1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
//===- TestAffineLoopUnswitching.cpp - Test affine if/else hoisting -------===//
//
// 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 a pass to hoist affine if/else structures.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Affine/Analysis/Utils.h"
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Affine/Utils.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/Passes.h"
#define PASS_NAME "test-affine-loop-unswitch"
using namespace mlir;
using namespace mlir::affine;
namespace {
/// This pass applies the permutation on the first maximal perfect nest.
struct TestAffineLoopUnswitching
: public PassWrapper<TestAffineLoopUnswitching, OperationPass<>> {
MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestAffineLoopUnswitching)
StringRef getArgument() const final { return PASS_NAME; }
StringRef getDescription() const final {
return "Tests affine loop unswitching / if/else hoisting";
}
TestAffineLoopUnswitching() = default;
TestAffineLoopUnswitching(const TestAffineLoopUnswitching &pass) = default;
void runOnOperation() override;
/// The maximum number of iterations to run this for.
constexpr static unsigned kMaxIterations = 5;
};
} // namespace
void TestAffineLoopUnswitching::runOnOperation() {
// Each hoisting invalidates a lot of IR around. Just stop the walk after the
// first if/else hoisting, and repeat until no more hoisting can be done, or
// the maximum number of iterations have been run.
Operation *op = getOperation();
unsigned i = 0;
do {
auto walkFn = [](AffineIfOp op) {
return succeeded(hoistAffineIfOp(op)) ? WalkResult::interrupt()
: WalkResult::advance();
};
if (op->walk(walkFn).wasInterrupted())
break;
} while (++i < kMaxIterations);
}
namespace mlir {
void registerTestAffineLoopUnswitchingPass() {
PassRegistration<TestAffineLoopUnswitching>();
}
} // namespace mlir
|
