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Improved binary multiplication for large numbers

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Robin Stuart 2018-02-11 08:00:32 +00:00
parent f655eabc12
commit 8bb4d2ce86
6 changed files with 41 additions and 125 deletions
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20
backend/large.c
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@ -115,6 +115,26 @@ void binary_subtract(short int accumulator[], short int input_buffer[]) {
binary_add(accumulator, sub_buffer);
}
void binary_multiply(short int reg[], char data[]) {
/* Multiply the contents of reg[] by a number */
short int temp[112] = {0};
short int accum[112] = {0};
int i;
binary_load(temp, data, strlen(data));
for (i = 0; i < 102; i++) {
if (temp[i] == 1) {
binary_add(accum, reg);
}
shiftup(reg);
}
for (i = 0; i < 112; i++) {
reg[i] = accum[i];
}
}
void shiftdown(short int buffer[]) {
int i;