1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef BERBERIS_INTRINSICS_GUEST_RISCV64_FPSTATE_H_ 18 #define BERBERIS_INTRINSICS_GUEST_RISCV64_FPSTATE_H_ 19 20 #include <cfenv> 21 #include <cstdint> 22 23 namespace berberis { 24 25 namespace FPFlags { 26 27 inline constexpr uint64_t NV = 1 << 4; 28 inline constexpr uint64_t DZ = 1 << 3; 29 inline constexpr uint64_t OF = 1 << 2; 30 inline constexpr uint64_t UF = 1 << 1; 31 inline constexpr uint64_t NX = 1 << 0; 32 inline constexpr uint64_t RM_POS = 5; 33 inline constexpr uint64_t RM_MASK = 0b111; 34 inline constexpr uint64_t RM_MAX = 0b100; 35 inline constexpr uint64_t RNE = 0b000; 36 inline constexpr uint64_t RTZ = 0b001; 37 inline constexpr uint64_t RDN = 0b010; 38 inline constexpr uint64_t RUP = 0b011; 39 inline constexpr uint64_t RMM = 0b100; 40 inline constexpr uint64_t DYN = 0b111; 41 42 } // namespace FPFlags 43 44 namespace intrinsics { 45 46 // Note that not all RISC-V rounding modes are supported on popular architectures. 47 // FE_TIESAWAY is emulated, but proper emulation needs FE_TOWARDZERO mode. ToHostRoundingMode(int8_t rm)48inline int ToHostRoundingMode(int8_t rm) { 49 static constexpr int kRounding[FPFlags::RM_MAX + 1] = { 50 FE_TONEAREST, FE_TOWARDZERO, FE_DOWNWARD, FE_UPWARD, FE_TOWARDZERO}; 51 return kRounding[rm]; 52 } 53 54 } // namespace intrinsics 55 56 } // namespace berberis 57 58 #endif // BERBERIS_INTRINSICS_GUEST_RISCV64_FPSTATE_H_ 59