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[mlir] Fix scf.for single iteration canonicalization check 

We should be check whether lb + step >= ub to determine
whether this is a single iteration. Previously we were
checking lb + lb >= ub.

Differential Revision: https://reviews.llvm.org/D95440
This commit is contained in:
Lei Zhang 2021-02-02 08:30:10 -05:00
parent eb3426a528
commit b2b35697dc
3 changed files with 38 additions and 18 deletions
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2
mlir/lib/Dialect/SCF/SCF.cpp
View File

@ -547,7 +547,7 @@ struct SimplifyTrivialLoops : public OpRewritePattern<ForOp> {
// If the loop is known to have 1 iteration, inline its body and remove the
// loop.
llvm::APInt stepValue = lb.getValue().cast<IntegerAttr>().getValue();
llvm::APInt stepValue = step.getValue().cast<IntegerAttr>().getValue();
if ((lbValue + stepValue).sge(ubValue)) {
SmallVector<Value, 4> blockArgs;
blockArgs.reserve(op.getNumIterOperands() + 1);

30
mlir/test/Dialect/Linalg/fusion.mlir
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@ -665,9 +665,9 @@ func @fusion_of_three(%arg0: memref<100x10xf32>,
#map1 = affine_map<(d0, d1, d2, d3)[s0, s1, s2, s3, s4] -> (d0 * s1 + s0 + d1 * s2 + d2 * s3 + d3 * s4)>
#map2 = affine_map<()[s0] -> (s0 + 3)>
func @fill_and_conv(%arg0: memref<1x4x5x1xf32>, %arg1: memref<2x3x1x1xf32>, %arg2: memref<1x4x5x1xf32>) {
func @fill_and_conv(%arg0: memref<?x?x?x?xf32>, %arg1: memref<2x3x1x1xf32>, %arg2: memref<?x?x?x?xf32>) {
%cst = constant 0.000000e+00 : f32
linalg.fill(%arg2, %cst) : memref<1x4x5x1xf32>, f32
linalg.fill(%arg2, %cst) : memref<?x?x?x?xf32>, f32
%c4 = constant 4 : index
%c1 = constant 1 : index
@ -676,13 +676,13 @@ func @fill_and_conv(%arg0: memref<1x4x5x1xf32>, %arg1: memref<2x3x1x1xf32>, %arg
%c3 = constant 3 : index
%4 = dim %arg1, %c0 : memref<2x3x1x1xf32>
%5 = dim %arg1, %c1 : memref<2x3x1x1xf32>
%6 = dim %arg0, %c0 : memref<1x4x5x1xf32>
%7 = dim %arg0, %c1 : memref<1x4x5x1xf32>
%8 = dim %arg0, %c3 : memref<1x4x5x1xf32>
%9 = dim %arg2, %c0 : memref<1x4x5x1xf32>
%10 = dim %arg2, %c1 : memref<1x4x5x1xf32>
%11 = dim %arg2, %c2 : memref<1x4x5x1xf32>
%12 = dim %arg2, %c3 : memref<1x4x5x1xf32>
%6 = dim %arg0, %c0 : memref<?x?x?x?xf32>
%7 = dim %arg0, %c1 : memref<?x?x?x?xf32>
%8 = dim %arg0, %c3 : memref<?x?x?x?xf32>
%9 = dim %arg2, %c0 : memref<?x?x?x?xf32>
%10 = dim %arg2, %c1 : memref<?x?x?x?xf32>
%11 = dim %arg2, %c2 : memref<?x?x?x?xf32>
%12 = dim %arg2, %c3 : memref<?x?x?x?xf32>
%13 = linalg.range %c0 : %6 : %c2 : !linalg.range
%14 = linalg.range %c0 : %10 : %c3 : !linalg.range
scf.for %arg3 = %c0 to %6 step %c2 {
@ -690,14 +690,14 @@ func @fill_and_conv(%arg0: memref<1x4x5x1xf32>, %arg1: memref<2x3x1x1xf32>, %arg
%15 = affine.min #map0(%c2, %c1, %arg3)
%16 = affine.apply #map2()[%7]
%17 = affine.min #map0(%16, %c4, %arg4)
%18 = dim %arg0, %c2 : memref<1x4x5x1xf32>
%19 = dim %arg0, %c3 : memref<1x4x5x1xf32>
%20 = subview %arg0[%arg3, %arg4, %c0, %c0] [%15, %17, %18, %19] [%c1, %c1, %c1, %c1] : memref<1x4x5x1xf32> to memref<?x?x?x?xf32, #map1>
%18 = dim %arg0, %c2 : memref<?x?x?x?xf32>
%19 = dim %arg0, %c3 : memref<?x?x?x?xf32>
%20 = subview %arg0[%arg3, %arg4, %c0, %c0] [%15, %17, %18, %19] [%c1, %c1, %c1, %c1] : memref<?x?x?x?xf32> to memref<?x?x?x?xf32, #map1>
%21 = affine.min #map0(%c2, %c1, %arg3)
%22 = affine.min #map0(%c3, %c4, %arg4)
%23 = dim %arg2, %c2 : memref<1x4x5x1xf32>
%24 = dim %arg2, %c3 : memref<1x4x5x1xf32>
%25 = subview %arg2[%arg3, %arg4, %c0, %c0] [%21, %22, %23, %24] [%c1, %c1, %c1, %c1] : memref<1x4x5x1xf32> to memref<?x?x?x?xf32, #map1>
%23 = dim %arg2, %c2 : memref<?x?x?x?xf32>
%24 = dim %arg2, %c3 : memref<?x?x?x?xf32>
%25 = subview %arg2[%arg3, %arg4, %c0, %c0] [%21, %22, %23, %24] [%c1, %c1, %c1, %c1] : memref<?x?x?x?xf32> to memref<?x?x?x?xf32, #map1>
linalg.conv(%arg1, %20, %25) {dilations = [1, 1], strides = [1, 1]} : memref<2x3x1x1xf32>, memref<?x?x?x?xf32, #map1>, memref<?x?x?x?xf32, #map1>
}
}

24
mlir/test/Dialect/SCF/canonicalize.mlir
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@ -233,8 +233,8 @@ func @remove_zero_iteration_loop_vals(%arg0: index) {
return
}
// CHECK-LABEL: @replace_single_iteration_loop
func @replace_single_iteration_loop() {
// CHECK-LABEL: @replace_single_iteration_loop_1
func @replace_single_iteration_loop_1() {
// CHECK: %[[LB:.*]] = constant 42
%c42 = constant 42 : index
%c43 = constant 43 : index
@ -252,6 +252,26 @@ func @replace_single_iteration_loop() {
return
}
// CHECK-LABEL: @replace_single_iteration_loop_2
func @replace_single_iteration_loop_2() {
// CHECK: %[[LB:.*]] = constant 5
%c5 = constant 5 : index
%c6 = constant 6 : index
%c11 = constant 11 : index
// CHECK: %[[INIT:.*]] = "test.init"
%init = "test.init"() : () -> i32
// CHECK-NOT: scf.for
// CHECK: %[[VAL:.*]] = "test.op"(%[[LB]], %[[INIT]])
%0 = scf.for %i = %c5 to %c11 step %c6 iter_args(%arg = %init) -> (i32) {
%1 = "test.op"(%i, %arg) : (index, i32) -> i32
scf.yield %1 : i32
}
// CHECK: "test.consume"(%[[VAL]])
"test.consume"(%0) : (i32) -> ()
return
}
// CHECK-LABEL: @replace_single_iteration_loop_non_unit_step
func @replace_single_iteration_loop_non_unit_step() {
// CHECK: %[[LB:.*]] = constant 42