54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* SPDX-License-Identifier: 0BSD
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*/
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#pragma once
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#include "common/common_types.h"
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#include "common/bit_util.h"
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namespace Dynarmic::Backend::X64::NZCV {
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constexpr u32 arm_mask = 0xF000'0000;
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constexpr u32 x64_mask = 0xC101;
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constexpr size_t x64_n_flag_bit = 15;
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constexpr size_t x64_z_flag_bit = 14;
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constexpr size_t x64_c_flag_bit = 8;
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constexpr size_t x64_v_flag_bit = 0;
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/// This is a constant used to create the x64 flags format from the ARM format.
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/// NZCV * multiplier: NZCV0NZCV000NZCV
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/// x64_flags format: NZ-----C-------V
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constexpr u32 to_x64_multiplier = 0x1081;
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/// This is a constant used to create the ARM format from the x64 flags format.
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constexpr u32 from_x64_multiplier = 0x1021'0000;
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inline u32 ToX64(u32 nzcv) {
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/* Naive implementation:
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u32 x64_flags = 0;
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x64_flags |= Common::Bit<31>(cpsr) ? 1 << 15 : 0;
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x64_flags |= Common::Bit<30>(cpsr) ? 1 << 14 : 0;
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x64_flags |= Common::Bit<29>(cpsr) ? 1 << 8 : 0;
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x64_flags |= Common::Bit<28>(cpsr) ? 1 : 0;
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return x64_flags;
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*/
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return ((nzcv >> 28) * to_x64_multiplier) & x64_mask;
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}
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inline u32 FromX64(u32 x64_flags) {
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/* Naive implementation:
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u32 nzcv = 0;
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nzcv |= Common::Bit<15>(x64_flags) ? 1 << 31 : 0;
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nzcv |= Common::Bit<14>(x64_flags) ? 1 << 30 : 0;
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nzcv |= Common::Bit<8>(x64_flags) ? 1 << 29 : 0;
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nzcv |= Common::Bit<0>(x64_flags) ? 1 << 28 : 0;
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return nzcv;
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*/
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return ((x64_flags & x64_mask) * from_x64_multiplier) & arm_mask;
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}
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} // namespace Dynarmic::Backend::X64::NZCV
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