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merged 4 commits into from
Nov 12, 2024
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[mlir][vector][nfc] Add tests + update docs for narrow-type emulation #115460

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[mlir][vector][nfc] Add tests + update docs for narrow-type emulation
banach-space Nov 8, 2024
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fixup! [mlir][vector][nfc] Add tests + update docs for narrow-type em…
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fixup! fixup! [mlir][vector][nfc] Add tests + update docs for narrow-…
banach-space Nov 11, 2024
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fixup! fixup! fixup! [mlir][vector][nfc] Add tests + update docs for …
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47 changes: 33 additions & 14 deletions mlir/lib/Dialect/Vector/Transforms/VectorEmulateNarrowType.cpp
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Original file line number Diff line number Diff line change
@@ -1,11 +1,19 @@
//===- VectorEmulateNarrowType.cpp - Narrow type emulation ----*- C++
//-*-===//
//===- VectorEmulateNarrowType.cpp - Narrow type emulation ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements target-independent rewrites and utilities to emulate
// narrow types that are not supported by the target hardware, e.g. i4, using
// wider types, e.g. i8.
//
/// Currently, only power-of-two integer types are supported. These are
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@MaheshRavishankar MaheshRavishankar Nov 10, 2024

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Note that there is actually nothing fundamental about power of 2 here. It is an implementation detail and just NYI. Maybe might be better to make that clear.

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@hanhanW hanhanW Nov 11, 2024

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+1, perhaps we can explicitly say that the non-power-of-two types are not implemented yet in the description. It looks more clear for newcomers for the narrow type emulations.

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@banach-space banach-space Nov 12, 2024

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I will add a TODO at the top - clear indication for anyone brave enough to tackle this :)

/// converted to wider integers that are either 8 bits wide or wider.
//
//===----------------------------------------------------------------------===//

#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
Expand Down Expand Up @@ -315,23 +323,34 @@ struct ConvertVectorMaskedStore final
getValueOrCreateConstantIndexOp(rewriter, loc, linearizedIndicesOfr);

// Load the whole data and use arith.select to handle the corner cases.
// E.g., given these input values:
//
// %mask = [0, 1, 1, 1, 1, 1, 0, 0]
// %0[%c0, %c0] contains [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]
// %value_to_store = [0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x0]
// As an example, for this masked store of i4 values:
//
// vector.maskedstore %0[%c0, %c0], %mask, %val_to_store
//
// and given these input values:
//
// %mask = [0, 1, 1, 1, 1, 0, 0, 0] (8 * i1)
// %0[%c0, %c0] =
// [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8] (8 * i4)
// %val_to_store =
// [0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x0] (8 * i4)
//
// we'll have the following i4 output:
//
// we'll have
// expected output: [0x1, 0xA, 0xB, 0xC, 0xD, 0x6, 0x7, 0x8]
//
// expected output: [0x1, 0xA, 0xB, 0xC, 0xD, 0xE, 0x7, 0x8]
// Emulating the above using i8 will give:
//
// %new_mask = [1, 1, 1, 0]
// %maskedload = [0x12, 0x34, 0x56, 0x00]
// %bitcast = [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x0, 0x0]
// %select_using_shifted_mask = [0x1, 0xA, 0xB, 0xC, 0xD, 0xE, 0x0, 0x0]
// %packed_data = [0x1A, 0xBC, 0xDE, 0x00]
// %compressed_mask = [1, 1, 1, 0] (4 * i1)
// %maskedload = [0x12, 0x34, 0x56, 0x00] (4 * i8)
// %bitcast = [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x0, 0x0] (8 * i4)
// %select_using_shifted_mask =
// [0x1, 0xA, 0xB, 0xC, 0xD, 0x6, 0x0, 0x0] (8 * i4)
// %packed_data = [0x1A, 0xBC, 0xD6, 0x00] (4 * i8)
//
// Using the new mask to store %packed_data results in expected output.
// Using the compressed mask to store %packed_data results in expected
// output.
FailureOr<Operation *> newMask =
getCompressedMaskOp(rewriter, loc, op.getMask(), origElements, scale);
if (failed(newMask))
Expand Down
142 changes: 133 additions & 9 deletions mlir/test/Dialect/Vector/vector-emulate-narrow-type.mlir
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Original file line number Diff line number Diff line change
@@ -1,6 +1,10 @@
// RUN: mlir-opt --test-emulate-narrow-int="arith-compute-bitwidth=1 memref-load-bitwidth=8" --cse --split-input-file %s | FileCheck %s
// RUN: mlir-opt --test-emulate-narrow-int="arith-compute-bitwidth=1 memref-load-bitwidth=32" --cse --split-input-file %s | FileCheck %s --check-prefix=CHECK32

///----------------------------------------------------------------------------------------
/// vector.load
///----------------------------------------------------------------------------------------

func.func @vector_load_i8(%arg1: index, %arg2: index) -> vector<4xi8> {
%0 = memref.alloc() : memref<3x4xi8>
%1 = vector.load %0[%arg1, %arg2] : memref<3x4xi8>, vector<4xi8>
Expand Down Expand Up @@ -82,6 +86,10 @@ func.func @vector_load_i4_dynamic(%arg0 : index, %arg1 : index, %arg2 : index, %

// -----

///----------------------------------------------------------------------------------------
/// vector.transfer_read
///----------------------------------------------------------------------------------------

func.func @vector_transfer_read_i4(%arg1: index, %arg2: index) -> vector<8xi4> {
%c0 = arith.constant 0 : i4
%0 = memref.alloc() : memref<3x8xi4>
Expand Down Expand Up @@ -111,6 +119,10 @@ func.func @vector_transfer_read_i4(%arg1: index, %arg2: index) -> vector<8xi4> {

// -----

///----------------------------------------------------------------------------------------
/// vector.maskedload
///----------------------------------------------------------------------------------------

func.func @vector_maskedload_i8(%arg1: index, %arg2: index, %arg3: index, %passthru: vector<4xi8>) -> vector<4xi8> {
%0 = memref.alloc() : memref<3x4xi8>
%mask = vector.create_mask %arg3 : vector<4xi1>
Expand Down Expand Up @@ -190,15 +202,15 @@ func.func @vector_maskedload_i4(%arg1: index, %arg2: index, %arg3: index, %passt

// -----

func.func @vector_cst_maskedload_i8(%arg1: index, %arg2: index, %passthru: vector<4xi8>) -> vector<4xi8> {
func.func @vector_maskedload_i8_constant_mask(%arg1: index, %arg2: index, %passthru: vector<4xi8>) -> vector<4xi8> {
%0 = memref.alloc() : memref<3x4xi8>
%mask = vector.constant_mask [2] : vector<4xi1>
%1 = vector.maskedload %0[%arg1, %arg2], %mask, %passthru :
memref<3x4xi8>, vector<4xi1>, vector<4xi8> into vector<4xi8>
return %1 : vector<4xi8>
}
// Expect no conversions, i8 is supported.
// CHECK: func @vector_cst_maskedload_i8(
// CHECK: func @vector_maskedload_i8_constant_mask(
// CHECK-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index, %[[ARG1:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[ARG2:[a-zA-Z0-9]+]]: vector<4xi8>)
// CHECK-NEXT: %[[ALLOC:.+]] = memref.alloc() : memref<3x4xi8>
Expand All @@ -208,7 +220,7 @@ func.func @vector_cst_maskedload_i8(%arg1: index, %arg2: index, %passthru: vecto
// CHECK-NEXT: return

// CHECK32-DAG: #[[LOAD_IDX_MAP:.+]] = affine_map<()[s0, s1] -> (s0 + s1 floordiv 4)>
// CHECK32: func @vector_cst_maskedload_i8(
// CHECK32: func @vector_maskedload_i8_constant_mask(
// CHECK32-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index, %[[ARG1:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[ARG3:[a-zA-Z0-9]+]]: vector<4xi8>)
// CHECK32: %[[ALLOC:.+]] = memref.alloc() : memref<3xi32>
Expand All @@ -224,7 +236,7 @@ func.func @vector_cst_maskedload_i8(%arg1: index, %arg2: index, %passthru: vecto

// -----

func.func @vector_cst_maskedload_i4(%arg1: index, %arg2: index, %passthru: vector<8xi4>) -> vector<3x8xi4> {
func.func @vector_maskedload_i4_constant_mask(%arg1: index, %arg2: index, %passthru: vector<8xi4>) -> vector<3x8xi4> {
%0 = memref.alloc() : memref<3x8xi4>
%cst = arith.constant dense<0> : vector<3x8xi4>
%mask = vector.constant_mask [4] : vector<8xi1>
Expand All @@ -234,7 +246,7 @@ func.func @vector_cst_maskedload_i4(%arg1: index, %arg2: index, %passthru: vecto
return %2 : vector<3x8xi4>
}
// CHECK-DAG: #[[LOAD_IDX_MAP:.+]] = affine_map<()[s0, s1] -> (s0 * 4 + s1 floordiv 2)>
// CHECK: func @vector_cst_maskedload_i4(
// CHECK: func @vector_maskedload_i4_constant_mask(
// CHECK-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index, %[[ARG1:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[ARG2:[a-zA-Z0-9]+]]: vector<8xi4>)
// CHECK: %[[ALLOC:.+]] = memref.alloc() : memref<12xi8>
Expand All @@ -248,7 +260,7 @@ func.func @vector_cst_maskedload_i4(%arg1: index, %arg2: index, %passthru: vecto
// CHECK: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[BITCAST]], %[[ARG2]] : vector<8xi1>, vector<8xi4>

// CHECK32-DAG: #[[LOAD_IDX_MAP:.+]] = affine_map<()[s0, s1] -> (s0 + s1 floordiv 8)>
// CHECK32: func @vector_cst_maskedload_i4(
// CHECK32: func @vector_maskedload_i4_constant_mask(
// CHECK32-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index, %[[ARG1:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[ARG2:[a-zA-Z0-9]+]]: vector<8xi4>)
// CHECK32: %[[ALLOC:.+]] = memref.alloc() : memref<3xi32>
Expand All @@ -263,6 +275,10 @@ func.func @vector_cst_maskedload_i4(%arg1: index, %arg2: index, %passthru: vecto

// -----

///----------------------------------------------------------------------------------------
/// vector.extract -> vector.masked_load
///----------------------------------------------------------------------------------------

func.func @vector_extract_maskedload_i4(%arg1: index) -> vector<8x8x16xi4> {
%0 = memref.alloc() : memref<8x8x16xi4>
%c0 = arith.constant 0 : index
Expand Down Expand Up @@ -353,6 +369,10 @@ func.func @vector_extract_cst_maskedload_i4() -> vector<8x8x16xi4> {

// -----

///----------------------------------------------------------------------------------------
/// vector.store
///----------------------------------------------------------------------------------------

func.func @vector_store_i8(%arg0: vector<8xi8>, %arg1: index, %arg2: index) {
%0 = memref.alloc() : memref<4x8xi8>
vector.store %arg0, %0[%arg1, %arg2] :memref<4x8xi8>, vector<8xi8>
Expand Down Expand Up @@ -431,6 +451,10 @@ func.func @vector_store_i4_dynamic(%arg0: vector<8xi4>, %arg1: index, %arg2: ind

// -----

///----------------------------------------------------------------------------------------
/// vector.maskedstore
///----------------------------------------------------------------------------------------

func.func @vector_maskedstore_i8(%arg0: index, %arg1: index, %arg2: index, %value: vector<8xi8>) {
%0 = memref.alloc() : memref<3x8xi8>
%mask = vector.create_mask %arg2 : vector<8xi1>
Expand Down Expand Up @@ -469,14 +493,68 @@ func.func @vector_maskedstore_i8(%arg0: index, %arg1: index, %arg2: index, %valu

// -----

func.func @vector_cst_maskedstore_i8(%arg0: index, %arg1: index, %value: vector<8xi8>) {
func.func @vector_maskedstore_i4(
%idx1: index,
%idx2: index,
%num_elements_to_store: index,
%value: vector<8xi4>) {

%0 = memref.alloc() : memref<3x8xi4>
%mask = vector.create_mask %num_elements_to_store : vector<8xi1>
vector.maskedstore %0[%idx1, %idx2], %mask, %value :
memref<3x8xi4>, vector<8xi1>, vector<8xi4>
return
}
// CHECK: #[[$ATTR_10:.+]] = affine_map<()[s0, s1] -> (s0 * 4 + s1 floordiv 2)>
// CHECK: #[[$ATTR_11:.+]] = affine_map<()[s0] -> ((s0 + 1) floordiv 2)>

// CHECK-LABEL: func.func @vector_maskedstore_i4(
// CHECK-SAME: %[[IDX_1:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[IDX_2:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[NUM_EL_TO_STORE:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[VAL_TO_STORE:[a-zA-Z0-9]+]]: vector<8xi4>) {
// CHECK: %[[ALLOC:.+]] = memref.alloc() : memref<12xi8>
// CHECK: %[[ORIG_MASK:.+]] = vector.create_mask %[[NUM_EL_TO_STORE]] : vector<8xi1>
// CHECK: %[[LIDX:.+]] = affine.apply #[[$ATTR_10]](){{\[}}%[[IDX_1]], %[[IDX_2]]]
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@hanhanW hanhanW Nov 11, 2024

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nit: we don't need to escape [ because we do not capture % in variables. It is one of the pros of the trick, and it looks cleaner. Can you update it and fix other checks in the new lit tests?

Suggested change
// CHECK: %[[LIDX:.+]] = affine.apply #[[$ATTR_10]](){{\[}}%[[IDX_1]], %[[IDX_2]]]
// CHECK: %[[LIDX:.+]] = affine.apply #[[$ATTR_10]]()[%[[IDX_1]], %[[IDX_2]]]

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@banach-space banach-space Nov 12, 2024

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Oh, very nice, thanks for pointing this out 🙏🏻

// CHECK: %[[MASK_IDX:.+]] = affine.apply #[[$ATTR_11]](){{\[}}%[[NUM_EL_TO_STORE]]]
// CHECK: %[[NEW_MASK:.+]] = vector.create_mask %[[MASK_IDX]] : vector<4xi1>
// CHECK: %[[PASS_THRU:.+]] = arith.constant dense<0> : vector<4xi8>
// CHECK: %[[LOAD:.+]] = vector.maskedload %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[PASS_THRU]] : memref<12xi8>, vector<4xi1>, vector<4xi8> into vector<4xi8>
// CHECK: %[[BITCAST:.+]] = vector.bitcast %[[LOAD]] : vector<4xi8> to vector<8xi4>
// CHECK: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[VAL_TO_STORE]], %[[BITCAST]] : vector<8xi1>, vector<8xi4>
// CHECK: %[[NEW_VAL:.+]] = vector.bitcast %[[SELECT]] : vector<8xi4> to vector<4xi8>
// CHECK: vector.maskedstore %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[NEW_VAL]] : memref<12xi8>, vector<4xi1>, vector<4xi8>

// CHECK32: #[[$ATTR_17:.+]] = affine_map<()[s0, s1] -> (s0 + s1 floordiv 8)>
// CHECK32: #[[$ATTR_18:.+]] = affine_map<()[s0] -> ((s0 + 7) floordiv 8)>

// CHECK32-LABEL: func.func @vector_maskedstore_i4(
// CHECK32-SAME: %[[IDX_1:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[IDX_2:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[NUM_EL_TO_STORE:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[VAL_TO_STORE:[a-zA-Z0-9]+]]: vector<8xi4>) {
// CHECK32: %[[ALLOC:.+]] = memref.alloc() : memref<3xi32>
// CHECK32: %[[ORIG_MASK:.+]] = vector.create_mask %[[NUM_EL_TO_STORE]] : vector<8xi1>
// CHECK32: %[[LIDX:.+]] = affine.apply #[[$ATTR_17]](){{\[}}%[[IDX_1]], %[[IDX_2]]]
// CHECK32: %[[MASK_IDX:.+]] = affine.apply #[[$ATTR_18]](){{\[}}%[[NUM_EL_TO_STORE]]]
// CHECK32: %[[NEW_MASK:.+]] = vector.create_mask %[[MASK_IDX]] : vector<1xi1>
// CHECK32: %[[PASS_THRU:.+]] = arith.constant dense<0> : vector<1xi32>
// CHECK32: %[[LOAD:.+]] = vector.maskedload %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[PASS_THRU]] : memref<3xi32>, vector<1xi1>, vector<1xi32> into vector<1xi32>
// CHECK32: %[[BITCAST:.+]] = vector.bitcast %[[LOAD]] : vector<1xi32> to vector<8xi4>
// CHECK32: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[VAL_TO_STORE]], %[[BITCAST]] : vector<8xi1>, vector<8xi4>
// CHECK32: %[[NEW_VAL:.+]] = vector.bitcast %[[SELECT]] : vector<8xi4> to vector<1xi32>
// CHECK32: vector.maskedstore %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[NEW_VAL]] : memref<3xi32>, vector<1xi1>, vector<1xi32>

// -----

func.func @vector_maskedstore_i8_constant_mask(%arg0: index, %arg1: index, %value: vector<8xi8>) {
%0 = memref.alloc() : memref<3x8xi8>
%mask = vector.constant_mask [4] : vector<8xi1>
vector.maskedstore %0[%arg0, %arg1], %mask, %value : memref<3x8xi8>, vector<8xi1>, vector<8xi8>
return
}
// Expect no conversions, i8 is supported.
// CHECK: func @vector_cst_maskedstore_i8(
// CHECK: func @vector_maskedstore_i8_constant_mask(
// CHECK-SAME: %[[ARG0:[a-zA-Z0-9]+]]
// CHECK-SAME: %[[ARG1:[a-zA-Z0-9]+]]
// CHECK-SAME: %[[VAL:[a-zA-Z0-9]+]]
Expand All @@ -486,7 +564,7 @@ func.func @vector_cst_maskedstore_i8(%arg0: index, %arg1: index, %value: vector<
// CHECK-NEXT: return

// CHECK32-DAG: #[[LOAD_IDX_MAP:.+]] = affine_map<()[s0, s1] -> (s0 * 2 + s1 floordiv 4)>
// CHECK32: func @vector_cst_maskedstore_i8(
// CHECK32: func @vector_maskedstore_i8_constant_mask(
// CHECK32-SAME: %[[ARG0:[a-zA-Z0-9]+]]
// CHECK32-SAME: %[[ARG1:[a-zA-Z0-9]+]]
// CHECK32-SAME: %[[VAL:[a-zA-Z0-9]+]]
Expand All @@ -500,3 +578,49 @@ func.func @vector_cst_maskedstore_i8(%arg0: index, %arg1: index, %value: vector<
// CHECK32: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[VAL]], %[[BITCAST]] : vector<8xi1>, vector<8xi8>
// CHECK32: %[[NEW_VAL:.+]] = vector.bitcast %[[SELECT]] : vector<8xi8> to vector<2xi32>
// CHECK32: vector.maskedstore %[[ALLOC]][%[[LIDX]]], %[[NEW_MASK]], %[[NEW_VAL]]

// -----

func.func @vector_maskedstore_i4_constant_mask(
%idx_1: index,
%idx_2: index,
%val_to_store: vector<8xi4>) {

%0 = memref.alloc() : memref<3x8xi4>
%mask = vector.constant_mask [4] : vector<8xi1>
vector.maskedstore %0[%idx_1, %idx_2], %mask, %val_to_store :
memref<3x8xi4>, vector<8xi1>, vector<8xi4>
return
}

// CHECK: #[[$ATTR_12:.+]] = affine_map<()[s0, s1] -> (s0 * 4 + s1 floordiv 2)>
// CHECK-LABEL: func.func @vector_maskedstore_i4_constant_mask(
// CHECK-SAME: %[[IDX_1:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[IDX_2:[a-zA-Z0-9]+]]: index,
// CHECK-SAME: %[[VAL_TO_STORE:[a-zA-Z0-9]+]]: vector<8xi4>) {
// CHECK: %[[ALLOC:.+]] = memref.alloc() : memref<12xi8>
// CHECK: %[[ORIG_MASK:.+]] = vector.constant_mask [4] : vector<8xi1>
// CHECK: %[[LIDX:.+]] = affine.apply #[[$ATTR_12]](){{\[}}%[[IDX_1]], %[[IDX_2]]]
// CHECK: %[[NEW_MASK:.+]] = vector.constant_mask [2] : vector<4xi1>
// CHECK: %[[PASS_THRU:.+]] = arith.constant dense<0> : vector<4xi8>
// CHECK: %[[LOAD:.+]] = vector.maskedload %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[PASS_THRU]] : memref<12xi8>, vector<4xi1>, vector<4xi8> into vector<4xi8>
// CHECK: %[[BITCAST:.+]] = vector.bitcast %[[LOAD]] : vector<4xi8> to vector<8xi4>
// CHECK: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[VAL_TO_STORE]], %[[BITCAST]] : vector<8xi1>, vector<8xi4>
// CHECK: %[[NEW_VAL:.+]] = vector.bitcast %[[SELECT]] : vector<8xi4> to vector<4xi8>
// CHECK: vector.maskedstore %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[NEW_VAL]] : memref<12xi8>, vector<4xi1>, vector<4xi8>

// CHECK32: #[[$ATTR_20:.+]] = affine_map<()[s0, s1] -> (s0 + s1 floordiv 8)>
// CHECK32-LABEL: func.func @vector_maskedstore_i4_constant_mask(
// CHECK32-SAME: %[[IDX_1:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[IDX_2:[a-zA-Z0-9]+]]: index,
// CHECK32-SAME: %[[VAL_TO_STORE:[a-zA-Z0-9]+]]: vector<8xi4>) {
// CHECK32: %[[ALLOC:.+]] = memref.alloc() : memref<3xi32>
// CHECK32: %[[ORIG_MASK:.+]] = vector.constant_mask [4] : vector<8xi1>
// CHECK32: %[[LIDX:.+]] = affine.apply #[[$ATTR_20]](){{\[}}%[[IDX_1]], %[[IDX_2]]]
// CHECK32: %[[NEW_MASK:.+]] = vector.constant_mask [1] : vector<1xi1>
// CHECK32: %[[PASS_THRU:.+]] = arith.constant dense<0> : vector<1xi32>
// CHECK32: %[[LOAD:.+]] = vector.maskedload %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[PASS_THRU]] : memref<3xi32>, vector<1xi1>, vector<1xi32> into vector<1xi32>
// CHECK32: %[[BITCAST:.+]] = vector.bitcast %[[LOAD]] : vector<1xi32> to vector<8xi4>
// CHECK32: %[[SELECT:.+]] = arith.select %[[ORIG_MASK]], %[[VAL_TO_STORE]], %[[BITCAST]] : vector<8xi1>, vector<8xi4>
// CHECK32: %[[NEW_VAL:.+]] = vector.bitcast %[[SELECT]] : vector<8xi4> to vector<1xi32>
// CHECK32: vector.maskedstore %[[ALLOC]]{{\[}}%[[LIDX]]], %[[NEW_MASK]], %[[NEW_VAL]] : memref<3xi32>, vector<1xi1>, vector<1xi32>
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