65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef BERBERIS_FP_REGS_H_
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#define BERBERIS_FP_REGS_H_
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#include <cstring>
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#include "berberis/base/bit_util.h"
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#include "berberis/intrinsics/intrinsics_float.h"
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namespace berberis {
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template <typename FloatType>
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inline FloatType NanUnboxFPRegToFloat(uint64_t arg);
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template <>
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inline intrinsics::Float32 NanUnboxFPRegToFloat(uint64_t arg) {
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// Apart from transfer operations (e.g. loads and stores), all other floating-point operations on
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// narrower n-bit operations, n < FLEN, check if the input operands are correctly NaN-boxed, i.e.,
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// all upper FLEN−n bits are 1. If so, the n least-significant bits of the input are used as the
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// input value, otherwise the input value is treated as an n-bit canonical NaN.
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if ((arg & 0xffff'ffff'0000'0000) != 0xffff'ffff'0000'0000) {
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return bit_cast<intrinsics::Float32>(0x7fc00000);
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}
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intrinsics::Float32 result;
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memcpy(&result, &arg, sizeof(intrinsics::Float32));
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return result;
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}
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template <>
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inline intrinsics::Float64 NanUnboxFPRegToFloat(uint64_t arg) {
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return bit_cast<intrinsics::Float64>(arg);
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}
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template <typename FloatType>
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inline uint64_t NanBoxFloatToFPReg(FloatType arg);
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template <>
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inline uint64_t NanBoxFloatToFPReg(intrinsics::Float32 arg) {
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return bit_cast<uint32_t>(arg) | 0xffff'ffff'0000'0000;
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}
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template <>
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inline uint64_t NanBoxFloatToFPReg(intrinsics::Float64 arg) {
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return bit_cast<uint64_t>(arg);
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}
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} // namespace berberis
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#endif // BERBERIS_FP_REGS_H_
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