// RUN: mlir-opt %s -scf-for-loop-peeling -canonicalize -split-input-file -verify-diagnostics | FileCheck %s
// RUN: mlir-opt %s -scf-for-loop-peeling=skip-partial=false -canonicalize -split-input-file -verify-diagnostics | FileCheck %s -check-prefix=CHECK-NO-SKIP
// CHECK-DAG: #[[MAP0:.*]] = affine_map<()[s0, s1, s2] -> (s1 - (-s0 + s1) mod s2)>
// CHECK-DAG: #[[MAP1:.*]] = affine_map<(d0)[s0] -> (-d0 + s0)>
// CHECK: func @fully_dynamic_bounds(
// CHECK-SAME: %[[LB:.*]]: index, %[[UB:.*]]: index, %[[STEP:.*]]: index
// CHECK: %[[C0_I32:.*]] = arith.constant 0 : i32
// CHECK: %[[NEW_UB:.*]] = affine.apply #[[MAP0]]()[%[[LB]], %[[UB]], %[[STEP]]]
// CHECK: %[[LOOP:.*]] = scf.for %[[IV:.*]] = %[[LB]] to %[[NEW_UB]]
// CHECK-SAME: step %[[STEP]] iter_args(%[[ACC:.*]] = %[[C0_I32]]) -> (i32) {
// CHECK: %[[CAST:.*]] = arith.index_cast %[[STEP]] : index to i32
// CHECK: %[[ADD:.*]] = arith.addi %[[ACC]], %[[CAST]] : i32
// CHECK: scf.yield %[[ADD]]
// CHECK: }
// CHECK: %[[RESULT:.*]] = scf.for %[[IV2:.*]] = %[[NEW_UB]] to %[[UB]]
// CHECK-SAME: step %[[STEP]] iter_args(%[[ACC2:.*]] = %[[LOOP]]) -> (i32) {
// CHECK: %[[REM:.*]] = affine.apply #[[MAP1]](%[[IV2]])[%[[UB]]]
// CHECK: %[[CAST2:.*]] = arith.index_cast %[[REM]]
// CHECK: %[[ADD2:.*]] = arith.addi %[[ACC2]], %[[CAST2]]
// CHECK: scf.yield %[[ADD2]]
// CHECK: }
// CHECK: return %[[RESULT]]
#map = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
func.func @fully_dynamic_bounds(%lb : index, %ub: index, %step: index) -> i32 {
%c0 = arith.constant 0 : i32
%r = scf.for %iv = %lb to %ub step %step iter_args(%arg = %c0) -> i32 {
%s = affine.min #map(%ub, %iv)[%step]
%casted = arith.index_cast %s : index to i32
%0 = arith.addi %arg, %casted : i32
scf.yield %0 : i32
}
return %r : i32
}
// -----
// CHECK: func @fully_static_bounds(
// CHECK-DAG: %[[C0_I32:.*]] = arith.constant 0 : i32
// CHECK-DAG: %[[C1_I32:.*]] = arith.constant 1 : i32
// CHECK-DAG: %[[C4_I32:.*]] = arith.constant 4 : i32
// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
// CHECK-DAG: %[[C4:.*]] = arith.constant 4 : index
// CHECK-DAG: %[[C16:.*]] = arith.constant 16 : index
// CHECK: %[[LOOP:.*]] = scf.for %[[IV:.*]] = %[[C0]] to %[[C16]]
// CHECK-SAME: step %[[C4]] iter_args(%[[ACC:.*]] = %[[C0_I32]]) -> (i32) {
// CHECK: %[[ADD:.*]] = arith.addi %[[ACC]], %[[C4_I32]] : i32
// CHECK: scf.yield %[[ADD]]
// CHECK: }
// CHECK: %[[RESULT:.*]] = arith.addi %[[LOOP]], %[[C1_I32]] : i32
// CHECK: return %[[RESULT]]
#map = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
func.func @fully_static_bounds() -> i32 {
%c0_i32 = arith.constant 0 : i32
%lb = arith.constant 0 : index
%step = arith.constant 4 : index
%ub = arith.constant 17 : index
%r = scf.for %iv = %lb to %ub step %step
iter_args(%arg = %c0_i32) -> i32 {
%s = affine.min #map(%ub, %iv)[%step]
%casted = arith.index_cast %s : index to i32
%0 = arith.addi %arg, %casted : i32
scf.yield %0 : i32
}
return %r : i32
}
// -----
// CHECK-DAG: #[[MAP0:.*]] = affine_map<()[s0] -> ((s0 floordiv 4) * 4)>
// CHECK-DAG: #[[MAP1:.*]] = affine_map<(d0)[s0] -> (-d0 + s0)>
// CHECK: func @dynamic_upper_bound(
// CHECK-SAME: %[[UB:.*]]: index
// CHECK-DAG: %[[C0_I32:.*]] = arith.constant 0 : i32
// CHECK-DAG: %[[C4_I32:.*]] = arith.constant 4 : i32
// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
// CHECK-DAG: %[[C4:.*]] = arith.constant 4 : index
// CHECK: %[[NEW_UB:.*]] = affine.apply #[[MAP0]]()[%[[UB]]]
// CHECK: %[[LOOP:.*]] = scf.for %[[IV:.*]] = %[[C0]] to %[[NEW_UB]]
// CHECK-SAME: step %[[C4]] iter_args(%[[ACC:.*]] = %[[C0_I32]]) -> (i32) {
// CHECK: %[[ADD:.*]] = arith.addi %[[ACC]], %[[C4_I32]] : i32
// CHECK: scf.yield %[[ADD]]
// CHECK: }
// CHECK: %[[RESULT:.*]] = scf.for %[[IV2:.*]] = %[[NEW_UB]] to %[[UB]]
// CHECK-SAME: step %[[C4]] iter_args(%[[ACC2:.*]] = %[[LOOP]]) -> (i32) {
// CHECK: %[[REM:.*]] = affine.apply #[[MAP1]](%[[IV2]])[%[[UB]]]
// CHECK: %[[CAST2:.*]] = arith.index_cast %[[REM]]
// CHECK: %[[ADD2:.*]] = arith.addi %[[ACC2]], %[[CAST2]]
// CHECK: scf.yield %[[ADD2]]
// CHECK: }
// CHECK: return %[[RESULT]]
#map = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
func.func @dynamic_upper_bound(%ub : index) -> i32 {
%c0_i32 = arith.constant 0 : i32
%lb = arith.constant 0 : index
%step = arith.constant 4 : index
%r = scf.for %iv = %lb to %ub step %step
iter_args(%arg = %c0_i32) -> i32 {
%s = affine.min #map(%ub, %iv)[%step]
%casted = arith.index_cast %s : index to i32
%0 = arith.addi %arg, %casted : i32
scf.yield %0 : i32
}
return %r : i32
}
// -----
// CHECK-DAG: #[[MAP0:.*]] = affine_map<()[s0] -> ((s0 floordiv 4) * 4)>
// CHECK-DAG: #[[MAP1:.*]] = affine_map<(d0)[s0] -> (-d0 + s0)>
// CHECK: func @no_loop_results(
// CHECK-SAME: %[[UB:.*]]: index, %[[MEMREF:.*]]: memref<i32>
// CHECK-DAG: %[[C4_I32:.*]] = arith.constant 4 : i32
// CHECK-DAG: %[[C0:.*]] = arith.constant 0 : index
// CHECK-DAG: %[[C4:.*]] = arith.constant 4 : index
// CHECK: %[[NEW_UB:.*]] = affine.apply #[[MAP0]]()[%[[UB]]]
// CHECK: scf.for %[[IV:.*]] = %[[C0]] to %[[NEW_UB]] step %[[C4]] {
// CHECK: %[[LOAD:.*]] = memref.load %[[MEMREF]][]
// CHECK: %[[ADD:.*]] = arith.addi %[[LOAD]], %[[C4_I32]] : i32
// CHECK: memref.store %[[ADD]], %[[MEMREF]]
// CHECK: }
// CHECK: scf.for %[[IV2:.*]] = %[[NEW_UB]] to %[[UB]] step %[[C4]] {
// CHECK: %[[REM:.*]] = affine.apply #[[MAP1]](%[[IV2]])[%[[UB]]]
// CHECK: %[[LOAD2:.*]] = memref.load %[[MEMREF]][]
// CHECK: %[[CAST2:.*]] = arith.index_cast %[[REM]]
// CHECK: %[[ADD2:.*]] = arith.addi %[[LOAD2]], %[[CAST2]]
// CHECK: memref.store %[[ADD2]], %[[MEMREF]]
// CHECK: }
// CHECK: return
#map = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
func.func @no_loop_results(%ub : index, %d : memref<i32>) {
%c0_i32 = arith.constant 0 : i32
%lb = arith.constant 0 : index
%step = arith.constant 4 : index
scf.for %iv = %lb to %ub step %step {
%s = affine.min #map(%ub, %iv)[%step]
%r = memref.load %d[] : memref<i32>
%casted = arith.index_cast %s : index to i32
%0 = arith.addi %r, %casted : i32
memref.store %0, %d[] : memref<i32>
}
return
}
// -----
// Test rewriting of affine.min/max ops. Make sure that more general cases than
// the ones above are successfully rewritten. Also make sure that the pattern
// does not rewrite ops that should not be rewritten.
// CHECK-DAG: #[[MAP1:.*]] = affine_map<()[s0] -> (s0 + 1)>
// CHECK-DAG: #[[MAP2:.*]] = affine_map<(d0)[s0, s1] -> (-d0 + s1 - 1, s0)>
// CHECK-DAG: #[[MAP3:.*]] = affine_map<(d0)[s0, s1, s2] -> (-d0 + s1, s2, s0)>
// CHECK-DAG: #[[MAP4:.*]] = affine_map<()[s0] -> (-s0)>
// CHECK-DAG: #[[MAP5:.*]] = affine_map<(d0)[s0] -> (-d0 + s0)>
// CHECK-DAG: #[[MAP6:.*]] = affine_map<(d0)[s0] -> (-d0 + s0 + 1)>
// CHECK-DAG: #[[MAP7:.*]] = affine_map<(d0)[s0] -> (-d0 + s0 - 1)>
// CHECK-DAG: #[[MAP8:.*]] = affine_map<(d0)[s0] -> (d0 - s0)>
// CHECK: func @test_affine_op_rewrite(
// CHECK-SAME: %[[LB:.*]]: index, %[[UB:.*]]: index, %[[STEP:.*]]: index,
// CHECK-SAME: %[[MEMREF:.*]]: memref<?xindex>, %[[SOME_VAL:.*]]: index
// CHECK: scf.for %[[IV:.*]] = %[[LB]] to %{{.*}} step %[[STEP]] {
// (affine.min folded away)
// CHECK: memref.store %[[STEP]]
// (affine.min folded away)
// CHECK: memref.store %[[STEP]]
// CHECK: %[[RES2:.*]] = affine.apply #[[MAP1]]()[%[[STEP]]]
// CHECK: memref.store %[[RES2]]
// CHECK: %[[RES3:.*]] = affine.min #[[MAP2]](%[[IV]])[%[[STEP]], %[[UB]]]
// CHECK: memref.store %[[RES3]]
// CHECK: %[[RES4:.*]] = affine.min #[[MAP3]](%[[IV]])[%[[STEP]], %[[UB]], %[[SOME_VAL]]]
// CHECK: memref.store %[[RES4]]
// CHECK: %[[RES5:.*]] = affine.apply #[[MAP4]]()[%[[STEP]]]
// CHECK: memref.store %[[RES5]]
// CHECK: }
// CHECK: scf.for %[[IV2:.*]] = {{.*}} to %[[UB]] step %[[STEP]] {
// CHECK: %[[RES_IF_0:.*]] = affine.apply #[[MAP5]](%[[IV2]])[%[[UB]]]
// CHECK: memref.store %[[RES_IF_0]]
// CHECK: %[[RES_IF_1:.*]] = affine.apply #[[MAP6]](%[[IV2]])[%[[UB]]]
// CHECK: memref.store %[[RES_IF_1]]
// CHECK: %[[RES_IF_2:.*]] = affine.apply #[[MAP6]](%[[IV2]])[%[[UB]]]
// CHECK: memref.store %[[RES_IF_2]]
// CHECK: %[[RES_IF_3:.*]] = affine.apply #[[MAP7]](%[[IV2]])[%[[UB]]]
// CHECK: memref.store %[[RES_IF_3]]
// CHECK: %[[RES_IF_4:.*]] = affine.min #[[MAP3]](%[[IV2]])[%[[STEP]], %[[UB]], %[[SOME_VAL]]]
// CHECK: memref.store %[[RES_IF_4]]
// CHECK: %[[RES_IF_5:.*]] = affine.apply #[[MAP8]](%[[IV2]])[%[[UB]]]
// CHECK: memref.store %[[RES_IF_5]]
#map0 = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
#map1 = affine_map<(d0, d1)[s0] -> (d0 - d1 + 1, s0)>
#map2 = affine_map<(d0, d1)[s0] -> (s0 + 1, d0 - d1 + 1)>
#map3 = affine_map<(d0, d1)[s0] -> (s0, d0 - d1 - 1)>
#map4 = affine_map<(d0, d1, d2)[s0] -> (s0, d0 - d1, d2)>
#map5 = affine_map<(d0, d1)[s0] -> (-s0, -d0 + d1)>
func.func @test_affine_op_rewrite(%lb : index, %ub: index,
%step: index, %d : memref<?xindex>,
%some_val: index) {
%c0 = arith.constant 0 : index
%c1 = arith.constant 1 : index
%c2 = arith.constant 2 : index
%c3 = arith.constant 3 : index
%c4 = arith.constant 4 : index
%c5 = arith.constant 5 : index
scf.for %iv = %lb to %ub step %step {
// Most common case: Rewrite min(%ub - %iv, %step) to %step.
%m0 = affine.min #map0(%ub, %iv)[%step]
memref.store %m0, %d[%c0] : memref<?xindex>
// Increase %ub - %iv a little bit, pattern should still apply.
%m1 = affine.min #map1(%ub, %iv)[%step]
memref.store %m1, %d[%c1] : memref<?xindex>
// Rewrite min(%ub - %iv + 1, %step + 1) to %step + 1.
%m2 = affine.min #map2(%ub, %iv)[%step]
memref.store %m2, %d[%c2] : memref<?xindex>
// min(%ub - %iv - 1, %step) cannot be simplified because %ub - %iv - 1
// can be smaller than %step. (Can be simplified in if-statement.)
%m3 = affine.min #map3(%ub, %iv)[%step]
memref.store %m3, %d[%c3] : memref<?xindex>
// min(%ub - %iv, %step, %some_val) cannot be simplified because the range
// of %some_val is unknown.
%m4 = affine.min #map4(%ub, %iv, %some_val)[%step]
memref.store %m4, %d[%c4] : memref<?xindex>
// Rewrite max(-%ub + %iv, -%step) to -%ub + %iv (and -%step in the scf.if).
%m5 = affine.max #map5(%ub, %iv)[%step]
memref.store %m5, %d[%c5] : memref<?xindex>
}
return
}
// -----
// CHECK: func @nested_loops
// CHECK: scf.for {{.*}} {
// CHECK: scf.for {{.*}} {
// CHECK: }
// CHECK: scf.for {{.*}} {
// CHECK: }
// CHECK: }
// CHECK: scf.for {{.*}} {
// CHECK: scf.for {{.*}} {
// CHECK: }
// CHECK-NOT: scf.for
// CHECK: }
// CHECK-NO-SKIP: func @nested_loops
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: }
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: }
// CHECK-NO-SKIP: }
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: }
// CHECK-NO-SKIP: scf.for {{.*}} {
// CHECK-NO-SKIP: }
// CHECK-NO-SKIP: }
#map = affine_map<(d0, d1)[s0] -> (s0, d0 - d1)>
func.func @nested_loops(%lb0: index, %lb1 : index, %ub0: index, %ub1: index,
%step: index) -> i32 {
%c0 = arith.constant 0 : i32
%r0 = scf.for %iv0 = %lb0 to %ub0 step %step iter_args(%arg0 = %c0) -> i32 {
%r1 = scf.for %iv1 = %lb1 to %ub1 step %step iter_args(%arg1 = %arg0) -> i32 {
%s = affine.min #map(%ub1, %iv1)[%step]
%casted = arith.index_cast %s : index to i32
%0 = arith.addi %arg1, %casted : i32
scf.yield %0 : i32
}
%1 = arith.addi %arg0, %r1 : i32
scf.yield %1 : i32
}
return %r0 : i32
}
// -----
// CHECK-LABEL: func @regression
func.func @regression(%arg0: memref<i64>, %arg1: index) {
%c0 = arith.constant 0 : index
%0 = affine.apply affine_map<()[s0] -> (s0 * s0)>()[%arg1]
scf.for %arg2 = %c0 to %0 step %arg1 {
%1 = affine.min affine_map<(d0)[s0] -> (s0, -d0 + s0 * s0)>(%arg2)[%arg1]
%2 = arith.index_cast %0 : index to i64
memref.store %2, %arg0[] : memref<i64>
}
return
}
// -----
// Regression test: Make sure that we do not crash.
// CHECK-LABEL: func @zero_step(
// CHECK: scf.for
// CHECK: scf.for
func.func @zero_step(%arg0: memref<i64>) {
%c0 = arith.constant 0 : index
%c1 = arith.constant 1 : index
%foldto0 = arith.subi %c1, %c1 : index
scf.for %arg2 = %c0 to %c1 step %foldto0 {
%2 = arith.index_cast %arg2 : index to i64
memref.store %2, %arg0[] : memref<i64>
}
return
}
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