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// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_COMPILER_TURBOSHAFT_TAG_UNTAG_LOWERING_REDUCER_H_
#define V8_COMPILER_TURBOSHAFT_TAG_UNTAG_LOWERING_REDUCER_H_
#include "src/compiler/turboshaft/assembler.h"
#include "src/compiler/turboshaft/graph.h"
#include "src/compiler/turboshaft/operations.h"
#include "src/compiler/turboshaft/representations.h"
namespace v8::internal::compiler::turboshaft {
#include "src/compiler/turboshaft/define-assembler-macros.inc"
template <class Next>
class TagUntagLoweringReducer : public Next {
static constexpr int kSmiShiftBits = kSmiShiftSize + kSmiTagSize;
public:
TURBOSHAFT_REDUCER_BOILERPLATE()
template <class... Args>
explicit TagUntagLoweringReducer(const std::tuple<Args...>& args)
: Next(args) {}
OpIndex ReduceTag(OpIndex input, TagKind kind) {
DCHECK_EQ(kind, TagKind::kSmiTag);
// Do shift on 32bit values if Smis are stored in the lower word.
if constexpr (Is64() && SmiValuesAre31Bits()) {
return ChangeTaggedInt32ToSmi(__ Word32ShiftLeft(input, kSmiShiftBits));
} else {
return V<Tagged>::Cast(
__ WordPtrShiftLeft(__ ChangeInt32ToIntPtr(input), kSmiShiftBits));
}
}
OpIndex ReduceUntag(OpIndex input, TagKind kind, RegisterRepresentation rep) {
DCHECK_EQ(kind, TagKind::kSmiTag);
DCHECK_EQ(rep, RegisterRepresentation::Word32());
if constexpr (Is64() && SmiValuesAre31Bits()) {
return __ Word32ShiftRightArithmeticShiftOutZeros(input, kSmiShiftBits);
}
return V<Word32>::Cast(
__ WordPtrShiftRightArithmeticShiftOutZeros(input, kSmiShiftBits));
}
private:
V<Tagged> ChangeTaggedInt32ToSmi(V<Word32> input) {
DCHECK(SmiValuesAre31Bits());
// In pointer compression, we smi-corrupt. Then, the upper bits are not
// important.
return COMPRESS_POINTERS_BOOL
? V<Tagged>::Cast(__ BitcastWord32ToWord64(input))
: V<Tagged>::Cast(__ ChangeInt32ToIntPtr(input));
}
};
#include "src/compiler/turboshaft/undef-assembler-macros.inc"
} // namespace v8::internal::compiler::turboshaft
#endif // V8_COMPILER_TURBOSHAFT_TAG_UNTAG_LOWERING_REDUCER_H_
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