d0, d1) -> (d1)>
6 // CHECK-DAG: [[$MAP3:#map[0-9]+]] = affine_map<(d0, d1) -> (d0 - 1)>
7 // CHECK-DAG: [[$MAP4:#map[0-9]+]] = affine_map<(d0) -> (d0 + 1)>
9 // CHECK-LABEL: func @simple_store_load() {
10 func @simple_store_load() {
11 %cf7 = constant 7.0 : f32
12 %m = alloc() : memref<10xf32>
13 affine.for %i0 = 0 to 10 {
14 affine.store %cf7, %m[%i0] : memref<10xf32>
15 %v0 = affine.load %m[%i0] : memref<10xf32>
16 %v1 = addf %v0, %v0 : f32
19 // CHECK: %{{.*}} = constant 7.000000e+00 : f32
20 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
21 // CHECK-NEXT: %{{.*}} = addf %{{.*}}, %{{.*}} : f32
26 // CHECK-LABEL: func @multi_store_load() {
27 func @multi_store_load() {
28 %c0 = constant 0 : index
29 %cf7 = constant 7.0 : f32
30 %cf8 = constant 8.0 : f32
31 %cf9 = constant 9.0 : f32
32 %m = alloc() : memref<10xf32>
33 affine.for %i0 = 0 to 10 {
34 affine.store %cf7, %m[%i0] : memref<10xf32>
35 %v0 = affine.load %m[%i0] : memref<10xf32>
36 %v1 = addf %v0, %v0 : f32
37 affine.store %cf8, %m[%i0] : memref<10xf32>
38 affine.store %cf9, %m[%i0] : memref<10xf32>
39 %v2 = affine.load %m[%i0] : memref<10xf32>
40 %v3 = affine.load %m[%i0] : memref<10xf32>
41 %v4 = mulf %v2, %v3 : f32
44 // CHECK: %{{.*}} = constant 0 : index
45 // CHECK-NEXT: %{{.*}} = constant 7.000000e+00 : f32
46 // CHECK-NEXT: %{{.*}} = constant 8.000000e+00 : f32
47 // CHECK-NEXT: %{{.*}} = constant 9.000000e+00 : f32
48 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
49 // CHECK-NEXT: %{{.*}} = addf %{{.*}}, %{{.*}} : f32
50 // CHECK-NEXT: %{{.*}} = mulf %{{.*}}, %{{.*}} : f32
56 // The store-load forwarding can see through affine apply's since it relies on
57 // dependence information.
58 // CHECK-LABEL: func @store_load_affine_apply
59 func @store_load_affine_apply() -> memref<10x10xf32> {
60 %cf7 = constant 7.0 : f32
61 %m = alloc() : memref<10x10xf32>
62 affine.for %i0 = 0 to 10 {
63 affine.for %i1 = 0 to 10 {
64 %t0 = affine.apply affine_map<(d0, d1) -> (d1 + 1)>(%i0, %i1)
65 %t1 = affine.apply affine_map<(d0, d1) -> (d0)>(%i0, %i1)
66 %idx0 = affine.apply affine_map<(d0, d1) -> (d1)> (%t0, %t1)
67 %idx1 = affine.apply affine_map<(d0, d1) -> (d0 - 1)> (%t0, %t1)
68 affine.store %cf7, %m[%idx0, %idx1] : memref<10x10xf32>
69 // CHECK-NOT: affine.load %{{[0-9]+}}
70 %v0 = affine.load %m[%i0, %i1] : memref<10x10xf32>
71 %v1 = addf %v0, %v0 : f32
74 // The memref and its stores won't be erased due to this memref return.
75 return %m : memref<10x10xf32>
76 // CHECK: %{{.*}} = constant 7.000000e+00 : f32
77 // CHECK-NEXT: %{{.*}} = alloc() : memref<10x10xf32>
78 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
79 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
80 // CHECK-NEXT: %{{.*}} = affine.apply [[$MAP0]](%{{.*}}, %{{.*}})
81 // CHECK-NEXT: %{{.*}} = affine.apply [[$MAP1]](%{{.*}}, %{{.*}})
82 // CHECK-NEXT: %{{.*}} = affine.apply [[$MAP2]](%{{.*}}, %{{.*}})
83 // CHECK-NEXT: %{{.*}} = affine.apply [[$MAP3]](%{{.*}}, %{{.*}})
84 // CHECK-NEXT: affine.store %{{.*}}, %{{.*}}[%{{.*}}, %{{.*}}] : memref<10x10xf32>
85 // CHECK-NEXT: %{{.*}} = addf %{{.*}}, %{{.*}} : f32
88 // CHECK-NEXT: return %{{.*}} : memref<10x10xf32>
91 // CHECK-LABEL: func @store_load_nested
92 func @store_load_nested(%N : index) {
93 %cf7 = constant 7.0 : f32
94 %m = alloc() : memref<10xf32>
95 affine.for %i0 = 0 to 10 {
96 affine.store %cf7, %m[%i0] : memref<10xf32>
97 affine.for %i1 = 0 to %N {
98 %v0 = affine.load %m[%i0] : memref<10xf32>
99 %v1 = addf %v0, %v0 : f32
103 // CHECK: %{{.*}} = constant 7.000000e+00 : f32
104 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
105 // CHECK-NEXT: affine.for %{{.*}} = 0 to %{{.*}} {
106 // CHECK-NEXT: %{{.*}} = addf %{{.*}}, %{{.*}} : f32
109 // CHECK-NEXT: return
112 // No forwarding happens here since either of the two stores could be the last
113 // writer; store/load forwarding will however be possible here once loop live
114 // out SSA scalars are available.
115 // CHECK-LABEL: func @multi_store_load_nested_no_fwd
116 func @multi_store_load_nested_no_fwd(%N : index) {
117 %cf7 = constant 7.0 : f32
118 %cf8 = constant 8.0 : f32
119 %m = alloc() : memref<10xf32>
120 affine.for %i0 = 0 to 10 {
121 affine.store %cf7, %m[%i0] : memref<10xf32>
122 affine.for %i1 = 0 to %N {
123 affine.store %cf8, %m[%i1] : memref<10xf32>
125 affine.for %i2 = 0 to %N {
126 // CHECK: %{{[0-9]+}} = affine.load %{{.*}}[%{{.*}}] : memref<10xf32>
127 %v0 = affine.load %m[%i0] : memref<10xf32>
128 %v1 = addf %v0, %v0 : f32
134 // No forwarding happens here since both stores have a value going into
136 // CHECK-LABEL: func @store_load_store_nested_no_fwd
137 func @store_load_store_nested_no_fwd(%N : index) {
138 %cf7 = constant 7.0 : f32
139 %cf9 = constant 9.0 : f32
140 %m = alloc() : memref<10xf32>
141 affine.for %i0 = 0 to 10 {
142 affine.store %cf7, %m[%i0] : memref<10xf32>
143 affine.for %i1 = 0 to %N {
144 // CHECK: %{{[0-9]+}} = affine.load %{{.*}}[%{{.*}}] : memref<10xf32>
145 %v0 = affine.load %m[%i0] : memref<10xf32>
146 %v1 = addf %v0, %v0 : f32
147 affine.store %cf9, %m[%i0] : memref<10xf32>
153 // Forwarding happens here since the last store postdominates all other stores
154 // and other forwarding criteria are satisfied.
155 // CHECK-LABEL: func @multi_store_load_nested_fwd
156 func @multi_store_load_nested_fwd(%N : index) {
157 %cf7 = constant 7.0 : f32
158 %cf8 = constant 8.0 : f32
159 %cf9 = constant 9.0 : f32
160 %cf10 = constant 10.0 : f32
161 %m = alloc() : memref<10xf32>
162 affine.for %i0 = 0 to 10 {
163 affine.store %cf7, %m[%i0] : memref<10xf32>
164 affine.for %i1 = 0 to %N {
165 affine.store %cf8, %m[%i1] : memref<10xf32>
167 affine.for %i2 = 0 to %N {
168 affine.store %cf9, %m[%i2] : memref<10xf32>
170 affine.store %cf10, %m[%i0] : memref<10xf32>
171 affine.for %i3 = 0 to %N {
172 // CHECK-NOT: %{{[0-9]+}} = affine.load
173 %v0 = affine.load %m[%i0] : memref<10xf32>
174 %v1 = addf %v0, %v0 : f32
180 // There is no unique load location for the store to forward to.
181 // CHECK-LABEL: func @store_load_no_fwd
182 func @store_load_no_fwd() {
183 %cf7 = constant 7.0 : f32
184 %m = alloc() : memref<10xf32>
185 affine.for %i0 = 0 to 10 {
186 affine.store %cf7, %m[%i0] : memref<10xf32>
187 affine.for %i1 = 0 to 10 {
188 affine.for %i2 = 0 to 10 {
189 // CHECK: affine.load %{{[0-9]+}}
190 %v0 = affine.load %m[%i2] : memref<10xf32>
191 %v1 = addf %v0, %v0 : f32
198 // Forwarding happens here as there is a one-to-one store-load correspondence.
199 // CHECK-LABEL: func @store_load_fwd
200 func @store_load_fwd() {
201 %cf7 = constant 7.0 : f32
202 %c0 = constant 0 : index
203 %m = alloc() : memref<10xf32>
204 affine.store %cf7, %m[%c0] : memref<10xf32>
205 affine.for %i0 = 0 to 10 {
206 affine.for %i1 = 0 to 10 {
207 affine.for %i2 = 0 to 10 {
208 // CHECK-NOT: affine.load %{{[0-9]}}+
209 %v0 = affine.load %m[%c0] : memref<10xf32>
210 %v1 = addf %v0, %v0 : f32
217 // Although there is a dependence from the second store to the load, it is
218 // satisfied by the outer surrounding loop, and does not prevent the first
219 // store to be forwarded to the load.
220 func @store_load_store_nested_fwd(%N : index) -> f32 {
221 %cf7 = constant 7.0 : f32
222 %cf9 = constant 9.0 : f32
223 %c0 = constant 0 : index
224 %c1 = constant 1 : index
225 %m = alloc() : memref<10xf32>
226 affine.for %i0 = 0 to 10 {
227 affine.store %cf7, %m[%i0] : memref<10xf32>
228 affine.for %i1 = 0 to %N {
229 %v0 = affine.load %m[%i0] : memref<10xf32>
230 %v1 = addf %v0, %v0 : f32
231 %idx = affine.apply affine_map<(d0) -> (d0 + 1)> (%i0)
232 affine.store %cf9, %m[%idx] : memref<10xf32>
235 // Due to this load, the memref isn't optimized away.
236 %v3 = affine.load %m[%c1] : memref<10xf32>
238 // CHECK: %{{.*}} = alloc() : memref<10xf32>
239 // CHECK-NEXT: affine.for %{{.*}} = 0 to 10 {
240 // CHECK-NEXT: affine.store %{{.*}}, %{{.*}}[%{{.*}}] : memref<10xf32>
241 // CHECK-NEXT: affine.for %{{.*}} = 0 to %{{.*}} {
242 // CHECK-NEXT: %{{.*}} = addf %{{.*}}, %{{.*}} : f32
243 // CHECK-NEXT: %{{.*}} = affine.apply [[$MAP4]](%{{.*}})
244 // CHECK-NEXT: affine.store %{{.*}}, %{{.*}}[%{{.*}}] : memref<10xf32>
247 // CHECK-NEXT: %{{.*}} = affine.load %{{.*}}[%{{.*}}] : memref<10xf32>
248 // CHECK-NEXT: return %{{.*}} : f32
251 // CHECK-LABEL: func @should_not_fwd
252 func @should_not_fwd(%A: memref<100xf32>, %M : index, %N : index) -> f32 {
253 %cf = constant 0.0 : f32
254 affine.store %cf, %A[%M] : memref<100xf32>
255 // CHECK: affine.load %{{.*}}[%{{.*}}]
256 %v = affine.load %A[%N] : memref<100xf32>
260 // Can store forward to A[%j, %i], but no forwarding to load on %A[%i, %j]
261 // CHECK-LABEL: func @refs_not_known_to_be_equal
262 func @refs_not_known_to_be_equal(%A : memref<100 x 100 x f32>, %M : index) {
263 %N = affine.apply affine_map<(d0) -> (d0 + 1)> (%M)
264 %cf1 = constant 1.0 : f32
265 affine.for %i = 0 to 100 {
266 // CHECK: affine.for %[[I:.*]] =
267 affine.for %j = 0 to 100 {
268 // CHECK: affine.for %[[J:.*]] =
269 // CHECK: affine.load %{{.*}}[%[[I]], %[[J]]]
270 %u = affine.load %A[%i, %j] : memref<100x100xf32>
271 // CHECK-NEXT: affine.store %{{.*}}, %{{.*}}[%[[J]], %[[I]]]
272 affine.store %cf1, %A[%j, %i] : memref<100x100xf32>
273 // CHECK-NEXT: affine.load %{{.*}}[%[[I]], %[[J]]]
274 %v = affine.load %A[%i, %j] : memref<100x100xf32>
275 // This load should disappear.
276 %w = affine.load %A[%j, %i] : memref<100x100xf32>
278 "foo" (%u, %v, %w) : (f32, f32, f32) -> ()
284 // The test checks for value forwarding from vector stores to vector loads.
285 // The value loaded from %in can directly be stored to %out by eliminating
286 // store and load from %tmp.
287 func @vector_forwarding(%in : memref<512xf32>, %out : memref<512xf32>) {
288 %tmp = alloc() : memref<512xf32>
289 affine.for %i = 0 to 16 {
290 %ld0 = affine.vector_load %in[32*%i] : memref<512xf32>, vector<32xf32>
291 affine.vector_store %ld0, %tmp[32*%i] : memref<512xf32>, vector<32xf32>
292 %ld1 = affine.vector_load %tmp[32*%i] : memref<512xf32>, vector<32xf32>
293 affine.vector_store %ld1, %out[32*%i] : memref<512xf32>, vector<32xf32>
298 // CHECK-LABEL: func @vector_forwarding
299 // CHECK: affine.for %{{.*}} = 0 to 16 {
300 // CHECK-NEXT: %[[LDVAL:.*]] = affine.vector_load
301 // CHECK-NEXT: affine.vector_store %[[LDVAL]],{{.*}}