perfaware/part1: Merge add, sub, cmp case
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5ae2cc3a56
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119
part1/sim8086.c
119
part1/sim8086.c
@ -815,10 +815,10 @@ S86_Opcode S86_DecodeOpcode(S86_BufferIterator *buffer_it,
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}
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typedef struct S86_MnemonicOpToRegisterFileMap {
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S86_MnemonicOp mnemonic_op; ///< Register/op that the mnemonic is using
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S86_MnemonicOp mnemonic_op_reg16; ///< 16 bit register for the mnemonic op
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S86_Register16 *reg; ///< Pointer to the register memory this mnemonic op is using
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S86_RegisterByte byte; ///< The 'byte' that the mnemonic operates on (hi, lo or nil e.g. word)
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S86_MnemonicOp mnemonic_op; ///< Register/op that the mnemonic is using
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S86_MnemonicOp mnemonic_op_reg16; ///< 16 bit register for the mnemonic op
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S86_Register16 *reg; ///< Pointer to the register memory this mnemonic op is using
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S86_RegisterByte byte; ///< The 'byte' that the mnemonic operates on (hi, lo or nil e.g. word)
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} S86_MnemonicOpToRegisterFileMap;
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#define PRINT_USAGE S86_PrintLn(S86_STR8("usage: sim8086.exe [--exec] <binary asm file>"))
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@ -1329,105 +1329,28 @@ int main(int argc, char **argv)
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S86_PrintFmt(" ; %.*s:0x%x->0x%x ", S86_STR8_FMT(dest_reg16), prev_dest, dest_map->reg->word);
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} break;
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case S86_Mnemonic_ADD: {
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S86_MnemonicOpToRegisterFileMap const *dest_map = NULL;
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for (size_t index = 0; !dest_map && index < S86_ARRAY_UCOUNT(mnemonic_op_to_register_file_map); index++) {
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S86_MnemonicOpToRegisterFileMap const *item = mnemonic_op_to_register_file_map + index;
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if (item->mnemonic_op == opcode.dest)
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dest_map = item;
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}
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S86_ASSERT(dest_map);
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uint16_t prev_dest = dest_map->reg->word;
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bool byte_op = opcode.dest >= S86_MnemonicOp_AL && opcode.dest <= S86_MnemonicOp_BH;
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if (opcode.src == S86_MnemonicOp_Immediate) {
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if (byte_op) {
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S86_ASSERT(opcode.immediate < S86_CAST(uint8_t)-1);
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dest_map->reg->bytes[dest_map->byte] += S86_CAST(uint8_t)opcode.immediate;
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} else {
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S86_ASSERT(opcode.immediate < S86_CAST(uint16_t)-1);
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dest_map->reg->word += S86_CAST(uint16_t)opcode.immediate;
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}
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} else {
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S86_MnemonicOpToRegisterFileMap const *src_map = NULL;
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for (size_t index = 0; !src_map && index < S86_ARRAY_UCOUNT(mnemonic_op_to_register_file_map); index++) {
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S86_MnemonicOpToRegisterFileMap const *item = mnemonic_op_to_register_file_map + index;
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if (item->mnemonic_op == opcode.src)
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src_map = item;
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}
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if (byte_op)
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dest_map->reg->bytes[dest_map->byte] += src_map->reg->bytes[src_map->byte];
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else
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dest_map->reg->word += src_map->reg->word;
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}
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S86_Str8 dest_reg16 = S86_MnemonicOpStr8(dest_map->mnemonic_op_reg16);
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register_file.sign_flag = dest_map->reg->word & (byte_op ? 0b0000'0000'1000'0000 : 0b1000'0000'0000'0000);
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S86_PrintFmt(" ; %.*s:0x%x->0x%x ", S86_STR8_FMT(dest_reg16), prev_dest, dest_map->reg->word);
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} break;
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case S86_Mnemonic_SUB: {
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S86_MnemonicOpToRegisterFileMap const *dest_map = NULL;
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for (size_t index = 0; !dest_map && index < S86_ARRAY_UCOUNT(mnemonic_op_to_register_file_map); index++) {
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S86_MnemonicOpToRegisterFileMap const *item = mnemonic_op_to_register_file_map + index;
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if (item->mnemonic_op == opcode.dest)
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dest_map = item;
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}
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S86_ASSERT(dest_map);
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uint16_t prev_dest = dest_map->reg->word;
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bool byte_op = opcode.dest >= S86_MnemonicOp_AL && opcode.dest <= S86_MnemonicOp_BH;
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if (opcode.src == S86_MnemonicOp_Immediate) {
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if (byte_op) {
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S86_ASSERT(opcode.immediate < S86_CAST(uint8_t)-1);
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dest_map->reg->bytes[dest_map->byte] -= S86_CAST(uint8_t)opcode.immediate;
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} else {
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S86_ASSERT(opcode.immediate < S86_CAST(uint16_t)-1);
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dest_map->reg->word -= S86_CAST(uint16_t)opcode.immediate;
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}
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} else {
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S86_MnemonicOpToRegisterFileMap const *src_map = NULL;
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for (size_t index = 0; !src_map && index < S86_ARRAY_UCOUNT(mnemonic_op_to_register_file_map); index++) {
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S86_MnemonicOpToRegisterFileMap const *item = mnemonic_op_to_register_file_map + index;
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if (item->mnemonic_op == opcode.src)
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src_map = item;
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}
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if (byte_op)
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dest_map->reg->bytes[dest_map->byte] -= src_map->reg->bytes[src_map->byte];
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else
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dest_map->reg->word -= src_map->reg->word;
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}
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S86_Str8 dest_reg16 = S86_MnemonicOpStr8(dest_map->mnemonic_op_reg16);
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register_file.zero_flag = byte_op ? dest_map->reg->bytes[dest_map->byte] == 0 : dest_map->reg->word == 0;
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register_file.sign_flag = dest_map->reg->word & (byte_op ? 0b0000'0000'1000'0000 : 0b1000'0000'0000'0000);
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S86_PrintFmt(" ; %.*s:0x%x->0x%x ", S86_STR8_FMT(dest_reg16), prev_dest, dest_map->reg->word);
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} break;
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case S86_Mnemonic_ADD: /*FALLTHRU*/
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case S86_Mnemonic_SUB: /*FALLTHRU*/
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case S86_Mnemonic_CMP: {
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S86_MnemonicOpToRegisterFileMap const *dest_map = NULL;
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S86_MnemonicOpToRegisterFileMap *dest_map = NULL;
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for (size_t index = 0; !dest_map && index < S86_ARRAY_UCOUNT(mnemonic_op_to_register_file_map); index++) {
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S86_MnemonicOpToRegisterFileMap const *item = mnemonic_op_to_register_file_map + index;
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S86_MnemonicOpToRegisterFileMap *item = mnemonic_op_to_register_file_map + index;
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if (item->mnemonic_op == opcode.dest)
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dest_map = item;
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}
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S86_ASSERT(dest_map);
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S86_Register16 dest_copy = *dest_map->reg;
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S86_Register16 *dest = &dest_copy;
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bool byte_op = opcode.dest >= S86_MnemonicOp_AL && opcode.dest <= S86_MnemonicOp_BH;
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uint16_t sign = opcode.mnemonic == S86_Mnemonic_ADD ? 1 : -1;
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S86_Register16 dest = *dest_map->reg;
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uint16_t prev_dest16 = dest.word;
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bool byte_op = opcode.dest >= S86_MnemonicOp_AL && opcode.dest <= S86_MnemonicOp_BH;
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if (opcode.src == S86_MnemonicOp_Immediate) {
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if (byte_op) {
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S86_ASSERT(opcode.immediate < S86_CAST(uint8_t)-1);
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dest->bytes[dest_map->byte] -= S86_CAST(uint8_t)opcode.immediate;
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dest.bytes[dest_map->byte] += S86_CAST(uint8_t)(opcode.immediate * sign);
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} else {
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S86_ASSERT(opcode.immediate < S86_CAST(uint16_t)-1);
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dest->word -= S86_CAST(uint16_t)opcode.immediate;
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dest.word += S86_CAST(uint16_t)(opcode.immediate * sign);
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}
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} else {
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S86_MnemonicOpToRegisterFileMap const *src_map = NULL;
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@ -1438,13 +1361,21 @@ int main(int argc, char **argv)
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}
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if (byte_op)
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dest->bytes[dest_map->byte] -= src_map->reg->bytes[src_map->byte];
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dest.bytes[dest_map->byte] += S86_CAST(uint8_t)(src_map->reg->bytes[src_map->byte] * sign);
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else
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dest->word -= src_map->reg->word;
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dest.word += S86_CAST(uint16_t)(src_map->reg->word * sign);
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}
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S86_Str8 dest_reg16 = S86_MnemonicOpStr8(dest_map->mnemonic_op_reg16);
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register_file.sign_flag = dest_map->reg->word & (byte_op ? 0b0000'0000'1000'0000 : 0b1000'0000'0000'0000);
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S86_PrintFmt(" ; ");
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if (opcode.mnemonic == S86_Mnemonic_CMP) {
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S86_PrintFmt(" ; ");
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} else {
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if (opcode.mnemonic == S86_Mnemonic_SUB)
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register_file.zero_flag = byte_op ? dest.bytes[dest_map->byte] == 0 : dest.word == 0;
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S86_PrintFmt(" ; %.*s:0x%x->0x%x ", S86_STR8_FMT(dest_reg16), prev_dest16, dest.word);
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*dest_map->reg = dest;
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}
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} break;
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}
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