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Improved binary multiplication for large numbers

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This commit is contained in:
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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65
backend/imail.c
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@ -316,17 +316,8 @@ int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
for (read = 0; read < strlen(zip); read++) {
for (i = 0; i < 112; i++) {
x_reg[i] = accum[i];
}
for (i = 0; i < 9; i++) {
binary_add(accum, x_reg);
}
for (i = 0; i < 112; i++) {
x_reg[i] = 0;
}
binary_multiply(accum, "10");
binary_load(x_reg, "0", 1);
for (i = 0; i < 4; i++) {
if (ctoi(zip[read]) & (0x01 << i)) x_reg[i] = 1;
@ -361,17 +352,8 @@ int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
for (read = 0; read < strlen(zip_adder); read++) {
for (i = 0; i < 112; i++) {
y_reg[i] = accum[i];
}
for (i = 0; i < 9; i++) {
binary_add(accum, y_reg);
}
for (i = 0; i < 112; i++) {
y_reg[i] = 0;
}
binary_multiply(accum, "10");
binary_load(y_reg, "0", 1);
for (i = 0; i < 4; i++) {
if (ctoi(zip_adder[read]) & (0x01 << i)) y_reg[i] = 1;
@ -385,17 +367,8 @@ int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
/* tracking code */
/* multiply by 10 */
for (i = 0; i < 112; i++) {
y_reg[i] = accum[i];
}
for (i = 0; i < 9; i++) {
binary_add(accum, y_reg);
}
for (i = 0; i < 112; i++) {
y_reg[i] = 0;
}
binary_multiply(accum, "10");
binary_load(y_reg, "0", 1);
/* add first digit of tracker */
for (i = 0; i < 4; i++) {
@ -405,17 +378,8 @@ int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
binary_add(accum, y_reg);
/* multiply by 5 */
for (i = 0; i < 112; i++) {
y_reg[i] = accum[i];
}
for (i = 0; i < 4; i++) {
binary_add(accum, y_reg);
}
for (i = 0; i < 112; i++) {
y_reg[i] = 0;
}
binary_multiply(accum, "5");
binary_load(y_reg, "0", 1);
/* add second digit */
for (i = 0; i < 4; i++) {
@ -428,17 +392,8 @@ int imail(struct zint_symbol *symbol, unsigned char source[], int length) {
for (read = 2; read < strlen(tracker); read++) {
for (i = 0; i < 112; i++) {
y_reg[i] = accum[i];
}
for (i = 0; i < 9; i++) {
binary_add(accum, y_reg);
}
for (i = 0; i < 112; i++) {
y_reg[i] = 0;
}
binary_multiply(accum, "10");
binary_load(y_reg, "0", 1);
for (i = 0; i < 4; i++) {
if (ctoi(tracker[read]) & (0x01 << i)) y_reg[i] = 1;