bedohswe/bootsector_tictactoe
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Some optimizations.

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bʰedoh₂ swé 2025-05-25 16:59:44 +05:00
parent b569aa3984
commit e1e670abdf
1 changed files with 6 additions and 12 deletions
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18
boot.c
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@ -8,7 +8,7 @@ typedef enum : char {
NOT = 'O' NOT = 'O'
} Cell; } Cell;
Cell* board = ((Cell*)0x7F00); Cell* const board = (Cell*)0x7F00;
HEDLEY_ALWAYS_INLINE char readchar(void); HEDLEY_ALWAYS_INLINE char readchar(void);
HEDLEY_ALWAYS_INLINE bool checkwin(Cell c); HEDLEY_ALWAYS_INLINE bool checkwin(Cell c);
@ -24,9 +24,8 @@ void _start(void) {
"start:\n" "start:\n"
); );
Cell cur = CROSS; Cell cur = CROSS;
for (char i = 0; i < 3; i++) for (unsigned char i = 0; i < 9; i++)
for (char j = 0; j < 3; j++) board[i] = NONE;
board[i * 3 + j] = NONE;
while (1) { while (1) {
printboard(); printboard();
char k = readchar(); char k = readchar();
@ -45,10 +44,7 @@ void _start(void) {
board[c] = cur; board[c] = cur;
if (checkwin(cur)) if (checkwin(cur))
break; break;
if (cur == CROSS) cur ^= (CROSS ^ NOT);
cur = NOT;
else
cur = CROSS;
} }
putchar(cur); putchar(cur);
printboard(); printboard();
@ -83,10 +79,8 @@ void printboard(void) {
HEDLEY_ALWAYS_INLINE HEDLEY_ALWAYS_INLINE
bool checkwin(Cell c) { bool checkwin(Cell c) {
for (size_t i = 0; i <= 2; i++) for (size_t i = 0; i <= 2; i++)
if ((board[i] == c) && (board[i + 3] == c) && (board[i + 6] == c)) if (((board[i] == c) && (board[i + 3] == c) && (board[i + 6] == c)) &&
return true; ((board[3*i] == c) && (board[3*i + 1] == c) && (board[3*i + 2] == c)))
for (size_t i = 0; i <= 2; i++)
if ((board[3*i] == c) && (board[3*i + 1] == c) && (board[3*i + 2] == c))
return true; return true;
if (board[0] == c && board[4] == c && board[8] == c) if (board[0] == c && board[4] == c && board[8] == c)
return true; return true;