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[mlir][SCF] Multiply lower bound in loop range folding #111875

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Merged
merged 2 commits into from
Oct 14, 2024
Merged

[mlir][SCF] Multiply lower bound in loop range folding #111875

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9a9169c
multiply lower bound in loop range folding
superlopuh Oct 10, 2024
230e32c
remove unnecessary test case
superlopuh Oct 14, 2024
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2 changes: 2 additions & 0 deletions mlir/lib/Dialect/SCF/Transforms/LoopRangeFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -72,9 +72,11 @@ void ForLoopRangeFolding::runOnOperation() {
op.setUpperBound(ubFold->getResult(0));

} else if (isa<arith::MulIOp>(user)) {
Operation *lbFold = b.clone(*user, lbMap);
Operation *ubFold = b.clone(*user, ubMap);
Operation *stepFold = b.clone(*user, stepMap);

op.setLowerBound(lbFold->getResult(0));
op.setUpperBound(ubFold->getResult(0));
op.setStep(stepFold->getResult(0));
}
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45 changes: 25 additions & 20 deletions mlir/test/Dialect/SCF/loop-range.mlir
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Expand Up @@ -21,12 +21,13 @@ func.func @fold_one_loop(%arg0: memref<?xi32>, %arg1: index, %arg2: index) {
// CHECK: %[[C4:.*]] = arith.constant 4 : index
// CHECK: %[[I0:.*]] = arith.addi %[[ARG2]], %[[C0]] : index
// CHECK: %[[I1:.*]] = arith.addi %[[ARG2]], %[[ARG1]] : index
// CHECK: %[[I2:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[I0]] to %[[I2]] step %[[I3]] {
// CHECK: %[[I4:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I5:.*]] = arith.muli %[[I4]], %[[I4]] : i32
// CHECK: memref.store %[[I5]], %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I2:.*]] = arith.muli %[[I0]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I4:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[I2]] to %[[I3]] step %[[I4]] {
// CHECK: %[[I5:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I6:.*]] = arith.muli %[[I5]], %[[I5]] : i32
// CHECK: memref.store %[[I6]], %[[ARG0]]{{\[}}%[[I]]

func.func @fold_one_loop2(%arg0: memref<?xi32>, %arg1: index, %arg2: index) {
%c0 = arith.constant 0 : index
Expand Down Expand Up @@ -54,12 +55,13 @@ func.func @fold_one_loop2(%arg0: memref<?xi32>, %arg1: index, %arg2: index) {
// CHECK: scf.for %[[J:.*]] = %[[C0]] to %[[C10]] step %[[C1]] {
// CHECK: %[[I0:.*]] = arith.addi %[[ARG2]], %[[C0]] : index
// CHECK: %[[I1:.*]] = arith.addi %[[ARG2]], %[[ARG1]] : index
// CHECK: %[[I2:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[I0]] to %[[I2]] step %[[I3]] {
// CHECK: %[[I4:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I5:.*]] = arith.muli %[[I4]], %[[I4]] : i32
// CHECK: memref.store %[[I5]], %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I2:.*]] = arith.muli %[[I0]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I4:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[I2]] to %[[I3]] step %[[I4]] {
// CHECK: %[[I5:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I6:.*]] = arith.muli %[[I5]], %[[I5]] : i32
// CHECK: memref.store %[[I6]], %[[ARG0]]{{\[}}%[[I]]

func.func @fold_two_loops(%arg0: memref<?xi32>, %arg1: index, %arg2: index) {
%c0 = arith.constant 0 : index
Expand All @@ -86,14 +88,17 @@ func.func @fold_two_loops(%arg0: memref<?xi32>, %arg1: index, %arg2: index) {
// CHECK: %[[C10:.*]] = arith.constant 10 : index
// CHECK: %[[I0:.*]] = arith.addi %[[ARG2]], %[[C0]] : index
// CHECK: %[[I1:.*]] = arith.addi %[[ARG2]], %[[C10]] : index
// CHECK: scf.for %[[J:.*]] = %[[I0]] to %[[I1]] step %[[C1]] {
// CHECK: %[[I1:.*]] = arith.addi %[[ARG2]], %[[ARG1]] : index
// CHECK: %[[I2:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[J]] to %[[I2]] step %[[I3]] {
// CHECK: %[[I4:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I5:.*]] = arith.muli %[[I4]], %[[I4]] : i32
// CHECK: memref.store %[[I5]], %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I2:.*]] = arith.muli %[[I0]], %[[C4]] : index
// CHECK: %[[I3:.*]] = arith.muli %[[I1]], %[[C4]] : index
// CHECK: %[[I4:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[J:.*]] = %[[I2]] to %[[I3]] step %[[I4]] {
// CHECK: %[[I5:.*]] = arith.addi %[[ARG2]], %[[ARG1]] : index
// CHECK: %[[I6:.*]] = arith.muli %[[I5]], %[[C4]] : index
// CHECK: %[[I7:.*]] = arith.muli %[[C1]], %[[C4]] : index
// CHECK: scf.for %[[I:.*]] = %[[J]] to %[[I6]] step %[[I7]] {
// CHECK: %[[I8:.*]] = memref.load %[[ARG0]]{{\[}}%[[I]]
// CHECK: %[[I9:.*]] = arith.muli %[[I8]], %[[I8]] : i32
// CHECK: memref.store %[[I9]], %[[ARG0]]{{\[}}%[[I]]

// If an instruction's operands are not defined outside the loop, we cannot
// perform the optimization, as is the case with the arith.muli below. (If
Expand Down
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