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improved calculation of rom_size from code as per review comment

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This commit is contained in:
joeldipops 2019-11-04 21:34:58 +10:00
parent 47fa885d13
commit cbfbe5018c
1 changed files with 2 additions and 14 deletions
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16
si/gb.c
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@ -20,19 +20,6 @@ static const uint16_t EXTRAM_SIZE_CODE_ADDRESS = 0x0149;
void cart_reset_mbc(struct controller *controller);
void cart_default_cleanup();
static uintmax_t power(unsigned x, unsigned y) {
uintmax_t z = 1;
uintmax_t base = x;
while (y) {
if (y & 1) { // or y%2
z *= base;
}
y >>= 1; // or y /= 2
base *= base;
}
return z;
}
static uint8_t mbc_read_ff( struct controller *controller, uint16_t address )
{
return 0xff;
@ -612,7 +599,8 @@ void gb_init(struct controller *controller) {
uint8_t rom_size_code = cart->cartrom_bank_zero[ROM_SIZE_CODE_ADDRESS];
if (rom_size_code <= 8) {
cart->cartrom_num_banks = power(2, rom_size_code + 1);
// powers of 2
cart->cartrom_num_banks = 1 << (rom_size_code + 1);
} else {
switch(rom_size_code) {
case 0x52: