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[MLIR][Vector] Support vector reduction for xor/maxnumf/minnumf #163310

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[MLIR][Vector] Support vector reduction for xor/maxnumf/minnumf #163310

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6300dae
Support vector reduction for xor/maxnumf/minnumf
leewei05 Oct 14, 2025
cf39b25
Update variable names
leewei05 Oct 23, 2025
08a1706
Add minnumf maxnumf conversion test
leewei05 Oct 23, 2025
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5 changes: 3 additions & 2 deletions mlir/lib/Dialect/Affine/Analysis/AffineAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -66,9 +66,10 @@ static Value getSupportedReduction(AffineForOp forOp, unsigned pos,
.Case([](arith::MaxSIOp) { return arith::AtomicRMWKind::maxs; })
.Case([](arith::MinUIOp) { return arith::AtomicRMWKind::minu; })
.Case([](arith::MaxUIOp) { return arith::AtomicRMWKind::maxu; })
.Case([](arith::XOrIOp) { return arith::AtomicRMWKind::xori; })
.Case([](arith::MaxNumFOp) { return arith::AtomicRMWKind::maxnumf; })
.Case([](arith::MinNumFOp) { return arith::AtomicRMWKind::minnumf; })
.Default([](Operation *) -> std::optional<arith::AtomicRMWKind> {
// TODO: AtomicRMW supports other kinds of reductions this is
// currently not detecting, add those when the need arises.
return std::nullopt;
});
if (!maybeKind)
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10 changes: 9 additions & 1 deletion mlir/lib/Dialect/Vector/IR/VectorOps.cpp
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Expand Up @@ -717,7 +717,15 @@ Value mlir::vector::getVectorReductionOp(arith::AtomicRMWKind op,
case arith::AtomicRMWKind::ori:
return vector::ReductionOp::create(builder, vector.getLoc(),
CombiningKind::OR, vector);
// TODO: Add remaining reduction operations.
case arith::AtomicRMWKind::minnumf:
return vector::ReductionOp::create(builder, vector.getLoc(),
CombiningKind::MINNUMF, vector);
case arith::AtomicRMWKind::maxnumf:
return vector::ReductionOp::create(builder, vector.getLoc(),
CombiningKind::MAXNUMF, vector);
case arith::AtomicRMWKind::xori:
return vector::ReductionOp::create(builder, vector.getLoc(),
CombiningKind::XOR, vector);
default:
(void)emitOptionalError(loc, "Reduction operation type not supported");
break;
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36 changes: 36 additions & 0 deletions mlir/test/Conversion/ConvertToSPIRV/vector.mlir
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Expand Up @@ -275,6 +275,42 @@ func.func @reduction_minimumf(%v : vector<3xf32>, %s: f32) -> f32 {

// -----

// CHECK-LABEL: spirv.func @reduction_minnumf(
// CHECK-SAME: %[[V:.*]]: vector<3xf32>,
// CHECK-SAME: %[[S:.*]]: f32) -> f32 "None" {
// CHECK: %[[S0:.*]] = spirv.CompositeExtract %[[V]][0 : i32] : vector<3xf32>
// CHECK: %[[S1:.*]] = spirv.CompositeExtract %[[V]][1 : i32] : vector<3xf32>
// CHECK: %[[S2:.*]] = spirv.CompositeExtract %[[V]][2 : i32] : vector<3xf32>
// CHECK: %[[MIN0:.*]] = spirv.GL.FMin %[[S0]], %[[S1]] : f32
// CHECK: %[[MIN1:.*]] = spirv.GL.FMin %[[MIN0]], %[[S2]] : f32
// CHECK: %[[MIN2:.*]] = spirv.GL.FMin %[[MIN1]], %[[S]] : f32
// CHECK: spirv.ReturnValue %[[MIN2]] : f32
// CHECK: }
func.func @reduction_minnumf(%v : vector<3xf32>, %s: f32) -> f32 {
%reduce = vector.reduction <minnumf>, %v, %s : vector<3xf32> into f32
return %reduce : f32
}

// -----

// CHECK-LABEL: spirv.func @reduction_maxnumf(
// CHECK-SAME: %[[V:.*]]: vector<3xf32>,
// CHECK-SAME: %[[S:.*]]: f32) -> f32 "None" {
// CHECK: %[[S0:.*]] = spirv.CompositeExtract %[[V]][0 : i32] : vector<3xf32>
// CHECK: %[[S1:.*]] = spirv.CompositeExtract %[[V]][1 : i32] : vector<3xf32>
// CHECK: %[[S2:.*]] = spirv.CompositeExtract %[[V]][2 : i32] : vector<3xf32>
// CHECK: %[[MAX0:.*]] = spirv.GL.FMax %[[S0]], %[[S1]] : f32
// CHECK: %[[MAX1:.*]] = spirv.GL.FMax %[[MAX0]], %[[S2]] : f32
// CHECK: %[[MAX2:.*]] = spirv.GL.FMax %[[MAX1]], %[[S]] : f32
// CHECK: spirv.ReturnValue %[[MAX2]] : f32
// CHECK: }
func.func @reduction_maxnumf(%v : vector<3xf32>, %s: f32) -> f32 {
%reduce = vector.reduction <maxnumf>, %v, %s : vector<3xf32> into f32
return %reduce : f32
}

// -----

// CHECK-LABEL: func @reduction_maxsi
// CHECK-SAME: (%[[V:.+]]: vector<3xi32>, %[[S:.+]]: i32)
// CHECK: %[[S0:.+]] = spirv.CompositeExtract %[[V]][0 : i32] : vector<3xi32>
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100 changes: 100 additions & 0 deletions mlir/test/Dialect/Affine/SuperVectorize/vectorize_reduction.mlir
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Expand Up @@ -243,6 +243,106 @@ func.func @vecdim_reduction_ori(%in: memref<256x512xi32>, %out: memref<256xi32>)
// CHECK: affine.store %[[final_red]], %{{.*}} : memref<256xi32>
// CHECK: }

// -----

func.func @vecdim_reduction_xori(%in: memref<256x512xi32>, %out: memref<256xi32>) {
%cst = arith.constant 0 : i32
affine.for %i = 0 to 256 {
%final_red = affine.for %j = 0 to 512 iter_args(%red_iter = %cst) -> (i32) {
%ld = affine.load %in[%i, %j] : memref<256x512xi32>
%xor = arith.xori %red_iter, %ld : i32
affine.yield %xor : i32
}
affine.store %final_red, %out[%i] : memref<256xi32>
}
return
}

// CHECK-LABEL: func.func @vecdim_reduction_xori(
// CHECK-SAME: %[[input:.*]]: memref<256x512xi32>,
// CHECK-SAME: %[[output:.*]]: memref<256xi32>) {
// CHECK: %[[cst:.*]] = arith.constant 0 : i32
// CHECK: affine.for %{{.*}} = 0 to 256 {
// CHECK: %[[vzero:.*]] = arith.constant dense<0> : vector<128xi32>
// CHECK: %[[vred:.*]] = affine.for %{{.*}} = 0 to 512 step 128 iter_args(%[[red_iter:.*]] = %[[vzero]]) -> (vector<128xi32>) {
// CHECK: %[[poison:.*]] = ub.poison : i32
// CHECK: %[[ld:.*]] = vector.transfer_read %[[input]]{{\[}}%{{.*}}, %{{.*}}], %[[poison]] : memref<256x512xi32>, vector<128xi32>
// CHECK: %[[xor:.*]] = arith.xori %[[red_iter]], %[[ld]] : vector<128xi32>
// CHECK: affine.yield %[[xor]] : vector<128xi32>
// CHECK: }
// CHECK: %[[final_red:.*]] = vector.reduction <xor>, %[[vred]] : vector<128xi32> into i32
// CHECK: affine.store %[[final_red]], %[[output]]{{\[}}%{{.*}}] : memref<256xi32>
// CHECK: }
// CHECK: return
// CHECK: }

// -----

func.func @vecdim_reduction_minnumf(%in: memref<256x512xf32>, %out: memref<256xf32>) {
%cst = arith.constant 0xFF800000 : f32
affine.for %i = 0 to 256 {
%final_red = affine.for %j = 0 to 512 iter_args(%red_iter = %cst) -> (f32) {
%ld = affine.load %in[%i, %j] : memref<256x512xf32>
%min = arith.minnumf %red_iter, %ld : f32
affine.yield %min : f32
}
affine.store %final_red, %out[%i] : memref<256xf32>
}
return
}

// CHECK-LABEL: func.func @vecdim_reduction_minnumf(
// CHECK-SAME: %[[input:.*]]: memref<256x512xf32>,
// CHECK-SAME: %[[output:.*]]: memref<256xf32>) {
// CHECK: %[[cst:.*]] = arith.constant 0xFF800000 : f32
// CHECK: affine.for %{{.*}} = 0 to 256 {
// CHECK: %[[vzero:.*]] = arith.constant dense<0x7FC00000> : vector<128xf32>
// CHECK: %[[vred:.*]] = affine.for %{{.*}} = 0 to 512 step 128 iter_args(%[[red_iter:.*]] = %[[vzero]]) -> (vector<128xf32>) {
// CHECK: %[[poison:.*]] = ub.poison : f32
// CHECK: %[[ld:.*]] = vector.transfer_read %[[input]]{{\[}}%{{.*}}, %{{.*}}], %[[poison]] : memref<256x512xf32>, vector<128xf32>
// CHECK: %[[min:.*]] = arith.minnumf %[[red_iter]], %[[ld]] : vector<128xf32>
// CHECK: affine.yield %[[min]] : vector<128xf32>
// CHECK: }
// CHECK: %[[red_scalar:.*]] = vector.reduction <minnumf>, %[[vred]] : vector<128xf32> into f32
// CHECK: %[[final_red:.*]] = arith.minnumf %[[red_scalar]], %[[cst]] : f32
// CHECK: affine.store %[[final_red]], %[[output]]{{\[}}%{{.*}}] : memref<256xf32>
// CHECK: }
// CHECK: return
// CHECK: }

// -----

func.func @vecdim_reduction_maxnumf(%in: memref<256x512xf32>, %out: memref<256xf32>) {
%cst = arith.constant 0xFF800000 : f32
affine.for %i = 0 to 256 {
%final_red = affine.for %j = 0 to 512 iter_args(%red_iter = %cst) -> (f32) {
%ld = affine.load %in[%i, %j] : memref<256x512xf32>
%max = arith.maxnumf %red_iter, %ld : f32
affine.yield %max : f32
}
affine.store %final_red, %out[%i] : memref<256xf32>
}
return
}

// CHECK-LABEL: func.func @vecdim_reduction_maxnumf(
// CHECK-SAME: %[[input:.*]]: memref<256x512xf32>,
// CHECK-SAME: %[[output:.*]]: memref<256xf32>) {
// CHECK: %[[cst:.*]] = arith.constant 0xFF800000 : f32
// CHECK: affine.for %{{.*}} = 0 to 256 {
// CHECK: %[[vzero:.*]] = arith.constant dense<0xFFC00000> : vector<128xf32>
// CHECK: %[[vred:.*]] = affine.for %{{.*}} = 0 to 512 step 128 iter_args(%[[red_iter:.*]] = %[[vzero]]) -> (vector<128xf32>) {
// CHECK: %[[poison:.*]] = ub.poison : f32
// CHECK: %[[ld:.*]] = vector.transfer_read %[[input]]{{\[}}%{{.*}}, %{{.*}}], %[[poison]] : memref<256x512xf32>, vector<128xf32>
// CHECK: %[[max:.*]] = arith.maxnumf %[[red_iter]], %[[ld]] : vector<128xf32>
// CHECK: affine.yield %[[max]] : vector<128xf32>
// CHECK: }
// CHECK: %[[red_scalar:.*]] = vector.reduction <maxnumf>, %[[vred]] : vector<128xf32> into f32
// CHECK: %[[final_red:.*]] = arith.maxnumf %[[red_scalar]], %[[cst]] : f32
// CHECK: affine.store %[[final_red]], %[[output]]{{\[}}%{{.*}}] : memref<256xf32>
// CHECK: }
// CHECK: return
// CHECK: }

// -----

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