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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
//===- OptimizeArrayRepacking.cpp -----------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
/// \file
/// This pass removes redundant fir.pack_array operations, if it can prove
/// that the source array is contiguous. In this case, it relink all uses
/// of fir.pack_array result to the source. If such a rewrite happens,
/// it may turn the using fir.unpack_array operation into one with the same
/// temp and original operands - these are also removed as redundant.
//===----------------------------------------------------------------------===//
#include "flang/Optimizer/Builder/HLFIRTools.h"
#include "flang/Optimizer/Dialect/FIRDialect.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/Support/Utils.h"
#include "flang/Optimizer/Transforms/Passes.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
namespace fir {
#define GEN_PASS_DEF_OPTIMIZEARRAYREPACKING
#include "flang/Optimizer/Transforms/Passes.h.inc"
} // namespace fir
namespace {
class OptimizeArrayRepackingPass
: public fir::impl::OptimizeArrayRepackingBase<OptimizeArrayRepackingPass> {
public:
void runOnOperation() override;
};
/// Relinks all uses of redundant fir.pack_array to the source.
class PackingOfContiguous : public mlir::OpRewritePattern<fir::PackArrayOp> {
public:
using OpRewritePattern::OpRewritePattern;
mlir::LogicalResult matchAndRewrite(fir::PackArrayOp,
mlir::PatternRewriter &) const override;
};
/// Erases fir.unpack_array with have the matching temp and original
/// operands.
class NoopUnpacking : public mlir::OpRewritePattern<fir::UnpackArrayOp> {
public:
using OpRewritePattern::OpRewritePattern;
mlir::LogicalResult matchAndRewrite(fir::UnpackArrayOp,
mlir::PatternRewriter &) const override;
};
} // namespace
mlir::LogicalResult
PackingOfContiguous::matchAndRewrite(fir::PackArrayOp op,
mlir::PatternRewriter &rewriter) const {
mlir::Value box = op.getArray();
if (hlfir::isSimplyContiguous(box, !op.getInnermost())) {
rewriter.replaceAllUsesWith(op, box);
rewriter.eraseOp(op);
return mlir::success();
}
return mlir::failure();
}
mlir::LogicalResult
NoopUnpacking::matchAndRewrite(fir::UnpackArrayOp op,
mlir::PatternRewriter &rewriter) const {
if (op.getTemp() == op.getOriginal()) {
rewriter.eraseOp(op);
return mlir::success();
}
return mlir::failure();
}
void OptimizeArrayRepackingPass::runOnOperation() {
mlir::func::FuncOp funcOp = getOperation();
mlir::MLIRContext *context = &getContext();
mlir::RewritePatternSet patterns(context);
mlir::GreedyRewriteConfig config;
config.setRegionSimplificationLevel(
mlir::GreedySimplifyRegionLevel::Disabled);
patterns.insert<PackingOfContiguous>(context);
patterns.insert<NoopUnpacking>(context);
if (mlir::failed(
mlir::applyPatternsGreedily(funcOp, std::move(patterns), config))) {
mlir::emitError(funcOp.getLoc(), "failure in array repacking optimization");
signalPassFailure();
}
}
|
