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[mlir][scf] Add no_inline attribute to scf.execute_region #151352

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Merged
merged 4 commits into from
Jul 31, 2025
Merged

[mlir][scf] Add no_inline attribute to scf.execute_region #151352

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8c83c3d
[mlir][scf] Add `no_inline` attribute to `scf.execute_region`
jungpark-mlir Jul 30, 2025
21c92a2
Let attribute as a keyword
jungpark-mlir Jul 30, 2025
3564d75
format
jungpark-mlir Jul 30, 2025
03a3c0b
Revised dosument from the review.
jungpark-mlir Jul 31, 2025
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15 changes: 15 additions & 0 deletions mlir/include/mlir/Dialect/SCF/IR/SCFOps.td
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,9 @@ def ExecuteRegionOp : SCF_Op<"execute_region", [
be accessed inside the op. The op's region can have multiple blocks and the
blocks can have multiple distinct terminators. Values returned from this op's
region define the op's results.
The optional 'no_inline' flag can be set to request the ExecuteRegionOp to be
preserved as much as possible and not being inlined in the parent block until
an explicit lowering step.

Example:

Expand All @@ -98,6 +101,14 @@ def ExecuteRegionOp : SCF_Op<"execute_region", [
}
}

// the same as above but with no_inline attribute
scf.for %i = 0 to 128 step %c1 {
%y = scf.execute_region -> i32 no_inline {
%x = load %A[%i] : memref<128xi32>
scf.yield %x : i32
}
}

affine.for %i = 0 to 100 {
"foo"() : () -> ()
%v = scf.execute_region -> i64 {
Expand All @@ -119,6 +130,10 @@ def ExecuteRegionOp : SCF_Op<"execute_region", [
```
}];

let arguments = (ins
UnitAttr:$no_inline
);

let results = (outs Variadic<AnyType>);

let regions = (region AnyRegion:$region);
Expand Down
8 changes: 6 additions & 2 deletions mlir/lib/Dialect/SCF/IR/SCF.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,9 @@ ParseResult ExecuteRegionOp::parse(OpAsmParser &parser,
if (parser.parseOptionalArrowTypeList(result.types))
return failure();

if (succeeded(parser.parseOptionalKeyword("no_inline")))
result.addAttribute("no_inline", parser.getBuilder().getUnitAttr());

// Introduce the body region and parse it.
Region *body = result.addRegion();
if (parser.parseRegion(*body, /*arguments=*/{}, /*argTypes=*/{}) ||
Expand All @@ -148,8 +151,9 @@ ParseResult ExecuteRegionOp::parse(OpAsmParser &parser,

void ExecuteRegionOp::print(OpAsmPrinter &p) {
p.printOptionalArrowTypeList(getResultTypes());

p << ' ';
if (getNoInline())
p << "no_inline ";
p.printRegion(getRegion(),
/*printEntryBlockArgs=*/false,
/*printBlockTerminators=*/true);
Expand Down Expand Up @@ -184,7 +188,7 @@ struct SingleBlockExecuteInliner : public OpRewritePattern<ExecuteRegionOp> {

LogicalResult matchAndRewrite(ExecuteRegionOp op,
PatternRewriter &rewriter) const override {
if (!op.getRegion().hasOneBlock())
if (!op.getRegion().hasOneBlock() || op.getNoInline())
return failure();
replaceOpWithRegion(rewriter, op, op.getRegion());
return success();
Expand Down
34 changes: 28 additions & 6 deletions mlir/test/Dialect/SCF/canonicalize.mlir
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Original file line number Diff line number Diff line change
Expand Up @@ -1440,8 +1440,8 @@ func.func @propagate_into_execute_region() {

// -----

// CHECK-LABEL: func @execute_region_elim
func.func @execute_region_elim() {
// CHECK-LABEL: func @execute_region_inline
func.func @execute_region_inline() {
affine.for %i = 0 to 100 {
"test.foo"() : () -> ()
%v = scf.execute_region -> i64 {
Expand All @@ -1461,8 +1461,30 @@ func.func @execute_region_elim() {

// -----

// CHECK-LABEL: func @func_execute_region_elim
func.func @func_execute_region_elim() {
// CHECK-LABEL: func @execute_region_no_inline
func.func @execute_region_no_inline() {
affine.for %i = 0 to 100 {
"test.foo"() : () -> ()
%v = scf.execute_region -> i64 no_inline {
%x = "test.val"() : () -> i64
scf.yield %x : i64
}
"test.bar"(%v) : (i64) -> ()
}
return
}

// CHECK-NEXT: affine.for %arg0 = 0 to 100 {
// CHECK-NEXT: "test.foo"() : () -> ()
// CHECK-NEXT: scf.execute_region
// CHECK-NEXT: %[[VAL:.*]] = "test.val"() : () -> i64
// CHECK-NEXT: scf.yield %[[VAL]] : i64
// CHECK-NEXT: }

// -----

// CHECK-LABEL: func @func_execute_region_inline
func.func @func_execute_region_inline() {
"test.foo"() : () -> ()
%v = scf.execute_region -> i64 {
%c = "test.cmp"() : () -> i1
Expand Down Expand Up @@ -1496,8 +1518,8 @@ func.func @func_execute_region_elim() {

// -----

// CHECK-LABEL: func @func_execute_region_elim_multi_yield
func.func @func_execute_region_elim_multi_yield() {
// CHECK-LABEL: func @func_execute_region_inline_multi_yield
func.func @func_execute_region_inline_multi_yield() {
"test.foo"() : () -> ()
%v = scf.execute_region -> i64 {
%c = "test.cmp"() : () -> i1
Expand Down