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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
//===- CharacterConversion.cpp -- convert between character encodings -----===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "flang/Optimizer/Dialect/FIRDialect.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "flang/Optimizer/Dialect/Support/FIRContext.h"
#include "flang/Optimizer/Dialect/Support/KindMapping.h"
#include "flang/Optimizer/Transforms/Passes.h"
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/Diagnostics.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/DialectConversion.h"
#include "llvm/Support/Debug.h"
namespace fir {
#define GEN_PASS_DEF_CHARACTERCONVERSION
#include "flang/Optimizer/Transforms/Passes.h.inc"
} // namespace fir
#define DEBUG_TYPE "flang-character-conversion"
namespace {
// TODO: Future hook to select some set of runtime calls.
struct CharacterConversionOptions {
std::string runtimeName;
};
class CharacterConvertConversion
: public mlir::OpRewritePattern<fir::CharConvertOp> {
public:
using OpRewritePattern::OpRewritePattern;
mlir::LogicalResult
matchAndRewrite(fir::CharConvertOp conv,
mlir::PatternRewriter &rewriter) const override {
auto kindMap = fir::getKindMapping(conv->getParentOfType<mlir::ModuleOp>());
auto loc = conv.getLoc();
LLVM_DEBUG(llvm::dbgs()
<< "running character conversion on " << conv << '\n');
// Establish a loop that executes count iterations.
auto zero = rewriter.create<mlir::arith::ConstantIndexOp>(loc, 0);
auto one = rewriter.create<mlir::arith::ConstantIndexOp>(loc, 1);
auto idxTy = rewriter.getIndexType();
auto castCnt = rewriter.create<fir::ConvertOp>(loc, idxTy, conv.getCount());
auto countm1 = rewriter.create<mlir::arith::SubIOp>(loc, castCnt, one);
auto loop = rewriter.create<fir::DoLoopOp>(loc, zero, countm1, one);
auto insPt = rewriter.saveInsertionPoint();
rewriter.setInsertionPointToStart(loop.getBody());
// For each code point in the `from` string, convert naively to the `to`
// string code point. Conversion is done blindly on size only, not value.
auto getCharBits = [&](mlir::Type t) {
auto chrTy = fir::unwrapSequenceType(fir::dyn_cast_ptrEleTy(t))
.cast<fir::CharacterType>();
return kindMap.getCharacterBitsize(chrTy.getFKind());
};
auto fromBits = getCharBits(conv.getFrom().getType());
auto toBits = getCharBits(conv.getTo().getType());
auto pointerType = [&](unsigned bits) {
return fir::ReferenceType::get(fir::SequenceType::get(
fir::SequenceType::ShapeRef{fir::SequenceType::getUnknownExtent()},
rewriter.getIntegerType(bits)));
};
auto fromPtrTy = pointerType(fromBits);
auto toTy = rewriter.getIntegerType(toBits);
auto toPtrTy = pointerType(toBits);
auto fromPtr =
rewriter.create<fir::ConvertOp>(loc, fromPtrTy, conv.getFrom());
auto toPtr = rewriter.create<fir::ConvertOp>(loc, toPtrTy, conv.getTo());
auto getEleTy = [&](unsigned bits) {
return fir::ReferenceType::get(rewriter.getIntegerType(bits));
};
auto fromi = rewriter.create<fir::CoordinateOp>(
loc, getEleTy(fromBits), fromPtr,
mlir::ValueRange{loop.getInductionVar()});
auto toi = rewriter.create<fir::CoordinateOp>(
loc, getEleTy(toBits), toPtr, mlir::ValueRange{loop.getInductionVar()});
auto load = rewriter.create<fir::LoadOp>(loc, fromi);
mlir::Value icast =
(fromBits >= toBits)
? rewriter.create<fir::ConvertOp>(loc, toTy, load).getResult()
: rewriter.create<mlir::arith::ExtUIOp>(loc, toTy, load)
.getResult();
rewriter.replaceOpWithNewOp<fir::StoreOp>(conv, icast, toi);
rewriter.restoreInsertionPoint(insPt);
return mlir::success();
}
};
/// Rewrite the `fir.char_convert` op into a loop. This pass must be run only on
/// fir::CharConvertOp.
class CharacterConversion
: public fir::impl::CharacterConversionBase<CharacterConversion> {
public:
void runOnOperation() override {
CharacterConversionOptions clOpts{useRuntimeCalls.getValue()};
if (clOpts.runtimeName.empty()) {
auto *context = &getContext();
auto *func = getOperation();
mlir::RewritePatternSet patterns(context);
patterns.insert<CharacterConvertConversion>(context);
mlir::ConversionTarget target(*context);
target.addLegalDialect<mlir::affine::AffineDialect, fir::FIROpsDialect,
mlir::arith::ArithDialect,
mlir::func::FuncDialect>();
// apply the patterns
target.addIllegalOp<fir::CharConvertOp>();
if (mlir::failed(mlir::applyPartialConversion(func, target,
std::move(patterns)))) {
mlir::emitError(mlir::UnknownLoc::get(context),
"error in rewriting character convert op");
signalPassFailure();
}
return;
}
// TODO: some sort of runtime supported conversion?
signalPassFailure();
}
};
} // end anonymous namespace
std::unique_ptr<mlir::Pass> fir::createCharacterConversionPass() {
return std::make_unique<CharacterConversion>();
}
|
