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frontend: Relocate advanced SIMD expansion to a common file

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Deduplicates code a little bit.
This commit is contained in:
Lioncash 2020-05-22 19:00:56 -04:00 • committed by merry
parent fc112e61f2
commit 1900df5340
6 changed files with 70 additions and 107 deletions
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66
src/frontend/imm.cpp Normal file
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/* This file is part of the dynarmic project.
* Copyright (c) 2018 MerryMage
* SPDX-License-Identifier: 0BSD
*/
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/common_types.h"
#include "frontend/imm.h"
namespace Dynarmic {
u64 AdvSIMDExpandImm(bool op, Imm<4> cmode, Imm<8> imm8) {
switch (cmode.Bits<1, 3>()) {
case 0b000:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>(), 32);
case 0b001:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>() << 8, 32);
case 0b010:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>() << 16, 32);
case 0b011:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>() << 24, 32);
case 0b100:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>(), 16);
case 0b101:
return Common::Replicate<u64>(imm8.ZeroExtend<u64>() << 8, 16);
case 0b110:
if (!cmode.Bit<0>()) {
return Common::Replicate<u64>((imm8.ZeroExtend<u64>() << 8) | Common::Ones<u64>(8), 32);
}
return Common::Replicate<u64>((imm8.ZeroExtend<u64>() << 16) | Common::Ones<u64>(16), 32);
case 0b111:
if (!cmode.Bit<0>() && !op) {
return Common::Replicate<u64>(imm8.ZeroExtend<u64>(), 8);
}
if (!cmode.Bit<0>() && op) {
u64 result = 0;
result |= imm8.Bit<0>() ? Common::Ones<u64>(8) << (0 * 8) : 0;
result |= imm8.Bit<1>() ? Common::Ones<u64>(8) << (1 * 8) : 0;
result |= imm8.Bit<2>() ? Common::Ones<u64>(8) << (2 * 8) : 0;
result |= imm8.Bit<3>() ? Common::Ones<u64>(8) << (3 * 8) : 0;
result |= imm8.Bit<4>() ? Common::Ones<u64>(8) << (4 * 8) : 0;
result |= imm8.Bit<5>() ? Common::Ones<u64>(8) << (5 * 8) : 0;
result |= imm8.Bit<6>() ? Common::Ones<u64>(8) << (6 * 8) : 0;
result |= imm8.Bit<7>() ? Common::Ones<u64>(8) << (7 * 8) : 0;
return result;
}
if (cmode.Bit<0>() && !op) {
u64 result = 0;
result |= imm8.Bit<7>() ? 0x80000000 : 0;
result |= imm8.Bit<6>() ? 0x3E000000 : 0x40000000;
result |= imm8.Bits<0, 5, u64>() << 19;
return Common::Replicate<u64>(result, 32);
}
if (cmode.Bit<0>() && op) {
u64 result = 0;
result |= imm8.Bit<7>() ? 0x80000000'00000000 : 0;
result |= imm8.Bit<6>() ? 0x3FC00000'00000000 : 0x40000000'00000000;
result |= imm8.Bits<0, 5, u64>() << 48;
return result;
}
}
UNREACHABLE();
}
} // namespace Dynarmic