TestLoopUnrolling.cpp
2.13 KB
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
67
68
//===-------- TestLoopUnrolling.cpp --- loop unrolling test pass ----------===//
//
// 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 unroll loops by a specified unroll factor.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/SCF/SCF.h"
#include "mlir/IR/Builders.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/LoopUtils.h"
#include "mlir/Transforms/Passes.h"
using namespace mlir;
namespace {
static unsigned getNestingDepth(Operation *op) {
Operation *currOp = op;
unsigned depth = 0;
while ((currOp = currOp->getParentOp())) {
if (isa<scf::ForOp>(currOp))
depth++;
}
return depth;
}
class TestLoopUnrollingPass
: public PassWrapper<TestLoopUnrollingPass, FunctionPass> {
public:
TestLoopUnrollingPass() = default;
TestLoopUnrollingPass(const TestLoopUnrollingPass &) {}
explicit TestLoopUnrollingPass(uint64_t unrollFactorParam,
unsigned loopDepthParam) {
unrollFactor = unrollFactorParam;
loopDepth = loopDepthParam;
}
void runOnFunction() override {
FuncOp func = getFunction();
SmallVector<scf::ForOp, 4> loops;
func.walk([&](scf::ForOp forOp) {
if (getNestingDepth(forOp) == loopDepth)
loops.push_back(forOp);
});
for (auto loop : loops) {
loopUnrollByFactor(loop, unrollFactor);
}
}
Option<uint64_t> unrollFactor{*this, "unroll-factor",
llvm::cl::desc("Loop unroll factor."),
llvm::cl::init(1)};
Option<unsigned> loopDepth{*this, "loop-depth", llvm::cl::desc("Loop depth."),
llvm::cl::init(0)};
};
} // end namespace
namespace mlir {
void registerTestLoopUnrollingPass() {
PassRegistration<TestLoopUnrollingPass>(
"test-loop-unrolling", "Tests loop unrolling transformation");
}
} // namespace mlir